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Journal articles on the topic 'Positional accuracy assessment'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Gu, Jianyu, and Russell G. Congalton. "Analysis of the Impact of Positional Accuracy When Using a Block of Pixels for Thematic Accuracy Assessment." Geographies 1, no. 2 (2021): 143–65. http://dx.doi.org/10.3390/geographies1020009.

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Pixels, blocks (i.e., grouping of pixels), and polygons are the fundamental choices for use as assessment units for validating per-pixel image classification. Previous research conducted by the authors of this paper focused on the analysis of the impact of positional accuracy when using a single pixel for thematic accuracy assessment. The research described here provided a similar analysis, but the blocks of contiguous pixels were chosen as the assessment unit for thematic validation. The goal of this analysis was to assess the impact of positional errors on the thematic assessment. Factors in

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Gu, Jianyu, and Russell G. Congalton. "Analysis of the Impact of Positional Accuracy When Using a Single Pixel for Thematic Accuracy Assessment." Remote Sensing 12, no. 24 (2020): 4093. http://dx.doi.org/10.3390/rs12244093.

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The primary goal of thematic accuracy assessment is to measure the quality of land cover products and it has become an essential component in global or regional land cover mapping. However, there are many uncertainties introduced in the validation process which could propagate into the derived accuracy measures and therefore impact the decisions made with these maps. Choosing the appropriate reference data sample unit is one of the most important decisions in this process. The majority of researchers have used a single pixel as the assessment unit for thematic accuracy assessment, while others

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Farah, Ashraf, and Dafer Algarni. "Positional Accuracy Assessment of Googleearth in Riyadh." Artificial Satellites 49, no. 2 (2014): 101–6. http://dx.doi.org/10.2478/arsa-2014-0008.

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ABSTRACT Google Earth is a virtual globe, map and geographical information program that is controlled by Google corporation. It maps the Earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS 3D globe. With millions of users all around the globe, GoogleEarth® has become the ultimate source of spatial data and information for private and public decision-support systems besides many types and forms of social interactions. Many users mostly in developing countries are also using it for surveying applications, the matter that raises questions about the p

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Ruiz-Lendínez, Juan J., Manuel A. Ureña-Cámara, José L. Mesa-Mingorance, and Francisco J. Quesada-Real. "Automatic Positional Accuracy Assessment of Imagery Segmentation Processes: A Case Study." ISPRS International Journal of Geo-information 10, no. 7 (2021): 430. https://doi.org/10.3390/ijgi10070430.

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There are many studies related to Imagery Segmentation (IS) in the field of Geographic Information (GI). However, none of them address the assessment of IS results from a positional perspective. In a field in which the positional aspect is critical, it seems reasonable to think that the quality associated with this aspect must be controlled. This paper presents an automatic positional accuracy assessment (PAA) method for assessing this quality component of the regions obtained by means of the application of a textural segmentation algorithm to a Very High Resolution (VHR) aerial image. This me

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Ruiz-Lendínez, Juan J., Manuel A. Ureña-Cámara, José L. Mesa-Mingorance, and Francisco J. Quesada-Real. "Automatic Positional Accuracy Assessment of Imagery Segmentation Processes: A Case Study." ISPRS International Journal of Geo-Information 10, no. 7 (2021): 430. http://dx.doi.org/10.3390/ijgi10070430.

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There are many studies related to Imagery Segmentation (IS) in the field of Geographic Information (GI). However, none of them address the assessment of IS results from a positional perspective. In a field in which the positional aspect is critical, it seems reasonable to think that the quality associated with this aspect must be controlled. This paper presents an automatic positional accuracy assessment (PAA) method for assessing this quality component of the regions obtained by means of the application of a textural segmentation algorithm to a Very High Resolution (VHR) aerial image. This me

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Ariza López, Francisco Javier, and Alan David Atkinson Gordo. "Analysis of Some Positional Accuracy Assessment Methodologies." Journal of Surveying Engineering 134, no. 2 (2008): 45–54. http://dx.doi.org/10.1061/(asce)0733-9453(2008)134:2(45).

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Xavier, E. M. A., F. J. Ariza-López, and M. A. Ureña-Cámara. "WEB SERVICE FOR POSITIONAL QUALITY ASSESSMENT: THE WPS TIER." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-3/W5 (August 20, 2015): 257–62. http://dx.doi.org/10.5194/isprsannals-ii-3-w5-257-2015.

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In the field of spatial data every day we have more and more information available, but we still have little or very little information about the quality of spatial data. We consider that the automation of the spatial data quality assessment is a true need for the geomatic sector, and that automation is possible by means of web processing services (WPS), and the application of specific assessment procedures. In this paper we propose and develop a WPS tier centered on the automation of the positional quality assessment. An experiment using the NSSDA positional accuracy method is presented. The

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8

Boye, Cynthia Borkai. "Positional Accuracy Assessment for Effective Shoreline Change Analyses." Ghana Mining Journal 16, no. 1 (2016): 1. http://dx.doi.org/10.4314/gm.v16i1.1.

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Boye, Cynthia Borkai. "Positional Accuracy Assessment for Effective Shoreline Change Analyses." Ghana Mining Journal 16, no. 1 (2016): 1. http://dx.doi.org/10.4314/gmj.v16i1.1.

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Garcia, H. H., M. E. Mercurio, D. P. Noveloso, and R. B. Reyes. "POSITIONAL ACCURACY ASSESSMENT USING SINGLE AND MULTI-GNSS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4/W19 (December 23, 2019): 223–27. http://dx.doi.org/10.5194/isprs-archives-xlii-4-w19-223-2019.

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Abstract. Global Navigation Satellite System (GNSS) provides users worldwide with a three-dimensional positioning, velocity and time solution 24-hour service using transmitted radio signals from orbiting satellites in space. Dependency on the number of satellites available during observation can improve satellite geometry and increase redundancy which be a factor for the quality of GNSS positioning result. Each position derived from different combinations of satellite systems were evaluated aside from using GPS only. The test is conducted by single and relative positioning method using survey

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11

NIWA, Hideyuki. "Assessment of horizontal positional accuracy using UAV imagery." Ecology and Civil Engineering 19, no. 1 (2016): 47–53. http://dx.doi.org/10.3825/ece.19.47.

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Gu, Jianyu, and Russell G. Congalton. "The Positional Effect in Soft Classification Accuracy Assessment." American Journal of Remote Sensing 7, no. 2 (2019): 50. http://dx.doi.org/10.11648/j.ajrs.20190702.13.

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13

Rodríguez-Avi, José, and Francisco Javier Ariza-López. "Finite Mixture Models in the Evaluation of Positional Accuracy of Geospatial Data." Remote Sensing 14, no. 9 (2022): 2062. http://dx.doi.org/10.3390/rs14092062.

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Digital elevation models (DEMs) are highly relevant geospatial products, and their positional accuracy has demonstrated influence on elevation derivatives (e.g., slope, aspect, curvature, etc.) and GIS results (e.g., drainage network and watershed delineation, etc.). The accuracy assessment of the DEMs is usually based on analyzing the altimetric component by means of positional accuracy assessment methods that are based on the use of a normal distribution for error modeling but, unfortunately, the observed distribution of the altimetric errors is not always normal. This paper proposes the app

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Rodríguez-Avi, José, and Francisco Javier Ariza-López. "Finite Mixture Models in the Evaluation of Positional Accuracy of Geospatial Data." Remote Sensing 14, no. 9 (2022): 2062. http://dx.doi.org/10.3390/rs14092062.

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Digital elevation models (DEMs) are highly relevant geospatial products, and their positional accuracy has demonstrated influence on elevation derivatives (e.g., slope, aspect, curvature, etc.) and GIS results (e.g., drainage network and watershed delineation, etc.). The accuracy assessment of the DEMs is usually based on analyzing the altimetric component by means of positional accuracy assessment methods that are based on the use of a normal distribution for error modeling but, unfortunately, the observed distribution of the altimetric errors is not always normal. This paper proposes the app

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15

Sohn, Hong-Gyoo, and Kee-Tae Kim. "Horizontal positional accuracy assessment of historical ARGON satellite photography." KSCE Journal of Civil Engineering 4, no. 1 (2000): 59–65. http://dx.doi.org/10.1007/bf02829175.

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Dhruwa, L., and P. K. Garg. "POSITIONAL ACCURACY ASSESSMENT OF FEATURES USING LIDAR POINT CLOUD." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-M-3-2023 (September 5, 2023): 77–80. http://dx.doi.org/10.5194/isprs-archives-xlviii-m-3-2023-77-2023.

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Abstract. Nowadays, Light Detection and Ranging (LiDAR) data acquisition technology is gaining popularity due to its accuracy, precision, and rapid data collection. In recent years, many applications have demanded 3-D models and 3-D mapping for fly-through views of cities. LiDAR data is used to map topographic features as well as the height and density of high-rise objects, such as trees and buildings, on the earth's surface. Although there are numerous traditional surveying and space-based technologies existing to determine the elevation or height of any object are time-consuming, inaccurate,

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Victor, Ayodele Ijaware, Ugochukwu Nzelibe Ifechukwu, and Deji David Micheal. "Accuracy Assessment of Derived Ortho-photo Using Drone-Based Survey." Journal of Environmental Engineering and its Scope 8, no. 2 (2025): 10–28. https://doi.org/10.5281/zenodo.15525589.

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<em>The increasing use of Unmanned Aerial Vehicles (UAVs) equipped with Real-Time Kinematic (RTK) Global Navigation Satellite Systems (GNSS) for generating orthophotos has highlighted the need for comprehensive accuracy assessments. This study assesses the accuracy of orthophotos derived using RTK survey drones and compares them with other remote sensing sources. The research focuses on a selected area of Federal University of Technology Akure (FUTA) in Ondo State, Nigeria, and employs a high-resolution RTK-enabled drone, DJI Phantom 4 RTK, to capture images with optimal image overlap. Ground

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Šakan, Davor, Serdjo Kos, Biserka Drascic Ban, and David Brčić. "On Linear and Circular Approach to GPS Data Processing: Analyses of the Horizontal Positioning Deviations Based on the Adriatic Region IGS Observables." Data 6, no. 2 (2021): 9. http://dx.doi.org/10.3390/data6020009.

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Global and regional positional accuracy assessment is of the highest importance for any satellite navigation system, including the Global Positioning System (GPS). Although positioning error can be expressed as a vector quantity with direction and magnitude, most of the research focuses on error magnitude only. The positional accuracy can be evaluated in terms of navigational quadrants as further refinement of error distribution, as it was shown here. This research was conducted in the wider area of the Northern Adriatic Region, employing the International Global Navigation Satellite Systems (

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Yeneneh, Mihret, Gizachew Addis, and Teha Benti. "Assessment of Ground Control Points Positional Shift and Management Practices: Evidences from Assosa Town, Western Ethiopia." American Journal of Science, Engineering and Technology 9, no. 3 (2024): 163–74. http://dx.doi.org/10.11648/j.ajset.20240903.12.

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This study assesses the positional shift of existing control points and management practices found in and around Assosa town. The static GPS measurement technique was used as an independent source and a point wise method were used to assess the positional shift and accuracy level evaluation. Due to unavailability of local CORS station, two first order GCPs were used as a reference during static GPS measurement. After measurement was conducted depending on the baseline length between control point marks, the STC desktop software and online CSRS-PPP post processing technique was used. Thus, the

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Chudá, J., R. Kadlečík, M. Mokroš, T. Mikita, J. Tuček, and F. Chudý. "SLAM AND INS BASED POSITIONAL ACCURACY ASSESSMENT OF NATURAL AND ARTIFICIAL OBJECTS UNDER THE FOREST CANOPY." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2022 (May 30, 2022): 197–205. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2022-197-2022.

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Abstract. The positional accuracy derived from the outputs of carried integrated devices was evaluated in this study. For data collection, the inertial navigation system (INS) SPAN NovAtel and a handheld mobile laser scanner GeoSLAM ZEB Horizon which uses simultaneous localization and mapping technology (SLAM) were utilized for data collection. The accuracy was assessed on the set of reference objects located under the forest canopy, which were measured via a traditional field survey (the methods of geodesy). In the results of this study the high potential of the devices and the application of

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Skopeliti, Andriani, and Savvas Vasileiadis. "OSM positional accuracy assessment and visualization for different user needs." Abstracts of the ICA 7 (September 3, 2024): 1–2. http://dx.doi.org/10.5194/ica-abs-7-152-2024.

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22

Jasem, Mervat S., and Odey AL-Hamadani. "Positional Accuracy Assessment for Updating Authoritative Geospatial Datasets Based on Open Source Data and Remotely Sensed Images." Journal of Engineering 26, no. 2 (2020): 70–84. http://dx.doi.org/10.31026/j.eng.2020.02.06.

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OpenStreetMap (OSM) represents the most common example of online volunteered mapping applications. Most of these platforms are open source spatial data collected by non-experts volunteers using different data collection methods. OSM project aims to provide a free digital map for all the world. The heterogeneity in data collection methods made OSM project databases accuracy is unreliable and must be dealt with caution for any engineering application. This study aims to assess the horizontal positional accuracy of three spatial data sources are OSM road network database, high-resolution Satellit

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23

Harja, Herman Budi, Anisa Nurbaniah, Novi Saksono Brodjo Muhadi, and Andi Noviandi. "Straightness Geometric Error Assessment for CNC Milling Machine." Key Engineering Materials 939 (January 25, 2023): 39–46. http://dx.doi.org/10.4028/p-a8n75m.

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The straightness movement error of the machine tools axis contributes significantly to the straightness of the workpiece machining feature. This paper focuses on the assessment study of CNC machine tools’ straightness geometric error for obtaining recommendation information to improve machine geometric accuracy. A research method by determining measurement parameters according to ISO 230 procedure, no-load measurement of straightness vertical-horizontal geometric error using a laser interferometer, collecting data, data analysis. Data analysis calculates positional straightness deviation, mean

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Ruiz-Lendínez, Juan José, Francisco Javier Ariza-López, and Manuel Antonio Ureña-Cámara. "Study of NSSDA Variability by Means of Automatic Positional Accuracy Assessment Methods." ISPRS International Journal of Geo-Information 8, no. 12 (2019): 552. http://dx.doi.org/10.3390/ijgi8120552.

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Point-based standard methodologies (PBSM) suggest using ‘at least 20’ check points in order to assess the positional accuracy of a certain spatial dataset. However, the reason for decreasing the number of checkpoints to 20 is not elaborated upon in the original documents provided by the mapping agencies which develop these methodologies. By means of theoretical analysis and experimental tests, several authors and studies have demonstrated that this limited number of points is clearly insufficient. Using the point-based methodology for the automatic positional accuracy assessment of spatial dat

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Mantey, S., and M. S. Aduah. "Assessment of positional accuracies of UAV-based coordinates derived from orthophotos at varying times of the day- A case study." South African Journal of Geomatics 10, no. 1 (2022): 46–59. http://dx.doi.org/10.4314/sajg.v10i1.4.

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Positional accuracy is one of the important factors which determines acceptability of survey work. Apart from the equipment and method used which affect the accuracy of surveys, time of the day in which the equipment operates can equally affect the accuracy of a survey. In this study, the performance of Unmanned Aerial Vehicle (UAV) surveys as well as the appropriate time in the day to apply the technology in Tarkwa, Ghana, has been investigated. The paper assessed the positional accuracies of ground features on UAV-based orthophotos (with emphasis on horizontal coordinates), captured at diffe

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Ruiz-Lendínez, J. J., F. J. Ariza-López, and M. A. Ureña-Cámara. "Automatic positional accuracy assessment of geospatial databases using line-based methods." Survey Review 45, no. 332 (2013): 332–42. http://dx.doi.org/10.1179/1752270613y.0000000044.

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S. O, Oladosu, and Ehigiator-Irughe R. "ASSESSMENT OF 3D POSITIONAL ACCURACY OF GEODETIC OBSERVATIONS FROM SINGLE CORS." Geological Behavior 6, no. 2 (2022): 101–6. http://dx.doi.org/10.26480/gbr.02.2022.101.106.

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Geodetic observations for both vertical and horizontal control networks cannot be compromised for any reason in accuracy and precision in the field of geomatics. Due to the error-prone nature of survey measurements, standards are established to allow for comparing the obtained results with a set of guidelines, regulations, or pre-determined specifications. The University of Benin’s Ugbowo Campus in Nigeria does not have enough control points, which informs this study. The densification of more reliable control points using the most recent technology is necessary. Before the observations, contr

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Albakri, Maythm, and Duaa Salman Hussien. "Evaluating the Quality of Authoritative Geospatial Datasets." Journal of Engineering 23, no. 11 (2017): 113–29. http://dx.doi.org/10.31026/j.eng.2017.11.09.

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General Directorate of Surveying is considered one of the most important sources of maps in Iraq. It produced digital maps for whole Iraq in the last six years. These maps are produced from different data sources with unknown accuracy; therefore, the quality of these maps needs to be assessed. The main aim of this study is to evaluate the positional accuracy of digital maps that produced from General Directorate of Surveying. Two different study areas were selected: AL-Rusafa and AL-Karkh in Baghdad / Iraq with an area of 172.826 and 135.106 square kilometers, respectively. Different statistic

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Barrera, Domingo, María José Ibáñez, Salah Eddargani, Rocio Romero, Francisco J. Ariza-López, and Juan F. Reinoso-Gordo. "Horizontal accuracy assessment of a novel algorithm for approximate a surface to a DEM." Proceedings of the ICA 4 (December 3, 2021): 1–5. http://dx.doi.org/10.5194/ica-proc-4-11-2021.

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Abstract. This study evaluates the horizontal positional accuracy of a new algorithm that defines a surface that approximates DEM data by means of a spline function. This algorithm allows evaluating the surface at any point in its definition domain and allows analytically estimating other parameters of interest, such as slopes, orientations, etc. To evaluate the accuracy achieved with the algorithm, we use a reference DEM 2 m × 2 m (DEMref) from which the derived DEMs are obtained at 4 m × 4 m, 8 m × 8 m and 16 m × 16 m (DEMder). For each DEMder its spline approximant is calculated, which is e

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Kim, Minsu, Seonkyung Park, Jeffrey Irwin, et al. "Positional Accuracy Assessment of Lidar Point Cloud from NAIP/3DEP Pilot Project." Remote Sensing 12, no. 12 (2020): 1974. http://dx.doi.org/10.3390/rs12121974.

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The Leica Geosystems CountryMapper hybrid system has the potential to collect data that satisfy the U.S. Geological Survey (USGS) National Geospatial Program (NGP) and 3D Elevation Program (3DEP) and the U.S. Department of Agriculture (USDA) National Agriculture Imagery Program (NAIP) requirements in a single collection. This research will help 3DEP determine if this sensor has the potential to meet current and future 3DEP topographic lidar collection requirements. We performed an accuracy analysis and assessment on the lidar point cloud produced from CountryMapper. The boresighting calibratio

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Mozas-Calvache, Antonio Tomás. "Positional quality assessment based on linear elements." Revista Cartográfica, no. 103 (June 13, 2021): 11–31. http://dx.doi.org/10.35424/rcarto.i103.911.

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This study describes the current state of the art related to the assessment of the positional accuracy of spatial databases based on lines. The use of this type of element of spatial databases has increased in recent years because of the current possibilities of acquisition and sharing data of routes, roads, etc. Nowadays, users are also contributors and this supposes that the spatial quality of data acquired and shared by non-experts must be assessed as is the case with data produced by institutions and enterprises. In this context, several methods based on lines have been developed up to thi

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Liu, Zizhuo, Chengming Luo, Hongxuan Fan, Zicheng Dou, and Han Xu. "Modeling of underwater vehicle positioning accuracy assessment based on ultrashort baseline." Journal of Physics: Conference Series 2996, no. 1 (2025): 012016. https://doi.org/10.1088/1742-6596/2996/1/012016.

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Abstract Considering the effects of complexity and uncertainty in underwater environments, solving the lower bound of the underwater vehicle positioning error variance is crucial for assessing positioning accuracy. To address the problem of nonlinear measurement equations for underwater acoustic sensors with ultrashort baseline measurements of underwater vehicles, this paper designs a method for recursively deriving an improved posterior Cramer-Rao lower bound for underwater vehicles using Taylor expansion linearization and then conducts simulation experiments. The results show that the improv

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Gil de la Vega, P., F. J. Ariza-López, and A. T. Mozas-Calvache. "Models for positional accuracy assessment of linear features: 2D and 3D cases." Survey Review 48, no. 350 (2016): 347–60. http://dx.doi.org/10.1080/00396265.2015.1113027.

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Ayodele, E. G., C. J. Okolie, and O. A. Mayaki. "An Assessment of the Reliability of the NIGNET Data." March 2019 3, no. 1 (2019): 18–29. http://dx.doi.org/10.36263/nijest.2019.01.0097.

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The Nigerian Geodetic Reference Frame is defined by a number of Continuously Operating Reference Stations (CORS) that constitute the Nigerian GNSS Network (NIGNET). NIGNET is essential for planning and national development with the main goal of ensuring consistency in the geodetic framework both nationally and internationally. Currently, the strength of the network in terms of data reliability has not been adequately studied due to the fact that research into CORS in Nigeria is just evolving, which constitutes a limitation in its applications. Therefore, the aim of this research is to explore

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Jaafar, Hasan Abdulhussein, and Jareer Mohammed. "ASSESSING THE POSITIONAL ACCURACY OF RAW GNSS DATA FROM ANDROID DEVICES." Kufa Journal of Engineering 15, no. 3 (2024): 82–106. http://dx.doi.org/10.30572/2018/kje/150306.

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Smartphone devices have become the focus of attention of scholars dealing with GNSS measurements since May 2016 when Google stated using Android operating system version N that can access GNSS raw data. This opened the research door wide to process this data and analyse different issues in positioning by smartphones. Our study contributes to the assessment of GNSS data accuracy by evaluating various Android Application Programs (APPS) using Samsung Galaxy S9PLUS smartphone. While previous research has explored this topic, our study distinguishes itself through a comprehensive comparison of thr

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Emmanuel, Chigozie Dike* Bright Godfrey Ameme Evangeline Nkiruka Le-ol Anthony. "Comparative Analysis of Multi-Spectral Shoreline Delineation Using Landsat-8, Sentinel-2, and PlanetScope Imageries in Coastal Environments of Nigeria." International Journal of Scientific Research and Technology 2, no. 2 (2025): 159–74. https://doi.org/10.5281/zenodo.14907334.

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Changes in the shoreline position are a result of climate change-induced sea level rise and morphological changes caused by coastal processes. The delineation of shoreline positions relies on robust techniques and data sources, with remote sensing being particularly advantageous due to its cost-effectiveness and technological advancements. The study focuses on the eastern Niger Delta region of Nigeria, utilising mid-resolution multispectral datasets from Landsat-8 OLI, Sentinel-2 MSI, and PlanetScope to compare shoreline positions derived from different water indices (NDVI and NDWI) and classi

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Kattan, Raad A., and Farsat H. Abdulrahman. "Accuracy Assessment of Duhok City Land use Official Maps." Polytechnic Journal 9, no. 2 (2019): 178–85. http://dx.doi.org/10.25156/ptj.v9n2y2019.pp178-185.

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In this study, the geometric accuracy of four different maps for three sectors of Duhok city was assessed. The maps were produced in different periods and different techniques. One set of maps was paper plotted maps, which had to be geo-referenced. The other three maps were digitally plotted with reference to the global coordinate system UTM/WGS-84/Zone 38 N projection. A total of 51 points were identified on one reference map, which is the master plan of Duhok city prepared by the general directorate of urban planning/Kurdistan region/Iraq with the collaboration of the German company Ingenieu

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Kovalevich, M., T. Neypert, and P. Davydov. "Calculation of accuracy with the coordinate-positional method of basing." Journal of Physics: Conference Series 2131, no. 3 (2021): 032005. http://dx.doi.org/10.1088/1742-6596/2131/3/032005.

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Abstract The article is devoted to the assessment of assembly accuracy when positioning with the use of industrial manipulators (robots). Classic assembly technologies are outdated and have many disadvantages that can be solved by the automation of industrial processes, which became possible due to the rapid development of robotization. In the material there are investigation the possibility of using industrial robots for positioning structural elements of aircraft from the point of view of achieving the required assembly accuracy. For the analysis, foreign literature sources and the current e

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Statella, Thiago. "Geometric quality assessment of CBERS-4 MUXCAM image." Revista Brasileira de Geomática 4, no. 2 (2016): 116. http://dx.doi.org/10.3895/rbgeo.v4n2.5498.

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In December 2014, Brazil and China successfully launched the CBERS-4 satellite, the fourth generation of CBERS satellites. In the payload module, the satellite carries the MUXCAM, a 20 m/pixel spatial resolution multispectral camera. The MUXCAM was built by Brazil and it is an improvement of the CCD camera on board CBERS-1, 2 and 2B satellites. In this paper the geometric quality of the MUXCAM images is analyzed. One can measure the geometric quality of the CCD sensor by calculating the positioning and the internal accuracy of the images acquired by it. The positional accuracy for the MUXCAM r

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Rebernik, Teja, Jidde Jacobi, Mark Tiede, and Martijn Wieling. "Accuracy Assessment of Two Electromagnetic Articulographs: Northern Digital Inc. WAVE and Northern Digital Inc. VOX." Journal of Speech, Language, and Hearing Research 64, no. 7 (2021): 2637–67. http://dx.doi.org/10.1044/2021_jslhr-20-00394.

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Purpose This study compares two electromagnetic articulographs manufactured by Northern Digital, Inc.: the NDI Wave System (from 2008) and the NDI Vox-EMA System (from 2020). Method Four experiments were completed: (a) comparison of statically positioned sensors, (b) tracking dynamic movements of sensors manipulated using a motor-driven LEGO apparatus, (c) tracking small and large movements of sensors mounted in a rigid bar manipulated by hand, and (d) tracking movements of sensors rotated on a circular disc. We assessed spatial variability for statically positioned sensors, variability in the

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Ariza-López, Francisco, Juan Ruiz-Lendínez, and Manuel Ureña-Cámara. "Influence of Sample Size on Automatic Positional Accuracy Assessment Methods for Urban Areas." ISPRS International Journal of Geo-Information 7, no. 6 (2018): 200. http://dx.doi.org/10.3390/ijgi7060200.

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Gu, Jianyu, Russell Congalton, and Yaozhong Pan. "The Impact of Positional Errors on Soft Classification Accuracy Assessment: A Simulation Analysis." Remote Sensing 7, no. 1 (2015): 579–99. http://dx.doi.org/10.3390/rs70100579.

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Ruiz-Lendínez, J. J., F. J. Ariza-López, and M. A. Ureña-Cámara. "A point-based methodology for the automatic positional accuracy assessment of geospatial databases." Survey Review 48, no. 349 (2016): 269–77. http://dx.doi.org/10.1179/1752270615y.0000000030.

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Sapozhnikov, Nikolay, Aleksey Bryukhovetskiy, Aleksandr Polyakov, and Dmitriy Moiseev. "Modelling performing calculations over the data presented in a probabilistic form." MATEC Web of Conferences 224 (2018): 04019. http://dx.doi.org/10.1051/matecconf/201822404019.

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The article presents the results of comparison of different forms of representation and transformation of information in the form of non-positional probabilistic display. Assessment of the hardware of the compute nodes and the analysis of the relationship between accuracy of representing the information and their performance have been carried out.

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Brovelli, M. A., M. Minghini, M. E. Molinari, and M. Molteni. "DO OPEN GEODATA ACTUALLY HAVE THE QUALITY THEY DECLARE? THE CASE STUDY OF MILAN, ITALY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B2 (June 8, 2016): 609–14. http://dx.doi.org/10.5194/isprs-archives-xli-b2-609-2016.

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In the past number of years there has been an amazing flourishing of spatial data products released with open licenses. Researchers and professionals are extensively exploiting open geodata for many applications, which, in turn, include decision-making results and other (derived) geospatial datasets among their outputs. Despite the traditional availability of metadata, a question arises about the actual quality of open geodata, as their declared quality is typically given for granted without any systematic assessment. The present work investigates the case study of Milan Municipality (Northern

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Brovelli, M. A., M. Minghini, M. E. Molinari, and M. Molteni. "DO OPEN GEODATA ACTUALLY HAVE THE QUALITY THEY DECLARE? THE CASE STUDY OF MILAN, ITALY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B2 (June 8, 2016): 609–14. http://dx.doi.org/10.5194/isprsarchives-xli-b2-609-2016.

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In the past number of years there has been an amazing flourishing of spatial data products released with open licenses. Researchers and professionals are extensively exploiting open geodata for many applications, which, in turn, include decision-making results and other (derived) geospatial datasets among their outputs. Despite the traditional availability of metadata, a question arises about the actual quality of open geodata, as their declared quality is typically given for granted without any systematic assessment. The present work investigates the case study of Milan Municipality (Northern

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Adam, Sarhat M., and Abdulrahman F. Heeto. "The Use of Semi-Automated Method for Assessing the Horizontal Positional Accuracy of Google Earth imagery." Academic Journal of Nawroz University 7, no. 4 (2018): 173. http://dx.doi.org/10.25007/ajnu.v7n4a287.

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Google Earth imagery is frequently used in science, engineering, and other mapping applications. However, the company owning the tool announced that the data available in its geographical products is only approximate, so its accuracy is not officially documented. The Google Earth imagery in many areas around the world has been independently checked by scholars and third body parties. The estimated accuracies are found to largely vary depending on various factors but mainly due to, the imagery source or the image resolution. Positional accuracy testing methodology may also affect the assessment

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Omogunloye, Olushola Gabriel, Dahir M. Omar, Chukwuma John Okolie, Olagoke Emmanuel Daramola, and Tosin Julius Salami. "Comparative accuracy assessment of the Bowring, Chord and Power series models for direct and indirect determination of geodetic coordinates." South African Journal of Geomatics 10, no. 2 (2022): 101–14. http://dx.doi.org/10.4314/sajg.v10i2.9.

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The computation of geodetic coordinates is the basis of geodetic surveying and foundation to modern techniques for geodetic network analyses and design of integrated survey schemes for monitoring and detecting structural deformations. The positional accuracy achievable by Direct and Indirect models of geodetic position determination depends on the varying lengths, azimuths and latitude of the first point of the network of stations. Existing knowledge gaps preclude a comprehensive understanding of the relative accuracies of these methods. Therefore, the aim of this study is to determine the ach

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Eshghi, M., and A. A. Alesheikh. "ASSESSMENT OF COMPLETENESS AND POSITIONAL ACCURACY OF LINEAR FEATURES IN VOLUNTEERED GEOGRAPHIC INFORMATION (VGI)." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-1-W5 (December 10, 2015): 169–74. http://dx.doi.org/10.5194/isprsarchives-xl-1-w5-169-2015.

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Recent advances in spatial data collection technologies and online services dramatically increase the contribution of ordinary people to produce, share, and use geographic information. Collecting spatial data as well as disseminating them on the internet by citizens has led to a huge source of spatial data termed as Volunteered Geographic Information (VGI) by Mike Goodchild. Although, VGI has produced previously unavailable data assets, and enriched existing ones. But its quality can be highly variable and challengeable. This presents several challenges to potential end users who are concerned

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Manzano-Agugliaro, Francisco, Francisco G. Montoya, Carlos San-Antonio-Gómez, Sergio López-Márquez, Maria J. Aguilera, and Consolación Gil. "The assessment of evolutionary algorithms for analyzing the positional accuracy and uncertainty of maps." Expert Systems with Applications 41, no. 14 (2014): 6346–60. http://dx.doi.org/10.1016/j.eswa.2014.04.025.

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