Relevant bibliographies by topics / Zenith angle measurement

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Zenith angle measurement'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Zenith angle measurement"

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Yang, Yao, Wanchao Ma, Zhe Wang, Kai Zhang, and Xikui Miao. "Research on Improved Method of Schlick Model Based on BRDF Measurement." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 36, no. 6 (2018): 1069–75. http://dx.doi.org/10.1051/jnwpu/20183661069.

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In simulating an infrared scene, the Schlick model uses a commonly-used bidirectional reflection distributional function(BRDF) model. Through simulation and BRDF measurement, this paper points out that the Schlick model is in better agreement with the actual output when the emerging zenith angle is smaller than the incident zenith angle. But when the emerging zenith angle is a certain angle larger than the incident zenith angle, the output of the function value may increase with the increasing emerging zenith angle and may not be in agreement with the actual output. In this paper, a new improv
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Blanc, P., and L. Wald. "On the effective solar zenith and azimuth angles to use with measurements of hourly irradiation." Advances in Science and Research 13 (February 2, 2016): 1–6. http://dx.doi.org/10.5194/asr-13-1-2016.

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Abstract. Several common practices are tested for assessing the effective solar zenith angle that can be associated to each measurement in time-series of in situ or satellite-derived measurements of hourly irradiation on horizontal surface. High quality 1 min measurements of direct irradiation collected by the BSRN stations in Carpentras in France and Payerne in Switzerland, are aggregated to yield time series of hourly direct irradiation on both horizontal and normal planes. Time series of hourly direct horizontal irradiation are reconstructed from those of hourly direct normal irradiation an
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Anandan, V. K., I. Srinivasa Rao, and P. Narasimha Reddy. "A Study on Optimum Tilt Angle for Wind Estimation Using Indian MST Radar." Journal of Atmospheric and Oceanic Technology 25, no. 9 (2008): 1579–89. http://dx.doi.org/10.1175/2008jtecha1030.1.

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Abstract The effect of tilt angle on horizontal wind estimation is studied using Indian mesosphere–stratosphere–troposphere (MST) radar located at Gadanki (13.45°N, 79.18°E). It operates in Doppler beam swinging (DBS) mode with a beamwidth of 3°. Horizontal winds are computed for different tilt angles from 3° to 15° with an increment of 3° from a height range of 3.6–18 km. The effective beam pointing angle (θeff) is calculated to determine the effect of aspect sensitivity on the determination of horizontal wind components. For different tilt angles radar-derived winds are compared with simulta
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Bhadra, S., V. Sagan, C. Nguyen, M. Braud, A. L. Eveland, and T. C. Mockler. "AUTOMATIC EXTRACTION OF SOLAR AND SENSOR IMAGING GEOMETRY FROM UAV-BORNE PUSH-BROOM HYPERSPECTRAL CAMERA." ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences V-3-2022 (May 17, 2022): 131–37. http://dx.doi.org/10.5194/isprs-annals-v-3-2022-131-2022.

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Abstract. Calculating solar-sensor zenith and azimuth angles for hyperspectral images collected by UAVs are important in terms of conducting bi-directional reflectance function (BRDF) correction or radiative transfer modeling-based applications in remote sensing. These applications are even more necessary to perform high-throughput phenotyping and precision agriculture tasks. This study demonstrates an automated Python framework that can calculate the solar-sensor zenith and azimuth angles for a push-broom hyperspectral camera equipped in a UAV. First, the hyperspectral images were radiometric
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Bogren, W. S., J. F. Burkhart, and A. Kylling. "Tilt error in cryospheric surface radiation measurements at high latitudes: a model study." Cryosphere Discussions 9, no. 4 (2015): 4355–76. http://dx.doi.org/10.5194/tcd-9-4355-2015.

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Abstract. We have evaluated the magnitude and makeup of error in cryospheric radiation observations due to small sensor misalignment in in-situ measurements of solar irradiance. This error is examined through simulation of diffuse and direct irradiance arriving at a detector with a cosine-response foreoptic. Emphasis is placed on assessing total error over the solar shortwave spectrum from 250 to 4500 nm, as well as supporting investigation over other relevant shortwave spectral ranges. The total measurement error introduced by sensor tilt is dominated by the direct component. For a typical hi
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Bogren, Wiley Steven, John Faulkner Burkhart, and Arve Kylling. "Tilt error in cryospheric surface radiation measurements at high latitudes: a model study." Cryosphere 10, no. 2 (2016): 613–22. http://dx.doi.org/10.5194/tc-10-613-2016.

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Abstract. We have evaluated the magnitude and makeup of error in cryospheric radiation observations due to small sensor misalignment in in situ measurements of solar irradiance. This error is examined through simulation of diffuse and direct irradiance arriving at a detector with a cosine-response fore optic. Emphasis is placed on assessing total error over the solar shortwave spectrum from 250 to 4500 nm, as well as supporting investigation over other relevant shortwave spectral ranges. The total measurement error introduced by sensor tilt is dominated by the direct component. For a typical h
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Appeltans, Simon, Angela Guerrero, Said Nawar, Jan Pieters, and Abdul M. Mouazen. "Practical Recommendations for Hyperspectral and Thermal Proximal Disease Sensing in Potato and Leek Fields." Remote Sensing 12, no. 12 (2020): 1939. http://dx.doi.org/10.3390/rs12121939.

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Thermal and hyperspectral proximal disease sensing are valuable tools towards increasing pesticide use efficiency. However, some practical aspects of the implementation of these sensors remain poorly understood. We studied an optimal measurement setup combining both sensors for disease detection in leek and potato. This was achieved by optimising the signal-to-noise ratio (SNR) based on the height of measurement above the crop canopy, off-zenith camera angle and exposure time (ET) of the sensor. Our results indicated a clear increase in SNR with increasing ET for potato. Taking into account pr
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Rahlves, Charlotte, Frank Beyrich, and Siegfried Raasch. "Scan strategies for wind profiling with Doppler lidar – an large-eddy simulation (LES)-based evaluation." Atmospheric Measurement Techniques 15, no. 9 (2022): 2839–56. http://dx.doi.org/10.5194/amt-15-2839-2022.

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Abstract. Doppler-lidar scan techniques for wind profiling rely on the assumption of a horizontally homogeneous wind field and stationarity for the duration of the scan. As this condition is mostly violated in reality, detailed knowledge of the resulting measurement error is required. The objective of this study is to quantify and compare the expected error associated with Doppler-lidar wind profiling for different scan strategies and meteorological conditions by performing virtual Doppler-lidar measurements implemented in a large-eddy simulation (LES) model. Various factors influencing the li
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Chen, D., B. Zhou, S. Beirle, L. M. Chen, and T. Wagner. "Tropospheric NO<sub>2</sub> column densities deduced from zenith-sky DOAS measurements in Shanghai, China, and their application to satellite validation." Atmospheric Chemistry and Physics Discussions 8, no. 4 (2008): 16713–62. http://dx.doi.org/10.5194/acpd-8-16713-2008.

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Abstract. Zenith-sky scattered sunlight observations using differential optical absorption spectroscopy (DOAS) technique were carried out in Shanghai, China (31.3° N, 121.5° E) since December 2006. At this polluted urban site, the measurement provided NO2 total columns in the daytime. Here, we present a new method to extract time series of tropospheric vertical column densities (VCD) of NO2 from these observations. The derived tropospheric NO2 VCD is an important quantity for the estimation of emissions and for the validation of satellite observations. Our method makes use of assumptions on th
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Kamil Krasuski and Artur Gos. "The Numerical Simulation of the Atmosphere Delays Impact on Radar Measurement in Aviation." Communications - Scientific letters of the University of Zilina 21, no. 4 (2019): 19–26. http://dx.doi.org/10.26552/com.c.2019.4.19-26.

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The article presents numerical simulations with regard to determining the impact of the ionospheric and tropospheric delays on a radar-aircraft slant distance measurement. During the first experimental test, numerical calculations were made, showing the relationship between the ionosphere correction and the zenith angle in order to determine the measurement error of a radar-aircraft slant distance. During the second experimental test, numerical calculations were made demonstrating a relationship between the tropospheric correction and zenith angle in order to determine a measurement error of a
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Dissertations / Theses on the topic "Zenith angle measurement"

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Зубик, Назар Олександрович. "Інклінометр (вимірювальний перетворювач для визначення зенітного кута)". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/42226.

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В роботі представлено спроектовану систему вимірювання зенітного кута інклінометра. Проведено огляд засобів вимірювання зенітного кута інклінометра представлено історичний огляд розвитку систем вимірювання зенітного кута на базі акселерометрів і гіроскопів. Розроблено програмну модель інклінометра та проведено дослідження в середовищі MatLab. Розроблено конструктивну схему вимірювача зенітного кута та представлена принципова схема акселерометра<br>Current paper presents a system designed for measuring of an inclinometer’s zenith angle. The review of measurement instruments of an inclinomete
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Reddy, Niveditha Hanumantha. "A procedure to predict the energy harvest of photovoltaic arrays using only global horizontal radiation measurements." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1355.

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This thesis uses the results of analysis of data recorded at a solar monitoring station in West Texas and the knowledge from an existing solar radiation estimation model to develop a methodology to predict the energy output from a panel at a site using only partial radiation data - global horizontal radiation measurements. The prediction using partial data is validated against estimates acquired using the complete radiation data and constraints are defined for accurate prediction. The methodology presented in this thesis can be used to accurately predict the solar power/energy incident on a co
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Books on the topic "Zenith angle measurement"

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Iwatsubo, E. Y. Measurements of slope distances and zenith angles at Newberry and South Sister volcanoes, Oregon, 1985-1986. U.S. Geological Survey, 1988.

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Measurements of slope distances and zenith angles at Newberry and South Sister volcanoes, Oregon, 1985-1986. U.S. Dept. of the Interior, Geological Survey, 1988.

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Y, Iwatsubo E., and Geological Survey (U.S.), eds. Measurements of slope distances and zenith angles at Augustine Volcano, Alaska, 1986, 1988, and 1989. Dept. of the Interior, U.S. Geological Survey, 1998.

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Book chapters on the topic "Zenith angle measurement"

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Sliney, David H., Rodney L. Wood, Patrick M. Moscato, Wesley J. Marshall, and Paul Eriksen. "Ultraviolet Exposure in the Outdoor Environment: Measurements of Ambient Ultraviolet Exposure Levels at Large Zenith Angles." In NATO ASI Series. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-0661-8_12.

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"zenith angle measurement." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_260007.

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Conference papers on the topic "Zenith angle measurement"

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Bae, Junghyun, Stylianos Chatzidakis, and Robert Bean. "Effective Solid Angle Model and Monte Carlo Method: Improved Estimations to Measure Cosmic Muon Intensity at Sea Level in All Zenith Angles." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-63444.

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Abstract Cosmic muons are highly energetic and penetrative particles and these figures are used for imaging of large and dense objects such as spent nuclear fuels in casks and special nuclear materials in cargo. Cosmic muon intensity depends on the incident angle (zenith angle, φ), and it is known that I(φ) = I0 cos2 φ at sea level. Low intensity of cosmic muon requires long measurement time to acquire statistically meaningful counts. Therefore, high-energy particle simulations e.g., GEANT4, are often used to guide measurement studies. However, the measurable cosmic muon count rate changes upo
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Walters, Donald L. "Saturation And The Zenith Angle Dependence Of Atmospheric Isoplanatic Angle Measurements." In 1985 Technical Symposium East, edited by Jacques E. Ludman. SPIE, 1986. http://dx.doi.org/10.1117/12.948992.

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Walters, Donald L. "Saturation And The Zenith Angle Dependence Of Atmospheric Isoplanatic Angle Measurements." In 1985 Technical Symposium East, edited by Richard Gomez. SPIE, 1985. http://dx.doi.org/10.1117/12.948394.

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Thilak, Vimal, David Voelz, Charles Creusere, and Srikanth Damarla. "Estimating the refractive index and reflected zenith angle of a target using multiple polarization measurements." In Defense and Security Symposium, edited by Dennis H. Goldstein and David B. Chenault. SPIE, 2006. http://dx.doi.org/10.1117/12.666183.

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Myers, Daryl R., Thomas L. Stoffel, Ibrahim Reda, Stephen M. Wilcox, and Afshin M. Andreas. "Recent Progress in Reducing the Uncertainty in and Improving Pyranometer Calibrations." In ASME 2001 Solar Engineering: International Solar Energy Conference (FORUM 2001: Solar Energy — The Power to Choose). American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/sed2001-126.

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Abstract The Measurements and Instrumentation Team within the Distributed Energy Resources Center at the National Renewable Energy Laboratory, NREL, calibrates pyranometers for outdoor testing solar energy conversion systems. The team also supports climate change research programs. These activities led NREL to improve pyranometer calibrations. Low thermal-offset radiometers measuring the sky diffuse component of the reference solar irradiance removes bias errors on the order of 20 Watts per square meter (W/m2) in the calibration reference irradiance. Zenith angle dependent corrections to respo
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