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Littérature scientifique sur le sujet « Spatial frequencie »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Spatial frequencie"

Zhang Zhe, 张喆, 郑东晖 Zheng Donghui, 陈磊 Chen Lei та 李金鹏 Li Jinpeng. "低空间频率干涉条纹的载频计算方法". Acta Optica Sinica 44, № 4 (2024): 0412005. http://dx.doi.org/10.3788/aos231718.

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Pankil Butala, Pankil Butala, Hany Elgala Hany Elgala, and Thomas D. C. Little Thomas D. C. Little. "Sample indexed spatial orthogonal frequency division multiplexing." Chinese Optics Letters 12, no. 9 (2014): 090602–90606. http://dx.doi.org/10.3788/col201412.090602.

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ICHIHARA, SHIGERU. "Perceived spatial frequency shift after adaptation to compound gratings of two sinusoidals in phase or 180° out of phase." Japanese Psychological Research 29, no. 1 (1987): 10–16. http://dx.doi.org/10.4992/psycholres1954.29.10.

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Lee, Jeunghoon, Yongsung Park, and Peter Gerstoft. "Generalized frequency-sum beamforming for low frequencies." Journal of the Acoustical Society of America 156, no. 6 (2024): 4037–47. https://doi.org/10.1121/10.0034621.

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For direction-of-arrival (DOA) estimation in the low-frequency range, we improve spatial resolution using generalized frequency-sum (gFS) beamforming with the Qth order frequency-sum autoproduct. The order Q does not exceed the maximum value, determined by the criteria that the sum of frequencies used to create the autoproduct must be less than the array's spatial Nyquist frequency. Unlike other high-resolution beamformers, gFS maintains stable performance even with a single snapshot and is unaffected by the coherence of steering vectors. Rigorous analysis using the multinomial expansion has s

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Pohl, M., and R. Börret. "Simulation of mid-spatials from the grinding process." Journal of the European Optical Society-Rapid Publications 11 (2016): 16010. https://doi.org/10.1051/jeos.2016.16010.

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This paper focuses on the simulation of the creation of mid-spatial frequencies (mid-spatials) during the grinding process of optical components. The goal is to simulate this generation process and determine the correlating grinding parameters for mid-spatials. On this base, grinding parameters which lead to less mid-spatials could be determined.

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Stancă Ionut, Rizea Ileana Olguta, Popescu Andreea Caterina, Albu Alice, Rus Mihaela, and Fica Simona. "The importance of cardiac tomography in the evaluation of cardiac changes and coronary atherosclerosis in patients with betathalassemia major." Technium Social Sciences Journal 11 (September 14, 2020): 602–11. http://dx.doi.org/10.47577/tssj.v11i1.1677.

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Betathalassemic patients demonstrate an increased rate of extracardiac vascular complications, but very low prevalence for coronary artery disease. Computed tomography (CT) achieves excellent tissue characterization, with high spatial resolution and has developed as a gold standard for noninvasive angiography and calcium score assessment. Methods. We examined 7 patients with major beta-thalassemia and 7 patients who had an indication for cardiac CT for resting ECG changes, without symptoms of angina pectoris. We investigated the coronary atherosclerosis by assessing the coronary artery calcium

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Zhou, Y. X., and C. L. Baker. "Spatial properties of envelope-responsive cells in area 17 and 18 neurons of the cat." Journal of Neurophysiology 75, no. 3 (1996): 1038–50. http://dx.doi.org/10.1152/jn.1996.75.3.1038.

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1. Many neurons in areas 17 and 18 respond to spatial contrast envelope stimuli whose Fourier components fall outside the cell's spatial-frequency-selective range. The spatial properties of such envelope responses are investigated here and compared with responses to conventional luminance-defined gratings to explore the underlying receptive-field mechanism. 2. Three spatial properties of envelope responses are reported more extensively in this paper. First, the envelope responses were selective to the carrier spatial frequency in a narrow range of frequencies higher than a given cell's luminan

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Sagi, Dov, and Shaul Hochstein. "Lateral inhibition between spatially adjacent spatial-frequency channels?" Perception & Psychophysics 37, no. 4 (1985): 315–22. http://dx.doi.org/10.3758/bf03211354.

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COHEN, LEON. "Time-Frequency Spatial-Spatial Frequency Representations." Annals of the New York Academy of Sciences 808, no. 1 Nonlinear Sig (1997): 97–115. http://dx.doi.org/10.1111/j.1749-6632.1997.tb51655.x.

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Shi Zhiguo, 石志国, 张洋 Zhang Yang, 王全福 Wang Quanfu та ін. "偏振空间频域成像系统及仿体验证". Chinese Journal of Lasers 50, № 9 (2023): 0907104. http://dx.doi.org/10.3788/cjl221483.

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Thèses sur le sujet "Spatial frequencie"

SILVESTRI, VALENTINA. "AND I’LL SEE YOU IN THE HIGH AND LOW. The ontogenetic origins of sensitivity to facial cues to trustworthiness and emotion." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/379215.

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Una componente fondamentale della competenza sociale degli esseri umani è l'abilità di estrarre rapidamente e in modo spontaneo i segnali sociali che provengono dal volto, quali per esempio i tratti emotivi e di affidabilità. Il fatto che le risposte a queste configurazioni facciali siano rapide e automatiche suggerisce come esse derivino dalla pressione evolutiva a rilevare segnali di pericolo per aumentare le possibilità di sopravvivenza. Tuttavia, le origini ontogenetiche di queste abilità sociali sono ancora oggetto di dibattito. La presente tesi di dottorato si pone l'obiettivo di indaga

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McSorley, Eugene. "Spatiotemporal integration of spatial frequencies." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4615/.

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Spatial frequency processing delays suggest that their integration occurs from coarse to fine. However it may be the case that integration is flexible. The first aim of this thesis was to examine the integration of spatial frequencies and the second was to examine the delays involved in initial spatial frequency processing. A coarse to fine and a fine to coarse presentation order of filtered natural images were shown. The former is judged to be of a higher quality (experiment 1) but neither show any increase in incorrect detection reports of a fullbandwidth image (experiment 2, 3 and 4). When

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Costen, Nicholas Paul. "Spatial frequencies and face recognition." Thesis, University of Aberdeen, 1994. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU069146.

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If face images are degraded by spatial quantisation there is a non-linear acceleration of the decline of recognition accuracy as block-size increases, suggesting recognition requires a critical minimum range of object spatial frequencies. These may define the facial configuration, reflecting the structural properties allowing differentiation of faces. Experiment 1 measured speed and accuracy of recognition of six fronto-parallel faces shown with 11, 21 and 42 pixels/face, produced by quantisation, a Fourier low-pass filter and Gaussian blurring. Performance declined with image quality in a sig

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Jeantet, Coline. "Evaluation du traitement visuel précoce des visages chez les usagers de cannabis : étude par potentiels évoqués." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0329/document.

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Le cannabis est la drogue illégale la plus consommée actuellement en France. Le Δ9-tétrahydrocannabinol (Δ9-THC), en tant qu’excocannabinoïde, a un impact sur le système visuel via le système endocannabinoïde. Physiologiquement, parmi les deux voies majoritairement responsables de la transmission de l’information visuelle aux stades les plus précoces, la voie magnocellulaire pourrait être la plus sensible à l’effet du Δ9-THC. La perception des visages, stimuli complexes, nécessite le traitement précoce d’informations de bas niveaux : les fréquences spatiales. Or, les différentes gammes de fréq

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Wiles, Andrew Donald. "Modelling Framework for Radio Frequency Spatial Measurement." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/771.

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The main crux of this thesis was to produce a model that was capable of simulating the theoretical performance of different configurations for a spatial measurement system using radio frequency technology. It has been important to study new modalities of spatial measurement since spatial measurement systems are an enabling technology that have allowed for the creation of better medical procedures and techniques, provided valuable data for motion capture in animation and biomechanics, and have improved the quality of manufacturing processes in many industries. However, there has been room f

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Mudassar, Asloob Ahmad. "Active aperture synthesis using spatial frequency heterodyning." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/158.

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Elias, Bartholomew. "Cross-modal facilitation of spatial frequency discriminations through auditory frequency cue presentations." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/28611.

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Shrekenhamer, David. "Dynamic Control of Metamaterials at Terahertz Frequencies." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3152.

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Thesis advisor: Willie J. Padilla<br>Progress in the field of metamaterials has started coming to a point where the field may finally begin to emerge as a viable solution to many electromagnetic challenges facing the community. No where is that more true then at terahertz frequencies where there lies an immense opportunity for growth. The development of mature technologies within this region of the electromagnetic spectrum would provide a valuable resource to become available for a multitude of applications. In order to achieve this, the necessary first steps of identifying viable materials an

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Méred, Mohamed Chakib. "Théorie chromatique de l'effet Lau : Application au codage de fréquences spatiales et de densités en fausse couleur." Besançon, 1986. http://www.theses.fr/1986BESA2022.

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Role du codage en fausse couleur dans l'analyse visuelle de l'information. Tour d'horizon comparatif des différentes méthodes de codage optiques. Codage en fausse couleur base sur l'effet lau. Théorie chromatique de l'effet lau et sa génération

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Foster, Collin David. "Spatial parameter estimation using measured frequency response functions." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314556.

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Livres sur le sujet "Spatial frequencie"

Pulkki, Ville, Symeon Delikaris-Manias, and Archontis Politis, eds. Parametric Time-Frequency Domain Spatial Audio. John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119252634.

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Ozin, Linda. Age differences in the shape of spatial frequency filters. National Library of Canada, 1994.

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Simons, Rainee N. Spatial frequency multiplier with active linearly tapered slot antenna array. National Aeronautics and Space Administration, 1994.

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Zahar, Yadh. Eléments d'hydrologie pour l'aménagement: Modélisation spatiale et temporelle des précipitations extrêmes et érosives en Tunisie centrale. Université des lettres, des arts et des sciences humaines, Tunis I, Faculté des lettres de la Manouba, 1997.

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Gold, Jason M. The role of spatial frequency information in the identification of complex visual patterns. National Library of Canada, 1996.

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Chabane, G. The detection of chromatic and achromatic patterns by mechanismsworking in the spatial frequency range. UMIST, 1993.

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G, Schaefer Melvin, Washington (State). Dept. of Transportation., Washington State Transportation Commission. Planning and Programming Service Center., MGS Engineering Consultants Inc, and Oregon Climate Service, eds. Regional precipitation-frequency analysis and spatial mapping of precipitation for 24-hour and 2-hour durations in western Washington. Washington State Dept. of Transportation, 2002.

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Safford, Hugh D. Using fire return interval departure (FRID) analysis to map spatial and temporal changes in fire frequency on national forest lands in California. United States Department of Agriculture, Forest Service, Pacific Southwest Research Station, 2014.

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1953-, Wilson Charles A., United States. Minerals Management Service. Gulf of Mexico OCS Region., and Coastal Marine Institute (Baton Rouge, La.), eds. Seasonal and spatial variation in the biomass and size frequency distribution of the fish associated with oil and gas platforms in the northern Gulf of Mexico. U.S. Dept. of the Interior, Minerals Management Service, Gulf of Mexico OCS Region, 2000.

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Stanley, David R. Seasonal and spatial variation in the biomass and size frequency distribution of the fish associated with oil and gas platforms in the northern Gulf of Mexico. U.S. Dept. of the Interior, Minerals Management Service, Gulf of Mexico OCS Region, 2000.

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Chapitres de livres sur le sujet "Spatial frequencie"

Heilbronner, Renée, and Steve Barrett. "Spatial Frequencies." In Image Analysis in Earth Sciences. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-10343-8_19.

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Cristóbal, Gabriel, Salvador Gabarda, and Leon Cohen. "Joint Spatial/Spatial-Frequency Representations." In Optical and Digital Image Processing. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527635245.ch5.

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Swearer, Joan. "Spatial Frequency Analysis." In Encyclopedia of Clinical Neuropsychology. Springer New York, 2011. http://dx.doi.org/10.1007/978-0-387-79948-3_1403.

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Swearer, Joan. "Spatial Frequency Analysis." In Encyclopedia of Clinical Neuropsychology. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56782-2_1403-2.

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Swearer, Joan. "Spatial Frequency Analysis." In Encyclopedia of Clinical Neuropsychology. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57111-9_1403.

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Martin, Willy. "Variation in lexical frequency." In Distributions spatiales et temporelles, constellations des manuscrits/Spatial and Temporal Distributions, Manuscript Constellations. John Benjamins Publishing Company, 1988. http://dx.doi.org/10.1075/z.37.16mar.

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Griffith, Daniel A., and Jean H. P. Paelinck. "Frequency Distributions for Simulated Spatially Autocorrelated Random Variables." In Non-standard Spatial Statistics and Spatial Econometrics. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16043-1_4.

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Saager, Rolf B. "Spatial Frequency Domain Imaging." In Coded Optical Imaging. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-39062-3_9.

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Söderlind, Gustaf. "Spatial frequencies and iterative methods." In Springer Series in Computational Mathematics. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-74379-5_27.

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Allard, Denis, Xavier Emery, Céline Lacaux, and Christian Lantuéjoul. "Simulation of Stationary Gaussian Random Fields with a Gneiting Spatio-Temporal Covariance." In Springer Proceedings in Earth and Environmental Sciences. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-19845-8_4.

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AbstractThe nonseparable Gneiting covariance has become a standard to model spatio-temporal random fields. Its definition relies on a completely monotone function associated with the spatial structure and a conditionally negative semidefinite function associated with the temporal structure. This work addresses the problem of simulating stationary Gaussian random fields with a Gneiting-type covariance. Two algorithms, in which the simulated field is obtained through a combination of cosine waves are presented and illustrated with synthetic examples. In the first algorithm, the temporal frequenc

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Actes de conférences sur le sujet "Spatial frequencie"

McIntosh, K. A., L. J. Mahoney, K. M. Molvar, O. B. McMahon, M. Rothschild, and E. R. Brown. "Infrared Metallodielectric Photonic Crystals." In Spatial Light Modulators. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.smc.2.

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During the past several years there has been significant research involving the design, measurement, and theory of periodic dielectric structures that exhibit a photonic bandgap.1 These photonic crystal structures could be useful in many applications that require frequency specific optical modulators or reflectors. As demonstrated recently at microwave frequencies, photonic crystal structures that incorporate metallic scattering centers can exhibit large electromagnetic stop bands.2 The resulting structures are referred to as metallodielectric photonic crystals (MDPCs). We report here progress

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Billock, Vincent A., and Thomas H. Harding. "Spatio-temporal tuning of temporal frequency mechanisms." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thaa7.

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Billock and Harding (ARVO, 1991) derived three temporal frequency mechanisms responsible for the independent detection of temporal modulated 4 c/deg gratings. Here we extend this approach to a wide range of spatial frequencies. We measured binocular spatio–temporal contrast sensitivity in thirty young (18–35 yr) observers. The stimuli were presented at 100 cd/m2 and were embedded in an extended surround of the same luminance and chromaticity. Spatial frequency ranged from 0.5 to 22.6 c/deg in steps of an octave. Temporal frequency ranged from 0.25 to 32 Hz in steps of 0.5 octave. For each spat

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Vicari, L. "Dielectric Behavior Of Polymer Dispersed Liquid Crystals." In Spatial Light Modulators. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.stue.1.

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A Polymer Dispersed Liquid Crystal (PDLC) is a dispersion of liquid crystal microdroplets in a polymeric binder. Droplets are randomly oriented anisotropic spheres and, if their size is close to visible light wavelength, produce a strong light scattering so that the sample is translucent. Light scattering is due to the refractive index mismatch between droplets and surrounding polymer, and can be controlled by changing the droplets effective refractive index: this can be achieved in different manners, but usually it is easily obtained applying an external, low frequency, electric field. Possib

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Burbeck, Christina A. "Pattern adaptation in detection and discrimination." In OSA Annual Meeting. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.wt8.

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Previous findings indicate that detection and discrimination of sine wave gratings do not occur at a common site. The effects of pattern adaptation are fundamentally different for detection and discrimination,1 and frequency discrimination is based on the object spatial frequencies, whereas contrast detection thresholds are based on the retinal spatial frequencies.2 These findings raise the question: are the effects of pattern adaptation on frequency discrimination3 tied to the object spatial frequencies or to the retinal spatial frequencies? We were unable to replicate Regan and Beverley's re

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Rohaly, Ann Marie, and Hugh R. Wilson. "Coarse disparity processing does not shift fine scale processing." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wm7.

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Several stereomatching algorithms posit that processing on coarse (low spatial frequency) scales constrains processing on fine (high spatial frequency) scales by shifting the disparity range over which fine mechanisms operate. To test this hypothesis, we measured stereoacuity and stereo increment thresholds for high spatial frequency test stimuli in the presence of low spatial frequencies. If high spatial frequency mechanisms are always shifted to an optimal range for disparity processing, as proposed in the coarse-to-fine models, stereo increment thresholds for high frequencies in the presenc

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Chan, Hoover, Christopher W. Tyler, and Lei Liu. "Asymmetries in the perception of luminance increments and decrements at low contrasts." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thaa6.

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Studies of luminance increments and decrements have typically used transient pulses of localized stimuli. We employed two new paradigms to examine increment/decrement response asymmetries in grating stimuli presented with a smooth spatio–temporal envelope. For the first paradigm, we studied apparent width of the light and dark bars making up sinusoidal gratings as a function of contrast. In contrast ranges close to threshold, the light bars appeared up the three times wider than the dark bars, with a peak at contrast of ~3%. Similar asymmetries were seen over a range of spatial frequencies. Fo

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McCourt, Mark E. "Spatial-frequency tuning, contrast tuning, and spatial summation of suprathreshold lateral spatial interactions: grating induction and contrast–contrast." In OSA Annual Meeting. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.wrr.3.

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Two supra-threshold lateral interactions, the grating-induction effect,1 and the contrast–contrast effect,2,3 were compared regarding their dependence upon inducing grating spatial frequency, inducing and “victim” grating contrast, and inducing grating extent. Both effects cause “victim” gratings to be matched non-veridically. The respective magnitude of the effects was measured in common units which indexed the veridicality of contrast matches across a wide range (-0.9 to 0.9) of “victim” grating contrast. Grating induction had a low-pass, and contrast-contrast had a high-pass spatial frequen

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Abraham, N. B., L. M. Hoffer, and G. L. Lippi. "Phase and Frequency Dynamics in a Bidirectional Ring Laser." In Optical Bistability. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/obi.1988.wc.4.

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Homogeneously broadened bidirectional ring lasers show alternation of the lasing direction induced dynamically by a long-lived population grating and slight detuning of the laser cavity from the atomic resonance1. We show that the mode switching is accompanied by abrupt jumps by pi in the total relative phase of the system2. Our analysis reveals that the carrier frequencies of the two modes are not equal even though the two unidirectional steady state solutions have the same frequency2. When one mode dominates and the other is suppressed, the dominant mode has the steady state frequency. Howev

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Klein, Stanley A., and Brent Beutter. "Hermite functions maximize the spacespatial frequency uncertainty of Gaborlike functions." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.ww3.

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Wavelets that are localized both in space and in spatial frequency are useful for vision modeling and image processing. For example, in image compression one would like localization in spatial frequency so that the small spatial filters are insensitive to low spatial frequencies to which the visual system is highly sensitive. One would also like spatially localized filters to reduce interference between adjacent features. Several investigators, including Gabor, asked what particular wavelet shape minimizes the joint space-spatial frequency uncertainty (the Heisenberg uncertainty). Consider the

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HASHIMOTO, Nobuyuki. "High-resolution LCTV-SLM and its application to holography." In Spatial Light Modulators. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.stua.2.

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The MIM active matrix liquid crystal device with pixel pitch of 30 μm has been developed and its holographic display characteristics and application to 3D holography have been studied. In the system, a CCD camera reads holographic fringes with quite low career spatial frequency and the fringes are transferred and displayed on the SLM. We use the spatial filtering technique to reduce 0 th. order diffracted light on reconstruction. Recent results of polarization filtering to remove 0 th. order light and of 3M pixel LCDs using MIM technology are presented.

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Rapports d'organisations sur le sujet "Spatial frequencie"

Fitzgerald, T. J. Spatial and frequency coherence of oblique, one-hop, high-frequency paths. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/114649.

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Patterson, Frederick R., and Joseph F. Chandler. Effect of Acceleration Frequency on Spatial Orientation Mechanisms. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada529816.

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Mathew, Sonu, Srinivas S. Pulugurtha, and Sarvani Duvvuri. Modeling and Predicting Geospatial Teen Crash Frequency. Mineta Transportation Institute, 2022. http://dx.doi.org/10.31979/mti.2022.2119.

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This research project 1) evaluates the effect of road network, demographic, and land use characteristics on road crashes involving teen drivers, and, 2) develops and compares the predictability of local and global regression models in estimating teen crash frequency. The team considered data for 201 spatially distributed road segments in Mecklenburg County, North Carolina, USA for the evaluation and obtained data related to teen crashes from the Highway Safety Information System (HSIS) database. The team extracted demographic and land use characteristics using two different buffer widths (0.25

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Maimone, Mark W., and Steven A. Shafer. Modeling Foreshortening in Stereo Vision Using Local Spatial Frequency. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada292246.

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Huang, Ben. Removing Textured Artifacts from Digital Photos Using Spatial Frequency Filtering. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.148.

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Nguyen, H. T., J. A. Britten, R. D. Boyd, B. D. Shore, and M. D. Perry. Ultrahigh spatial-frequency, high-contrast periodic structures produced by interference lithography. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/489588.

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Yamano, Takashi, Murali Krishna Gumma, Pranay Panjala, et al. Applying Spatial Analysis to Assess Crop Damage: A Case Study of the Pakistan 2022 Floods. Asian Development Bank, 2024. http://dx.doi.org/10.22617/wps240225-2.

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Climate change is expected to increase the frequency and magnitude of extreme weather events in Pakistan. During and immediately after such events many locations are inaccessible, yet the government needs evidence-based data to help plan effective responses. This paper uses spatial analysis and spectral mapping to assess the agricultural damage from the 2022 floods in Pakistan. Spatial analysis could be a vital tool in assessing and verifying damage from disaster events. The paper emphasizes the need to build spatial analysis capacities in provincial crop reporting services and the Ministry of

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D'Spain, Gerald L. Mid-Frequency Ambient Noise Spatial Structure and Implications for Passive Signal Processing. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada438283.

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Amin, Moeness. Classification and Discrimination of Sources with Time-Varying Frequency and Spatial Spectra. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada406349.

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Marcotte, D. Spatial estimation of frequency distribution of acid rain data using Bigaussian kriging. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/128070.

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