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Using geographically weighted regression kriging for crop yield mapping in West Africa / Muhammad Imran in International journal of geographical information science IJGIS, vol 29 n° 2 (February 2015)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 29 n° 2 (February 2015) . - pp 234 - 257 Titre : Using geographically weighted regression kriging for crop yield mapping in West Africa Type de document : Article/Communication Auteurs : Muhammad Imran, Auteur ; Alfred Stein, Auteur ; Raul Zurita-Milla, Auteur Année de publication : 2015 Article en page(s) : pp 234 - 257 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] agriculture [Termes IGN] analyse de données [Termes IGN] Burkina Faso [Termes IGN] carte agricole [Termes IGN] cartographie statistique [Termes IGN] image SPOT-Végétation [Termes IGN] krigeage [Termes IGN] régression géographiquement pondérée [Termes IGN] rendement agricole [Termes IGN] sorgho (céréale) Résumé : (Auteur) Geographical information systems support the application of statistical techniques to map spatially referenced crop data. To do this in the optimal way, errors and uncertainties have to be minimized that are often associated with operations on the data. This paper applies a spatial statistical approach to upscale crop yields from the field level toward the scale of Burkina Faso. Observed yields were related to the Normalized Difference Vegetation Index derived from SPOT-VEGETATION. The objective was to quantify the uncertainties at the subsequent steps. First, we applied a point pattern analysis to examine uncertainties due to the sampling network of field surveys in the country. Second, geographically weighted regression kriging (GWRK) was applied to upscale the yield observations and to quantify the corresponding uncertainty. The proposed method was demonstrated with the mapping of sorghum yields in Burkina Faso and results were compared with those from regression kriging (RK) and kriging with external drift using a local kriging neighborhood (KEDLN). The proposed method was validated with independent yield observations obtained from field surveys. We observed that the lower uncertainty range value increased by 39%, and the upper uncertainty range value decreased by 51%, when comparing GWRK with RK and KEDLN. Moreover, GWRK reduced the prediction error variance as compared to RK (20 vs. 31) and to KEDLN (20 vs. 39). We found that climate and topography had a major impact on the country’s sorghum yields. Further, the financial ability of farmers influenced the crop management and, thus, the sorghum crop yields. We concluded that GWRK effectively utilized information present in the covariate datasets and improved the accuracies of both the regional-scale mapping of sorghum yields and was able to quantify the associated uncertainty. Numéro de notice : A2015-578 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2014.959522 En ligne : http://www.tandfonline.com/doi/full/10.1080/13658816.2014.959522 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77840 [article]

Crop yield estimation based on unsupervised linear unmixing of multidate hyperspectral imagery / B. Luo in IEEE Transactions on geoscience and remote sensing, vol 51 n° 1 Tome 1 (January 2013)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 51 n° 1 Tome 1 (January 2013) . - pp 162 - 173 Titre : Crop yield estimation based on unsupervised linear unmixing of multidate hyperspectral imagery Type de document : Article/Communication Auteurs : B. Luo, Auteur ; C. Yang, Auteur ; Jocelyn Chanussot, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 162 - 173 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse des mélanges spectraux [Termes IGN] classification non dirigée [Termes IGN] image hyperspectrale [Termes IGN] image multitemporelle [Termes IGN] rendement agricole [Termes IGN] sorgho (céréale) Résumé : (Auteur) Hyperspectral imagery, which contains hundreds of spectral bands, has the potential to better describe the biological and chemical attributes on the plants than multispectral imagery and has been evaluated in this paper for the purpose of crop yield estimation. The spectrum of each pixel in a hyperspectral image is considered as a linear combinations of the spectra of the vegetation and the bare soil. Recently developed linear unmixing approaches are evaluated in this paper, which automatically extracts the spectra of the vegetation and bare soil from the images. The vegetation abundances are then computed based on the extracted spectra. In order to reduce the influences of this uncertainty and obtain a robust estimation results, the vegetation abundances extracted on two different dates on the same fields are then combined. The experiments are carried on the multidate hyperspectral images taken from two grain sorghum fields. The results show that the correlation coefficients between the vegetation abundances obtained by unsupervised linear unmixing approaches are as good as the results obtained by supervised methods, where the spectra of the vegetation and bare soil are measured in the laboratory. In addition, the combination of vegetation abundances extracted on different dates can improve the correlations (from 0.6 to 0.7). Numéro de notice : A2013-012 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2012.2198826 Date de publication en ligne : 19/06/2012 En ligne : https://doi.org/10.1109/TGRS.2012.2198826 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32150 [article]

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Canopy leaf display effects on absorbed, transmitted, and reflected solar radiation / A.J. Richardson in Remote sensing of environment, vol 29 n° 1 (July 1989)  

Public [article]  inRemote sensing of environment > vol 29 n° 1 (July 1989) . - pp 15 - 24 Titre : Canopy leaf display effects on absorbed, transmitted, and reflected solar radiation Type de document : Article/Communication Auteurs : A.J. Richardson, Auteur ; C.L. Wiegand, Auteur Année de publication : 1989 Article en page(s) : pp 15 - 24 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] absorption [Termes IGN] bande infrarouge [Termes IGN] bande visible [Termes IGN] blé (céréale) [Termes IGN] céréales [Termes IGN] couvert végétal [Termes IGN] Gossypium (genre) [Termes IGN] rayonnement solaire [Termes IGN] réflectance végétale [Termes IGN] sorgho (céréale) [Termes IGN] Texas (Etats-Unis) Numéro de notice : A1989-345 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/0034-4257(89)90075-8 En ligne : https://doi.org/10.1016/0034-4257(89)90075-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25304 [article]

Radiometric measurements and crop yield forecasting : some observations over millet and sorghum experimental plots in Mali / E. Bartholome in International Journal of Remote Sensing IJRS, vol 9 n°10-11 (October-November 1988)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 9 n°10-11 (October-November 1988) . - pp 1539 - 1552 Titre : Radiometric measurements and crop yield forecasting : some observations over millet and sorghum experimental plots in Mali Type de document : Article/Communication Auteurs : E. Bartholome, Auteur Année de publication : 1988 Article en page(s) : pp 1539 - 1552 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] céréales [Termes IGN] Mali [Termes IGN] radiométrie [Termes IGN] réflectance végétale [Termes IGN] rendement agricole [Termes IGN] sorgho (céréale) Numéro de notice : A1988-330 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168808954959 En ligne : https://doi.org/10.1080/01431168808954959 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24909 [article]

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080-88101	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Vegetative and optical characteristics of four-row crop canopies / D.F. Wanjura in International Journal of Remote Sensing IJRS, vol 9 n° 2 (February 1988)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 9 n° 2 (February 1988) . - pp 249 - 258 Titre : Vegetative and optical characteristics of four-row crop canopies Type de document : Article/Communication Auteurs : D.F. Wanjura, Auteur ; J.L. Hatfield, Auteur Année de publication : 1988 Article en page(s) : pp 249 - 258 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] classification [Termes IGN] couvert végétal [Termes IGN] cultures [Termes IGN] Glycine max [Termes IGN] Gossypium (genre) [Termes IGN] indice de végétation [Termes IGN] réflectance [Termes IGN] sorgho (céréale) [Termes IGN] tournesol Numéro de notice : A1988-050 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168808954849 En ligne : https://doi.org/10.1080/01431168808954849 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24629 [article]

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080-88021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Variations in the polarized leaf reflectance of sorghum bicolor / L. Grant in Remote sensing of environment, vol 21 n° 3 (01/04/1987)  

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Landsat classification of Argentina summer crops / G.D. Badhwar in Remote sensing of environment, vol 21 n° 1 (01/02/1987)  

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