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Assessment of the possible drought impact on farm production in the SE of the province of Buenos Aires, Argentina / T. Hartmann in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 4 (February - March 2003)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 57 n° 4 (February - March 2003) . - pp 281 - 288 Titre : Assessment of the possible drought impact on farm production in the SE of the province of Buenos Aires, Argentina Type de document : Article/Communication Auteurs : T. Hartmann, Auteur ; C. Di Bella, Auteur ; P. Oricchio, Auteur Année de publication : 2003 Article en page(s) : pp 281 - 288 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] agriculture [Termes IGN] Buenos Aires (Argentine) [Termes IGN] image Landsat [Termes IGN] image NOAA-AVHRR [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] risque naturel [Termes IGN] sécheresse Résumé : (Auteur) The extend drought situation in the southeast of Buenos Aires during the second half of the year 2000 caused the government to invoke emergency laws. This action allowed farmers in the area to receive waivers for taxes and loans. The emergency laws remained in force during 2001, without further verification of environmental conditions for agriculture. Developing an assessment of the actual drought situation was relevant for taxing and national credit situations. An assessment was preformed of the actual drought situaton of farms during the spring of 2001 in seven counties in Buenos Aires Province area. The assessment was done by comparing vegetation index values (NDVI) - as measured from NOAA-AVHRR satellite data - of September 2001 against NDVI time series values from previous years. Five categories were established to describe the relationship between the present index and the average of the time series. Farms within the area covered by the study were assigned to appropriate category using GIS tools. It was confirmed that most of the area had NDVI values that were similar to the average values, or even higher. It was found that there were subareas where the vegetation index had decreased. For those cases, LANDSAT TM images of the area of september and Octobr of 2001 were used for a detailed inspection. The study included rainfall data as well, confirming a normal regional situation. Both low and high resolution satellite images were found to be usefull tools for obtaining fast, economic, objective and conclusive results about the production capability of individual farms as well as the region as a whole. Copyright ISPRS Numéro de notice : A2003-025 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(02)00153-3 En ligne : https://doi.org/10.1016/S0924-2716(02)00153-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22322 [article]

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