%0 Journal Article
%4 sid.inpe.br/iris@1912/2005/07.19.21.02.27
%2 sid.inpe.br/iris@1912/2005/07.19.21.02.32
%@issn 1712-7971
%F 8455
%T Evaluation of Radarsat for land use and land cover in the Southwestern brazilian Amazon State of acre
%D 1998
%8 Dec.
%9 journal article
%A Kux, Hermann Johann Heinrich,
%A Santos, João Roberto dos,
%A Ahern, Frank J.,
%A Pietsch, R. W.,
%A Pardi Lacruz, Maria Silvia,
%@affiliation Instituto Nacional de Pesquisas Espaciais, Divisão de Sensoriamento Remoto (INPE, DSR)
%B Canadian Journal of Remote Sensing
%V 24
%N 4
%P 350-359
%K ESTUDOS INTEGRADOS DO MEIO AMBIENTE, ESTUDOS INTEGRADOS DO MEIO AMBIENTE, Acre (Estado), Radarsat, imagens de radar, calibracao, mapeador tematico (Landsat), imagens Landsat, desmatamento, desflorestamento, uso da terra.
%X In order tofacilitate the incorporation of RADARSAT data into on-going programs for monitoring land use and land cover changes in the Brazilian portion of the Amazon basin, a rapid assessment of the visibility and detectability of features of interest was carried out and on the dynamics of change of thesefeatures with time. RADARSAT images were acquired for five dates in 1996: one in April, one in May and three in October These have been analyzed qualitatively and quantitatively,in conjunction with aerial photographs. Field trips were made concomitantly with both first and second series of RADARSAT overpasses; a Landsat - TM image was obtained from June 14, 1996. The most significant findings were: Visual interpretation of Standard Mode RADARSAT images could be used to detect urban areas, streams, and the general pattern of deforestation resultingfrom human settlement on all five images. The contrast between deforested areas and the primary forest was variable, being the greatest on an afternoon overpass at the end of the dry season, when no rain was recorded in the previous 24 hours. Compared to the undisturbed or minimally disturbed upland rainforest, anthropic areas were observed to exhibit much larger temporal variations in backscatter (up to 4 dB in the case of recently-burned forest); under the proper conditions of recent precipitation at the end of the dry season, RADARSAT imagery appears to be a very sensitive indicator of forests which have been recently burned. With C-HH radar the use of multitemporal data will increase the reliability of detecting and mapping deforestation; the ideal two date combination would be to obtain one image under very dry conditions and a second image following a recent rainfall.
%@language en
%3 INPE 7133.pdf