• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Symposium on Remote Sensing of Environment >LAND-USE AND LAND-COVER DYNAMICS MONITORED BY NDVI MULTITEMPORAL ANALYSIS IN A SELECTED SOUTHERN AMAZONIAN AREA (BRAZIL) FOR THE LAST THREE DECADES
【24h】

LAND-USE AND LAND-COVER DYNAMICS MONITORED BY NDVI MULTITEMPORAL ANALYSIS IN A SELECTED SOUTHERN AMAZONIAN AREA (BRAZIL) FOR THE LAST THREE DECADES

机译：在过去三十年中，NDVI Multitempore分析监测土地利用和陆地覆盖动态，在过去三十年中被选定的南亚亚马逊地区（巴西）

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study aims to analyse the dynamics of land-use and land-cover (LULC) in a selected southern Amazonian area (Brazil), monitoring and distinguishing trajectories in NDVI (Normalized Difference Vegetation Index) variations for the last three decades. The area, with a total of 17336 km~2, has been subject to significant LULC changes associated with deforestation progress and use of fire. Considering available Landsat time series, it was selected an image per year from 1984 to 2013 (path/row -231/66), at a particular period of year, atmospherically corrected using LEDAPS tools. NDVIs values were generated for each selected image. Furthermore, the images of 1984 and 2010 still underwent a classification of LULC differentiate five categories: water, forest, secondary/degraded forest, savannah/pasture and crop/bare soil. The trajectories in NDVI variation values were analysed by R software, considering intersections of classified categories. The pixels identified as forests on the images of 1984 and 2010 displayed stable trajectories of NDVI values, with average value 0.824 and coefficient of variation 3.9%. While the pixels of savannah/pasture, which was periodically affected by fire, had an average NDVI value 0.585 and coefficient of variation 15,1%. The main regressive trajectory was the transition "forest to crop/bare soil", identifying 1999 as the starting point in the drop in NDVI values, associated with an increase of the deforested areas. Therefore, the results show distinct trajectories associated with NDVIs and LULC changes that assist in better understanding the dynamics of ecological processes and the human impacts operating in the area.
机译：本研究旨在分析土地利用和陆地覆盖（LULC）在选定的南亚亚马逊地区（巴西）的动态，在过去三十年中，在NDVI（归一化差异植被指数）中的监测和区分轨迹中的轨迹。该地区，总共173.6 km〜2，一直受到与森林砍伐进展和火灾相关的重大策略变化。考虑到可用的Landsat时间序列，从1984年到2013年（路径/行-231/66）选择了每年的图像，在特定的一年中，使用薄杆工具大气纠正。为每个所选图像生成NDVIS值。此外，1984年和2010年的图像仍然经历了LULC的分类区别五类：水，森林，继发/退化的森林，大草原/牧场和作物/裸土壤。考虑到分类类别的交叉点，通过R软件分析了NDVI变化值的轨迹。识别为1984年和2010年图像上的森林的像素显示了NDVI值的稳定轨迹，平均值为0.824，变异系数3.9％。虽然萨凡纳/牧场的像素是周期性地受到火灾影响的，但平均NDVI值为0.585，变异系数15,1％。主要回归轨迹是过渡“森林到作物/裸土”，将1999年识别为NDVI值下降的起点，与森林砍伐区域的增加相关。因此，结果显示了与NDVIS和LULC的不同轨迹，以便更好地理解生态过程的动态和在该地区运行的人体影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号