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Mapping and monitoring deforestation areas in Amazon region using semi-automatic classification of Landsat Thematic Mapper images

机译:使用Landsat Thematic Mapper图像的半自动分类来绘制和监视亚马逊地区的森林砍伐区域

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The INPE's operational project (PRODES) to estimate annual gross deforestation in Amazon region based on manual analysis of 229 TM images faces several problems during the interpretation process (variable scales of different scenes, closing polygons in the interpretation maps due to complexity of deforestation pattern). Thus, the availability of results in a digital format has been restricted. This authors propose an approach to map and monitor deforested areas in the Amazon using digital analysis of TM/Landsat. This methodology will automate the PRODES manual interpretation tasks and will build a GIS database. This approach was developed and validated using TM image Path 231/067 (1997, 1998, and 1999) over Rondonia. The original TM bands were converted to vegetation, soil, and shade fraction images applying a linear mixing model. The selected fraction image was segmented using a region growing algorithm, classified using a per region clustering algorithm and the results were manually edited to generate the final map. Results showed 10,252 km/sup 2/ of deforestation up to 1997; increments in the deforested area for 1998 and 1999 were 695 and 388 km/sup 2/, respectively. A total of 1,149 km/sup 2/ was burned in 1998 (only 16% in recent clear cut areas). The proposed methodology is feasible and very useful for global studies using fine resolution satellite data such as Landsat TM.
机译:INPE的运营项目(PRODES)基于对229 TM图像的手动分析来估计亚马逊地区的年度森林砍伐总量,在解释过程中遇到了几个问题(不同场景的比例可变,由于森林砍伐模式的复杂性,在解释图中封闭多边形) 。因此,数字格式结果的可用性受到限制。作者提出了一种使用TM / Landsat的数字分析来绘制和监视亚马逊地区森林砍伐区域的方法。这种方法将使PRODES人工解释任务自动化,并将建立一个GIS数据库。该方法是通过Rondonia上的TM图像路径231/067(1997、1998和1999)开发和验证的。应用线性混合模型将原始TM带转换为植被,土壤和阴影分数图像。使用区域增长算法对选定的分数图像进行分割,使用每个区域聚类算法对图像进行分类,然后手动编辑结果以生成最终图。结果显示,到1997年为止,共有10,252 km / sup 2 /的森林砍伐; 1998年和1999年森林砍伐面积的增量分别为695和388 km / sup 2 /。 1998年,总共烧了1,149 km / sup 2 /(在最近的净砍伐面积中只有16%)。所提出的方法是可行的,并且对于使用高分辨率卫星数据(例如Landsat TM)的全球研究非常有用。

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