Cartografía multitemporal de quemas e incendios forestales en Bolivia: Detección y validación post-incendio

Abstract

In this study we present the quantification of areas affected by fires and burns for assessing damage, the location of sites higher pressure and identify patterns of forest conversion through teledetection. To build the trajectories of historical fires in Bolivia use the product of burned areas MCD45A1 of MODIS sensor (Moderate Resolution Imaging Spectroradiometer) with a resolution of 500 m for a series of eleven years (2000-2010). The validation of this analysis was done using the normalized ratio of burning (NBR) to Landsat TM images with a resolution of 30 m, allowing classification of burned scars. We selected regions of the Amazon and Chiquitania to estimate the accuracy in detection. The monitoring of burned areas in Bolivia for the series of eleven years showed that 22,012,910 hectares were burned in total, of which 20% (4,287,512 ha) are forest fires and most of the burning surfaces are grassland and savanna, greatly surpassing the estimates before this study. Historically, fires occurred over the years 2007 and 2010, covering 3.691.815 ha surfaces and 4.343.156 ha, respectively. The overall accuracy in detection was 81%, and as to the accuracy of the magnitude of the burned areas was between 63% and 57% for the Chiquitania and the Amazon, respectively.

In this study we present the quantification of areas affected by fires and burns for assessing damage, the location of sites higher pressure and identify patterns of forest conversion through teledetection. To build the trajectories of historical fires in Bolivia use the product of burned areas MCD45A1 of MODIS sensor (Moderate Resolution Imaging Spectroradiometer) with a resolution of 500 m for a series of eleven years (2000-2010). The validation of this analysis was done using the normalized ratio of burning (NBR) to Landsat TM images with a resolution of 30 m, allowing classification of burned scars. We selected regions of the Amazon and Chiquitania to estimate the accuracy in detection. The monitoring of burned areas in Bolivia for the series of eleven years showed that 22,012,910 hectares were burned in total, of which 20% (4,287,512 ha) are forest fires and most of the burning surfaces are grassland and savanna, greatly surpassing the estimates before this study. Historically, fires occurred over the years 2007 and 2010, covering 3.691.815 ha surfaces and 4.343.156 ha, respectively. The overall accuracy in detection was 81%, and as to the accuracy of the magnitude of the burned areas was between 63% and 57% for the Chiquitania and the Amazon, respectively.