MODIS及ASTER卫星数据在林火面积估算中的应用

Retrieval Sub-pixel Fire Area with MODIS and ASTER Data

用于火点监测的MODIS数据的分辨率是1km,不可避免地存在有混合像元。本文使用Dozier提出的方法,利用卫星数据不同波段对高温目标的不同响应来获取子像素火点温度及面积,并使用同时相高分辨率的ASTER数据进行了验证。结果表明在背景温度估计准确的情况下,MODIS数据可以比较准确地获得子像素火点的面积,对于判断火情火势具有重要意义。

There exist mixing pixels due to the low spatial resolution of MODIS data （1km）. Dozier （1981） proposed a method that used the different responses of NOAA/AVHRR bands to high temperature target and retrieved the sub- pixel fire temperature and area. In this research Dozier＇s method was used to retrieve MODIS sub- pixel fire area and temperature, and the result was validated by ASTER data that has a high resolution （30m）. The result showed that this method did well in estimating fire area.