CBERS-1数据评价及在荒漠化监测中的应用

CBERS-1数据的单波段中存在斑点或条带噪音,可经过降噪处理部分解决;波段数据合成图像主要问题是波段间存在像元的水平位移,位移误差可通过波段配准来解决。通过对具有相似波段的TM数据进行比较,CBERS-1数据像元分辨率高于TM,合成图像对地物的判读更清楚,数据可应用于较大比例尺制图,但CBERS-1数据合成图像的色调不及TM鲜艳。经一定处理后的影像数据,建立解译指标,进行土地利用/覆被信息提取,获得了古浪项目区土地利用和荒漠化现状统计数据,结果表明,古浪县处于中度到重度荒漠化之间。

Processing and Application Evaluation of CBERS-1 Data in Desertification Monitoring

In this paper, the application effect of CBERS-1 data in desertification monitoring in Northwest China was analyzed and evaluated. The wavelength scopes of ban 2,3 and 4 of CBERS-1 data were similar to the same bands of TM data, so it was comparable with TM data. CBERS-1 composition images clearer displayed features of ground objects than TM images because of its higher spatial resolution compared with TM data. The results showed that CAERS-1 data may be applied to landuse mapping and desertification monitoring in desertified regions after deterministic processing. There had some speckles or stripe noises in each single band that can be partially reduced by noise-filtrating processing, and the displacements that can be eliminated through band matching. The satisfactory effects were gotten when above-mentioned image processing techniques were applied to survey of landuse and desertification of experiment region in Gulang County, Gansu Province.