我国南方红壤分布区1:20万水土流失遥感调查方法探讨

介绍了水土流失区土壤流失1:20万比例尺遥感调查过程,建立了权重模型和判别条件,可用来评估土壤流失强度。认为所获得的 Landsat TM3,4,7波段的假彩色合成影像是解译和识别影响因子的主要手段。在流失区面积估测中,利用大比例尺航片,解译量算流失区中的“非流失区系数”,通过非流失区系数扣除,可大大提高面积量算的精度。

Discussion on Soil-erosion Investigation (1:200000) with Remote Sensing in Laterite Terrain of Southern China

 The procedures on soil-erosion investigation in laterite area at scale of 1:200000 with remote sensing are concluded in this paper.The study strategy,weighted model by experts and discrimination condition to be developed are available for the estimation of soil erosion intensity in other laterite terrain.It is suggested in the paper that the colour composite image with the Landsat TM bands 3,4 and 7 to be acquired in March and April is key for the in- terpretation and identification of the affect factors.In the estimation of erosion area,the “unerosion area coefficents” can be obtained through the interpretation of larger scale airphoto and then the accuracy of the area estimation is largely increased by unerosion area eliminated.