THE DETECTION AND EVALUATION OF UNUSED AGRICULTURAL LAND USING LANDSAT-8 OLI AND DEM IN KUSHIRO RIVER WATERSHED, JAPAN

摘要

The objectives of our study are to 1) evaluate the classification accuracy of agricultural area including unused agricultural land (UAL), and 2) analyze the distributional characteristics of UAL using DEM-data and surrounding LULC-map. We classified agricultural land into four categories including UAL, grassland, cultivation and forest using Landsat-8/OLI Surface Reflectance, NDVI and polygon of agricultural field in Tsurui Village. Further, we classified all agricultural land in the whole of Kushiro River basin using the best classification method. Then, we calculated the percentage of UAL for each polygon of agricultural field. Finally, we examined the relationship between distribution of UAL and the topographical and LULC conditions.