Abstract
We made the soil organic matter content (hereinafter referred to as O.M.) map of Obihiro Area, Hokkaido, using Landsat TM data. The aim of this paper is to present a making method of the map. The O.M. of each site is derived from the correlation between measured O.M. in the field and CCT count of TM band 3. The O.M. of vegetation-covered cropland is estimated from CCT count of TM band 3 on the soil line transformed by the soil index method (Fukuhara et al., 1979) . The map consists of 18 sheets and covers whole cropland of Obihiro Area (1, 083, 000ha) . The map is characterized by two points as follows ; (i) grid cell size is 25m×25m, (ii) the O.M. is deviled in to 7 classes and shown on 1: 50, 000 topographical maps in 7 colors.
