The Ministry of Construction originally prepared the Digital National Land Information. We stored the data into floppy disks and made a personal computer based system for the easy use of the data. Further we implemented the program TOCHI to display the status of land use. This program works on the personal computers, and users can set the various conditions.
To implement this data base, we first assembled the data that had the same first mesh code (in this paper, "mesh" means "grid cell"), and transferred into floppy disks. Secondary, we transformed the expression of each land use area to a ratio to the total area in the third mesh. Moreover, we compressed the data size by changing the ASCII format to binary. We also included altitude data. Finally, we devided all the data into 6 regions, Hokkaidô, Tôhoku, Kantô-Kôshinetsu, Chûbu-Kinki, Chûgoku-Shikoku and Kyushu. Compressing data, we summed the records which had the same mesh code on a border area of cities, towns or villages. The arrangement of records in the file had been mesh-code-ordered. We rearranged these raster-ordered so that TOCHI could display quickly.
We can easily keep, refer and use the Digital National Land Information in floppy disks. We can
also see trend of land use in each region interactively and can easily overlap these information onto
another meshed data (for example, Natural Energy Resources Map in Floppy Disks, NOAA data and
so on).
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