Generating time-series land cover/land use dataset of SE Asia

1)建立了中南半岛半岛20世纪70、80和90年代的土地利用/土地覆盖时间序列数据集，其中部分地区由于卫星云图的遮挡而没有数据。2）划分了森林（万年青、落叶）、稻田、农田、草地/荒地、城市化地区/人工建筑物和水体等土地利用/土地覆盖类型。网格单元的大小因土地覆被/土地利用类别而异。3）验证结果表明，分类精度在80%以上。森林具有相对较高的准确性，而农田和草地/荒地相对较差。为了进行验证，生成了10个大小约为180公里乘180公里的检查点，在这些检查点上，主要借助许多外部知识和信息，如现有的地形图和土地利用图，通过目视判读进行详细和可靠的土地覆盖/土地利用分类。为这些检查点生成的时间序列土地利用/土地覆盖数据集。4）为了部分检查，地面照片通过千叶大学开发的软件存档在数据库中。5）以系统的方式开发方法和软件，用于使用Landsat MSS和TM、NOAA AVHRR数据生成时间序列土地利用/土地覆盖数据集。典型的例子是自动镶嵌系统和土地使用/土地覆盖物分类系统。6）目前正在编辑所有数据，并制作有关文件，以光盘形式和在网上出版。

1) Time series dataset of land use/land cover in 1970's, 1980's and 1990's for Indochina Peninsula are developed, though here are several areas with no data due to cloud cover of satellite imagery.2) Land use/land cover classes consisting of forest (evergreen, deciduous), paddy field, crop field, grassland/barren land, urbanized area/artificial structures and water body are discriminated. Size of grid cells are different by land cover/land use classes. 1km ^* 1km for forest and 500m ^* 500m for the others.3) Validation reveals that the overall classification accuracy is more than 80%. Forest have relatively higher accuracy, while crop field and grassland/barren land are relatively poorly discriminated. For the validation, 10 check sites with the size of approximately 180km by 180km are generated where detailed and reliable land cover/land useclassifications are conducted mainly by visual interpretation with aid of many external knowledge and information such as existing topo-maps and land use maps. Time-series land use/land cover dataset generated for these check sites.4) For partial check, ground-based photos are archived in a database by software developed by Chiba University.5) Methodologies and software are developed in a systematic manner for generating time-series land use/land cover dataset using Landsat MSS and TM,NOAA AVHRR data. Typical example are automated mosaic system and land use/land cover classification system.6) All data are now being edited and related documents are being generated for publishing as a CD-ROM and over the net.