The data includes six primary types and 38 secondary types, including woodland, grassland, wetland, cultivated land, artificial surface and others, with a scale of 1:250000. The data reflects the land cover situation of Xinjiang in 2000. Combined with the TM data of land use, grassland and land cover in Xinjiang with the resolution of 1:1:1 million in 2005, the land cover and land cover in Xinjiang are less than 100 000 meters To provide scientific data support for land use research and national macro decision-making in Xinjiang.
|collect time||2000/01/01 - 2000/12/31|
|collect place||Xinjiang Uygur Autonomous Region|
|data size||286.7 MB|
In 2000, Xinjiang land cover data was independently completed by Xinjiang Institute of ecology and geography, Chinese Academy of Sciences, based on 1:1 million Xinjiang land use data and remote sensing classification data, using full digital method. The main data sources are: 1.1:1 million Xinjiang land use data; 2.30 m resolution of 2005 TM data; 3.30 m resolution of DEM data; 4 The auxiliary data are 1:1 million Xinjiang grassland resource data (vector) and 1:1 million Xinjiang woodland resource data (vector), all of which come from the accumulation of scientific research achievements over the years.
Collect TM image data within 1-2 years before and after 2000, overlay DEM data with spatial grid accuracy no less than 30 meters, and generate Orthophoto Image. Ecognition, a remote sensing image analysis software, is used to interpret the orthophoto, add artificial visual interpretation, cooperate with the field investigation results to verify the interpretation accuracy, and generate land cover data. The boundary of administrative division is subject to the administrative boundary on the 1:100000 topographic map; the field calibration sampling rate of each land cover category is 50 points per image block, more than 5000 points per area; the time interval between field survey and image acquisition is less than 1 year; the spatial positioning accuracy of field calibration is better than 15m; the sampling photos account for more than 10% of the sampling points.
The total precision of the first class, the second class, the forest and the shrub, the other single class, the climate zone, the change detection, the second class and the single class is 95%, 85%, 65%, 85%, 65%, 85%, 72% and 42%, respectively.
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