This data mainly reflects the current situation of land use in Xinjiang around 2010. Data file name: "Xinjiang 1:250000 land use data products (2010)" Based on TM data in about 1-2 years in 2010, vector data produced through reprojection, geometric correction, manual interpretation and other work, the data production time is 2009, the scale is 1:250000, the county and city codes are subject to the national administrative division code implemented in 1998, and the land classification system is based on the "national resources and environment macro remote sensing investigation project team" established by the Chinese Academy of Sciences The land classification system of Chinese Academy of Sciences is the standard, which is divided into 6 first class and 24 second class.
|collect time||2010/01/01 - 2010/12/31|
|data size||127.7 MB|
The data comes from Landsat TM and ETM image data downloaded from the website of the University of Maryland around the 2010's in Xinjiang and 1:100000 topographic map published in the 1970s in China collected by the Xinjiang branch of the Chinese Academy of Sciences.
Firstly, the TM data is screened, and the cloud coverage ratio is less than 4%, or the main ground objects are less covered. Combined with 1:100000 topographic map, the selected image is geometrically corrected, then spliced, and leveled. Finally, it becomes a vectorized product, and each TM data is visually interpreted and manually vectorized by professionals according to the interpretation mark and classification system to generate a coverage grid Then, ArcGIS software is used to convert coverage data into SHP data, and cost data is generated through projection conversion.
This data is processed by the geographic information and cartography professionals of Xinjiang Institute of ecology and geography, Chinese Academy of Sciences. From the scanning of paper data, screening of image data, precise geometric correction, splicing, color equalization to digital vectorization and manual interpretation, the whole operation process complies with the relevant national standards, and the digital error is controlled within 2 pixels, ensuring the vectorization boundary The boundary between the line and the topographic map is exactly the same. The vector data truly reflects the shape and attribute information of the features, and the accuracy of the data is as high as 99%.
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