This dataset is the result of the processing of the SRTM data of USGS/NASA by the International Consultative Organization on Agriculture (CGIAR). It is of higher quality than the original data and was updated in November 2018. The data is divided into 5 degrees * 5 degrees of longitude and latitude difference. The number of row and column in each data is 6000, and the size of each cell is 0.000833333333 * 0.0008333333 (decimal degree). It is about 90 meters near the equator. WGS84 ellipsoidal geographic coordinate system is used for spatial reference of data. The data covers not only the upper reaches of the Yangtze River, but also the whole country.
The data in this dataset are organized according to the row number and column number after the latitude and longitude difference of 5 degrees * 5 degrees. Row number is divided every 5 degrees from west longitude 180 to east, and column number is divided every 5 degrees from north latitude 60 to south. Each data is named as follows: e.g. srtm_ 58_ 07.tif。 Where srtm is the data set name; 58 is the column number, indicating that the data range is between 105° -110 ° E; 07 is the column number, indicating that the data range is between 25° -30 ° N; Tif is the data format. Users can calculate the map frames to download data according to the geographical scope of the research area.
Tian, Y. (2022). CGIAR SRTM V4 90m Digital Elevation Model (DEM) data in the upper reaches of the Yangtze River and China. Upper Yangtze River Scientific Data Center, (Download the reference：
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| East: 140.00 | West: 70.00 |
|---|---|
| South: 15.00 | North: 55.00 |
