The dataset includes aster GDEM data and its mosaic.
Aster global DEM (Aster GDEM) is a global digital elevation data product jointly released by NASA and METI on June 29, 2009, The DEM data is based on the observation results of Terra, a new generation of earth observation satellite of NASA. It is made of 1.3 million stereo image pairs collected by aster (advanced space borne thermal emission and reflection radio meter) sensor. Its coverage exceeds 99% of the earth's land surface. The horizontal accuracy of the data is 30 meters (95% confidence), and the elevation accuracy is 7-14 meters (95% confidence). This data is the third global elevation data, which is significantly higher than the previous SRTM3 DEM and gtopo30 data.
We downloaded the data of Heihe River Basin from NASA data website (http://wish.echo.nasa.gov/api) and redistributed it through this data center. The data distributed by the center completely retains the original appearance of the data without any modification. If you need to know more about the preparation process of Aster GDEM, please refer to the data document of this metadata connection, or directly visit http://www.ersdac.or.jp/gdem/e/3.html or from https://lpdaac.usgs.gov/ to read the documents related to aster global DEM
Aster GDEM is divided into several 1 × 1 degree data blocks in the distribution format of zip compression. Each compressed file includes three files. The file naming format is as follows:
Where XX is the starting latitude and YYY is the starting longitude. _Dem.tif is the DEM data file, and "num.tif" is the data quality file. READEME is the data description file.
In order to facilitate the user's use of data, based on the segmented aster GDEM data, we spliced the fractional SRTM data to prepare the aster GDEM mosaic map of Heihe River Basin, which retains all the original features of Aster GDEM without any resampling. This data includes two files: Heihe ﹣ aster ﹣ GDEM ﹣ mosaic ﹣ dem.img Heihe ﹣ aster ﹣ GDEM ﹣ mosaic ﹣ num.img
The data is stored in ERDAS image format, where the dem.img file is the DEM data file and the num.img file is the data quality file.
|collect time||1999/01/04 - 2009/12/31|
|data size||1.1 GB|
ASTER Global DEM
The data is spliced, and all the original features of Aster GDEM are preserved without any resampling.
Good data quality
|2||黑河流域ASTER GDEM数据集-文档.rar||740.8 kB|
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