Based on the reconnaissance and analysis technology, the data set is made up
of the reconnaissance and analysis results and the interpretation of remote
sensing, and the spatial reference (projection and coordinate system) is
Albers. The survey results images are derived and read in software ArcMap,
using a variety of tools for a map, based on the scale of standard framing way
of interpretation, the formation of vector data is formed into the file.
Finally, the data is exported in the vector file. The hydrologic data of
river, lake, reservoir and the basin range were extracted from the file
library to build the hydrologic database of Songliao basin.