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在使用arcmap加载usgs hydro1数据的时候,经过处理后就会出现错误。其原网站上是这样说的:
Users of ARC/INFO or ArcView can display the image data directly. However, if a user needs access to the actual pixel values for analysis in ARC/INFO the image must be converted to an ARC/INFO grid with the command IMAGEGRID. IMAGEGRID does not support conversion of signed image data, therefore the negative 16-bit image values will not be interpreted correctly. After running IMAGEGRID, an easy fix can be accomplished using the following formula in GRID:
out_grid = con(in_grid >= 32768, in_grid - 65536, in_grid)
The converted grid will then have the negative values properly represented, and the statistics of the grid should match those listed in the .stx file. If desired, the -9999 ocean mask values in the grid could then be set to NODATA with the SETNULL function.
但是我根本不知道这是啥命令,也查不到。这是什么意思,大家遇到这种情况吗?
谢谢,各位
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