Shulou(Shulou.com)06/03 Report--

The original data can be distinguished between projected and non-projected coordinates, which can be detected by gdal tool. Its resolution is also distinguished by the unit of meter and degree.

If there is a projection coordinate system before the projection transformation, and it is also a projection coordinate system after the projection transformation, or in another case: before the projection transformation is the geographical coordinate system, and after the projection transformation is also the geographic coordinate system, and the units of the coordinates are consistent, then the resolution is basically not transformed, and the resolution before the transformation can be used. If the geographic coordinate system is before the transformation and the projection coordinate system is after the projection transformation, assuming that the geographic coordinate system is in degrees and the projection coordinate system is in meters, then the pixel size after projection can be estimated in this way, because the distance of one latitude on the longitude is about 111km, then the resolution after transformation can be multiplied by 111000 by the original resolution. On the contrary, if there is a projection coordinate system before the transformation and a geographic coordinate system after the projection transformation, it is assumed that the geographic coordinate system is in degrees and the projection coordinate system is in meters, and the pixel size after the same projection can be estimated in this way. the resolution after transformation can be divided by 111000 by the original resolution.

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