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I have two grids.

One, call it A, is 4320x2160 cells and spans the whole globe.

The other, call it B is 8640x3432 and spans the circumference of the globe, but is clipped toward mid-latitudes.

Both files are in ArcGrid ASCII format. The clipped file has a header of:

ncols         8640
nrows         3432
xllcorner     -180
yllcorner     -58
cellsize      0.0416666666667

Looking at the grids in QGis, I see that the B contains four cells for every cell of A.

I would like to sum each group of four cells in B to create a new grid that overlays directly with A and has a one-to-one correspondence of cells.

Is there a way to do this in Linux using either Python or command line only tools?

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  • Do A and B already line up, or is the 4-to-1 ratio only relating to the cell size?
    – Erica
    Aug 6, 2014 at 17:52
  • @Erica, A & B already line up on every other cell, giving the 4-to-1 ratio. Thank you for clarifying.
    – Richard
    Aug 7, 2014 at 2:02

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