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Combining 2 large raster in Arc Gis

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#1
Evangelyn

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Hi. I'm new in ArcMap and I have ArcGIS 9.1. I'm strugling to combine 2 raster layer with 50k unique records each using the combine function in raster calculator. Searches on the internet tells me it might be that the unique combination exceeds 10M . Is there a way around it?
And by the way I need to be able to export this in Ms Access afterwards so I can post process.
Many thanks in advance for your help Cartotalk peeps. :D

#2
Evangelyn

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Hi. I'm new in ArcMap and I have ArcGIS 9.1. I'm strugling to combine 2 raster layer with 50k unique records each using the combine function in raster calculator. Searches on the internet tells me it might be that the unique combination exceeds 10M . Is there a way around it?
And by the way I need to be able to export this in Ms Access afterwards so I can post process.
Many thanks in advance for your help Cartotalk peeps. :D


I've converted one raster to points shapefile and use extract values to points. This seems to be going on forever as I have 8M points. Does anybody know if this will work and will I be able to export the whole result to a personal deodatabase file? Thanks.

#3
frax

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Maybe process the values in tiles?
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#4
Sab

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I suggest using GRASS or QGIS (Gdal plugin). It is Free and Open Source and extremely fast for any raster calculation.

Edited by Sab, 19 September 2011 - 01:48 PM.


#5
French cartographer

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I suggest using GRASS. It is Free and Open Source and extremely fast for any raster calculation.


I'm agree with Sab. QGIS is easy to use and allows to do this operation. ;)




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