Raster – How to Merge Single Band and Multi Band Color Images?

aerial photographyraster

I have two color images (orthophotomaps). One is only 1-band with color map and second is with 3-bands.

How can I merge them with any FOSS tools or ArcGIS?

Best Answer

Have you looked at using the Composite Bands tool in arctoolbox?

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[GIS] How to use gdal_calc.py for multi-band images

To calculate a grey-scale from the same input file using different bands u can open the file multiple times and define the band which you want to use with --A_band=n.

See my example for calculating the NDVI from a satellite image with red at band 1 and near-infrared at band 4.

gdal_calc.py -A input.tif --A_band=1 -B input.tif --B_band=4 --outfile=ndvi.tif --calc="((B-A)/(B+A))"

You can see that I used input.tif for A and B. See documentation of gdal_calc.py: http://www.gdal.org/gdal_calc.html

[GIS] Merge tiffs into a single multi banded tiff

You are getting a blank image because you are not copying any data into the final output. The creatonly flag does just that. It creates a blank image of the right size (see the documentation). So your inputs in the warp operation should not be the blank output of the -creatonly operation (as that will obviously be blank as you discovered).

See here for an example of using gdal_warp for merging. An alternative to this approach would be to make a VRT and then warp that.

gdal_merge loads the whole raster(s) into memory for speed whereas warp uses tiling to do the operation piecemeal (so less memory overhead). A VRT is just a virtual raster - an xml representation of the result that you can 'solidify' into a real raster (if you need to) using translate or warp.

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Related Solutions

[GIS] How to use gdal_calc.py for multi-band images

[GIS] Merge tiffs into a single multi banded tiff

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