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I have several adjacent DEM files and would like to combine them into a mosaic and then export to DEM and TXT. I know a Windows solution is to use MICRODEM but before installing Windows 7 I would like to know if there is a Mac (OSX) based option.

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you can use MICRODEM if you use Parallels for Mac - parallels.com/products/desktop (Has worked flawlessly for ArcGIS on the Mac for years.) – Mapperz♦ Mar 20 at 0:29

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Try gdal_merge. You can grab the GDAL framework from William Kyngesburye's website.

Instructions for utilizing gdal_merge can be found here.

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why MICRODEM with Parallels when you have many native possibilities on Mac ? .

Applications:

in the shell:

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