At 10.0, the Map Algebra merge function was abolished in favor of Mosaic and Mosaic To New Raster.Mosaic and the Mosaic To New Raster model tool are very functional -- but these functions are not available inside the map algebra syntax for efficient use with the Raster Calculator and Python.Funny that Mosaic Dataset functions support this - but not arcpy map algebra.The two workarounds I know of are 1) use Con and IsNull to grab the first non-NoData cell or 2) use SOMA or MOMA.Please bring it back as a tool (maybe something like Merge Rasters in the Local toolset?)
Still want it. Maybe add "FIRST" and "LAST" to Cell Statistics? This is an alternate workflow to the Mosaic tools, which are limited in their support of the GP environment settings.
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