Add rasters to mosaic dataset returns dem with -32768 and 32767 values

[StevenWernke]

I have six ASTER GDEM tiles, projected to Mercator (World), saved as grid format, 16 bit signed integer files.  All are clean (no sinks, holes, no negative values, etc).

I want to mosaic them to a single DEM, but when I try to add them to a mosaic dataset, the resulting raster has values that include a range from -32768 to 32767.

Any ideas?  I've tried changing environmental settings, and a number of other things, but can't seem to figure out why it is returning a dem with junk cell values.

Thanks for any tips.

[KyleShannon]

Are there actual cells with those values?  Try computing statistics on them.

[RichardLaw1]

Have you checked your pixel type? Sounds like your mosaic raster is attempting to become 32-bit unsigned. Given your 16-bit inputs, make your output 16-bit too.

[EricRice]

Steve,

You have to calculate statistics on the mosaic dataset. 

Regards,
Eric

[MariekeZon]

I just solved this issue by calculating the histograms in the symbology menu of layer properties.