On 17 August 2011 13:10, Mike O'Toole <[email protected]> wrote:
> Thank you for the quick response. I updated and unfortunately I get the same 
> results. I ran the code multiple times in a row and saw the following error 
> intermittently.
>
> Here is the tif I was testing with. Can you confirm this works for you?
>

Hi Mike,

OK - two problems here: one mine, one yours :)

My problem is the null pointer exception that you are seeing sometimes
with JMapPane / JMapFrame. There is a separate discussion running
about this on the list at the moment. I had hoped that I'd fixed it
with today's code changes but obviously not well enough.

Your problem is that you are trying to display a continuously valued
DEM, so the simple greyscale code in ImageLab will not work. It
expects byte values, not doubles - hence the black image.  You need to
create a style based on a gradient or cut-points. You can see several
examples (expressed as XML rather than programmatic SLD) in the
GeoServer SLD Cookbook:

http://docs.geoserver.org/stable/en/user/styling/sld-cookbook/rasters.html

Michael

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