Latest Contributions by grahamlangley-edwards

Eric,      That worked perfectly, and looks great at all scales.  Thanks for the detailed workflow, and for all your help.  Regards, Graham ... View more

Hi Eric, thanks for your reply.  The hillshade does look fine if I zoom in, however, pyramids are listed as absent under Raster Information in the hillshade's Source tab, and a resampling method is not indicated. I mosaicked the original DEM layer through the Mosaic to New Raster tool, importing the spatial reference from the original DEM's.  The spatial reference was originally in WGS_1984, while the data frame was in ED_1950_UTM_Zone_30N, so I used the Project Raster tool to reproject the mosaicked DEM's into ED_1950_UTM_Zone_30N.  I'm not sure what you mean by "unit of the pixel (z unit) data".  The cell size (X,Y) is 0.00083333333, 0.00083333333.  Pixel type - signed integer, pixel depth - 16 bit, pyramids are level 5; nearest neighbor, if that helps. I tried to mosaic through the Mosaic Dataset tool, I created the geodatabase and added the layers using the Add Rasters to Mosaic Dataset tool, but the output was just solid gray.  I got around this last time by changing the stretch to percent clip, but when I try to do that this time, it would not let me compute the histograms and nothing changed.  Also, I did go into the mosaic dataset properties after I created the dataset and transformed the geographic coordinate system, like it says in the ArcGIS help window about Create Mosaic Datasets, so I think that should be all good.  Hopefully there is a way around this. Thank you for all your help, I really appreciate it, Graham ... View more

Thanks, Melita, for your help.  I used the project raster tool to define the linear units, but the hillshade comes out the same.  I also tried to use the correct z value on the original DEM that I had not used the project raster tool on, and get just a solid color without any hillshade.  I tried every combination of feet or meters for the z value, and tried using z values with the reprojected DEM as well, but I just keep getting a solid color with no texture.  Not really sure what to do at this point, any suggestions?? Thanks again, Graham ... View more