06-11-2018 01:27 AM
For display purpose in ERDAS Apollo, we've converted the elevation data in GeoTIFF floating points format to ECW raster image (8bits format). After creating WMS, we found out a lot of white holes when zooming in the datasets.
We've checked this dataset using the desktop software, ERDAS Imagine and there are no white holes inside the data.
I've attached the sample of white holes appears on elevation data.
06-12-2018 03:07 AM
It looks like the "0" values are treated as null data during the compression process and/or by the APOLLO service.
Which APOLLO service are you using? How have you converted your GeoTiff into ECW?
06-12-2018 07:04 AM
We're consuming WMS to display the dataset using Geomedia Desktop and we use Global Mapper to convert GeoTiff into ECW. The setting that we used as attached file.
06-12-2018 07:46 AM - edited 06-14-2018 11:59 PM
But in general, the advise is to add a transparency layer to the ECW (and avoid "0"values if you use the legacy catalog WMS).
06-14-2018 08:41 PM
If you are using the Legacy WMS for the provider you can set the "NULL Values" property for the Aggregate to -1 (actually setting it to any value that is out of range will work) to disable null values in ECW files.
When you do this only the regions defined as transparent in the ECW will appear as transparent.