Global Mapper Pro

Outline forground in ECW

Sorry in advance! I am probably not using the correct terms for this, lol. I have an ECW that basically contains a potato shaped blob of land. I need to get an outline of the landmass (excluding the background) and save that as a shape file. I have attempted to use BBox/Coverages but the outline was very rough and included some of the background and excluded some of the foreground. Any ideas on how I can get an outline of the landmass?


  • To add more information, I have set the ECW so that white (with fuzziness set to 15) is transparent before I used the BBox feature. Everything I wanted to exclude from the BBox feature was transparent but some areas that were transparent were included and other areas that had imagery were excluded. Its almost as if the feature did a rough outline.
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