cropping .sid ortho imagery files in GM?

GeraldFordGeraldFord Global Mapper UserPosts: 8
edited January 2012 in Raster Data
Hi all,

Is it possible to edit .sid files in Global Mapper? I have several .sid files with black chunks i need croppoed out, but I dont want to lose the geospatial referencing by exporting and editing .tif files. So it a nutshell, is there some way to 'mask off' the black areas in these .sid files?

Thanks!
G

Comments

  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited January 2012
    You can easily mask off those black areas either by cropping to a polygon on the Cropping tab of the Options dialog for the layer or just setting up transparency for the layer. You can then export to a new file and maintain all of the geo-referencing. The one limitation is you can't create a new MrSID file, so you would have to export to another image format, like ECW or JPEG2000 which offer comparable compression but are more open formats.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.globalmapper.com
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