Merging two maps with different scales
uunalgm
Global Mapper User
Hi,
I want to merge two maps on global mapper. One of these maps cover a smaller region and the scale of this is 1/1000.
The background map is SRTM elevation data. I want to export the elevation data as a single *.map file, and the map should contain the 1/1000 map elevation data on the smaller interior part and SRTM elevation data on the remaining areas.
How is this possible with Global Mapper?
I attached the workspace in this e*mail.
Kind regards,
Utku
I want to merge two maps on global mapper. One of these maps cover a smaller region and the scale of this is 1/1000.
The background map is SRTM elevation data. I want to export the elevation data as a single *.map file, and the map should contain the 1/1000 map elevation data on the smaller interior part and SRTM elevation data on the remaining areas.
How is this possible with Global Mapper?
I attached the workspace in this e*mail.
Kind regards,
Utku
Comments
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Utku,
Just load the lower resolution layer first, then the more detailed map on top (or re-order in the Control Center). To improve the edge blending you might use feathering on the Feathering tab of the Options dialog for the more detailed layer. Then just use File->Export->Export Elevation Data to export to a new grid file. The default resolution will be that of the more detailed layer, so the lower resolution SRTM will be oversampled to match the resolution in the areas where the more detailed data doesn't exist.
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation -
Mike, will the levels of the more detailed layer take precedence over those of the less detailed layer, irrespective of which is higher or lower?
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No, the layer on top (lower in the Control Center, which is higher in the draw order) will take precedence, even if there is a lower resolution layer on top.
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation -
OK thanks. So whether I want to add a hill or dig out a lake in an existing terrain, if the modification is a lower layer in the Control centre, it will determine the output terrain. Thanks Mike.
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