GeoTalks Express – Session 15 Questions & Answers

The fifteenth of Blue Marble’s GeoTalks Express online webinar series entitled What’s New in Global Mapper v22, was conducted on September 30th, 2020. During the live session, numerous questions were submitted to the presenters. The following is a list of these questions and the answers provided by Blue Marble’s technical support team.


Can we paint into land use data similar to painting terrain?

The Terrain Painting tool is designed for editing #D gridded data like digital elevation models. If you have a 3D gridded version of your land use data you would be able to edit it with this tool. 

For 2D raster image data editing, I recommend you explore the Raster Reclassify and possibly the Raster Calculator tool to edit and change values in your image layers. 


There’s a query on the Forum: Version 22 strange export behavior – “I just upgraded to 22 and when trying to export a PDF or other formats too, after I select the file name, it keeps asking for it again and again, therefore making it impossible to export anything.


I tried the same workspace export with version 21.1 and it worked normally.” Maybe not for this presentation, but needs looking at and answering.

Thank you for bringing this forum post to our attention. The Global Mapper forum is an informal version of tech support, meaning it is not consistently monitored by members of our team. The Global Mapper Forum is a space for Global Mapper users to share their knowledge and ask and answer questions. If you encounter an issue in the program we recommend you email our technical support team ( with some details on the behavior and your workflow. 

​Are you seeing this export issue that you have noted from the forum? Are you seeing this only in version 22.0? Any details on your data, workflow, and machine setup would be helpful for use to better understand what may be going wrong in the export process. 


We have a license server at the university. I assume it has to be upgraded for v22?

Yes, the network license file on your license server will need to be upgraded to support version 22 of Global Mapper. Please contact our licensing team at with your recent order information to obtain a new license file for your server. 


Is it possible to use the 3d selector by drawing a freehand polygon (i.e. no a rectangle?

The new sweep selection in the 3D view only supports clicking and dragging a rectangular area of selection. The poly select option is still available in the 2D main view. 


On the speed improvement note.  Our 2020 imagery came in for the county. Around .5 TB worth.  I was able to load the entire county worth of new GeoTIFF files at one time.  It took a couple minutes but still.  The whole county, not individual files. 

I am glad to hear you have noted the speed improvements in the new version of Global Mapper and that they are assisting in your workflow. Let us know if you have any other questions or comments!


When digitizing a polyline is there a way to delete the vertices if you make a mistake and then continue to digitize?

Yes, when clicking to digitize a line or area feature you can use the shortcut ctrl + z to undo the placement of the last vertex and then continue digitizing the feature. 


Can you please tell us if you have any improvements to the map layout editor on the roadmap?  Stuff like rotated text, multiple map view elements or vicinity maps, draw shapes (like annotation arrows)?

In the new version 22 of Global Mapper there are no major additions to the map layout editor tool. In the main view of Global Mapper you can create a label layer to edit and rotate individual label features. These edits and position changes will be retained in the map layout editor. 

We do have open tickets relating to some of the functions you noted. Ticket #GM- on adding an option to display multiple data views in the map layout editor, ticket #GM-3847 on adding options to insert reference arrows and callout shapes, and ticket #GM-7779 on rotating text elements in the map layout editor. I have added your requests to these tickets for our development team to take into consideration. 

The chainage tool – can you export the distance to the line for all of the points into a txt file or file for Excel?

The line segments created to connect the points to the line​ appear in a new User Created Features layer in the workspace. Using this new layer, you can export these lines with attribute measurements to any supported vector format, or open the attribute editor and save the attribute table, including the length measurement, to a CSV file that can be opened and manipulated further in Excel. 


For the chainage tool, does that line have to be straight for chainage or could it be, say, a road?

The selected line used with the chainage tool does not need to be a straight line. It can be more complex with turns and more vertices. The line features created connecting the points to the original selected line will always be straight lines measuring the shortest path from the point to the selected line.


Is the chainage measured by great circle or rhumb line?

The distance measurement method for your installation of Global Mapper can be set in Configuration > General > Measure/Units. The option for calculation type are great circle, grid distance, rhumb line.


How to combine two topographic maps, splicing as-buiilt topo features or proposed grading into the base topographic survey.  

You can combine terrain layers with multiple methods using the Combine/Compare Terrain tool in the program. For more manual editing of a terrain layer, try out the new Terrain Painting tool available in version 22 of Global Mapper. 

From the combined or edited terrain data you can apply a shader and hillshade to see relief in the 2D view. You can also generate contour lines for the edited terrain that will help to better describe the area


Will there be tools to edit 3D solid models in the 3D view in the future?

As a GIS program Global Mapper has geared its function toward the editing of gridded terrain layers. These layers can be created, edited and combined in the Global Mapper program. Although the editing takes place in the 2D view the results of editing 3D data can be viewed in the 3D viewer. Our newest tool for editing terrain data is the Terrain Painting tool now available for use in Global Mapper version 22. 

How does V22 handle 8 bit rasters with a color table applied​?

Global Mapper can load and work with 8 band imagery layers with palette values. These images can be used in the Raster Reclassify tool and can be created in certain formats when exporting data


When do we get a smoothing function as in Inverse distance weighted algorithm?

Specific tools in Global Mapper use the inverse distance weighting algorithm to fill gaps in data as this is where the algorithm seems most directly applicable. These tools include elevation grid creation and Terrain Painting. What type of data are you looking to smooth using this method? How would you expect this to work?

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