bmg_bob · Global Mapper Programmer
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If you want Global Mapper to treat the elevations as depth, you will need to set the elevation scale to -1. ALT_MODE governs how the 3D Viewer treats the data. You need to use ELEV_SCALE to modify the values. Something like this should work:
ALT_MODE="ABSOLUTE" ELEV_SCALE="-1.0"In general, the best way to figure out how to code an IMPORT statement is to load your data into Global Mapper, modify the options so that your data is represented as you want it (in this case, use the Alter Elevations tab to set the elevation scale to -1), and then save a workspace. The workspace is a script, so you can look at it in a text editor and copy the IMPORT statement.
If you are exporting vector features to a Shapefile, you have the option to split data into separate files by layer name. You provide the base file name and the layer names get appended to it.
I suggest that you pass this request along to Blue Marble Support via email (email@example.com). They will be able to provide more guidance with regard to your options in the current version of Global Mapper, and open a feature request for new functions that you need. Please include a much detail as you can in the description of what you need. Thanks.