how to deal with Irregular basemap data

[zhang-yuchi]

Blender and OS versions

Windows 64 ； Blender version：2.93.9

Describe the bug

I imported an irregular basemap, and the elevation is low at the null value of the bounding rectangle of the basemap, which leads to the overall incongruity. Can I change this situation through some parameter adjustments or other suggestions?

How to Reproduce

Here is my digital elevation map and below is the model I imported into BlenderGIS

Error message

[domlysz]

Use the DEM raw data import mode instead of displacement texture