Download Globe GIS Data:
If it locates in China, you can download from here:
Download files with img format, then drop into Global Mapper. It will generate contour line with different formats. Export Vector format: DWG.
*Rhino can generate a mesh landform, if it is a DXF Mesh file.
For low accuracy requirement, we can use the following Rhino Plugins：
CADTOEARTHPart 2 – If you have the topography information: Case 1 – Contours with Z-value ( but especially broken lines): Solution:Divide the contour line by equal distance and get the corresponding elevation point to solve the line breakage problem. Grasshopper Script as shown below: Case 2 – Elevation points with z-values: Try to get the elevation points first: Use command “SelBlockInstance” to explode the block. Then you will be able to select all elevation points. Analysis of Topography Buy Grasshopper Scripts mentioned in this article, including 2 other topography analysis scripts(show above).