CAD tip # 9302:

Question

CAD

% platform category

How to change elevation units in a map or GIS source?

You got GIS data in a SHP format or another data source - also in AutoCAD, where the geometry (e.g. 3D lines representing edges of a river) is stored in meters for X,Y and in millimeters for Z elevations (e.g. 254567). For further processing, you need to convert the Z-elevations of the lines to meters, i.e. scale them down by 1000.

You cannot use map queries to easily modify geometry in this way but you can elegantly solve this problem using import (the MAPIMPORT command) to AutoCAD entities. Select all imported entities, make a block of them - with a non-uniform scale in XYZ axes, and set scale 0.001 for the Z-axis. Finally explode the block and use the MAPEXPORT command to export the exploded geometry back to the 3D SHP format.

It is simple and quick.

MapCivil

*CAD

19.6.2013 13254×

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applies to: AutoCAD Map 3D · Civil 3D ·

See also:
Tip 14620:	Converting object data (OD) to XData (XD) in AutoCAD Map 3D.
Tip 13873:	How to load GeoJSON data into AutoCAD, Map, Civil 3D, Infraworks?
Tip 13604:	Importing points from a Shape file as symbols/blocks mapped to object data.
Tip 12988:	Where are Autodesk Infraworks building, road and terrain models loaded from?
Tip 9698:	Data formats supported in Autodesk InfraWorks 360.

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