Technical solutions for converting a cad planning chart to a MapInfo tab and esri shp format data

Recently, due to the needs of the project, you need to register the content in the planning map to a map with a standard geographic coordinate system (WGS84). After many attempts, after many detours, finally, we found a feasible method.
Write it here and discuss it with you.

As we all know, we can purchase the Electronic Map Data (WGS84. However, the planning charts of planning departments are usually in CAD format. To integrate them together, data conversion is essential. Generally, when drawing a cad planning chart, we all refer to a coordinate system, so we only need to determine the control points during the conversion.

I will describe the basic process below. Some of the steps refer to the successful experiences of netizens.
1. convert a cad planning diagram (*. DWG) to a DXF file in AutoCAD R12/13 format.
Generally, this step can be completed by saving AutoCAD or Autodesk Map as a file. However, in actual operations, I found that when the file is saved as a lower version of the DXF file, CAD always does not respond, and then die.
Here, we recommend the amethyst cadwizz software, http://www.cadwizz.com/. although it is a simplified version, it does not affect the conversion of our input files. Easy to use. Convert it to the DXF file in R13/R12 format.

2. Use the import function in MapInfo

Before conversion, you must first know the exact Cartesian coordinate values of the two points in the image and Their longitude and latitude coordinates.. These two points are best located in the lower left corner of the graph and near the upper right corner. 

When usedMapInfoProvided"Import table"Function, SetAutoCADOfDXFFile inMapInfoOpen,MapInfoCanDXFFile to reset the projection, and coordinate the transformation. IfDXFIf the graphic file contains the property informationMapInfoYou can transfer the original property informationMapInfoMedium.

Select the projection method of the new map file to be generated,Input DXF The plane coordinate value of two points in the graphic file and the corresponding latitude and longitude coordinate value. Press " OK " After, MapInfo The non-earth projection DXF Graphics files are converted into Earth-projected MapInfo Map, and locate the map to the corresponding Earth space, so that the space object on the map has the actual latitude and longitude coordinate value .
If the user's DXF All the graphic objects on the graphic file already have the Cartesian coordinate values of the plane equal to the longitude and latitude coordinates under the earth projection, the conversion process will be simpler. DXF The projection of a graphic file is changed MapInfo Earth projection.
3. perform projection conversion during import and determine the control points.

4. Processing ing ....

5. Now the switch is successful. Congratulations!

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