AutoCAD Map 3D :: 2012 Coordinate System Scale Factors Are Wrong
Jan 2, 2014
I was recently setting up a new install of Civil 3D 2012 and was going to set the default coordinate system to 3TM (CM=114°W) when I realized the scale factor was set to 1.0 at the central meridian.
It should be 0.9999. I checked some others and they are all the same. I also checked the 6TM projection and it is also set to 1 although it should be 0.9992
Below is the WKT(ESRI) out of Civil for EPSG code 3401:
PROJCS["CANA83-10TM115",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.000,298.25722210]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",0.000],PARAMETER["False_Northing",0.000],PARAMETER["Scale_Factor",1.000000000000],PARAMETER["Central_Meridian",-115.00000000000000],PARAMETER["Latitude_Of_Origin",0.00000000000000],UNIT["Meter",1.00000000000000]]
Looking up the .PRJ for EPSG 3401, the published standard is:
PROJCS["NAD83 / Alberta 10-TM (Resource)",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-115],PARAMETER["scale_factor",0.9992],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1]]
Win 7 Enterprise SP1 64 bit
Intel i7 3770 @ 3.40 GHz
16 GB RAM
Civil 3D 2012 SP2
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Jul 11, 2013
When the attached shape file (change soilmu_a_a.txt to .shp) is imported using MAPIMPORT the data aligns with other imported georeferenced raster imagery (said imagery was imported using the MAPIINSERT command). If the same shape file is imported using the data connect tool it shows up in a much different location (see word document).
The drawing coordinate system code is "UTM83-18F" and the data was downloaded from the Web Soil Survey's data download with the identical coordinate system (see attached readme.txt).
I prefer to use the data connect option when importing this type of shape file because I can label them all using a theme and use stylize the data for visualization/presentation.
As an aside, I have found that data connect does not automatically transform data coordinate systems to match your drawing coordinate system as advertised. I've used the edit coordinate system to no avail; however, again when the file is imported using MAPIMPORT and saved as a drawing (with native data coordinate system) and then that drawing is queried from a drawing in a different coordinate system it seems to transform the coordinate system just fine. Is this a problem with data connect?
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Bounding_Coordinates:
West_Bounding_Coordinate: -94.175741 East_Bounding_Coordinate: -84.616261 North_Bounding_Coordinate: 44.589505 South_Bounding_Coordinate: 42.107198 Ellipsoid_Name: Geodetic Reference System 80
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Dim Current1 As Autodesk.Gis.Map.MapApplication
Current1 = Autodesk.Gis.Map.HostMapApplicationServices.Application
Dim Proiect1 As Autodesk.Gis.Map.Project.ProjectModel
Proiect1 = Current1.ActiveProject
MsgBox(Proiect1.Projection.ToString)
The following line of code doesn't work
Proiect1.Projection = "UTM83-12"
On vb.net gives this: "Exception of type ‘Autodesk.Gis.Map.MapException was thrown."
In Autocad gives this error: "Cannot save projection code to the drawing"
The error log is:
<?xml version="1.0" ?>
- <Map3dErrorLog xmlns:xsi=[URL]... xsi:noNamespaceSchemaLocation="AcMap3dErrorLog.xsd">
- <Session user="dpopescu" start="10/22/2009 7:22:56 AM" document="Drawing1.dwg">
<Error code="1" type="2" dispensation="1" sId="2" occurrence="1">Cannot save projection code to the drawing.</Error>
</Session>
</Map3dErrorLog>
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Is this information still stored at:
C:Program FilesCommon FilesAutodesk SharedGISCoordSys?
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Now in my
ed.WriteMessage("
Base X: " + basePoint.X.ToString()); ed.WriteMessage("
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Base Y: 294.058394637539 - OK
Block X: -76.1079129044681 - BAD
Block Y: 284.038597817502 - BAD
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