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Thread: Exporting 3D Contour Lines from GIS to 3D CAD format files

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    Default Exporting 3D Contour Lines from GIS to 3D CAD format files

    I am requesting from our GIS department to have 3D contour lines exported from ArcGIS into a usable 3d Cadd file. I was hoping to use them in either Autocad or MicroStation (*.dgn, *.dwg, or *.dxf)

    Not being an ArcGIS user, is this even possible? If it is possible, does anyone have any step by step instructions on "How To".

  2. #2
    Jakub Sisak
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    Default Re: Exporting 3D Contour Lines from GIS to 3D CAD format files

    They can be exported directly to DXF or DWG from ArcGIS.

    Jakub Sisak, GISP
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    Eric Rice

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    Default Re: Exporting 3D Contour Lines from GIS to 3D CAD format files

    Go to ArcToolbox > Conversion Tools > To CAD > Export to CAD. Here is a link to the documentation for this tool.

    http://help.arcgis.com/en/arcgisdesk...001n000000.htm

    Regards,
    Eric
    Eric Rice
    Product Engineer
    Esri Software Products

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    Michael Contratto
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    Default Re: Exporting 3D Contour Lines from GIS to 3D CAD format files

    Quote Originally Posted by erictrice View Post
    Go to ArcToolbox > Conversion Tools > To CAD > Export to CAD. Here is a link to the documentation for this tool.

    http://help.arcgis.com/en/arcgisdesk...001n000000.htm

    Regards,
    Eric
    Eric,
    I do not use ArcGis but depend on getting contour lines in .dxf format for use in OCAD. OCAD is a program to make maps for oreinteering. We work with the local county GIS (PeoriaGIS) to get the contours in .dxf format. They sent us files earlier this year and they were fine. Last month they did the , I quote "The exact same thing" and the files do not work. The contours come out as polylines but they do not have field 38 which is the elevation of the contour line. We have also gotten contours in .dxf format from two local cities and both of these had the correct format.

    Here is an extract from the file that worked

    Extract from Jubilee file:
    ##########################
    AcDbPolyline
    90 <- The Number of Vertices flag
    583 <- The Number of Vertices flag

    70
    0
    43
    0.0
    38 <- The Elevation flag
    612.0 <- The Elevation Value
    10 <- The X Value Flag
    2386302.028874598 <- The X Value Flag
    20 <- The Y Value Flag
    1517499.999887429 <- The Y Value
    10
    2386301.690949522
    20
    1517501.495912425
    10
    2386299.30808254
    20
    1517504.652094021
    10
    2386296.49115454
    ###########################

    This is an extract from the file that did not work. Notice no 38 field

    Extract from the Wildlife Prairie Park File
    ###########################
    AcDbPolyline
    90
    234
    70
    1
    43
    0.0
    10
    2412105.140975837
    20
    1480678.342197761
    10
    2412106.589463755
    20
    1480678.551514924
    10
    #############################

    I spoke with the city that gave us the good data this week and tried to talk the local county guy through it and got the same 2D data with no elevation.

    I wrote him and he responded

    "Mike,

    I do not have a great deal of knowledge about CAD data, but I can tell you
    from looking at the DXF and DWG files in ArcCatalog, that a field called
    "Elevations" is populated with elevation data. There is also a field called
    "Elevation" that does not have any values. Will the "Elevations" field
    containing the elevation data work for your purposes? I double-checked my
    work in exporting the data to CAD format, and the result was the same as the
    data that we delivered to you."


    Any idea on what he is doing? We need to get a bunch more maps and the county is the only source.

    Thanks!

    Mike C.

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