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Thread: Survey Trimble Points at Lat/Long and Autocad Basemap are at different coordinates

  1. #1
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    Default Survey Trimble Points at Lat/Long and Autocad Basemap are at different coordinates

    I believe I have found the answer here on AUGI Forums under:
    Lat/Long & NAD83 Conversion.

    Seems to be just a conversion process.

    I am trying to import my Surveyor's Trimble points which were sent to me in Lats/Long into my Basemap which has coordinates from an unknown source, The basemap is a converted dgn to dwg file, - (I have tried using convert with subbase as well). The Basemap is to scale as it is a Road in New Jersey and everything lines up with the Aerial Maps. But the coordinates are not Lat/Long in the Basemap. I have tried scaling using the points but it does not scale uniformly. - When I import his points they measure: 34.0881 apart, while my Basemap corresponding point locations measure: 32,976.1427 (which is the correct distance in the real world) . So my Basemap is scaled up by 967.38 from the lat/longs. But if I use this as a scale factor, the Lat/Long points do not fall into place. or If I scale by reference they still do not line up correctly. (I am not sure what my reference point would be, 0,0,0?)
    I am hoping someone has some experience with this as my Surveyor is sending me points from GPS Trimble using these Lats/Longs coordinates and they must fall into my Basemap correctly..

    The Lat/Long point coordinates are:

    Pnt No.1
    x= -74.1384
    y= 40.1017

    Pnt. No. 2
    y= 40.1865

    whilst my Basemap corresponding locations are:

    Pnt No.1
    x= 593253.839
    y= 462165.7184

    Pnt. No. 2
    x= 603593.9213
    y= 493478.7937

    btw, He sends me .dxf files.

    Is there some way to convert these Lat/Long points to my coordinates?

    He also sent me a .csv file from another project close by in csv format which I am attaching. I am not sure if this is relevant but it shows his coordinates and ALOT of other information. I had to rename it to .xls for uploading - but the csv looks the same.
    Attached Files Attached Files
    Last edited by David Davis; 2013-07-03 at 09:08 PM. Reason: Found Answer

  2. #2
    Geospatial Moderator Jmurphy's Avatar
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    Default Re: Survey Trimble Points at Lat/Long and Autocad Basemap are at different coordinates

    Take a look at Corpscon.

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