Make custom Shift Grid

Hello,

I ´ve got one question.

I would like to make my own shift grid for national conversion between new an old datum (and reverse). I ´ve got an xls file with X, Y coordinates and their dX and dY. Is there any chance to make own shift grid in Bentley map or I will need other software.

I have read something about GSB files in GeoCoordinateData (http://communities.bentley.com/products/geospatial/desktop/f/5924/p/53164/123488#123488) but I don't  know if those files uses same values (X,Y,dX,dY) or they are completely different.

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  • Rybovic,

    Bentley System does not provide any software to generate grid shift files however we do provide ways to use a datum given you have a grid shift file in the Canadian National Transformation v2 (GSB) format. I know that this format relies on variable precision cells to apply latitude and longitude deltas so it is more complex than a simple table. You may want to search over the web about the details concerning this format or contact someone at the NRC/RNC (National Resources Canada/Ressources Naturelles Canada) to obtain details about the file format (We use a third party software to read these files so we do not know the details).
    Given you succeed in generating a GSB file then to use it you must make use of the datum named GENGRID (available on latest versions of Microstation SS3 and more recent only) and follow the instructions contained in the GenGridToWgs84.gdc file located in the GeoCoordinateData directory in the Microstation path to set it up.

    Hope this helps

Reply
  • Rybovic,

    Bentley System does not provide any software to generate grid shift files however we do provide ways to use a datum given you have a grid shift file in the Canadian National Transformation v2 (GSB) format. I know that this format relies on variable precision cells to apply latitude and longitude deltas so it is more complex than a simple table. You may want to search over the web about the details concerning this format or contact someone at the NRC/RNC (National Resources Canada/Ressources Naturelles Canada) to obtain details about the file format (We use a third party software to read these files so we do not know the details).
    Given you succeed in generating a GSB file then to use it you must make use of the datum named GENGRID (available on latest versions of Microstation SS3 and more recent only) and follow the instructions contained in the GenGridToWgs84.gdc file located in the GeoCoordinateData directory in the Microstation path to set it up.

    Hope this helps

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