Using MicroStation v8i SS4 08.11.09.829.
I have a DGN file with a GCS in it. I am using a Helmert transformation to define a rotation of -4.7641666 degrees and a scale of 1:500000. The Helmert transformation parameters therefore become:
Helmert A: scale times cos (rotation) = 500000 * cos (-4.7641666) = 498272,4987
Helmert B: scale times sin (rotation) = 500000 * sin (-4.7641666) = -41527,3048
When I attach a Bing Maps layer, the scale looks about correct but the scale doesn't. The rotation is Bing Maps is about 206 degrees (rough estimate).
When using auxiliary coordinates or exporting a KMZ to Google Maps the result is correct.
If I set the rotation to 0 degrees (and therefore Helmert A to 500000 and Helmert B to 0), the Bing Maps raster is correct.
I have a sample DGN if necessary.
if you have a license for bing maps dont you just attach it as raster through the raster menu option? Then it should just reproject itself right?
The following link explains everything about using bing maps
communities.bentley.com/.../working-with-bing-maps
Lorys
Started msnt work 1990 - Retired Nov 2022 ( oh boy am I old )
But was long time user V8iss10 (8.11.09.919) dabbler CE update 16 (10.16.00.80)
MicroStation user since 1990 Melbourne Australia.click link to PM me
That's right and that works but apparently it doesn't work well for Helmert transformation if it includes rotation (i.e. Helmert B not set to 0).
MarkSmit said:That's right and that works but apparently it doesn't work well for Helmert transformation if it includes rotation (i.e. Helmert B not set to 0)
I dont understand why you need the transformation at all, if you have a GCS set in your active file, and you follow the instructions for raster attach a Bing map I sent link before ie instructions from Bentley in last post, then the raster will reproject and rotate and transform itself to match the active file gcs and units etc , thats why we use a GCS to allow msnt to do the reprojection / transformations for us..