Exporting DGN to Google Earth doesn't come up in the right place (SS3)

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Azamat Kasymov — Wed, 20 Jun 2018 20:51:37 GMT

Yes, that's how I did it. By selecting everything (CTR+A) and scaling down/up with the provided scale. For example if the surveyors provided a scale factor adjustment of 1.000190 for a certain county then all you have to do is select all and change the scale.

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

David Trejo-Rodriguez — Wed, 20 Jun 2018 17:58:11 GMT

Thank you for sharing that information is the workflow outlined in the following post similar to what you used?

https://communities.bentley.com/products/microstation/f/microstation-forum/93805/how-to-apply-a-surface-to-grid-scale-factor-adjustment

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Azamat Kasymov — Wed, 20 Jun 2018 15:06:09 GMT

The solution to my question:

Some states, counties provide a scale factor for the survey file. You have to apply the scale factor then export the dgn in order for it to come at the right place.

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Lorys — Fri, 16 Sep 2016 11:25:05 GMT

most countries have a online national survey dept with Permanent survey markers and their coordinates as well as cadaster files

if you know here your site is you can find this data on line download the cadaster file in dgn set its CGS just in case

then plot the survey marks onto it with say put circles and keyin xy= easting coord, northing coord

the coord you get from the web site...

then ref attach your original data to the down loaded file and see if any object line up... if not go back to your original file and plot the survey marks again manually in this file then try google map to place the survey marks from both files if they dont land exactly the same then you first file is at fault and is not in the right place

to try to fx this ref attach the modified cadaster file with the survey marks ( labelled by hand too) into your original file now try to move rotate scale whatever the active data original file data to match the ref file survey marks... now save and tell it to use the gcs of choice but dont choose to correct the data ..

your files should now match and so they should in google earth...

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Rod Wing — Wed, 14 Sep 2016 18:21:42 GMT

[quote user="Frank Klein"]

Azamat Kasymov

I don't know how the original dgn was created, but it didn't have any GCS assigned

If you do not know this, you can not assume in a geographical precision that your own data is correct or precise enough to align with
the google data. And we do not know anything about the precision of the google data in your area, either.

[/quote]

Not knowing how the original data was created how do you know you are using the correct GCS?
It could be based on a different datum. I would try assigning different coordinate systems in that area then get geographic coordinate readouts of different benchmark locations to verify the accuracy. If you don't know how to get geographic readouts refer to the link below.

envisioncad.com/.../longitude-latitude-coordinate-readout

Have you verified that the data is really in US Survey feet and not in International feet?
That difference usually yields a 3-5 foot offset in most areas, but 20-30 feet may not be out of the question for other areas.

If you're still having problems after all that then you may be stuck with placing benchmark points. If you have multiple drawings from the same source you can define a custom coordinate system from the benchmarks in one file, then copy that GCS to the others.

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Frank Klein — Wed, 14 Sep 2016 16:24:44 GMT

[quote user="Azamat Kasymov"]I don't know how the original dgn was created, but it didn't have any GCS assigned[/quote]

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Azamat Kasymov — Wed, 14 Sep 2016 15:51:16 GMT

Hi Frank. I used "TX83/2011-SCF" GCS. I don't know how the original dgn was created, but it didn't have any GCS assigned.

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Azamat Kasymov — Wed, 14 Sep 2016 15:49:17 GMT

Thanks for your response. I've activated the right GCS but still getting the same issue.

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Frank Klein — Wed, 14 Sep 2016 15:40:16 GMT

Hi azamat,
How was your data within the DGN file created?
What Gcs was used.
Are you aware in detail of the accuracy and precision of your own data?

RE: Exporting DGN to Google Earth doesn't come up in the right place (SS3)

Reginald Wallace — Wed, 14 Sep 2016 15:39:36 GMT

See if the following suggestions might be helpful:

communities.bentley.com/.../15792.export-to-google-earth-wrong-location

If are using geographic coordinate system instead of placemarks you need to make sure it is active in the auxiliary coordinate dialog.

As you can see from above that just because the GCS is attached does not mean the coordinates are active.

To activate simply double click on the GCS in the dialog.