Forum

Author Topic: Unsuported datum  (Read 2313 times)

Kjellis85

  • Full Member
  • ***
  • Posts: 220
  • Archaeological field supervisor
    • View Profile
    • Contact information at University of Tromsø
Unsuported datum
« on: May 29, 2022, 05:16:14 PM »
I am trying to import a shape in EPSG 25833, the same as my MS project, but I get the Unsuported datum error. I can create shapes, but if I import a shape in the same coordinate system I get the Unsuported datum error. See attatchements.

PROBERT1968

  • Sr. Member
  • ****
  • Posts: 369
  • Hello !
    • View Profile
Re: Unsuported datum
« Reply #1 on: May 29, 2022, 08:12:36 PM »
Yeah you need to go back to GIS Software whatever you use and do not use the datum.

For example, when I use my MS , I use WGS 84 with EGM 2008 height..

So for instance, I go back to ArcGIS Pro  and I draw anything I need to export to MS,  I just export just WGS84 with no datum as a shapefile...

I think Alexey might have a better answer to your question than I do .  If you go to Ortho View, It is usually shows you at the lower right corner and it tells you what it uses the Coordinate System.

Kjellis85

  • Full Member
  • ***
  • Posts: 220
  • Archaeological field supervisor
    • View Profile
    • Contact information at University of Tromsø
Re: Unsuported datum
« Reply #2 on: May 29, 2022, 08:58:57 PM »
Thanks, I'll give it a try. Although, i do think it is bad practice :-\

Paulo

  • Hero Member
  • *****
  • Posts: 1303
    • View Profile
Re: Unsuported datum
« Reply #3 on: May 29, 2022, 09:20:48 PM »
Hello Kjellis,

when you import the shape file, does it have a corresponding prj file? Maybe you can share it? That may be the issue, maybe try deleting the prj file and when importing, select the correct CRS from drop down menu...

Following is prj of shape I created in Global Mapper and that imports correctly in MS:
Code: [Select]
PROJCS["ETRS89 / UTM zone 33N",GEOGCS["GCS_ETRS_1989",DATUM["D_ETRS_1989",SPHEROID["GRS 1980",6378137,298.257222101],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",15],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1],AUTHORITY["EPSG","25833"]]
I think the key is to have the correct EPSG code as in AUTHORITY["EPSG","25833"] at end of prj file.
Give it a try,
« Last Edit: May 30, 2022, 12:09:56 AM by Paulo »
Best Regards,
Paul Pelletier,
Surveyor

PROBERT1968

  • Sr. Member
  • ****
  • Posts: 369
  • Hello !
    • View Profile
Re: Unsuported datum
« Reply #4 on: May 29, 2022, 09:22:04 PM »
No, You can use your EPSG 25833 but I can see it comes with the Datum. Maybe Try to remove the datum and see if that works..

I had to do this because it would not work on my side with the datum... so I just remove it and just use the WGS84 to see it and it is the only way I can do this..

Kjellis85

  • Full Member
  • ***
  • Posts: 220
  • Archaeological field supervisor
    • View Profile
    • Contact information at University of Tromsø
Re: Unsuported datum
« Reply #5 on: May 30, 2022, 12:05:16 PM »
I think the key is to have the correct EPSG code as in AUTHORITY["EPSG","25833"] at end of prj file.

Thanks a lot, this worked, as well as just deleting the prj and importing in as 25833.

But I think it is strange that the output from ArcGIS Pro does ot work directly, but maybe there is a setting during export that adds AUTHORITY attribute to prj?

Paulo

  • Hero Member
  • *****
  • Posts: 1303
    • View Profile
Re: Unsuported datum
« Reply #6 on: May 30, 2022, 12:14:22 PM »
Kjellis,

there should be a setting but as I do not have ArcGis Pro, I cannot say...

In Global Mapper there is a setting in Configuration - Export as seen in following:
Best Regards,
Paul Pelletier,
Surveyor

PROBERT1968

  • Sr. Member
  • ****
  • Posts: 369
  • Hello !
    • View Profile
Re: Unsuported datum
« Reply #7 on: May 30, 2022, 05:50:08 PM »
Paulo and Kjells85,

I will give a try when I get the chance tomorrow. Today is the National Holiday here in USA and I am not working today.

In fact, when I use the WGS84 along with the EGM 2008, MS will not support it. So I went back to Export again in ArcGIS Pro 2.9.2  and without the EGM 2008 and it works...

But as Paulo said take out the prj file.. I will try that..


Paulo

  • Hero Member
  • *****
  • Posts: 1303
    • View Profile
Re: Unsuported datum
« Reply #8 on: May 30, 2022, 06:12:33 PM »
Hello Probert,

good holiday!

When you export from ArcGis, check your prj file. It should have an AUTHORITY["EPSG","9518"] record in case of WGS84 + EGM2008 compound CS as in:
Code: [Select]
COMPD_CS["WGS 84 + EGM2008 height",
GEOGCS["WGS 84",
DATUM["World Geodetic System 1984 ensemble",
SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9102"]],AUTHORITY["EPSG","4326"]],
VERT_CS["EGM2008 height",
VERT_DATUM["EGM2008 geoid",2005,AUTHORITY["EPSG","1027"]],
UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3855"]],
AUTHORITY["EPSG","9518"]]

if not present then MS will not recognize the CS and better to just delete the prj and during import specify the correct CS...

Hope this is helpful
Best Regards,
Paul Pelletier,
Surveyor

PROBERT1968

  • Sr. Member
  • ****
  • Posts: 369
  • Hello !
    • View Profile
Re: Unsuported datum
« Reply #9 on: May 31, 2022, 12:46:57 AM »
Got it. I will check that tomorrow morning.. If that doesn't work I will take out the prj file and see...

I will let you know .

PROBERT1968

  • Sr. Member
  • ****
  • Posts: 369
  • Hello !
    • View Profile
Re: Unsuported datum
« Reply #10 on: May 31, 2022, 04:43:05 PM »
If you import the shapefiles from any GIS ( I am using ArcGIS Pro) and I always notice that the shapefile is below the Terrain... For some reason I don't know .

See screenshot,

But if you open Agisoft Viewer,  if you import any shapefiles from any GIS Software  it is still below the surface BUT if you re-draw over the original shapefile,  it will overlay correctly ....

I will need to do some more work around for that in the Viewer.... 

« Last Edit: May 31, 2022, 04:44:48 PM by PROBERT1968 »

Kjellis85

  • Full Member
  • ***
  • Posts: 220
  • Archaeological field supervisor
    • View Profile
    • Contact information at University of Tromsø
Re: Unsuported datum
« Reply #11 on: May 31, 2022, 04:45:37 PM »
When importing from Arcgis Pro I got nothing. Only workaround is as previously mentioned.

PROBERT1968

  • Sr. Member
  • ****
  • Posts: 369
  • Hello !
    • View Profile
Re: Unsuported datum
« Reply #12 on: May 31, 2022, 06:45:33 PM »
Hello Probert,

good holiday!

When you export from ArcGis, check your prj file. It should have an AUTHORITY["EPSG","9518"] record in case of WGS84 + EGM2008 compound CS as in:
Code: [Select]
COMPD_CS["WGS 84 + EGM2008 height",
GEOGCS["WGS 84",
DATUM["World Geodetic System 1984 ensemble",
SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9102"]],AUTHORITY["EPSG","4326"]],
VERT_CS["EGM2008 height",
VERT_DATUM["EGM2008 geoid",2005,AUTHORITY["EPSG","1027"]],
UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3855"]],
AUTHORITY["EPSG","9518"]]

if not present then MS will not recognize the CS and better to just delete the prj and during import specify the correct CS...

Hope this is helpful
?
It looks like ArcGIS does not have that on their EPSG 9518. BTW, what do you meant AUTHORITY ?

Paulo

  • Hero Member
  • *****
  • Posts: 1303
    • View Profile
Re: Unsuported datum
« Reply #13 on: June 01, 2022, 08:30:56 PM »
Hi Probert,

refer to https://vsp.pnnl.gov/help/vsample/ESRI_PRJ_File.htm for info on Authority record...
Best Regards,
Paul Pelletier,
Surveyor