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Author Topic: Vertical Datum out of range 1.7.1  (Read 3968 times)

flyzk

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Re: Vertical Datum out of range 1.7.1
« Reply #15 on: January 30, 2021, 11:34:12 PM »
Maybe the problem come from another source: I've changed both my Marker and project that was in the old custom GEOID by the new one. Maybe I should only change the project coordinate system without changing the marker and then create DEM?

Paulo

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Re: Vertical Datum out of range 1.7.1
« Reply #16 on: January 31, 2021, 12:11:38 AM »
The difference in geoid height at these 4 points is maximum 4 mm. So 10 cm error does not come from this expanded geoid

Code: [Select]
ID X Y Z RAR07 fr ign RAR07 Geoid_Diff
1 321294.397 7681606.334 11.304 3.501 3.502 -0.001
2 321372.135 7683392.457 8.955 3.246 3.250 -0.004
3 321179.878 7682426.914 2.417 3.369 3.373 -0.004
4 321360.926 7683811.359 3.321 3.181 3.184 -0.003
« Last Edit: January 31, 2021, 12:15:49 AM by Paulo »
Best Regards,

Paul Pelletier

Alexandre Demers-Potvin

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Re: Vertical Datum out of range 1.7.1
« Reply #17 on: March 18, 2021, 03:14:19 AM »
Hi, everyone,

I've encountered similar challenges when I tried to export a 3D model from Metashape 1.7 in .kmz format. No matter which geographical and vertical CS I used, the vertical datum was always out of range. I made sure I always used the same CS for markers and cameras at every attempt, but it just didn't work. I followed Alexei's advice and got the following results.

1. Disable interpolation for mesh building: didn't work
2. Expand geoid: didn't work. I noticed that it is possible to edit the No Data area in the 'import geoid' pane, but this edit doesn't appear to get saved, no matter which geoid I import. I tried to edit that in the 'ToWGS84' pane too, but it didn't work either. I tried the EGM 96, NAVD88 and CGVD2013 to no avail.

Disclaimer: the only reference data for my model consists in a single georeferenced camera plus 2 control points I placed manually by estimating their position from Google Earth. Maybe my reference data just isn't precise or accurate enough for now.

Here are the coordinates of my reference data just in case:

Type               Longitude            Latitude           Altitude(m)         Altitude error(m)
Camera          -111.394094         50.759816        695.059504          1.399042
Marker           -111.394115         50.760669         668.559534          0.000001
Marker           -111.393617         50.760367         670.559513          -0.000001

Thanks,
Alexandre Demers-Potvin


Alexey Pasumansky

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Re: Vertical Datum out of range 1.7.1
« Reply #18 on: March 21, 2021, 07:50:24 PM »
Hello Alexandre,

Do you observe the problem in 1.7.2 version as well?
Best regards,
Alexey Pasumansky,
Agisoft LLC

wizprod

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Re: Vertical Datum out of range 1.7.1
« Reply #19 on: April 03, 2021, 01:26:36 AM »
I am also having this problem a lot! Usually happens at some point after converting Cameras to another datum. And especially prone to happen if Markers and Cameras are not converted at the same time, or you use the Update from Exif, resulting in a Datum mismatch between Markers and Cameras.

And the real mess is that there seem to be no remedy other than do the project again from scratch :(

Also occuring in 1.7.2.
« Last Edit: April 03, 2021, 01:36:17 AM by wizprod »