Custom Geoid

[tazzo]

I have created a custom metashape geoid for Italy (ITG2009) from a file that can be found here https://www.isgeoid.polimi.it/Geoid/Europe/Italy/public/ITG2009_20170606.isg

After that, Metashape created a TIFF file in the geoids folder that seems completely white (attached), but If I open the .isg file in QGIS, it look fine (see attached screenshoot).

Am I missing something? Is Metashape compatible with .isg files?

I'm really trying to use this local geoid because from my understanding EGM2008 is 1' while this is 0.025 degree so much more accurate

[Paulo]

ciao tazzo,

i was able to configure the ITG2009 geoid in MS 1.8. As seen in screen shot, the geoid ITG2009.tif when loaded in Global Mapper is a 32 bit float elevation grid file. However there is a bug in version 2,2,1 when loading the resultant CS ETRS89 + ITG2009 height.


I will report to support on this issue...

[tazzo]

Hi,

Thanks a lot for your reply,

I tried both v2.0.3 and v2.2.0, but the result is the same.

The generated TIFF file is very strange, when opened with Affinity Photo looks like something is scrambled (see attached)

Thanks

[Paulo]

Tazzo,

é normale, this is a 32 bit floating 1 band image and not a 3 band RGB (24 bit). To see it correctly as an elevation grid you must open in a GIS package like Global mapper, QGIS, etc, See https://agisoft.freshdesk.com/support/solutions/articles/31000135266-exported-dem-in-tif-format-appears-to-be-black-white-when-opened-in-external-software

[tazzo]

I was sure Affinity Photo was able to open 32 bit files, but this it's only for RGB. GIMP (with a Contrast filter) is able to open the image format and look okay (also QGis of course open it correctly)
So would be better to stay with 1.8 until the bug is fixed or is already there a workaround for v2.x?

[Paulo]

I have created a custom metashape geoid for Italy (ITG2009) from a file that can be found here https://www.isgeoid.polimi.it/Geoid/Europe/Italy/public/ITG2009_20170606.isg

After that, Metashape created a TIFF file in the geoids folder that seems completely white (attached), but If I open the .isg file in QGIS, it look fine (see attached screenshoot).

Am I missing something? Is Metashape compatible with .isg files?

I'm really trying to use this local geoid because from my understanding EGM2008 is 1' while this is 0.025 degree so much more accurate

Hi Tazzo,

please download latest release of v.2.2.1 and it should solve the issue with IITG 2009