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Author Topic: Ground Control and Coordinate system - crazy error.  (Read 12096 times)

olihar

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Ground Control and Coordinate system - crazy error.
« on: August 12, 2011, 12:17:38 PM »

Seems very strange to me, the only coordinate system I seem to get to work is local Coordinates and WGS 84, I started with ISN93 and converted them straight to WGS 84 so its the same location.

Local Coordinates, looks good.


WGS 84 looks good.


WGS 84 Looks correct in Google Earth.


Now however.

All the other coordinates system I tried seemed to fail like

ISN93 big fail.


ISN93 in Google Earth.


I tried various other ones, they all seemed to fail. Could there be something wrong with ISN93 for example.

Any ideas.

Alexey Pasumansky

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Re: Ground Control and Coordinate system - crazy error.
« Reply #1 on: August 12, 2011, 01:14:46 PM »
Hello olihar,

You need to input data in the coordinate system you are planning to work with.
PhotoScan supports conversion between coordinate systems in the same Datum, but conversion between different Datums is not supported by now.

Are you sure that data on "ISN93" screenshot is in real coordinates but not in local?
Best regards,
Alexey Pasumansky,
Agisoft LLC

olihar

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Re: Ground Control and Coordinate system - crazy error.
« Reply #2 on: August 12, 2011, 03:58:13 PM »
Hello olihar,

You need to input data in the coordinate system you are planning to work with.
PhotoScan supports conversion between coordinate systems in the same Datum, but conversion between different Datums is not supported by now.

Are you sure that data on "ISN93" screenshot is in real coordinates but not in local?

Yes thats what I did first inserted ISN93 data into the fields and used ISN93 and got this massive error, then I tried same data using local and it seemed fine.

Then I manually converted the ISN93 data into WSG84 as I wanted to try and see what Photoscan would do then. Then the identical location data just different Datum/format and it worked fine as you can see.

I just wonder if there is something wrong with the ISN93 in Photoscan.

Alexey Pasumansky

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Re: Ground Control and Coordinate system - crazy error.
« Reply #3 on: August 12, 2011, 04:18:20 PM »
Hello olihar,

PhotoScan deals with geographic coordinates system according to the EPSG registry. ISN93 has degree specification there - that's why you've got such errors.
Please check if you really operate ISN93 data.
Best regards,
Alexey Pasumansky,
Agisoft LLC

olihar

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Re: Ground Control and Coordinate system - crazy error.
« Reply #4 on: August 12, 2011, 04:46:01 PM »
I can see Photoscan has only EPSG::4659

I wonder if I am using EPSG::4944 or some other...

Let me look into this a little bit.

There are 12 ISN in EPSG...

Alexey Pasumansky

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Re: Ground Control and Coordinate system - crazy error.
« Reply #5 on: August 12, 2011, 05:11:16 PM »
Hello olihar,

Thanks for the information, we will add the following ISN2004 projections for the release version of 0.8.3 (in two weeks, I think) or earlier: EPSG 5322, 5324, 5325.
As for the ISN93 projections EPSG 4944, we will try to include it into nearest update and it will we very helpful if you can provide us .psz file (after aligned photos stage) with ground control in the projection you are using. If it is possible please send it to support@agisoft.ru.
Best regards,
Alexey Pasumansky,
Agisoft LLC

olihar

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Re: Ground Control and Coordinate system - crazy error.
« Reply #6 on: August 12, 2011, 05:21:18 PM »
I just found out, I am using the EPSG::3057

So:
ISN93 / Lambert 1993

That would be the most used one, 2004 is slowly coming through. Then i guess it would be EPSG::5325

olihar

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Re: Ground Control and Coordinate system - crazy error.
« Reply #7 on: August 12, 2011, 05:28:22 PM »
I got a test file with rough 3 ground control points, meant for then EPSG::3057...

Will it help to send that one, or will the EPSG::3057 be no problem to add?

Alexey Pasumansky

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Re: Ground Control and Coordinate system - crazy error.
« Reply #8 on: August 12, 2011, 05:32:57 PM »
Quote
Will it help to send that one, or will the EPSG::3057 be no problem to add?
Please send it if it is possible. Thanks in advance.
Best regards,
Alexey Pasumansky,
Agisoft LLC

olihar

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Re: Ground Control and Coordinate system - crazy error.
« Reply #9 on: August 12, 2011, 06:07:28 PM »
Sent link to the file in email, would be great to get to know when support for EPSG::3057 is there, I guess adding EPSG::5325 would also be great, as its the same just newer.

Thanks.