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QGIS is a free, open source, cross platform (lin/win/mac) geographical information system (GIS)
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Allow custom proj operation definitions when transforming between two CRSes #31106

Open MichelRuijter opened 5 years ago

MichelRuijter commented 5 years ago

I am trying to define a custom CRS. I have tested this CRS in OSGEO and I am able to put this CRS in the adapted CRS screen. It works for the test coordinates. When I press "OK" Qgis replies that the CRS is not valid: See also attached screenshot crsshot2

cct +proj=pipeline +step +proj=cart +ellps=WGS84 +step +proj=helmert +convention=coordinate_frame +x=194.245 +y=-154.53 +z=102.676 +rx=351.5046 +ry=-701.841 +rz=251.9889 +s=6.296557 +exact +step +proj=cart +inv +ellps=intl +step +proj=tmerc +units=m +lat_0=17.63621319 +lon_0=-63.23752013 +x_0=4714.87 +y_0=1967.19 +k_0=1.0

Describe the bug

How to Reproduce

QGIS and OS versions

Additional context

nyalldawson commented 5 years ago

Can you confirm your PROJ library version number?

MichelRuijter commented 5 years ago

Nyall,

I use QGIS 3.6.1 and as far as I can see QGIS uses a similar (identical) share\proj files as OSGEO.

Kind regards,

Michel

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Op di 6 aug. 2019 om 08:34 schreef Nyall Dawson notifications@github.com:

Can you confirm your PROJ library version number?

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nyalldawson commented 5 years ago

You'll need 3.8.1 and a build based off Proj 6.1 in order to use pipeline based CRSes.

MichelRuijter commented 5 years ago

Nyall,

Thanks I am going to try that.

Michel

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Op di 6 aug. 2019 om 08:50 schreef Nyall Dawson notifications@github.com:

You'll need 3.8.1 and a build based off Proj 6.1 in order to use pipeline based CRSes.

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MichelRuijter commented 5 years ago

Nyall,

I just installed "zanzibar" 64 bit version but I still got the proj 4 message.

How do I activate proj6?

Kind regards,

Michel [image: image.png]

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Op di 6 aug. 2019 om 08:50 schreef Nyall Dawson notifications@github.com:

You'll need 3.8.1 and a build based off Proj 6.1 in order to use pipeline based CRSes.

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nyalldawson commented 5 years ago

The windows builds aren't currently using it -- you need to do a custom build for now.

MichelRuijter commented 5 years ago

Nyall,

Does that mean that I should start with the OSgeo4W installation? is there a procedure which I should follow?

Kind regards,

Michel

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Op di 6 aug. 2019 om 09:31 schreef Nyall Dawson notifications@github.com:

The windows builds aren't currently using it -- you need to do a custom build for now.

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nyalldawson commented 5 years ago

Windows builds are very tricky, and it's going to be made much trickier because you'd also need to build proj 6. I'd suggest waiting till the official builds upgrade, at which stage this will be supported. In the meantime, it's more or less impossible on Windows.

jef-n commented 5 years ago

Hi Nyall,

On Tue, 06. Aug 2019 at 00:56:00 -0700, Nyall Dawson wrote:

Windows builds are very tricky, and it's going to be made much trickier because you'd also need to build proj 6.

There are nightly builds of PROJ in OSGeo4W that can be used to do this (also nightlies of GDAL that depend on the PROJ nightly).

But as GRASS doesn't support PROJ 6 yet, so the upgrade didn't take place yet.

Jürgen

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nyalldawson commented 5 years ago

@jef-n

But as GRASS doesn't support PROJ 6 yet, so the upgrade didn't take place yet.

I saw this in another thread, but didn't understand it. PROJ 6 doesn't drop the deprecated proj 4 API, so it should be able to build just by defining the ACCEPT_USE_OF_DEPRECATED_PROJ_API_H macro

MichelRuijter commented 5 years ago

Jurgen,

Can you explain to me how I should proceed? Just wait or is there an option to include the proj 6.. options in QGIS?

Kind regards,

Michel

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Op di 6 aug. 2019 om 11:03 schreef Jürgen Fischer <notifications@github.com

:

Hi Nyall,

On Tue, 06. Aug 2019 at 00:56:00 -0700, Nyall Dawson wrote:

Windows builds are very tricky, and it's going to be made much trickier because you'd also need to build proj 6.

There are nightly builds of PROJ in OSGeo4W that can be used to do this (also nightlies of GDAL that depend on the PROJ nightly).

But as GRASS doesn't support PROJ 6 yet, so the upgrade didn't take place yet.

Jürgen

-- Jürgen E. Fischer norBIT GmbH Tel. +49-4931-918175-31 Dipl.-Inf. (FH) Rheinstraße 13 Fax. +49-4931-918175-50 Software Engineer D-26506 Norden https://www.norbit.de QGIS release manager (PSC) Germany IRC: jef on FreeNode

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MichelRuijter commented 4 years ago

Nyall,

A couple of month's ago you explained that the proj6 definition would become available within QGIS. I have downloaded since then every new version of QGIS but I still get a CRS error indicating that my CRS is not confirming the proj4 definition.

Do I forget something or is proj 6 still not available within the new QGIS?

Kind regards,

Michel Ruijter

Op di 6 aug. 2019 om 09:56 schreef Nyall Dawson notifications@github.com:

Windows builds are very tricky, and it's going to be made much trickier because you'd also need to build proj 6. I'd suggest waiting till the official builds upgrade, at which stage this will be supported. In the meantime, it's more or less impossible on Windows.

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nyalldawson commented 4 years ago

@MichelRuijter is your build based on proj 6? You can check via the About dialog

MichelRuijter commented 4 years ago

Nyall,

I use the win 10 version of QGis 3.10, Coruna and it uses the Proj version 5.2.0.

Is there a way (for me) to compile Qgis with the proj6 version?

Kind regards,

Michel

Op di 19 nov. 2019 om 08:18 schreef Nyall Dawson notifications@github.com:

@MichelRuijter https://github.com/MichelRuijter is your build based on proj 6? You can check via the About dialog

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roya0045 commented 4 years ago

@MichelRuijter Update QGIS, it should come with proj6.

MichelRuijter commented 4 years ago

Alex,

Thanks very much the latest version is compiled against proj 6..2.1

I tried within OSGEO 4 the following string:

echo -63.25156367 17.61578594 -41.194 |cct +proj=pipeline +step +proj=cart +ellps=WGS84 +step +proj=helmert +convention=coordinate_frame +x=194.245 +y=-154.53 +z=102.676 +rx=351.5046 +ry=-701.841 +rz=251.9889 +s=6.296557 +exact +step +proj=cart +inv +ellps=intl +step +proj=tmerc +units=m +lat_0=17.63621319 +lon_0=-63.23752013 +x_0=4714.87 +y_0=1967.19 +k_0=1.0

and I got the proper answer: 3215.43 (E) and -287.55 (N)

If I include the following string in the CRS in the new Qgis

+proj=pipeline +step +proj=cart +ellps=WGS84 +step +proj=helmert +convention=coordinate_frame +x=194.245 +y=-154.53 +z=102.676 +rx=351.5046 +ry=-701.841 +rz=251.9889 +s=6.296557 +exact +units=m +no_defs +step +proj=cart +inv +ellps=intl +step +proj=tmerc +units=m +lat_0=17.63621319 +lon_0=-63.23752013 +x_0=4714.87 +y_0=1967.19 +k_0=1.0

and try to use "lon -63.25156367 lat 17.61578594) I got the message that the proj string is invalid and the message that the sting is not proj4

In the older versions of QGIS The same string gave proper values in the test environment and only when you click on "OK" the above message.

Do you have an idea how to proceed?

Kind regards,

Michel

Op di 19 nov. 2019 om 17:44 schreef Alex notifications@github.com:

@MichelRuijter https://github.com/MichelRuijter Update QGIS, it should come with proj6.

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rouault commented 4 years ago

I tried within OSGEO 4 the following string:

This is a PROJ coordinate operation / pipeline string, not a PROJ CRS string, which is what QGIS / GDAL expects. In your use case, you could try +proj=tmerc +units=m +lat_0=17.63621319 +lon_0=-63.23752013 +x_0=4714.87 +y_0=1967.19 +k_0=1.0 +ellps=intl +towgs84=194.245,-154.53,102.676 ,-351.5046,701.841,-251.9889,6.296557 (note the negated signs of the rotation terms to pass from coordinate_frame convention to the implied position_vector by +towgs84)

MichelRuijter commented 4 years ago

Even,

Thanks, I will try this (again) but, as far as I know the "towgs" statement uses approximations for the rotation part of the transformation, in the case provided the rotations are large and towgs does not work.

Nyall has worked on the integration of Proj6 within Qgis and Proj6 should have the option to include more complex coordinate transformations including large rotations.

Kind regards,

Michel

Thanks

Op di 19 nov. 2019 19:55 schreef Even Rouault notifications@github.com:

I tried within OSGEO 4 the following string:

This is a PROJ coordinate operation / pipeline string, not a PROJ CRS string, which is what QGIS / GDAL expects. In your use case, you could try +proj=tmerc +units=m +lat_0=17.63621319 +lon_0=-63.23752013 +x_0=4714.87 +y_0=1967.19 +k_0=1.0 +ellps=intl +towgs84=194.245,-154.53,102.676 ,-351.5046,701.841,-251.9889,6.296557 (note the negated signs of the rotation terms to pass from coordinate_frame convention to the implied position_vector by +towgs84)

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rouault commented 4 years ago

Proj6 should have the option to include more complex coordinate transformations including large rotations.

It does. But not in the CRS definition. Actually any Helmert-based transformation has nothing to do with the CRS definition, but is related how to the CRS transforms to another one. I'm not sure if QGIS has currently an option to define a custom PROJ pipeline between 2 CRS but I'm not sure. There is a Datum preference tab in Projects/Settings or Preferences/Options where you can select a datum transformation, but I couldn't find a way to override to add a PROJ pipeline. Another possibility might be to tune the proj.db to define your own transformation, but that's a bit more involved.

MichelRuijter commented 4 years ago

Even,

What still confuses me is that the pipeline structure as send in a previous mail works within QGIS in the "CRS test window" and I get the proper coordinates, but once I press OK that QGIS replies that the pipeline structure (the CRS) is not a valid proj 4 string.

In the new QGIS that uses proj6 I was not even able to get the proper coordinates in the CRS Test window.

Michel

Op wo 20 nov. 2019 om 11:01 schreef Even Rouault notifications@github.com:

Proj6 should have the option to include more complex coordinate transformations including large rotations.

It does. But not in the CRS definition. Actually any Helmert-based transformation has nothing to do with the CRS definition, but is related how to the CRS transforms to another one. I'm not sure if QGIS has currently an option to define a custom PROJ pipeline between 2 CRS but I'm not sure. There is a Datum preference tab in Projects/Settings or Preferences/Options where you can select a datum transformation, but I couldn't find a way to override to add a PROJ pipeline. Another possibility might be to tune the proj.db to define your own transformation, but that's a bit more involved.

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MichelRuijter commented 4 years ago

Even,

The CRS definition, seems not to accept proj6 strings, however in the choice of reference systems the "pipeline" option is widely used, so how can I edit the underlying proj database to include a custom made projection/transformation

Kind regards,

Michel

Op wo 20 nov. 2019 om 11:01 schreef Even Rouault notifications@github.com:

Proj6 should have the option to include more complex coordinate transformations including large rotations.

It does. But not in the CRS definition. Actually any Helmert-based transformation has nothing to do with the CRS definition, but is related how to the CRS transforms to another one. I'm not sure if QGIS has currently an option to define a custom PROJ pipeline between 2 CRS but I'm not sure. There is a Datum preference tab in Projects/Settings or Preferences/Options where you can select a datum transformation, but I couldn't find a way to override to add a PROJ pipeline. Another possibility might be to tune the proj.db to define your own transformation, but that's a bit more involved.

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nyalldawson commented 4 years ago

@MichelRuijter

Sorry, I missed that your definition was actually defining an operation and not a CRS in my earlier response.

This isn't yet possible to do via the QGIS ui (but the required backend capabilities should all be present). What we'd need to do is extent the transformation selection dialog (the dialog which allows you to pick from known transformation pathways between a source and destination crs pair) to also allow users to enter a custom proj operation string, alongside the existing choice of known operations.

This would then allow QGIS to use your custom operation when transforming between the source/destination CRSes.

There's a bit of development work required to do this, mainly just revamping the transformation selection dialog to allow this kind of manual entry. Let me know if you'd like to sponsor this change!

Ognian commented 6 months ago

Having exact the same problem, I'm wondering if there is another way to do it, since it is quite a bit of time passed since this was opened...

otofoto commented 4 months ago

@Ognian If you would like to test new pipeline, you must edit proj.db, add the new transform and a new usage record for it. Only after that you select my custom transform there. However, this approach is a bit too complicated, as described above.