Bug report #9575

Georeferencer: Polynomial 2 transformation with 6 GCP is unable to process

Added by Michel Proulx about 6 years ago. Updated about 2 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:C++ plugins/Georeferencer
Affected QGIS version:2.0.1 Regression?:No
Operating System:Mac OS X Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:No Copied to github as #:18158

Description

QGIS 1.8.0 and 2.0.1 when georeferencing topo and geological map, .jpg / tiff. formats; lon, lat originale coordinates; 6 control points; all transfo excepted Polynomial 2-3; get inverse vectorial map like an overturned acetate sheet.

Reversed_image.pdf - Small part of vertorial issue (712 KB) Michel Proulx, 2014-02-16 01:01 PM

GCP_file - GCP file (399 Bytes) Michel Proulx, 2014-02-16 02:18 PM

History

#1 Updated by Giovanni Manghi about 6 years ago

  • Subject changed from Géorefenceur (georeferencing) URGENT to Georeferencer issue
  • Category changed from GDAL Tools to C++ Plugins
  • Status changed from Open to Feedback
  • Target version changed from Version 2.0.0 to Version 2.2

Hi, the description is not really clear. Can you add sample data (including the GPC file)? Maybe also a screenshot of the expected/obtained results?

#2 Updated by Michel Proulx about 6 years ago

Dear Giovanni

What's mean and where to find GPC file?

Here is attached final result.

#3 Updated by Giovanni Manghi about 6 years ago

Michel Proulx wrote:

Dear Giovanni

What's mean and where to find GPC file?

Here is attached final result.

so the wrong output (flipped) is a raster, the one modified by the georeferencer, correct?

The GCP are the ground control points, the one you define to make the georeferencing, that you can save as file one you defined them.

If you can attach here the original image and the GCP file (plus all the parameters you are using) we can try what is going wrong.

#4 Updated by Michel Proulx about 6 years ago

Oginal map makes 180 Mo. I can't send it here.

You're right what I get from georeferencer is flipped raster!? Flipped raster with flipped coordinates too.

#5 Updated by Giovanni Manghi about 6 years ago

Michel Proulx wrote:

Oginal map makes 180 Mo. I can't send it here.

You're right what I get from georeferencer is flipped raster!? Flipped raster with flipped coordinates too.

if is a tif and you zip it then it compresses a lot. You can also use something like dropbox or similar to add a link.

#6 Updated by Michel Proulx about 6 years ago

Here GCP file and orginal map.

#7 Updated by Michel Proulx about 6 years ago

  • % Done changed from 0 to 80

Problem solved. West of the Meridian line longitidude coordinates are negative.

I think it is not clearly mentionned in QGIS 2.0 maybe added directly into Georeferencer.

Other problem occurs, Polynomial 2 transformation with 6 GCP is unable to process.

Thanks

#8 Updated by Giovanni Manghi about 6 years ago

  • Assignee deleted (Giovanni Manghi)

Other problem occurs, Polynomial 2 transformation with 6 GCP is unable to process.

so this is the real issue, right?

#9 Updated by Michel Proulx about 6 years ago

Michel Proulx wrote:

Problem solved.+ West of the Meridian line longitidude coordinates are negative+.

I think it is not clearly mentionned in QGIS 2.0 maybe added it directly into Georeferencer.

Other problem occurs, Polynomial 2 transformation with 6 GCP is unable to process.

Thanks

#10 Updated by Giovanni Manghi about 6 years ago

Michel Proulx wrote:

Michel Proulx wrote:

Problem solved.+ West of the Meridian line longitidude coordinates are negative+.

I think it is not clearly mentionned in QGIS 2.0 maybe added it directly into Georeferencer.

so what was the solution?

Other problem occurs, Polynomial 2 transformation with 6 GCP is unable to process.

what is the error?

#11 Updated by Michel Proulx about 6 years ago

Solution: put - for longitude like -77° 45' 00"

Error: Failed calculation processing of the control points. Processing can not be resolved. 6 GCP (-lon, lat), Polynimial 2 with nearest neighbor no compression

Info:
Version de QGIS 2.0.1-Dufour Révision du code f738351
Compilé avec Qt 4.8.5 Utilisant Qt 4.8.5
Compilé avec GDAL/OGR 1.10.1 Utilisé avec GDAL/OGR 1.10.1
Compiled against GEOS 3.4.2-CAPI-1.8.2 Running against GEOS 3.4.2-CAPI-1.8.2 r3921
Version du client PostgreSQL 9.2.4 Version de SpatiaLite 4.1.1
Version de QWT 6.0.2 Version de PROJ.4 : 480
Version de QScintilla2 2.7.2

#12 Updated by Giovanni Manghi about 6 years ago

  • Subject changed from Georeferencer issue to Georeferencer: Polynomial 2 transformation with 6 GCP is unable to process
  • Status changed from Feedback to Open
  • % Done changed from 80 to 0

#13 Updated by Jürgen Fischer almost 6 years ago

  • Target version changed from Version 2.2 to Future Release - Lower Priority

#14 Updated by Jürgen Fischer almost 6 years ago

  • Category changed from C++ Plugins to C++ plugins/Georeferencer

#15 Updated by Giovanni Manghi almost 3 years ago

  • Easy fix? set to No
  • Regression? set to No

#16 Updated by Giovanni Manghi about 2 years ago

  • Status changed from Open to Feedback

Please test with a recent QGIS release (2.18 or 3), if the issue/request is still valid change the affected version accordingly, if is fixed/implemented then close the ticket. Thanks!

#17 Updated by Giovanni Manghi about 2 years ago

  • Status changed from Feedback to Closed
  • Resolution set to invalid

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