Bug report #20617: refreshing of a layer (raster) doesn't work after georeferencing - QGIS Application - QGIS Issue Tracking

Bug report #20617

refreshing of a layer (raster) doesn't work after georeferencing

Added by Gabriela Osaci Costache almost 6 years ago. Updated almost 6 years ago.

Status:	Open
Priority:	High
Assignee:	-
Category:	C++ plugins/Georeferencer
Affected QGIS version:	3.4.1	Regression?:	Yes
Operating System:		Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:
Crashes QGIS or corrupts data:	No	Copied to github as #:	28437

Description

Steps:

1. load an already geo-referenced map
2. open the georeferencer and load the map to be georeferenced and choose/set some GCP points
3. save the file with the points
4. choose the transformation settings and select "Load in QGIS when done".
5. press "Start georeferencing", result map is loaded. Keep the georeferencer dialog open

Up to this point everything goes smoothly, as always, up to version 2.18.25 included

7. add some new GCPs or modify existing ones
8. set the transformation settings with the option "Load in QGIS when done" NOT active, set the output name the same as the previous georeferencing operation, effectively overwriting the previous output
9. press "Start georeferencing".

At this point in QGIS 2.18 using "Refresh (F5)" will effectively show the result of the second georeferencing operation while in QGIS 3 it continues to show the first result.

File (zip): https://drive.google.com/file/d/1c4q_jP9rKS0IQ_2olAI6qPb4QJFfSnHz/view?usp=sharing

cattura_QGIS_341_bis.png (2.67 MB) Gabriela Osaci Costache, 2018-11-26 05:58 PM

History

#1 Updated by Giovanni Manghi almost 6 years ago

Status changed from Open to Feedback
Priority changed from Normal to High

I'm quite familiar with the georeferencing process, but somehow I'm struggling to understand the problem (in your sample data, what is the map that is already georeferenced and the one you want to georeference?) . A screencast would be much appreciated.

#2 Updated by Gabriela Osaci Costache almost 6 years ago

- the file "Lambert_1904_Campulung_frammento" = the georeferencing map
- the "Lambert_1904_Campulung_frammento_modificato" file = the georeferenced map using the Helmert transformation
- the file "Lambert_1904_Campulung_frammento_modificato_TPS" = the georeferenced map using the TPS transformation

Grazie!

#3 Updated by Giovanni Manghi almost 6 years ago

Gabriela Osaci Costache wrote:

- the file "Lambert_1904_Campulung_frammento" = the georeferencing map

this map is no georeferenced, so you cannot use it to georeference other maps:

giovanni@sibirica:~$ gdalinfo Downloads/georef/Lambert_1904_Campulung_frammento.tif
Driver: GTiff/GeoTIFF
Files: Downloads/georef/Lambert_1904_Campulung_frammento.tif
Size is 2414, 1541
Coordinate System is `'
Metadata:
TIFFTAG_DOCUMENTNAME=C:\Users\Catalina\Desktop\Lambert_Campulung_frammento.tif
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
TIFFTAG_XRESOLUTION=200
TIFFTAG_YRESOLUTION=200
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 1541.0)
Upper Right ( 2414.0, 0.0)
Lower Right ( 2414.0, 1541.0)
Center ( 1207.0, 770.5)
Band 1 Block=2414x64 Type=Byte, ColorInterp=Red
Band 2 Block=2414x64 Type=Byte, ColorInterp=Green
Band 3 Block=2414x64 Type=Byte, ColorInterp=Blue