On 22 Feb 2016 4:54 AM, "Bo Victor Thomsen" <[email protected]> wrote: > > Hi David - > > Now with QGIS upgraded to use GDAL 2.0.2 it has the necessary building blocks to read "the slightly dodgy" tif-with-tab files** (My own words IIRC ? ). The only thing I can't figure out it how to activate the "TAB_APPROX_GEOTRANSFORM" qualifier. > > Maybe some of the experienced users/developers could tell us how ? > > If it not already possible to activate this fuction, I see some possibilities for this to happen: > It could permanently be activated in QGIS. (It would only affect the users with tiff - files witout geo information embedded in the tiff; with corresponding tab files and where the tab files contains "slightly dodgy" information. That must be a smallish amount of users. > It could be activated by a new user setting for QGIS.
Is there an open bug report about this? (Preferably with test data available) Nyall > > > Regards > Bo Victor Thomsen > > ** The phrase "slightly dodgy tif-with-tab" files implies, that: > the tiff file does not contain any geoinformation. > It has a corresponding tab file, which contains the geoinformation. > And lastly: This information contains som smallish error when calculating the affine transformation from pixels to world coordinates, probably because the 4 (or more) pixel point/world coordinate pairs has been generated by hand. > In this case GDAL will make a least squares adjustment from the possible solutions - if the "TAB_APPROX_GEOTRANSFORM" is activated. Otherwise it simply produces an error. > > > Den 21/02/16 kl. 12:35 skrev David Addy: >> >> This is good news indeed for all UK local authorities who use MapInfo. Will >> we now be able to use the extra commands of “TAB_APPROX_GEOTRANSFORM YES” >> for all those slightly dodgy tab with tiff files created over the years? >> Although we can use QGIS to convert these into Geotiffs, it is much more >> user friendly to be able to read existing MapInfo tiffs with tabs without >> such a need for a conversion. >> Bo Victor put in an enhancement request for this feature a year ago. >> >> >> >> -- >> View this message in context: http://osgeo-org.1560.x6.nabble.com/GDAL-OGR-2-0-in-OSGeo4W-tp5251832p5251887.html >> Sent from the Quantum GIS - User mailing list archive at Nabble.com. >> _______________________________________________ >> Qgis-user mailing list >> [email protected] >> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
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