[Qgis-user] GDAL/OGR 2.0 in OSGeo4W

[Bo Victor Thomsen]

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.


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.
>
>
>
> --
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