[Qgis-user] GDAL/OGR 2.0 in OSGeo4W

[Nyall Dawson]

On 22 Feb 2016 4:54 AM, "Bo Victor Thomsen" <bo.victor.thomsen at gmail.com>
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.
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