[Qgis-user] Mosaicking aerial images

[Andreas Neumann]

Hi,

The correlator project sort of does what I need, however, probably 
without blending/fusing. On the other hand my images are already very 
well georeferenced (with thin-plate spline and around 1000 points per 
image) - so not really a need to correlate.

So I am actually more looking for a blending/fusing app that keeps 
georeferencing.

I will probably ask at the gdal list as well to see if someone has an 
idea.

For my panoramic photography I use either hugin or autopano giga. Both 
do an excellent job with blending, but I fear they would delete my 
georeferencing data and I don't know if they can handle the big files I 
have.

Andreas

Am 2014-12-10 19:21, schrieb Michael Treglia:
> Hi Andreas,
> 
> I'm Bringing this back to the list, as others here probably have some
> better thoughts than I do.  Googling around, I found this tool which
> might be useful (?), though I can't tell how it handles overlaps
> [haven't even downloaded it...]:
> https://trac.osgeo.org/gdal/wiki/Correlator [4]
> 
> Not sure about enblend (can't access the site right now)
> 
> Depending on how different the images are, you could just try
> mosaicing and see what it looks like (gdal_merge takes the values of
> last image added for overlaps).  If there's a way to standardize
> color values based on brightness, or by RGB bands, that might help,
> either before or after mosaicing. (might depend on if you're dealing
> with multi-band image, or single band? - it would be fairly easy on
> multi-band like Landsat)
> 
> Hope that helps,
> mike
> 
> On Wed, Dec 10, 2014 at 9:28 AM, Andreas Neumann <a.neumann at carto.net>
> wrote:
> 
>> Hi Michael,
>> 
>> I have 4 images with approx 30% overlap in each axis (north/east).
>> I would like to mosaic the images to get a single big images
>> covering the full area.
>> 
>> I hope that the images are nicely blended into each other so I
>> don't see the the seam/border of the original images - I was hoping
>> to get something similar to "enblend/enfuse"
>> (http://enblend.sourceforge.net [1]). I don't think that
>> enblend/enfuse keeps my georefencing - or does it?
>> 
>> Andreas
>> 
>> On 10.12.2014 16:10, Michael Treglia wrote:
>> 
>> Hi Andreas,
>> 
>> Do you mean that you want to effectively create a stack of rasters
>> (i.e., multi-band raster)? If not, we might need some more details.
>> 
>>  If so, the Raster Merge operation (using gdal_warp) should work -
>> go to Raster -> Miscellaneous -> Merge, and check the box for "Layer
>> Stack" (http://www.gdal.org/gdal_merge.html [2]).
>> 
>> You can also do that in SAGA via Import/Export -> GDAL/OGR -> GDAL:
>> Export Raster, and add multiple grids, though this is a bit more
>> constrained and I think needs to have all layers in the same
>> Resolution.
>> 
>> This is also do-able in R using the Raster package, look into
>> "brick", "stack", and "writeRaster"
>> 
>> hope that helps,
>> Mike
>> 
>> On Wed, Dec 10, 2014 at 8:00 AM, Andreas Neumann
>> <a.neumann at carto.net> wrote:
>> Hi,
>> 
>> I georeferenced four overlapping aerial images - with QGIS/GDAL and
>> the thin plate spline method. Now I want to mosaick/blend the
>> overlapping images. Are there any good FOSSGIS tools available that
>> support mosaicking with blending? Perhaps with SAGA/GRASS/OTB? Any
>> recommendations?
>> 
>> Thanks for any pointers/tutorials.
>> 
>> Andreas
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user [3]
> 
> 
> 
> Links:
> ------
> [1] http://enblend.sourceforge.net
> [2] http://www.gdal.org/gdal_merge.html
> [3] http://lists.osgeo.org/mailman/listinfo/qgis-user
> [4] https://trac.osgeo.org/gdal/wiki/Correlator