[Qgis-user] Mosaicking aerial images

[Bruce, Bob (CWS)]

Hi Andreas,

I wrote a QGIS python plugin a number of years ago for merging overlapping imagery, it can be found at: http://www.mappinggeek.ca/QGISPythonPlugins/ under the title Image Clipper. I developed it for my day job where our map/photo sales people wanted to georeferenced and merge aerial photography for map photo bases. Our staff continue to use this plugin to merge georeferenced photography. This plugin has never been upgraded to QGIS version 2, at some point I would like to tackle that but I haven't done any python development in QGIS for a couple of years so I'm leery of that.

You might want to investigate OSSIM as I believe that it has tools for merging and colour balancing of overlapping images.

	Bob Bruce

-----Original Message-----
From: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of Andreas Neumann
Sent: December-10-14 12:38 PM
To: Michael Treglia
Cc: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Mosaicking aerial images

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
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