[Qgis-user] Batch Aerial Imagery GeoReferencing

[Charles Dixon-Paver]

Just to add to this, QGIS supports using raster images for points with data
driven properties, so with some expression-fu and native tools you can get
decent approximations for images from just exif data. I have wanted to
build a basic template project for the solutions hub but haven't found the
time yet. One issue is that qgis cannot currently distort or "warp" the
raster to the relevant affine parameters, which is where the georeferencing
tool may be used, perhaps using a model. Sadly, scripting the georeferencer
is not that easy, however QGIS does provide a "generate gdal script" for
supported transformations.

There is, however, a community plugin for doing much of this here:
https://verticalphotoplacer.github.io/VerticalPhotoPlacer/

It's a bit clunky to set up and uses external dependencies like exif tools
(3.22 now has a full set of exif expressions so this plugin might be
updated to remove that requirement soon), but it should be functional for
basic usage as I understand the original query. Just be sure to read the
docs.

I'm also not sure how well this would handle large files, you'd probably
need to chunk your data into reasonably sized projects or individual
flights etc.

Just a note that this is in reference to defining and referencing
"footprints" from airstations mostly, although that plugin does provide
some limited visual tools like attempts at mosaicing etc. Pix4D/ AgiSoft
and other commercial software is likely to give you similar results for
mosaics etc from ODM and other SFM tools. If you want to orthorectify you
may be better off just using MicMac directly from commandline, or if you
want to georeference you can simply loop through files with gdal, ossim, or
similar tools.

There are also tools like https://docs.dronedb.app/ for generating image
footprints etc from exif and other tools, although I had pretty limited
success using that toolkit.

Regards


On Mon, 1 Nov 2021 at 14:58, Kirk Schmidt <kirk at nortekresources.com> wrote:

> Hi Richard:
>
> You would require a couple of things:
>
> 1) Camera interior orientation which would include the lens calibration
>
> 2) exterior orientation which would include precise coordinate at time of
> exposure as well as the pitch, roll and yaw of the camera.
>
> 3) the offsets from the camera film or sensor center to the center of the
> aircraft gps antenna.
>
> 4) an accurate DEM or your target area
>
> If you have the above data, you can autoreference your images.
>
> If the images have a high endlap and sidelap, you could use commercial
> software such as Pix4D or  Global Mapper to orthorectify the images based
> on structure from motion.  Check into drone orthorectification software.
>
> Kirk
>
>
>
> On 10/29/2021 9:13 AM, Richard McDonnell wrote:
>
> Afternoon all,
>
> I have access to over 6000 Aerial Images covering Ireland, we also have
> scans of the Flight Paths and Image Orientation and Extents (Scans from
> Paper Maps)
>
> What I was wondering is if there is a way to Batch Georeference all of
> these Images?
>
> Any Ideas, help, guidance welcome. I have thought about maybe even reverse
> engineering the Flight Plan, then using OpenDroneMap to georeference the
> Images.
>
> Regards & Thanks,
>
>
>
> Richard McDonnell
>
> ——
> Richard McDonnell MSc GIS, FME Certified Professional
> *FRM Data Management*
>
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>
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