Re: [Qgis-user] Georeferencing images

[Jorge Gustavo Rocha]

Hi,

I use OpenDroneMap [1] for that. Using ODM you get the orthophotomap and
several other useful things (like the DEM).

Regards,

Jorge

[1] https://www.opendronemap.org/

On 10/07/20 15:29, blubee blubeeme wrote:
> Id like to thank the few users who helped me with my previous question.
>
> It seems like georeferencing will me more work than I initially
> anticipated. 
>
> Can anyone give me a quick overview of a pipeline to go from uav
> images with embedded GPS coordinates to a series of stitched maps. 
>
> The area that I'm working on lacks features since it's all mountains
> with trails that aren't visible from above. 
>
> I could go into certain flat areas and use Garmin device to place
> makers, that's the most accurate method that I could use to place makers. 
>
> Any tips would be greatly appreciated. 
>
> Best
>
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Re: [Qgis-user] Georeferencing images

[Saber Razmjooei]

Hi

In the past, we developed a private plugin for georeferencing and
stitching multiple UAV images, similar to ENVI software workflow.

If you are dealing with an area where the elevation changes significantly,
best to follow the discussion here:
https://github.com/qgis/QGIS/pull/36385

As my colleague, Martin suggested, we may need to improve the current
Georeferencer plugin to make use of RPC_DEM.

Kind regards
Saber

On Fri, 10 Jul 2020 at 15:41, Nicolas Cadieux 
wrote:

> Hi,
>
> If the images have embedded GPS coordinates, all you need to do is drag
> and drop the rasters in QGIS.  If you have coordinates but no CRS, you may
> need to indicate the which Coordinates Reference System to use (Probably
> WGS84) depending on your settings.  You can install a plugin like quickmap
> and load a background image.  That will help you figure out if the image
> are georeferenced correctly.  Look at your coordinates in the lower right
> corner.  You can use that to figure out if you are in meters or in degrees.
>
> Nicolas Cadieux
> Ça va bien aller!
>
> > Le 10 juill. 2020 à 10:22, blubee blubeeme  a
> écrit :
> >
> > 
> > Id like to thank the few users who helped me with my previous question.
> >
> > It seems like georeferencing will me more work than I initially
> anticipated.
> >
> > Can anyone give me a quick overview of a pipeline to go from uav images
> with embedded GPS coordinates to a series of stitched maps.
> >
> > The area that I'm working on lacks features since it's all mountains
> with trails that aren't visible from above.
> >
> > I could go into certain flat areas and use Garmin device to place
> makers, that's the most accurate method that I could use to place makers.
> >
> > Any tips would be greatly appreciated.
> >
> > Best
> > ___
> > Qgis-user mailing list
> > Qgis-user@lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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-- 
Saber Razmjooei
www.lutraconsulting.co.uk
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Re: [Qgis-user] Georeferencing images

[Nicolas Cadieux]

Hi,

If the images have embedded GPS coordinates, all you need to do is drag and 
drop the rasters in QGIS.  If you have coordinates but no CRS, you may need to 
indicate the which Coordinates Reference System to use (Probably WGS84) 
depending on your settings.  You can install a plugin like quickmap and load a 
background image.  That will help you figure out if the image are georeferenced 
correctly.  Look at your coordinates in the lower right corner.  You can use 
that to figure out if you are in meters or in degrees.

Nicolas Cadieux
Ça va bien aller!

> Le 10 juill. 2020 à 10:22, blubee blubeeme  a écrit :
> 
> 
> Id like to thank the few users who helped me with my previous question.
> 
> It seems like georeferencing will me more work than I initially anticipated. 
> 
> Can anyone give me a quick overview of a pipeline to go from uav images with 
> embedded GPS coordinates to a series of stitched maps. 
> 
> The area that I'm working on lacks features since it's all mountains with 
> trails that aren't visible from above. 
> 
> I could go into certain flat areas and use Garmin device to place makers, 
> that's the most accurate method that I could use to place makers. 
> 
> Any tips would be greatly appreciated. 
> 
> Best
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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[Qgis-user] Georeferencing images

[blubee blubeeme]

Id like to thank the few users who helped me with my previous question.

It seems like georeferencing will me more work than I initially
anticipated.

Can anyone give me a quick overview of a pipeline to go from uav images
with embedded GPS coordinates to a series of stitched maps.

The area that I'm working on lacks features since it's all mountains with
trails that aren't visible from above.

I could go into certain flat areas and use Garmin device to place makers,
that's the most accurate method that I could use to place makers.

Any tips would be greatly appreciated.

Best
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Re: [Qgis-user] Georeferencing images

[Richard Duivenvoorde]

There is also the

Freehand raster georeferencer pluguin:

http://plugins.qgis.org/plugins/FreehandRasterGeoreferencer/

as an alternative to do 'easy' visual georeferencing.

I think it is quite promissing

Regards,

Richard Duivenvoorde

On 07/21/2018 09:26 PM, Nicolas Cadieux wrote:
> Hi,
> Play with the placement algorithms.  Start with  the basic Helmert with 2 or 
> more points. Anything more than 2 points and you will see where the 
> distortions come from and give you an idea of what your are dealing with.   
> Finish with Thin Plate Spline (TPS).
> Nicolas
> 
>> Le 21 juill. 2018 à 14:33, Wolstan H M Dixie  a 
>> écrit :
>>
>> Thanks everyone - I discovered the Plugin! However it takes a bit of 
>> practice, and sometimes it fails to position the image correctly - I 
>> think it needs more that 4 points, probably about 8, to work properly.
>>
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Re: [Qgis-user] Georeferencing images

[Nicolas Cadieux]

Hi,
Play with the placement algorithms.  Start with  the basic Helmert with 2 or 
more points. Anything more than 2 points and you will see where the distortions 
come from and give you an idea of what your are dealing with.   Finish with 
Thin Plate Spline (TPS).
Nicolas

> Le 21 juill. 2018 à 14:33, Wolstan H M Dixie  a 
> écrit :
> 
> Thanks everyone - I discovered the Plugin! However it takes a bit of 
> practice, and sometimes it fails to position the image correctly - I 
> think it needs more that 4 points, probably about 8, to work properly.
> 
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[Qgis-user] Georeferencing images

[Wolstan H M Dixie]

Thanks everyone - I discovered the Plugin! However it takes a bit of 
practice, and sometimes it fails to position the image correctly - I 
think it needs more that 4 points, probably about 8, to work properly.

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