[GRASS-user] Importing .jpg & georectifying

I have a .jpg screenshot of a Google-Earth Pro view and see that r.in.gdal
supports that file format. However, I have no idea how to structure the
command line for the task.

On the GE view I recorded the geographic coordinates of four
readily-identifiable points and can put them in a v.in.ascii point file for
import

My web searches for the process of saving a GE view as an .kml file were
without success. That would be another option for importing the GE image and
using it as the background for additional layers outlining specific areas.

Pointers to appropriate modules is appreciated.

Regards,

Rich

Hi Rich,

A maybe-easier workflow is to load QGIS with an XYZ Google Satellite base layer, then save to image *with a World File*. That should allow easy import into other tools. https://geogeek.xyz/how-to-add-google-maps-layers-in-qgis-3.html

On 2019-10-18 at 12:52 -07, Rich Shepard <rshepard@appl-ecosys.com> wrote...

I have a .jpg screenshot of a Google-Earth Pro view and see that r.in.gdal
supports that file format. However, I have no idea how to structure the
command line for the task.

On the GE view I recorded the geographic coordinates of four
readily-identifiable points and can put them in a v.in.ascii point file for
import

My web searches for the process of saving a GE view as an .kml file were
without success. That would be another option for importing the GE image and
using it as the background for additional layers outlining specific areas.

Pointers to appropriate modules is appreciated.

Regards,

Rich

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On Fri, 18 Oct 2019, Ken Mankoff wrote:

A maybe-easier workflow is to load QGIS with an XYZ Google Satellite base
layer, then save to image *with a World File*. That should allow easy
import into other tools.
https://geogeek.xyz/how-to-add-google-maps-layers-in-qgis-3.html

Ken,

Good idea. I know that qgis and saga gis can use GE images as raster
underlayers and haven't seen an example using grass. I'll look into learning
qgis.

Regards,

Rich

On Fri, Oct 18, 2019 at 9:52 PM Rich Shepard <rshepard@appl-ecosys.com> wrote:

I have a .jpg screenshot of a Google-Earth Pro view and see that r.in.gdal
supports that file format. However, I have no idea how to structure the
command line for the task.

On the GE view I recorded the geographic coordinates of four
readily-identifiable points and can put them in a v.in.ascii point file for
import

My web searches for the process of saving a GE view as an .kml file were
without success. That would be another option for importing the GE image and
using it as the background for additional layers outlining specific areas.

Pointers to appropriate modules is appreciated.

How about:

i.gcp - Manages Ground Control Points (GCPs) non-interactively.
https://grass.osgeo.org/grass7/manuals/addons/i.gcp.html

Best
Markus

On Sun, 20 Oct 2019, Markus Neteler wrote:

How about:

i.gcp - Manages Ground Control Points (GCPs) non-interactively.
https://grass.osgeo.org/grass7/manuals/addons/i.gcp.html

Markus,

That looks like a good suggestion. I appreciate it.

Regards,

Rich