Georeferencing images

You may have orthomosaics that show an area pretty well, but the image itself isn't georeferenced, so when you open them in google earth they don't get visualized in the correct location. Or you may have an orthomosaic that was processed before, but the processing at that time didn't use very precise control points, so the referencing is a couple of meters off.

You do not necessarily need to re-fly that area to improve on the coordinates. QGIS and other GIS tools can geo-reference the raster image for you, so that you can save it as a GeoTIFF for example with the reference coordinates in the image.

I found this photo online from an area near yorkshire (knaresborough). It's just a JPEG shot pretty much straight down, not georeferenced at all:

General workflow The workflow is explained here: http://www.qgistutorials.com/en/docs/georeferencing_basics.html

Result:

and a report of the transformation:

Interesting ideas

It should be possible to create orthomosaics of different bands of the same location, even in different flights, and then georeference them together and merge the bands. If you were to do this picture by picture, there may not be substantial overlap between pictures. Once the bands are joined together in a larger image, it should be possible to use mathematical functions between them (like NDVI and other operations).