What happens when gdal_merge processes overlapped images?

[cgsbob]

I would like to request that this question in answered in the man pages and website.

[warmerdam]

Bob,

In areas of overlap the last image will be copied over earlier ones.

Perhaps you could like to propose specific changes to specific pages based on that?

[cgsbob]

Replying to warmerdam:

Bob,

In areas of overlap the last image will be copied over earlier ones.

Perhaps you could like to propose specific changes to specific pages based on that?

Frank,

In ​http://www.gdal.org/gdal_merge.html and in man/man1/gdal_merge.1, it says:

This utility will automatically mosaic a set of images. All the images must be in the same coordinate system and have a matching number of bands, but they may be overlapping, and at different resolutions.

There will be people who might guess that gdal_merge might do an average where there is overlap and others who would guess correctly that one image would copy over the other image. I was actually hoping that it would take an average.

[Even Rouault]

Frank's precision added in r16210