[GRASS-dev] Calling all imagery (especially i.maxlik and i.smap) users

[Maris Nartiss]

Hello lists (sorry for cross-posting),
as GRASS 8 starts to look less Duke Nukem Forever (a.k.a. never), it
is a chance to change some things in imagery part. Thus if you heavy
relay on imagery part of GRASS GIS, please find some time to give
small feedback.

GRASS 7.8.0 imagery groups gained functionality of fully qualified
maps and thus could be used from other mapsets, still some issues
popped up.

#1 Should there be subgroups at all?
There has been a call to completely eliminate subgroups [1] and stick
only with groups. If you are using subgroups, this is the right moment
to share your user story (and not hypothetical one!).

#2 Should i.maxlik add its output to the group?
Current implementation of i.maxlik adds classification result to the
input group [2]. This prevents use of i.maxlik with imagery group from
other mapset. I would vote to remove such feature. If you have a use
case where such functionality is needed, speak now, or forever hold
your peace.

#3 Should signature files be handled similarly to raster colors?
i.cluster, i.gensig and i.gensigset write signature files to imagery
subrgoup. This is not possible if group is located in other mapset. My
proposal — handle signatures as raster colours — signatures are always
saved in current mapset. Thus signatures created for a group in other
mapset would be not visible in other mapsets.

Thank you in advance for your feedback,
Māris.

1. https://trac.osgeo.org/grass/ticket/3440
2. https://trac.osgeo.org/grass/ticket/3525