Add flag to ignore NULL values in r.cross

[pvanbosgeo]

Feature request: an option in r.cross to ignore raster cells where one or more input maps have NULL (no-data) value.

[annakrat]

Is this duplicate of #1674?

[pvanbosgeo]

Replying to annakrat:

Is this duplicate of #1674?

I think the problem in ticket #1674 was a bug, which I think has been resolved since?

This ticket is more an enhancement request. The current behaviour of r.cross seems to be that NULL values are treated as a category. If that is indeed the correct behaviour, I would suggest to add a flag similar to the -z flag, but for NULL instead of 0 (zero) values. So, the description of this flag (let's use the -n flag)

With the -n flag NULL values are not crossed. This means that if a NULL value occurs in any input data layer, the combination is NULL (no category) in the resulting map layer, even if other data layers contain non-NULL data.

I would in fact have expected the above (an output layer is NULL where one or more layers have a NULL value) to be the default / more logical behaviour.

[martinl]

Milestone renamed

[neteler]

Ticket retargeted after milestone closed

[martinl]

All enhancement tickets should be assigned to 7.6 milestone.

[martinl]

Ticket retargeted after milestone closed

[martinl]

Ticket retargeted after milestone closed