#2563 closed enhancement (invalid)
r.grow.distance: define max distance
| Reported by: | mlennert | Owned by: | |
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| Priority: | normal | Milestone: | 7.2.0 |
| Component: | Raster | Version: | svn-trunk |
| Keywords: | r.grow.distance maximum distance | Cc: | |
| CPU: | Unspecified | Platform: | Unspecified |
Description
It would be nice if r.grow.distance allowed to define a maximum distance. The module could then stop calculating once this maximum distance is attained (e.g. similar to r.cost's max_cost option). This should probably accelerate the module if only short distances are needed from the starting points.
Change History (3)
follow-up: 2 comment:1 by , 10 years ago
comment:2 by , 10 years ago
| Resolution: | → invalid |
|---|---|
| Status: | new → closed |
Replying to glynn:
Replying to mlennert:
It would be nice if r.grow.distance allowed to define a maximum distance. The module could then stop calculating once this maximum distance is attained (e.g. similar to r.cost's max_cost option). This should probably accelerate the module if only short distances are needed from the starting points.
It wouldn't have the slightest effect upon performance. r.grow.distance doesn't operate in order of increasing distance. It operates row-by-row in two passes, from top-to-bottom then bottom-to-top, recording the distance to the closest point seen so far.
Ok, so the only way to limit the distance is to determine the smallest region that would include the max distance.
Closing this as invalid.
Replying to mlennert:
It wouldn't have the slightest effect upon performance. r.grow.distance doesn't operate in order of increasing distance. It operates row-by-row in two passes, from top-to-bottom then bottom-to-top, recording the distance to the closest point seen so far.