Re: [GRASS-user] Filling sinks w/ minimum slope

2017-06-20 Thread Ken Mankoff
On 2017-06-20 at 08:45, Markus Metz wrote: > Negative values in the drainage direction should only occur at the > borders of the current region and around NULL cells. Note that if you > want internal sinks to be drained, you must not use the depression > option. I was not using depression option

Re: [GRASS-user] Filling sinks w/ minimum slope

2017-06-20 Thread Stefan Blumentrath
[mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of Ken Mankoff Sent: mandag 19. juni 2017 18.36 To: GRASS user list Subject: [GRASS-user] Filling sinks w/ minimum slope Hi GRASS list, I'm interested in filling sinks in a DEM before using r.watershed. I currently use r.fill.dir. I've disco

Re: [GRASS-user] Filling sinks w/ minimum slope

2017-06-20 Thread Markus Metz
On Tue, Jun 20, 2017 at 10:05 AM, Ken Mankoff wrote: > > > On 2017-06-20 at 06:28, Markus Metz wrote: > > You don't need to fill sinks with r.watershed, internal sinks are by > > default drained. > > I have negative values in the drainage direction raster produced by r.watershed in the interior.

Re: [GRASS-user] Filling sinks w/ minimum slope

2017-06-20 Thread Ken Mankoff
On 2017-06-20 at 06:28, Markus Metz wrote: > You don't need to fill sinks with r.watershed, internal sinks are by > default drained. I have negative values in the drainage direction raster produced by r.watershed in the interior. Is this a bug? Or am I misunderstanding the definition of a sink

Re: [GRASS-user] Filling sinks w/ minimum slope

2017-06-19 Thread Markus Metz
On Mon, Jun 19, 2017 at 10:35 PM, Ken Mankoff wrote: > > > On 2017-06-19 at 18:20, Stefan Blumentrath wrote: > > To my knowledge r.watershed does not require to fill sinks in advance, > > because it has a minimal impact routing for handling (non-real) sinks. > > > > Do you have a particular reaso

Re: [GRASS-user] Filling sinks w/ minimum slope

2017-06-19 Thread Ken Mankoff
On 2017-06-19 at 18:20, Stefan Blumentrath wrote: > To my knowledge r.watershed does not require to fill sinks in advance, > because it has a minimal impact routing for handling (non-real) sinks. > > Do you have a particular reason for your wish to fill the DEM in > advance? If I don't fill it,

[GRASS-user] Filling sinks w/ minimum slope

2017-06-19 Thread Ken Mankoff
Hi GRASS list, I'm interested in filling sinks in a DEM before using r.watershed. I currently use r.fill.dir. I've discovered that the SAGA fill command has an option to set a "Minimum slope gradient to preserve from cell to cell; with a value of zero sinks are filled up to the spill elevation