Re: [GRASS-user] i.atcor and Py6S

On 09/11/15 18:11, Panagiotis Mavrogiorgos wrote: Hi everyone, I have a couple of questions with regard to i.atcor: 1. Unless I am mistaken, GRASS uses its own implementation of the 6S algorithm. Is that accurate? Yes. 2. If it is, which version of the 6S algorithm has been implemented?

Re: [GRASS-user] i.atcor and Py6S

On Thu, Nov 12, 2015 at 10:30 AM, Moritz Lennert < mlenn...@club.worldonline.be> wrote: > On 09/11/15 18:11, Panagiotis Mavrogiorgos wrote: > > 2. If it is, which version of the 6S algorithm has been implemented? >> > > I don't think that the basic algorithm was changed since its origin in >

Re: [GRASS-user] i.atcor and Py6S

Panagiotis Mavrogiorgos wrote: > > Hi everyone, > > I have a couple of questions with regard to i.atcor: > > 1. Unless I am mistaken, GRASS uses its own implementation of the 6S > > algorithm. Is that accurate? Moritz Lennert: > Yes. > > 2. If it is, which version of the 6S algorithm has

[GRASS-user] Automatic extraction of valley features

Hi, I would like to know how to extract a valley feature from a DEM as a polygon : the wanted result isn't equal to a watershed or a sub-basin, it is the cumulated shape of the two slopes and the bottom where the stream is located. As I do not master the geomorphological vocabulary, here is

Re: [GRASS-user] Automatic extraction of valley features

Hi, On Thu, Nov 12, 2015 at 5:09 AM, Jean-Roc Morreale wrote: > I would like to know how to extract a valley feature from a DEM as a > polygon The classic way would be to use r.param.scale with method=feature, but I would recommend using r.geomorphon by Stepinski and

Re: [GRASS-user] Automatic extraction of valley features

Hi, Something to have in mind is that your definition of a valley will be heavily scale dependent, e.g. what depth and width (and possibly even length) do you consider as a valley. As a consequence, also results from r.param.scale and r.geomorphon are likewise scale dependent (where scale is -

Re: [GRASS-user] i.atcor and Py6S

On 12/11/15 10:31, Nikos Alexandris wrote: Panagiotis Mavrogiorgos wrote: Hi everyone, I have a couple of questions with regard to i.atcor: 1. Unless I am mistaken, GRASS uses its own implementation of the 6S algorithm. Is that accurate? Moritz Lennert: Yes. 2. If it is, which version

Re: [GRASS-user] Automatic extraction of valley

; > Note that r.geomorphon module is in GRASS Addons repository, so use e.g., > g.extension r.geomorphon to get it. > > Vaclav > > https://grass.osgeo.org/grass70/manuals/r.param.scale.html > https://grass.osgeo.org/grass70/manuals/addons/r.geomorphon.html > -- n

Re: [GRASS-user] Automatic extraction of valley features

Thank you Vaclav and Stefan, I'm trying r.geomorphon which seems to be quite a great tool r.geomorphon -m dem=DEM@hydro forms=geoform search=900 skip=0 flat=1 dist=0 r.mapcalc "DEM_valley = if(geoform == 9, 1, null())" here is a result -> https://goo.gl/XChymf This example shows what Stefan

Re: [GRASS-user] Automatic extraction of valley

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Re: [GRASS-user] GRASS Plugin ready

Another bug you should know about: http://hub.qgis.org/issues/13815 - attributes of a vector imported in browser may be messed up. Fixed in master and 2.12 branch (will be in 2.12.1). Radim On Sun, Nov 1, 2015 at 10:09 PM, Radim Blazek wrote: > Hi all, > > I would like