[GRASS-user] Contours

of doing this? Thanks -- Le gach dea ghui, *Shane Carey* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] grass-user Digest, Vol 140, Issue 28

-0800 (PST) > From: Rich Shepard <rshep...@appl-ecosys.com> > To: grass-user grass-user <grass-user@lists.osgeo.org> > Subject: Re: [GRASS-user] Contours > Message-ID: > <alpine.lnx.2.20.1712180935300.32...@salmo.appl-ecosys.com> > Content-Type: te

Re: [GRASS-user] grass-user Digest, Vol 140, Issue 28

Hi, Unfortunately I could not get that to work. Any other suggestions? Cloud processing perhaps? On Luan 18 Noll 2017 at 20:17, Shane Carey <careys...@gmail.com> wrote: > Super, thanks > > On Mon, Dec 18, 2017 at 8:00 PM, <grass-user-requ...@lists.osgeo.org> > wro

[GRASS-user] Level LiDAR data to gps points

Hi, I have some LiDAR data that was not levelled properly and I was wondering does anybody know of a way of levelling the las files to gps points? Thanks in advance -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass-user

[GRASS-user] r.watershed

Hi, I am trying to extract river network from a 5m DEM with some success using r.watershed. Has anyone tested this algorithm on high resolution LiDAR data for example - 1meter DTM and what kind of results have they obtained? Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions

[GRASS-user] Snapping two different polyline layers

Hi, Does anybody know if it is possible to snap one polyline layer to another? The reason I ask is because, one of my polylines does not align exactly with the other where they are in close proximity to each other! Many thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions

Re: [GRASS-user] r.watershed

eat question and I also wonder how you did. Short ago I knew >>> about Itzï and its ability to do it with SWMM >>> http://itzi.readthedocs.io/en/latest/tutorial.html#culvert-modelling. >>> Looking forward to testing it >>> -- >>> Marco >>> >

Re: [GRASS-user] r.watershed

ontinuous drainage network model, especially in these difficult > areas. > > Happy Modeling! > > Mark > > On Tue, Dec 5, 2017, 3:49 PM Shane Carey <careys...@gmail.com> wrote: > >> Hi, >> >> I am trying to extract river network from a 5m DEM with s

Re: [GRASS-user] r.watershed

ith SWMM > http://itzi.readthedocs.io/en/latest/tutorial.html#culvert-modelling. > Looking forward to testing it > -- > Marco > > 2017-12-06 9:24 GMT+01:00 Shane Carey <careys...@gmail.com>: > >> Hi Mark, >> >> Thanks for your reply! Sounds great. >> How did you ad

[GRASS-user] Stream order from existing stream network layer

;* Thanks in advance Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] Stream order from existing stream network layer

Super - thank you! I will give this a go first and get back to you if I get stuck. Thanks again. Cheers Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Tue, May 1, 2018 at 12:01 PM, Stefan Blumentrath < stefan.blumentr...@nina.no> wrote: > Hi Shane, > &

[GRASS-user] Least cost search algorithm

Hi, Just wondering when was the least cost search algorithmic (r.watershed) implemented into GRASS Gis? Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass-user mailing list grass-user@lists.osgeo.org https

[GRASS-user] r.stream.slope

gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

[GRASS-user] r.watershed

s and flow accumulations - Are these just an added bonus? Thanks -- Le gach dea ghui, *Shane Carey* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

[GRASS-user] r.stream.segment

Hi All, I am using the r.stream.segment module and I was wondering could anyone tell me what is the difference between azimuth and direction in the attribute table information! Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant

Re: [GRASS-user] Level LiDAR data to gps points

a raster map name instead of a constant). > > On Wed, Dec 27, 2017 at 5:22 PM, Shane Carey <careys...@gmail.com> wrote: > >> Oh super Vaclav, is there a way of doing a spatially variable shift or >> can you only do a block shift? >> >> Thanks for yo

[GRASS-user] LiDAR dtm analysis

) and some were conducted during the summer (Hence bog shrivels due to a lack of rain). I was wondering would anyone know if or have any ideas on a way to normalise the dtms to one level so that we can compare like with like. Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions

Re: [GRASS-user] LiDAR in Grass GIS

Ok great - I will try that! Thanks On Céad 21 Márta 2018 at 11:55, Martin Landa <landa.mar...@gmail.com> wrote: > Hi, > > [please keep discussion on ML] > > 2018-03-21 11:39 GMT+01:00 Shane Carey <careys...@gmail.com>: > > ERROR: Projection of dataset does not

[GRASS-user] LiDAR in Grass GIS

Hi, I am trying to bring in the following LiDAR dataset into grass GIS: https://geo.nyu.edu/catalog/nyu_2451_38621 and I keep getting a projection error, even-though the dataset is projected. Any ideas on how to get around this? Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data

Re: [GRASS-user] LiDAR in Grass GIS

, Martin Landa <landa.mar...@gmail.com> wrote: > Hi, > > 2018-03-21 11:20 GMT+01:00 Shane Carey <careys...@gmail.com>: > > I am trying to bring in the following LiDAR dataset into grass GIS: > > https://geo.nyu.edu/catalog/nyu_2451_38621 > > > > and I

Re: [GRASS-user] floodplain creation

Hi, Is there anyway of the algorithm just being able to create a floodlain for actual real rivers as opposed to the derived river dataset? Thanks On Máirt 25 MFómh 2018 at 15:49, Shane Carey wrote: > Image attached shows rivers (black line) and floodplain of where it thinks > there are

[GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

slide and slide two is what I hope to end up with. https://docs.google.com/presentation/d/1x7IQ3BJlLLSb6R2atxIIiaeWzyCqCZQ3uWaGPZyo6ds/edit?usp=sharing Any help would be appreciated. Thanks in advance. Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

Just one quick thing, do you know if dleft and dright can snap to the polygon edge? Thanks On Domh 14 DFómh 2018 at 23:30, Shane Carey wrote: > Super, thanks Johannes. I'll check it out and see how it works. > Super - thanks > > On Domh 14 DFómh 2018 at 23:15, Johan

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

s/v.transects.html > The manual says: "Creates transect lines or quadrilateral areas at regular > intervals perpendicular to a polyline." > > HTH > Johannes > > On Sun, Oct 14, 2018 at 11:28 PM Shane Carey wrote: > >> Hi, >> >> I need to cut a floodplain

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

Hi All, I don't think v.transects is going to work for me as lines appear to be cutting across each other. Is there another tool in Grass that can cut the floodplain polygon into 5m lengths (as green lines in image attached) Thanks On Luan 15 DFómh 2018 at 15:38, Shane Carey wrote: > Gr

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

Great thanks, is there anything available that will snap these lines to the polygon edges? Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Mon, Oct 15, 2018 at 3:30 PM Markus Neteler wrote: > On Sun, Oct 14, 2018 at 11:28 PM Shane Carey wrote: > &g

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

What about obtaining the main direction of the river (North - South/ East- West) and creating the rows/columns based on that? Any advice/ help would be appreciated! Thanks all Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Tue, Oct 16, 2018 at 7:49 AM Shane Carey wrote

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

? https://docs.google.com/presentation/d/1x7IQ3BJlLLSb6R2atxIIiaeWzyCqCZQ3uWaGPZyo6ds/edit?usp=sharing Or if you think there is a better way of reaching my end goal (slide 2), I would be interested in hearing your thoughts. Thanks Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

8c0552_0_0 Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Tue, Oct 16, 2018 at 10:45 AM Shane Carey wrote: > What about obtaining the main direction of the river (North - South/ East- > West) and creating the rows/columns based on that? Any ad

Re: [GRASS-user] Cut a floodplain polygon with 1meter wide polygons perpendicular to its river channel

Had another brainwave. Is it possible to create a perpendicular line at every vertex that makes up the river line segment? Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Tue, Oct 16, 2018 at 6:15 PM Shane Carey wrote: > Hi All, > > I am getting closer

Re: [GRASS-user] floodplain creation

super - thanks again [Since you already have the streams and you want to use them, you need to convert them to raster and then also get stream direction for r.stream.distance by reclassifying, e.g. with r.mapcalc] Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Fri, Sep

Re: [GRASS-user] floodplain creation

t sure what is going on here - have you any ideas on this? Also, could you explain a little about what this expression is doing: (streams_direction + 45) / 45) Thanks Vaclav Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Mon, Oct 1, 2018 at 4:29 PM Vaclav Petras wrote:

[GRASS-user] floodplain creation

meters of water in every cell along the river network. Any advice on this would be great. It is for the creation of a floodplain. Thanks Le gach dea ghui, *Shane Carey* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org

Re: [GRASS-user] Elevation above a river

No worries, I'm not seeing any differences in the original and the filtered cells. I've tried mode and max methods Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Sat, Sep 22, 2018 at 2:39 PM, johannesradinger < johannesradin...@gmail.com> wrote: > Sor

Re: [GRASS-user] Elevation above a river

Would you be able to give me an example of this please? This software is really really good. I absolutely love it. Keep up the great work!! Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Sat, Sep 22, 2018 at 3:25 PM, johannesradinger < johannesradin...@gmail.com>

Re: [GRASS-user] Elevation above a river

This works a treat - super stuff - thanks Johannes. Could you point me in the direction of an algorithim with Grass that can do the following: # Clean some of the spurious cells etc. (using some kind of neighbourhood filtering) Thanks very much Le gach dea ghui, *Shane Carey* *GIS and Data

Re: [GRASS-user] floodplain creation

Hi All, This works well, but doesn't capture every river - is it a case of making the threshold value smaller or making a deeper carve in the rivers??? Thanks in advance - I think this method would will work well, if it were able to "flood" all rivers. Thanks Le gach dea ghui, *S

Re: [GRASS-user] floodplain creation

ow need to pour 3meters of water into every cell in the river and >> see how for this water extends out - onto the floodplain. >> >> I was trying to use r.lake to do this, but unsure as to how r.lake will >> work to pour 3 meters of water in every cell along the river network.

Re: [GRASS-user] floodplain creation

Yes, this is the problem - there is not exact stream matching with the ones derived on the carved DEM with the "Real" rivers. Any advice on how to get around that? Thanks Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Tue, Sep 25, 2018 at 3:53 AM, Vaclav Pet

Re: [GRASS-user] floodplain creation

Image attached shows rivers (black line) and floodplain of where it thinks there are rivers and in some cases where there may not be rivers. Cheers Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Tue, Sep 25, 2018 at 3:45 PM, Shane Carey wrote: >

[GRASS-user] Sentinel2- flooding

Hi, I've obtained an image from sentinel2 where it shows flooding. Just wondering are there tools in Grass to classify an image in order to pull out these "flooded" pixels? Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions

Re: [GRASS-user] Sentinel2- flooding

Ok, thanks. Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Fri, Dec 7, 2018 at 2:45 PM Roberto Marzocchi < roberto.marzoc...@gmail.com> wrote: > I Think there isn't any tool pre-configured. You need to find an index to > calculate "flooded" cells a

Re: [GRASS-user] Sentinel2- flooding

r, Sentinel-1 would have to be pre-processed in SNAP/gpt. > > > > Cheers > > Stefan > > > > *From:* grass-user *On Behalf Of *Shane > Carey > *Sent:* fredag 7. desember 2018 17:35 > *To:* roberto.marzoc...@gmail.com > *Cc:* grass-user grass-user >

Re: [GRASS-user] Sentinel2- flooding

-processed in SNAP/gpt. > > Yes, Sentinel-1 is probably more relevant when it comes to > identification of flooded areas. > > Markus > -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

[GRASS-user] Elevation above a river

of the channel and create a polygon from it. Thanks all. Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] Elevation above a river

e raster cells of the elevation map that represents > the river channel, (2) then apply r.grow and (3) then r.mapcalc to subtract > the grown river channel from the original elevation map. > /Johannes > > On Sun, Sep 16, 2018 at 5:16 PM Markus Neteler wrote: > >> Hi, >>

Re: [GRASS-user] Elevation above a river

5:16 PM Markus Neteler wrote: > >> Hi, >> >> Shane Carey schrieb am Fr., 14. Sep. 2018, 23:02: >> >>> Hi All, >>> >>> Does anyone know is it possible to calculate the elevation above a river >>> channel (actual river network that was

Re: [GRASS-user] Elevation above a river

river channel, (2) then apply r.grow and (3) then r.mapcalc to subtract > the grown river channel from the original elevation map. > /Johannes > > On Sun, Sep 16, 2018 at 5:16 PM Markus Neteler wrote: > >> Hi, >> >> Shane Carey schrieb am Fr., 14. Sep. 2018, 23:02: >

Re: [GRASS-user] Elevation above a river

of x?)? If so, this is exactly what I need. Thanks On Luan 17 MFómh 2018 at 04:22, Vaclav Petras wrote: > Hi Shane, > > On Fri, Sep 14, 2018 at 5:03 PM Shane Carey wrote: > >> >> Does anyone know is it possible to calculate the elevation above a river >>

[GRASS-user] Split polygons with lines

Hi, I've been looking for ways of grass gis splitting a polygon into multiplepolygons with a line shapefile and wondering are there tools in Grass to do this!! Thanks -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* ___ grass

Re: [GRASS-user] Split polygons with lines

Thanks Markus, it doesnt seem to do the trick for me unfortunately. Thanks for your help Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Sun, Mar 10, 2019 at 8:35 PM Markus Neteler wrote: > On Sun, Mar 10, 2019 at 3:39 PM Shane Carey wrote: > > > > Hi, &g

[GRASS-user] Import grass.script

GISBASE="$(grass76 --config path)" export PATH="$PATH:$GISBASE/bin:$GISBASE/scripts" export DYLD_LIBRARY_PATH="$LD_LIBRARY_PATH:$GISBASE/lib" export GIS_LOCK=$$ export GISRC="$HOME/.grass7/rc" export PYTHONPATH="$PYTHONPATH:$GISBASE/etc/python" Le ga

Re: [GRASS-user] Import grass.script

i... > > Cheers, > Stefan > -- > *From:* grass-user on behalf of > Shane Carey > *Sent:* Sunday, April 7, 2019 1:35:11 AM > *To:* grass-user grass-user > *Subject:* [GRASS-user] Import grass.script > > Hi, > > I am trying to write an e

Re: [GRASS-user] Split polygons with lines

output = r"C:\Users\shane.carey\Desktop\split2.shp" processing.run("saga:polygonlineintersection",{ 'POLYGONS':polys, 'LINES':lines,'INTERSECT':output}) Cheers Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant* On Fri, Mar 15, 2019 at 2:21 PM Moritz Lennert wrote:

[GRASS-user] Georeferencing and mosaicing

Hi All, I'm looking for some advice - I have a set of non georeferenced aerial images that I need to georeference and mosaic together. Do you know if it is possible to do all of this within Grass GIS or what is the best tool to undertake this task? Thanks in advance for your help

Re: [GRASS-user] Georeferencing and mosaicing

Super, thank you so much for this Markus. Thanks On Tue, Jul 7, 2020 at 11:47 AM Markus Neteler wrote: > Hi Shane, > > Shane Carey schrieb am Di., 7. Juli 2020, 10:58: > >> Hi All, >> >> I'm looking for some advice - I have a set of non georeference

Re: [GRASS-user] Georeferencing and mosaicing

Hi, Thanks for the reply earlier - is there a way of doing colour corrections/balancing of mosaic of images in grass gis also? Thanks again for your help On Tue, Jul 7, 2020 at 11:58 AM Shane Carey wrote: > Super, thank you so much for this Markus. > > Thanks > > > On Tue,