Re: [GRASS-user] Re: Drivetime Isochrones
[You seem to have gotten beyond some of your troubles, but just for the record, some answers.] On 20/06/11 05:50, RKiTect wrote: Thanks for your help... unfortunately i am using the GUI and i must have an input for the 'nodes' section. Which module are you speaking about ? Neither v.net nor v.net.iso have a 'nodes' parameter. my centre layer doesn't show up for inputting into this... so i think my point file requires some sort of pre-processing, but not sure... You have to connect your points to the streets using v.net. By default this will add the points as nodes to the street network and these nodes will have category values in layer 2. v.net.iso will by default look for these category values in layer 2, so you normally don't have to worry about the layers. if you try running the gui tool you will see what i mean... inputs required for arcs and nodes, but a standard grass pointfile does not show up in nodes dropdown box... What do you mean by standard grass pointfile ? Your points have to be a vector layer. So, if you have them as an ascii file in the classic grass point format, you have to import it with v.in.ascii first. Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] How to plot arrows style of speed and direction of wind...
Dear grass user Recently, I am feeling sorry for many questions I'm looking for how to plot arrows of speed and direction of wind. for example, if station A has 4m/s and Eest (degree 90 )of annual average wind situation, the plot like arrow style; xA Other hand, if station B has 2m/s and West (degree 270 ) of annal average wind situation, the plot also like arrow style: Bx-- ...and so on. In this case, data set is as follows; station | lat | lon | w.speed | w.direction | tokyo | 35.2| 25.4| 4.0 | 90 | osaka | 24.5| 33.9| 2.0 | 270 | ... w.speed is single and w.direction is integer. Wind direciotn ranges between 1 (=north), 90 (=east), 180 (=south), 270 (=west) and 360 (=north). I think that this data set can import to vector data by using v.in.ascii... So, I'm looking for command -- d.vect --, but can not find to arrows style of speed and direction of wind...I think that it is difficult to show an arrow st yle by using two properties (=two columns, speed and direction ) Please teach me if there is profitable information... Yasuo shimada ( japan weather association ) ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Re: Monte Carlo realizations of categorical maps.
Hamish wrote: also, for a categorical map you might try r.to.vect + the v.random.cover module for GRASS 6 from addons: http://grass.osgeo.org/wiki/Addons#v.random.cover v.random.cover is a shell script for creating random points constrained within an irregularly shaped vector area. (v.random places points only in current region rectangle). Optionally the user can upload raster values at the points. See also 'r.random cover= vector_output=' Thanks for your comments Hammish. I am not sure how to do it this way, but yes, there is probably a workaround. For now, I will just wait for a response from the author. Rainer: so why not contact the author? Hamish: (he still emails comments from time to time, so your chances are good. let me know if the email you tried was too old, I may have a newer one somewhere) I tried: charles.r.ehlschlae...@usace.army.mil Let's see if it works. Thanks a lot, Marcello. -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Monte-Carlo-realizations-of-categorical-maps-tp6502447p6508407.html Sent from the Grass - Users mailing list archive at Nabble.com. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] How to plot arrows style of speed and direction of wind...
On 23/06/11 16:03, sgw00...@nifty.com wrote: Dear grass user Recently, I am feeling sorry for many questions I'm looking for how to plot arrows of speed and direction of wind. for example, if station A has 4m/s and Eest (degree 90 )of annual average wind situation, the plot like arrow style; xA Other hand, if station B has 2m/s and West (degree 270 ) of annal average wind situation, the plot also like arrow style: Bx-- ...and so on. In this case, data set is as follows; station | lat | lon | w.speed | w.direction | tokyo | 35.2| 25.4| 4.0 | 90 | osaka | 24.5| 33.9| 2.0 | 270 | ... w.speed is single and w.direction is integer. Wind direciotn ranges between 1 (=north), 90 (=east), 180 (=south), 270 (=west) and 360 (=north). I think that this data set can import to vector data by using v.in.ascii... So, I'm looking for command -- d.vect --, but can not find to arrows style of speed and direction of wind...I think that it is difficult to show an arrow st yle by using two properties (=two columns, speed and direction ) You can use rot_column to define rotation and size_colum to define size depending on speed. But this is size, not length... Use icon= for defining a symbol (see [1] for examples). But you might be better off using a raster approach and d.rast.arrow. See example at [2]. Or check out Hamish' d.barb AddOn module [3]. Moritz [1] http://grass.osgeo.org/wiki/IconSymbols [2] http://grass.osgeo.org/wiki/Meteorology [3] http://grass.osgeo.org/wiki/GRASS_AddOns#d.barb ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
