I'm having trouble finding out if I can input vector points in a
different coordinate system other then Lat/Long. I'm trying to use
the Irish Grid system since all of my information is already in that
format. Is this possible, or will I have to convert all of my points
from the Irish grid to lat/long?
Bryan
i would like to create a vector map with vectors rapresenting the slope...
i need to create these features:
- every vector should point to the max slope line, with an arrow representig the flow direction
- the lenght should rapresent the slope value in degrees, and the vector line should start from the center of the square
- i want to have a vector for every 10x10m square, with an average slope value rapresented by the vector lenght
I know how to create the slope map, with 10x10m resolution... but.. how can i create the vector map with all the features i said???
How can i do this??? any suggestions???
Sorry for my english
Thanks, Luca
Email.it, the professional e-mail, gratis per te: http://www.email.it/f
Sponsor:
Analisi di Bilancio: come capire correttamente un bilancio aziendale
* Esempi, modelli pratici, software utili
Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=6199&d=21-3
Bryan Main wrote:
I'm having trouble finding out if I can input vector points in a
different coordinate system other then Lat/Long. I'm trying to use
the Irish Grid system since all of my information is already in that
format. Is this possible, or will I have to convert all of my points
from the Irish grid to lat/long?
Sure you can do it. Create a new location using the Irish Grid system
and then import with v.in.ascii.
Hamish
Luca Penasa wrote:
- every vector should point to the max slope line, with an arrow
representig the flow direction
- the lenght should rapresent the slope value in degrees, and the
vector line should start from the center of the square
- i want to have a vector for every 10x10m square, with an average
slope value rapresented by the vector lenghtI know how to create the slope map, with 10x10m resolution... but..
how can i create the vector map with all the features i said???
d.rast.arrow won't create a vector map, but it will draw your arrows.
to make vector arrows I think you will need to first use a raster
resampling module to get your 10x10 grid (if not already), then use
r.slope.aspect to get slope and aspect maps, then some r.out.xyz or
r.to.vect + unix tool magic (paste + awk & some trig) to create a vector
ascii file suitable for 'v.in.ascii format=standard'. You can copy the
needed trigonometry for the arrow head, etc., out of the d.rast.arrow
source code if needed.
Hamish