[GRASSLIST:10025] which is the best method to calculate the distance between two points?

GRASS GRASS user
1

dear grass list,

i have two points, they do not belong to a vector map, i have found that i
can obtain the distance (in UTM and LAT/LONG locations) with this (ugly)
trick

grass$ r.profile map=rmap profile=x1,y1,x2,y2 2> temp_file
grass$ distance=$(awk ‘/length/{print $4}’ < temp_file)

this method needs a query to a raster map, which is unnecessary, is
something like d.measure available in r.* commands?

Thanks in advance

–
Patricio Toledo

2

On 1/27/06, Patricio Antonio Toledo Peña <patricioantoniotoledo@gmail.com> wrote:

dear grass list,

i have two points, they do not belong to a vector map, i have found that i
can obtain the distance (in UTM and LAT/LONG locations) with this (ugly)
trick

grass$ r.profile map=rmap profile=x1,y1,x2,y2 2> temp_file
grass$ distance=$(awk ‘/length/{print $4}’ < temp_file)

this method needs a query to a raster map, which is unnecessary, is
something like d.measure available in r.* commands?

Thanks in advance

–
Patricio Toledo

Try d.geodesic.

d.geodesic - Displays a geodesic line, tracing the shortest distance between two geographic points along a great circle, in a longitude/latitude data set. (from the grass 6 manual)

–
Odoardo Zecca

3

Try d.geodesic.d.geodesic - Displays a geodesic line, tracing the
shortest distance between two geographic points along a great circle,
in a longitude/latitude data set. (from the grass 6 manual)--Odoardo Zecca

d.geodesic does not work on UTM locations and the result is on screen, i need it
on a variable to make some calculations.

still trying
Thanks,