[GRASS-user] Retrieving Vector Point Screen Coordinates

Glynn Clements glynn at gclements.plus.com
Fri Aug 22 19:31:30 EDT 2008

Robert Shedd wrote:

> >> I am currently working on a project that it would be helpful to be able 
> >> to retrieve the x-y coordinates of a set of vector points.  I am 
> >> generating the map display in a script so interactive features (such as 
> >> available with d.where) will not work.
> >>
> >> My current basic script is essentially the following:
> >>
> >> export GRASS_WIDTH=800
> >> export GRASS_HEIGHT=600
> >> d.mon start=PNG
> >> d.vect  map="pointvector" type="point" icon="basic/box" size=10 lcolor="black" fcolor="green"
> >> d.mon stop=PNG
> >>
> >> I am looking to find where each of the points in pointvector plots within the 800x600 png file.
> >
> > Something like "v.report YOURMAP option=coor"? Maybe I do not understand
> > the problem exactly.
> That is close to what I need, but v.report YOURMAP option=coor reports 
> the coordinates in lat-long coordinates.  I am trying to find the x-y 
> location where those lat-long coordinates actually plot on the output 
> image relative to the top left or bottom left corner of the graphic.

One option is to parse the output from the HTMLMAP driver.

Glynn Clements <glynn at gclements.plus.com>

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