[GRASS-user] assign heigght value to pixel(x,y)

[vinod kumar]

Hi Markus Netler,

i want to identify buildings, trees etc.. and assign height values at
particular zoom level in a raster map and to view the data in a 3Dimensional
where i do not have any information to identify pixel graphically.

And the problem also persists in identifying buildings and assigning height
values and to use condition like IF might not be possible as there is no
source of information.

Thanks in advance,
nani.



On Sat, Apr 16, 2011 at 11:06 PM, Markus Neteler <neteler at osgeo.org> wrote:

> On Sat, Apr 16, 2011 at 10:36 PM, vinod kumar <nani.kunithi at gmail.com>
> wrote:
> > Hi Markus Neteler,
> >
> > yes, importing pixel values with r.in ascii and patch into existing into
> > raster is simple easy for particular pixel,
> > but if we want to assign a height value to more pixels, for example
> > assigning height value to buildings in a
> > particular area in raster map is difficult as we don't no to which pixel
> > value we have to assign height value and
> > checking each pixel value is difficult.
>
> Now I understand a bit more: so use r.mapcalc with an if() condition.
>
> Markus
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20110417/897c10ef/attachment.html