[GRASS-user] calculate height above ground for a specific vertical angle of view

GRASS GRASS user
1

Hello,

I have calculated viewshed maps from one point of view at 2m height increasing the altitude above topography from 0 to 250m. So with r.series i can calculate the total visible height (sum of True in meter) or the total invisible height(sum of false in meter), or the vertical visible angle (angle-mode).

I want now calculate the visible height (in metres) according to a specific vertical angle of view from my point of view.

Witch method I could use to get effectively that result ?

Thanks !

2

Le 21/06/2017 à 12:44, Frank David a écrit :

Hello,

I have calculated viewshed maps from one point of view at 2m height
increasing the altitude above topography from 0 to 250m. So with
r.series i can calculate the total visible height (sum of True in meter)
or the total invisible height(sum of false in meter), or the vertical
visible angle (angle-mode).

I want now calculate the visible height (in metres) according to a
specific vertical angle of view from my point of view.

Witch method I could use to get effectively that result ?

Thanks !
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

I think I have found the way to do it, if I find the trick to count the number of raster where values are inside a range limit (-inf,myTarget). Because I have one raster of vertical angle by meter.
I've tried r.series with range but I'have not found the way to count the raster number processed in the range limit
Is anyone have an idea ?
Thanks for your help

3

On 23/06/17 08:51, frank wrote:

Le 21/06/2017 à 12:44, Frank David a écrit :

Hello,

I have calculated viewshed maps from one point of view at 2m height
increasing the altitude above topography from 0 to 250m. So with
r.series i can calculate the total visible height (sum of True in meter)
or the total invisible height(sum of false in meter), or the vertical
visible angle (angle-mode).

I want now calculate the visible height (in metres) according to a
specific vertical angle of view from my point of view.

Witch method I could use to get effectively that result ?

Thanks !
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

I think I have found the way to do it, if I find the trick to count the
number of raster where values are inside a range limit (-inf,myTarget).
Because I have one raster of vertical angle by meter.
I've tried r.series with range but I'have not found the way to count the
raster number processed in the range limit
Is anyone have an idea ?

r.series [...] method=count range=-inf,myTarget ?

Moritz