[GRASS-user] r.horizon: gives only elevations of 0 in all directions using Grass demo data

GRASS GRASS user
1

Hello,

Using Grass 6.4.4 on Windows 7 on one computer and on Windows XP on
another computer, we are only getting elevations to the horizon of
0.00000,-0.000000 at all angles. We are using the elevation models
included in the demonstration sites for North Carolina and South Dakota.
Tried many combinations of input and always receive the zeros as the
answer. In one case, I tried putting in the same input as in the manual
page for r.horizon:

r.horizon elevin=elevation direction=215 horizonstep=0 bufferzone=200
coord=638871.6,223384.4

Still produces zeros. Any ideas?

Thanks,

-Tom

2

Tom,

sorry for the late reply.

On Mon, Sep 8, 2014 at 10:37 AM, <ttessier@solaradata.com> wrote:

Hello,

Using Grass 6.4.4 on Windows 7 on one computer and on Windows XP on
another computer, we are only getting elevations to the horizon of
0.00000,-0.000000 at all angles. We are using the elevation models
included in the demonstration sites for North Carolina and South Dakota.
Tried many combinations of input and always receive the zeros as the
answer. In one case, I tried putting in the same input as in the manual
page for r.horizon:

r.horizon elevin=elevation direction=215 horizonstep=0 bufferzone=200
coord=638871.6,223384.4

Still produces zeros. Any ideas?

Are you sure that the computational region was right? I get results:

GRASS 6.4.4svn (nc_spm_08):~ > g.region rast=elevation -p
projection: 99 (Lambert Conformal Conic)
zone: 0
datum: nad83
ellipsoid: a=6378137 es=0.006694380022900787
north: 228500
south: 215000
west: 630000
east: 645000
nsres: 10
ewres: 10
rows: 1350
cols: 1500
cells: 2025000
GRASS 6.4.4svn (nc_spm_08):~ > r.horizon elevin=elevation
direction=215 horizonstep=0 bufferzone=200 coord=638871.6,223384.4
215.000000, 0.068388

GRASS 7.0.0svn (nc_spm_08_grass7):~ > g.region rast=elevation -p
projection: 99 (Lambert Conformal Conic)
zone: 0
datum: nad83
ellipsoid: a=6378137 es=0.006694380022900787
north: 228500
south: 215000
west: 630000
east: 645000
nsres: 10
ewres: 10
rows: 1350
cols: 1500
cells: 2025000
GRASS 7.0.0svn (nc_spm_08_grass7):~ > r.horizon elevin=elevation
direction=215 horizonstep=0 bufferzone=200 coord=638871.6,223384.4
azimuth,horizon_height
215.000000,0.068388

Markus