Hello, I am thrilled to find a number of promising modules under ‘imagery’ incorporated in the standard GRASS70 version. Specifically the “evapotranspiration calculation” modules have our special interest. Weren’t they before addons?
However I have some troubles to go through the complete calculation. The explanations on the manual pages are very (too) basic. For example, I got stuck at the “sensible heat flux calculation” that demands the “aerodynamic resistance to the heat momentum”. I supposed an average value that I found on the web and created with r.mapcalc a raster with that value. But finally I got a raster with only 0 values.
Would it be possible to create a Wiki for this evaporation module with some examples? Or could someone direct me where I can get detailed advice?
On Thu, Jun 11, 2015 at 10:01 AM, Huub Munstege <hmunstege@yahoo.com> wrote:
Dear GRASS community,
Hello, I am thrilled to find a number of promising modules under 'imagery'
incorporated in the standard GRASS70 version. Specifically the
"evapotranspiration calculation" modules have our special interest. Weren't
they before addons?
Yes, that is right.
However I have some troubles to go through the complete calculation. The
explanations on the manual pages are very (too) basic.
Agreed - we hope to find volunteers to contribute. But there is a
starter which may be helpful for you:
For example, I got
stuck at the "sensible heat flux calculation" that demands the "aerodynamic
resistance to the heat momentum". I supposed an average value that I found
on the web and created with r.mapcalc a raster with that value. But finally
I got a raster with only 0 values.
Would it be possible to create a Wiki for this evaporation module with some
examples? Or could someone direct me where I can get detailed advice?
A wiki page would be excellent. Feel free to generate it, it is a
community wiki.
Searching, I just found this stub page:
i.eb.z0m is producing an estimation of the surface roughness accordingly to the requirement, unfortunately, I did not have time to move it to the main trunk, would that be of interest?
Cheers,
Yann
On Thu, Jun 11, 2015 at 2:07 PM Markus Neteler <neteler@osgeo.org> wrote:
On Thu, Jun 11, 2015 at 10:01 AM, Huub Munstege <hmunstege@yahoo.com> wrote:
Dear GRASS community,
Hello, I am thrilled to find a number of promising modules under ‘imagery’
incorporated in the standard GRASS70 version. Specifically the
“evapotranspiration calculation” modules have our special interest. Weren’t
they before addons?
Yes, that is right.
However I have some troubles to go through the complete calculation. The
explanations on the manual pages are very (too) basic.
Agreed - we hope to find volunteers to contribute. But there is a
starter which may be helpful for you:
For example, I got
stuck at the “sensible heat flux calculation” that demands the “aerodynamic
resistance to the heat momentum”. I supposed an average value that I found
on the web and created with r.mapcalc a raster with that value. But finally
I got a raster with only 0 values.
Would it be possible to create a Wiki for this evaporation module with some
examples? Or could someone direct me where I can get detailed advice?
A wiki page would be excellent. Feel free to generate it, it is a
community wiki.
Searching, I just found this stub page:
On Fri, Jun 12, 2015 at 8:12 AM, Yann Chemin <ychemin@gmail.com> wrote:
Hi,
i.eb.z0m is producing an estimation of the surface roughness accordingly to
the requirement, unfortunately, I did not have time to move it to the main
trunk, would that be of interest?
At time I see it only as an Addon for GRASS GIS 6:
grass-addons/grass6/imagery/gipe/i.eb.z0m
It would be perfect to have it as an Addon for GRASS GIS 7 for now.
On Fri, Jun 12, 2015 at 8:54 AM, Markus Neteler <neteler@osgeo.org> wrote:
On Fri, Jun 12, 2015 at 8:12 AM, Yann Chemin <ychemin@gmail.com> wrote:
Hi,
i.eb.z0m is producing an estimation of the surface roughness accordingly to
the requirement, unfortunately, I did not have time to move it to the main
trunk, would that be of interest?
At time I see it only as an Addon for GRASS GIS 6:
grass-addons/grass6/imagery/gipe/i.eb.z0m
Sorry for the confusion (too early here to read :-), it is already there!
grass-addons/grass7/imagery/i.eb.z0m
Huub: you can install it with
g.extension i.eb.z0m
(or via the Addon extension manager in the graphical user interface)