R.sun: Difference between revisions

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=== Time step ===
=== Time step ===


The following three images demonstrate the effects of using different ''step'' parameters.
The following three images demonstrate the effects of using different time '''step''' parameters.


r.sun -s elevin="gauss" glob_rad="rad.global.30minT" day=180
[[File:Gauss_30min.png|400px|thumb|center|Default 30 minute time step over a Gaussian mound.]]


r.sun -s elevin="gauss" glob_rad="rad.global.30minT" day=180


  r.sun -s elevin="gauss" glob_rad="rad.global.15minT" day=180
  r.sun -s elevin="gauss" glob_rad="rad.global.15minT" day=180
[[File:Gauss_15min.png|400px|thumb|center|15 minute time step over a Gaussian mound.]]


  r.sun -s elevin="gauss" glob_rad="rad.global.03minT" day=180
  r.sun -s elevin="gauss" glob_rad="rad.global.03minT" day=180


[[File:Gauss_03min.png|400px|thumb|center|3 minute time step over a Gaussian mound.]]


Default 30 minute time step.
15 minute time step.


3 minute time step.




The 3 minute time step takes roughly ten times as long to run as the 30 minute timestep.
The 3 minute time step takes roughly ten times as long to run as the 30 minute timestep.

Revision as of 09:54, 19 May 2009

r.sun

Help page

Tips

Testing

Create an artificial surface containing a Gaussian mound:

r.surf.volcano out=gauss method=gaussian kurtosis=1

Time step

The following three images demonstrate the effects of using different time step parameters.

r.sun -s elevin="gauss" glob_rad="rad.global.30minT" day=180
Default 30 minute time step over a Gaussian mound.


r.sun -s elevin="gauss" glob_rad="rad.global.15minT" day=180
15 minute time step over a Gaussian mound.


r.sun -s elevin="gauss" glob_rad="rad.global.03minT" day=180
3 minute time step over a Gaussian mound.



The 3 minute time step takes roughly ten times as long to run as the 30 minute timestep.