Hi all,
Does anyone know how to control the aspect ratio of a region? That is, you can set the height and width, but what if you want to make the region, say, 3:4 so that it fits perfectly in an 800 x 600 window? I find that I make a lot of screenshots for presentations and this works out best if you can create a region that is 3:4. Some of you are probably thinking, just to the math, but this can be tricky for lat-lon locations. Also, say you manage to create a 3:4 region. What then if you want to double the size, or half the size of the region, but want to maintain the aspect ratio. Can't be done with the mouse. More tricky math.
As always, thanks for your thoughts.
I need to estimate the areas of a set of lagoons for differente water height scenarios.
I am using the SRTM 30 DEM and I was hoping to apply r.fill.dir, to get the water height.
The documentation for r.fill.in stgates that “The procedure takes an elevation layer as input and initially fills all the depressions with one pass across the layer”.
Unfortunately, there is no specification as to how tis is done. I have searched for the paper describign the algortihm on whihc r.fill.in is based “Software Tools to Extract Structure from Digital Elevation Data for Geographic Information System Analysis” by S.K. Jenson and J.O. Domingue (1988). but I have been unable to find it in the internet.
I need to ask two questions:
- is there any other method you would reccomend in addition to r.fill.dir to compute water height/areas ratio for depressions using a DEM?
- Anybody has a copy of the above cited paper or a detailed description of the algortuhm?
Cheers thanks
Armando Scalise
il.com