## How to calculate area of lake for model?

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arl.noaa
Posts: 33
Joined: November 9th, 2012, 2:49 pm
Registered HYSPLIT User: No

### How to calculate area of lake for model?

Hello
I want to define a lake which is going to be dried as a source. My question is how to determine the exact area of lake in HYSPLIT.

glenn.rolph
Posts: 362
Joined: November 7th, 2012, 1:39 pm
Registered HYSPLIT User: Yes
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### Re: How to calculate area of lake for model?

You define the lake area with a series of latitude longitude source positions in the CONTROL file. The number of points you use determine the spatial resolution of your simulation. For instance at 0.25 deg resolution, the CONTROL file would consist of a series of points:

38.50 -114.00 10.0 -1.0 6.0E+08
38.50 -113.75 10.0 -1.0 6.0E+08
38.50 -113.25 10.0 -1.0 6.0E+08
38.50 -113.00 10.0 -1.0 6.0E+08
38.75 -114.00 10.0 -1.0 6.0E+08
38.75 -113.75 10.0 -1.0 6.0E+08
38.75 -113.50 10.0 -1.0 6.0E+08
38.75 -113.00 10.0 -1.0 6.0E+08
39.00 -114.00 10.0 -1.0 6.0E+08
39.00 -113.75 10.0 -1.0 6.0E+08

defining the lake, and where 6E+08 represents the area of that point in m2.