Altering the CONTROL file for Matrix Calculation

Topics about the HYSPLIT trajectory model.
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Altering the CONTROL file for Matrix Calculation

Post by reshmarpunjabi » May 2nd, 2018, 6:14 am

I am trying to use HYSPLIT to calculate multiple forward trajectories emanating from a small region (i.e., a residential complex). However, I am unable to generate more than 2 trajectories using MATRIX: the initial conditions specified in the CONTROL file have latitude and longitude rounded to 2 decimal places. Since my source region is very small, I would like to specify the initial conditions to 3 decimal places and beyond.

I tried changing the permission of the CONTROL file to read-only, but the file is overwritten and regenerated (with only 2 decimal places) every time the MATRIX program is run.

I would like to modify the CONTROL file or source code to allow for additional decimal places. Is this possible? Any advice would be greatly appreciated.

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Re: Altering the CONTROL file for Matrix Calculation

Post by barbara.stunder » May 7th, 2018, 11:02 am

There is information about the Matrix in the Tutorial section 12.5 at ... _recp.html

Do a regular (non-matrix) run with the source latitude/longitude using 3 or more digits. Then add the 2nd and 3rd latitude/longitude locations for the matrix run.

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