# How to visualize WRF-Fire output in Matlab

*Back to the WRF-SFIRE user guide*.

## Contents

## Prerequistes

- A visualization computer with recent Matlab and memory at least 3 times the size of the
**wrfout**file. - A working installation of WRF-Fire, possibly on another computer or a cluster.

## Loading WRF-Fire files into Matlab

*Note that fire variables in WRF files have an extra strip the size of subgrid ratio at the end every spatial dimension. That is, each spatial dimension stored in WRF files is by the subgrid ratio larger. The functions provided here will hide that and manipulate the fire variables correctly.*

- It is recommended to set in Change in
**namelist.input**the variable**frames_per_outfile**small, esp. for a large model, to avoid creating huge files. - Run WRF-Fire.
- If the visualization computer is different from the computer where you run WRF-Fire,
- Download WRF-Fire on the visualization computer
- Transfer the
**wrfout**file to the visualization computer

- Start Matlab on the visualization computer from the directory
**wrf-fire/WRFV3/test/em_fire**. This is needed to set Matlab search path. Alternatively,**cd**in Matlab to this directory and run**startup**. You can then**cd**to the directory where you put the**wrfout**file. You can also**cd**to**wrf-fire/other/Matlab**and run**startup**there. - Use commands
**ncload**to load all variables from a WRF file into matlab workspace,**ncread**to read a single variable into a matrix,**nc2struct**to read multiple variables as fields of a structure, and**ncreplace**to rewrite the value of a variable in the file.

## 3D Visualization

- Proceed as above, except change in
**namelist.input**the line with**history_interval**to the desired frame interval in seconds, for example**history_interval_s=1**make sure**frames_per_outfile**is large enough so that only one**wrfout**file is produced. - Type in Matlab
**wrfout2frame3d** - Examine the variables loaded in the Matlab workspace for further education and entertainment.

The scripts are fairly straightforward and various options are controlled by editing the scripts in Matlab.

## See also

## Gallery

## Works with

- WRF-Fire Aug 7 2010 and hopefully later
- Matlab 2008b and later
- Tested with Matlab 2010a on MacBook Pro 4GB OS X 10.6