The Community Doppler Lidar Simulation Model (DLSM)

Horizontal DWL Line of Sight Graphics

There are three horizontal DWL Line of Sight graphic options available: Line of Sight Winds, Target Sample Volume Errors and Observation Uncertainties. All variables are displayed as a function of  latitude and longitude. 

After the LOS variable is chosen, a pop-up child window will provide the following user customization options: 

  1. Project the LOS variable into a horizontal plane (default) or view the LOS variables along the line of sight

  2. View LOS variables with clouds in the simulation (default) or with no clouds in the simulation.

  3. View all LOS variables in an user defined atmospheric layer. The layer is a geometric thickness (currently the DLSM uses either the user's above or below PBL vertical bin) centered around an user chosen atmospheric level. The user should use caution when choosing an atmospheric level between 0.5 to 3 km due to the geometric thickness will vary depending upon the PBL height. 

  4. View LOS variables that either are considered good (i.e.. passed user defined thresholds) , are only false alarms or both.

  5. View LOS variables graphed on top of a previously plotted atmospheric variable. The user is strongly cautioned with this option. There is no model checking to insure that the DWL LOS products match up with the atmosphere file chosen. In addition, the atmosphere files are for a specific single time where the LOS products are interpolated in time. No atmosphere background is default.

The following example shows horizontal projected "good" surface DWL LOS winds with cloud effects considered. The default binning range on the LOS winds ranges from -10 to 10 m/s. The default binning range on the LOS Target Sample Volume Errors and Observation Uncertainties ranges from 0 to 5 m/s. 

The user can change the LOS variable binning from the Options menu using the Set Range for the Current Variable option.

To re-generate the plot with the new binning ranges, the user must click the Re-Plot button.

From the Level (km) field, the user can choose a new atmospheric level without going back to the LOS Analysis Menu. To re-generate the plot with the new level information (10 km in the example), the user must click the Re-Plot button.

 

© Copyright 1995-2005, Simpson Weather Associates, Inc.

Last Updated: 02/07/2007