The LSM uses either the Multi-Paired Algorithm (MPA) or a Least Squares technique (Press et al., 1986) to compute the U and V horizontal wind components from the DWL line-of-sight velocities. The horizontal wind products are computed with one of three different models: High Resolution model, Grid Area Model using the MPA and Grid Area Model using the Least Squares model. Sampling and measurement errors are computed in each horizontal wind model.

High Resolution Method

The high resolution method uses the MPA to match the closest aft line-of-sight shot with the closest forward line-of-sight shot to produce a simulated horizontal U, V wind product. Each shot pair is weighted by angular separation, distance between shots and SNR.

MPA Grid-Based Method

The MPA Grid-Based Method uses the MPA to match all aft line-of-sight shots with all forward line-of-sight shots in the user defined grid area cell size to produce a simulated horizontal U, V wind product. Each shot pair is weighted by angular separation, distance between shots and  SNR.

Least-Squares Grid-Based Method

The least squares model performs a least squares fit to the lidar shots within the user’s defined grid area to produce SNR weighted U and V horizontal wind components (Press et al., 1986).

Last Updated: 02/07/2007