URS Corporation contracted EarthData International to aquire topographic elevation data for 82 square miles in Essex
and Middlesex Counties, Massachusetts during 2006. Products generated include lidar point clouds, 3D hydro breaklines,
and lidar bare-earth elevation models in LAS format using lidar collected with a Leica ALS-50 Aerial Lidar Sensor.
Lidar Sensor Specifications:
Sensor: Leica ALS-50 Aerial Lidar Sensor (s/n ALS036)
Airspeed: ~ 130 knots
Laser Pulse Rate: 38,000 Hz
Field of View: 35 Degrees
Scan Rate: 20 Hz
Average Swath Width: 1537 meters
Nominal Post Spacing 3 meters
This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.