EarthData International collected ALS-50-derived LiDAR over Upper Myakka Florida with a one-meter post spacing. The
period of collection was between 3 October and 12 October 2006. This data set falls in Manatee County. The collection was
performed by EarthData Aviation, using a Leica ALS-50 LiDAR system, including an inertial measuring unit (IMU) and a dual
frequency GPS receiver. This project required six lifts of flight lines to be collected. The product generated consisted of
LiDAR bare earth elevation models in LAS format. This data set is one component of a digital terrain model (DTM) for the
Southwest Florida Water Management District's FY2005 Digital LiDAR Project (H048), encompassing approximately 291 square
miles across Manatee County. The 2005 LiDAR dataset is comprised of 3-D mass points delivered in the LAS file format based
on the District's 5,000' by 5,000' grid (325 cells). The other DTM component is 2-D and 3-D breakline features in the ESRI
ArcGIS Personal Geodatabase format. In accordance with the 2005 SWFWMD Topographic Database Design, the following breakline
closed water bodies (lakes, reservoirs, etc) as 3-D polygons; linear hydrographic features (streams, canals, swales,
embankments, etc) as 3-D breaklines; coastal shorelines as 3-D linear features; edge of pavement road features as 3-D
breaklines; soft features (ridges, valleys, etc.) as 3-D breaklines; obscured vegetation polygons as 2-D polygons; overpasses
and bridges as 3-D breaklines; 1-foot contours for visualization purposes; and island features as 3-D polygons. Breakline
features were captured to develop a hydrologically correct DTM. Contours (1-foot) were generated from the DTM that meet the
National Map Accuracy Standards for 2-foot contours (FEMA specifications). Bare earth LiDAR mass point data display a vertical
accuracy of at least 0.3-feet root mean square error (RMSE) in open unobscured areas.
Original contact information:
Contact Name: Mapping and GIS section
Contact Org: Southwest Florida Water Management District
Phone: 352.796.7211
This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.