2003 Marion County LiDAR dataset
The Indianapolis Mapping and Geographic Infrastructure System has provided the Marion County 2003 LiDAR files. The archive includes 143 GB of point data in 316 text files and a 25-foot bare-earth DEM in shapefile format (divided into 49 N-S strips each about 25 MB)
The IMAGIS contractor did not adjust the point coordinates in *.FIR (first return) and *.LST (last return) files to ground control. IMAGIS staff review of the full point cloud shows that the horizontal location is between 1-15 feet from true, and vertical is 1-2 feet below true ground. Relative to each other, the points are very accurate, and can be used for draping 3D photos, creating fly-through animations, studying tree cover, and sub-canopy ground cover. The unadjusted values are sufficient for most building height applications, shadow studies, and line of sight.
Files beginning with CITY* are data for the 45 degrees offset from the east-west flight lines.File Format
Coordinate System: IN State Plane East, Zone 1301 Horizontal Datum: NAD83
Elevation units:: International Survey Feet
Example point data