Montana LiDAR
This layer represents the grids for available LiDAR data from the State of Montana. There is only one project area: Flathead Basin. Users will have access to this layer in the side pane when a Location of Interest (LOI) is placed near available records. When the user selects a tile, the pop-up bubble will show tile and project name and provide links for All Returns plus Ground Returns zip files and metadata.
Ground Return Data
These data files are the "ground return" LiDAR point cloud data collected in the Flathead Basin, Montana, between September 22 and September 29, 2009. The study area includes the Flathead Valley floor, the area around Polson, and the shorelines of Flathead Lake, Whitefish Lake, and Swan Lake. This data only includes points that were identified as being on the ground surface - all structures and vegetation have been removed.
The horizontal coordinate system of the data is Montana State Plane Coordinates, NAD83 HARN, and the units are U.S. Survey Feet. The vertical Datum is NAVD88 (Geoid03).
Logical consistency report:
LiDAR flight lines have been examined to ensure that there was at least 50% sidelap, there are no gaps between flightlines, and overlapping flightlines have consistent elevation values.
Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting. The data was examined at a 1:2000 scale.
Vertical positional accuracy value:
RMSE = 0.118 feet (0.036 meters)
Vertical positional accuracy explanation:
The Root Mean Square Error (RMSE) of the data set is 0.118 feet (0.036 meters). Accuracy was assessed using 4229 ground survey (real time kinematic) points. Please see LiDAR data report for a discussion of statistics related to these datasets..
All Return Data
These data files are the "all return" (including structures and vegetation) LiDAR point cloud data collected in the Flathead Basin, Montana, between September 22 and September 29, 2009. The study area includes the Flathead Valley floor, the area around Polson, and the shorelines of Flathead Lake, Whitefish Lake, and Swan Lake. The points are classified as 1 (Default) or 2 (Ground).
The horizontal coordinate system of the data is Montana State Plane Coordinates, NAD83 HARN, and the units are U.S. Survey Feet. The vertical Datum is NAVD88 (Geoid03).
Logical consistency report:
LiDAR flight lines have been examined to ensure that there was at least 50% sidelap, there are no gaps between flightlines, and overlapping flightlines have consistent elevation values.
Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting. The data was examined at a 1:2000 scale.
Vertical positional accuracy value:
RMSE = 0.118 feet (0.036 meters)
Vertical positional accuracy explanation:
The Root Mean Square Error (RMSE) of the data set is 0.118 feet (0.036 meters). Accuracy was assessed using 4229 ground survey (real time kinematic) points. Please see LiDAR data report for a discussion of statistics related to these datasets.