Great Sand Dunes National Park and Preserve LiDAR Datasets

Light Detection and Ranging (LiDAR) datasets for Great Sand Dunes National Park and Preserve Data is not attached to this reference. Contact IMR GIS for data, imrgis@nps.gov. LiDAR data over Great Sand Dunes National Park and Preserve including DEM, intensity, and LAS datasets. These data were collected as part of a larger project for the USGS that collected LiDAR for all of the San Luis Valley in Colorado. The San Luis Valley LiDAR Acquisition project is to provide high accuracy bare-earth processed LiDAR data suitable for the project area. The project consisted of acquisition, post-processing, classification of LiDAR data, and creation of final deliverable products. All areas were collected at a nominal pulse spacing (NPS) of 1.0 meters based on UTM13, related to the North American Datum of 1983 (NSRS2007). Vertical accuracy was to achieve a RMSE Z of 12.5 cm (95% confidence level of less than 24.5 cm) or better in the "Open Terrain" land cover category for all areas. Accuracy statement is based on areas of moderate to flat terrain. Diminished accuracies are to be expected in areas in dense vegetation. The accuracy of the LiDAR data as tested met or exceeded the vertical accuracy requirements; however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in such areas.