Lidar Products and Services.
USGS Compliant Lidar Products and Services
Aerial lidar (light detection and ranging) is a mapping technology which uses reflected laser returns from the earth’s surface to an aircraft with on-board laser scanner, GNSS/IMU sensors to determine the precise elevation and geospatial location of the terrain, vegetation, and other features. With the latest sensor technology, lidar offers an accurate and cost-effective method for creating three-dimensional topographical aerial maps and highly accurate surveys of both surface terrain elements and man-made structures.
Aerial lidar is used in a variety of industries, including geography, forestry, oceanography, and emergency management. Sanborn delivers lidar data that complies with USGS Lidar Base Specification. Options are available for varying quality levels, including USGS QL3, QL2, QL1 and QLO as well as higher densities as needed including 100+ points per square meter. In addition, Sanborn lidar data can be further enhanced with breaklines to create hydro-flattened, enforced, and/or conditioned Digital Terrain Models (DTMs).
Sanborn lidar systems are calibrated and accuracy is verified before commencing any project. Accuracies greater than 5cm RMSEz are possible.
Lidar Applications Include:
- 3D modeling
- Floodplain mapping and planning
- Disaster management
- Coastal erosion and nautical charting
- Airport mapping / aviation safety
- Forestry
- Land use mapping and planning
- Volumetric studies
- Utilities / transmission line corridor mapping
Lidar Deliverables Include:
- USGS Lidar Base Specification Options available for varying quality levels including QL3, QL2, QL1 and QL0.
- Classified point cloud
- Bare-earth DEM, and hydro-flattened breaklines.
- Metadata and reports
Advantages of lidar data collection systems compared to aerial imagery / photogrammetry include:
- Rapid collection of 3D elevation data
- High density point cloud
- High accuracy elevation data points
- Less weather-dependent flight operations than aerial imagery
- Direct generation of Digital Surface Model elevation data
Standard products from lidar include:
Digital Elevation Model
Digital Surface Model
Intensity Imagery
Canopy Height Model
Contours
Building Wireframe
RGB Point Clouds
Sanborn Lidar Case Study
Cresting water at the AmerenUE’s Taum Sauk Upper Storage Facility caused a massive dam failure resulting in more than a billion gallons of water rushing down Proffit Mountain and overwhelming the east fork of the Black River and the lower ground of Johnson’s Shut-Ins State Park. The water swept the park superintendent’s home, along with his family, a quarter-mile away and caused damage to several vehicles that were brushed off a local highway into an adjacent field. According to calculations, the flow of water at the time would have been nearly 150,000 cubic feet per second, which is nearly equivalent to the rate water travels over Niagara Falls.
Draped orthoimagery showing failed Taum Sauk Reservoir and surrounding affected area.
Orthoimagery of failed Taum Sauk Reservoir
Lidar imagery of failed Taum Sauk Reservoir
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