West Virginia Division of Highways - I-70 Aerial LiDAR

GRW recently completed aerial LiDAR and Mobile Terrestrial LiDAR Scanning projects for the West Virginia Division of Highways. The aerial LiDAR project involved a 14.1 mile stretch of I-70, located in the northern panhandle of West Virginia.

Field surveys accomplished by GRW included 63 control points for accurate measurements during the aerial triangulation and LiDAR calibration phases of the project. Project tasks included the installation of permanent monuments according to WVDOH specifications.

GRW utilized Airborne GPS and IMU technology during aerial photography and LiDAR data collection. LiDAR data was collected with a state-of-the-art scanner mounted in a fixed wing aircraft. GRW's LiDAR specialists performed LiDAR editing utilizing TerraSolid and GeoCue software. Initially, each tile was run through a macro designed to remove as much vegetation as possible. Following macro processing, each tile was manually edited to generate accurate final masspoints. The end result of the LiDAR processing stage was a fully classified point cloud capable of supporting 1’ contour generation for the full 600’ corridor.

For aerial photography collection, GRW used our UltraCam LP digital mapping camera system.  Orthoimagery was generated with a 3” pixel resolution covering the full project areas, and was delivered in TIFF format as color images.

GRW applied the LiDAR DTM and aerial photography for the generation of 1’ contours. LiDAR DTM was supplemented with breaklines denoting major breaks in the terrain. Contours were supplemented with spot elevations where necessary, including saddles, tops, depressions, and road intersections.

Under separate task orders, GRW has accomplished numerous mapping and survey projects for WvDOH.  These projects included the use of aerial photography and LiDAR, Terrestrial Laser Scanning (both mobile and stationery), and conventional field surveys.