UAV Survey-Grade Topographic Mapping – Part 2
We are making available the complete drawing file for the Black Cloud site that was originally posted on September 12, 2016, which now includes a high-resolution orthomosaic image. The orthomosaic image adds a whole new level of detail to the project site, and is an extremely valuable engineering design tool.
We hope that you will DOWNLOAD the new .zip file, which contains the georeferenced orthomosaic image and contour mapping, so you can see firsthand, the impressive capability of this technology.
Once the files are extracted from the .zip file into a new folder, open the AutoCAD drawing file from within the new folder, and the 1-foot contours should be overlaid on the aerial image. If you cannot see the contours, then you may have to select the image boundary, right click, and select Display Order> Send to Back, so the image is behind the contours.
To further illustrate the accuracy of the point cloud generated from UAV aerial data collections, we have taken a snapshot of one of the ground control points used on the Black Cloud project. The image below was taken from the Digital Elevation Model (DEM) and clearly identifies Ground Control Point 1, which is a 10″ diameter frisbee, identical to the one shown in the second image below.
We are currently using UAV topographic mapping and aerial imagery for civil engineering design, which includes a 3-mile section of roadway in the City of Fort Lupton.
We have found the high-resolution aerial imagery to be a valuable design reference, which can be used for identifying utilities, utility locates, and ground features. The image below shows blue paint marks representing a water line locate, which was done for an unrelated project.