Aerial Imagery and Terrain Modeling
FAA Approved Unmanned Aircraft Technology
Here is a more detailed view of the contour lines around the ditch area. Units are feet above sea level.
In this image we can see the elevation model depicted as a topgraphic map with 2-foot contour lines. Units are feet above sea level.
These images compare the DSM elevation model detail to the mosaic imagery. Accurate modeling is derived from the imagery through advanced processing and other proprietary techniques. High Resolution imagery results in exceptionally detailed elevation modeling when using these techniques. Click on the images below for more examples of the terrain modeling and imagery.
The same run down the slope reveals an elevation drop of 19.4 meters.
This is the 2-D photo-mosaic of the ditch area used to create 3-D models. The detail photo reveals actual photographic resolution (3.0cm) across the mosaic. (Displayed detail will vary depending on screen resolution and graphics capabilities of your computer)
Rotating the DSM in 3-D allows us to view the terrain from any angle and make measurements in 3 dimensions. In this example we are measuring a 774 meter run down the slope to the ditch. We can see that the slope measures -1.44 degrees
This is a Digital Surface Model (DSM) of a Ditch34 segment. The shading indicates relative height across the DSM with red being highest and blue being the lowest. The DSM is oriented North-up in this depiction. You can see that the terrain generally slopes toward the ditch from East to West.
In this test, the GeoStar UAV collected a 0.5sm x 0.5sm area (160 acres) from an altitude of 550ft AGL achieving a Ground Sample Distance (GSD) of approximately 3.0cm per pixel. County Ditch 34 ran through the eastern portion of the collection area. AeroLogix performed a dedicated processing run of the ditch areas and created a standard Digital Surface Model (DSM) along with a 3-D point cloud models in the .LAS format, averaging nearly 200 points per square meter. In 3-D GIS viewing software, features of the ditch can be measured to estimate it's capacity and effectiveness along with the surrounding terrain slope.
See the results below!
AGRICULTURAL DITCH MODELING - Le Sueur County, MN
Modeling can also be converted to GIS shapefiles and displayed in a variety of ways. See the images below for examples of AeroLogix high resolution imagery converted to vector files.
In this example, the ditch depth is measured relative to the higher terrain immediately adjacent.
Finally, the imagery and modeling can be combined into a 3-D model that carries the coloring of the imagery and 3-D rendered elevation data. The images below are of the same ditch area in a .LAS format,