Aerial Survey, Ontario
We provide a variety of geographically referenced maps and aerial surveying services in Ontario, including Ortho Mosaics and Digital Elevation Models.
Geo Mapping, Aerial Surveying & Orthomosaics
Aerial 2D & 3D Orthomosaic Imaging, GIS Services and Geo Referenced DEM/DSM Models
High Eye Aerial Imaging provides a variety of geo mapping and aerial surveying services in Ontario, including geo-referenced Orthomosaics and Digital Elevation Models. We offer an innovative service that captures high-definition aerial images, which can then be uploaded and processed through a web-based interface. When using Ground Control Points (GCP), we can achieve sub-meter absolute accuracy.
What We Offer
High Eye Aerial Imaging offers accurate geospatial mapping solutions generated from 2D aerial imagery in Ontario. We can provide high-resolution Digital Elevation Models (DEM), Digital Surface Models (DSM), Orthomosaic images and Point Cloud creation from a fixed wing or multi rotor UAV platforms. Virtual Surveyor is High Eye Aerial Imaging’s solution to handle large volumes of data that come with UAV True Orthophotos and elevation models by bringing them together in a virtual environment:
- Fast visualization
- Drawing break lines and reference points in a 3D environment
- Perform volume analysis
- Real-time calculation of elevation contour lines, slopes and slope directions
- Direct export to CAD
UAV-based photogrammetric surveys do not directly produce vectored features. Instead, the process begins with the acquisition of aerial images in raster format. These images, which are the equivalent of raw survey measurements in conventional surveying, cover the terrain at more or less homogeneous density (irrespective of the nature of the terrain). The total volume of raw data per unit of terrain surface area thus depends on the resolution of the imagery. The method of assessing accuracy is based on a point by point analysis. A comparison of the green and red lines in Figure 7 below illustrates this concept. The red line represents a typical profile as would be generated by surveying in the real world a distinct number of terrain points. The green line represents a profile generated in Virtual Surveyor, which fully exploits the terrain point density in the virtual model. You will notice that the green line much more closely represents the shape of the actual profile than the red line. This ability in virtual surveying to force profile lines (or areas, for that matter) to “hug” the terrain at specified terrain point density outweighs the disadvantages caused by the random errors in the terrain point positions defining a photogrammetrically generated terrain model. Once features have been captured, they can be exported in popular CAD and GIS formats, such as dxf or shape files.
Virtual Surveyor allows you to use all points in a UAV elevation model to perform a volume calculation. You delineate the area of which you want to determine the volume, and the software performs an accurate calculation in a fast way. You can also calculate volume differences, incorporating all the data points available if you have UAV elevation models acquired at different times available.
Applications & Benefits
- Build a virtual model of your quarry using an unmanned aerial system
- Create a complete aerial survey plan with Virtual Surveyor software
- Measure volumes and volume differences in a few mouse clicks
- Identify break lines and slopes in the virtual environment
- Use a UAV True Orthophoto as a base map of your quarry
- ‘Access’ dangerous and unstable places in a safe way by using Virtual Surveyor software
Virtual surveying in Ontario is not applicable to the entire spectrum of survey jobs but has a clear number of benefits when applied to the appropriate project. It implies significant cost savings, as one can measure considerable more points and lines in the same time window. Moreover, in the virtual world, transportation logistics are no hindrance, and the weather can be controlled at will by adjusting the climate controls in the office. It is also the safest way to acquire data in dangerous environments, such as mine pits, along unstable slopes or in vehicle traffic. And in case an item was overlooked, the virtual world can always be called up again to complete or correct the survey.
Accuracy of Aerial Survey Data
The accuracy of aerial survey data is determined by the Ground Sample Distance (GSD). This is the area of ground captured in a single pixel of a digital image. This measurement varies depending on the camera resolution and flight altitude. The expected accuracy when using Ground Control Points (GCP’s) is: GSDx1 horizontally and GSDx2 vertically.
With our 24mpx camera, flying at an altitude of 150 metres, we obtain a GSD of less than 4 cm. For smaller areas, we use our multi rotor at 60 metres, which produces a GSD of less than 2 cm.