Photogrammetry is a method used to obtain accurate and reliable data for mapping purposes. It combines multiple images captured by aerial photography to create a map an area of interest (AOI). This is known as stereo or mosaic photogrammetry. Topographic mapping with the use of photogrammetry is when two digital aerial photographs of a location are captured from different angles. These aerial images are then analyzed to create maps for various projects.
Photogrammetry Use for Mapping Solutions
There are three tools which are used for photogrammetry mapping projects. The tools are a sophisticated high-resolution camera with three or more bands, a measuring device to highlight professionally surveyed reference points, and a computer that runs software to analyze images captured through aerial photography. The camera captures images of the location from two different angles. In addition, the wide-angled camera lens captures images based on coordinates for the project.
To have variations, it is essential to capture aerial images from different elevated angles. During the process of capturing the aerial image, the analyst ensures the angle of sunrays are appropriate while determining the right color balance of the image.
Mapping is completed by analyzing the 2D photographs captured by the camera. The final image is created to feature precise details about the location based on measurements collected from the aerial photographs.
During mapping with photogrammetry tools, the focus is on the geographic features of the site.
Analyzing 2D Images
There is special software for photogrammetry, which is used to analyze the 2D images captured by the camera. The software uses innovative programs to develop the final high-definition aerial photographs. Depending on the project needs, 2D images can also be captured from ground level.
Mapping is done by a technical procedure called triangulation. First, two aerial images captured by the digital camera are analyzed to determine the pixels which are matched by software. The matching is done to identify points that appear on both aerial images for accuracy.
Next, the surface creation process is also done with the photogrammetry software. It is an automated process before triangulation. Triangulation and matching points help eliminate positional errors on digital 2D images while developing detailed aerial image of the site.
Benefits of Using Photogrammetry for Mapping
Photogrammetry methods have evolved to become excellent mapping solutions since topographic mapping needs have increased. There are so many benefits which have been identified, making the aerial photography method very popular.
Some of the significant benefits of using photogrammetry for mapping include;
Aerial images obtained from a high altitude with the photogrammetric tools are reliable and highly accurate. Which is why Leading Edge Geomatics frequently uses it for clients in industries such as forestry, utility, agriculture, and mining.
Photogrammetry can quickly and efficiently collect data of wide-areas. It is a cost-effective method as it does not require long hours of extensive ground surveying.
By performing aerial photogrammetry mapping, Leading Edge Geomatics avoids putting its employees at risk when dangerous terrains need to be collected and analyzed. Aerial photogrammetry mapping also removes the risk losing expensive equipment in difficult landscapes like natural disaster sites.
Leading Edge Geomatics guarantees delivering accurate and efficient mapping solutions to all our clients across North America. To date we have completed over hundreds of photogrammetry projects to assist clients with flood mapping, forestry management, vegetation management, and so much more. Take advantage of our experience and industry leading tools and technology to get the perfect 3D rendering for any AOI in North America.
To find the right mapping solution for your project needs, contact us today to speak with our team.