This pattern is typical for the coverage of every point in the survey Area of Interest and makes the difference between a good 3D model and a stunning 3D model! This pattern of photo positions is ideal for 3D city model construction because it means that the church has been viewed a very large number of times (over 100) from every possible direction and inclination. The green dots show the position of the camera relative to the church and the concentric circles indicate the ‘obliqueness’ of the photo (the nearest ring is 15 deg from vertical, the next ring is 30 degrees from vertical and the third ring is 60 degrees from vertical). This survey would have included three lines of circles tracking North to South. The diagram below shows the photo coverage achieved by a typical Circular Trajectory as seen from a point on the ground at the centre of the diagram (say a church). That’s six times more information than a conventional high cost oblique camera system (naming no names!). The XCAM takes approximately 48 images as it flies around each circle. We’ve seen this demand from the planning, asset management, smart cities and 5G development market sectors, among others.īelow is an animation of the camera footprint taking into account both XCAM sensors. So the data captured can be used for delivering traditional orthophoto and DEM products, as well as photo-realistic 3D mesh models that the market is beginning to demand. Yes, true-orthos from obliques and no nadir images. Using modern processing methods we can use this oblique-only dataset to produce 3D mesh models, point clouds and even true-orthophotos with almost no manual input. It doesn’t capture any nadir (straight down) images. Our aim for a circular survey is to capture high and low obliques of the area of interest. The circle plan isn’t just for linear routes, it can also be used to capture larger areas, such as the plan below. This survey would take approximately 8 minutes. The white line is the path of the aircraft and the red box is the project area. The image below shows a plan for a single set of circles over a town. Each circle overlaps the previous circle by about 65% so the circles are actually more oval-shaped. Instead of flying back and forth, the survey aircraft instead flies an advancing circular path over the Area of Interest. The Circular Trajectory is very different, but for some very good reasons which we’ll come onto further down. XCAM can capture using this method as well as circles. The camera points straight down and the aircraft flies in a straight line in one direction, turns around and flies back in the opposite direction, akin to mowing the lawn. Most traditional aerial survey methods use a Track Pattern to systematically capture imagery. In this article we take a look at the benefits of using the WaldoAir XCAM patent-pending circular path aerial survey method.Īs you hopefully already know, XCAM is a small aerial survey camera system which is designed to be highly cost-effective for survey areas larger than about 10 acres (the sweet spot for drones) and smaller than 2000 square kilometres (the sweet spot for larger cameras fitted to the inside of a dedicated survey aircraft).Ī unique and impressive part of the XCAM system is the patent-pending Circular Trajectory flight pattern which provides XCAM with a significant lead over all other survey systems in the generation of high-resolution urban 3D models.
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