![]() Motion blur caused by a slow shutter speed on a fast moving drone. A bright overcast day can produce the best quality images since the clouds diffuse the sunlight, creating soft consistent lighting with little to no shadows. Sunny days may seem like the ideal lighting conditions, but highly contrasting shadows and the glare from reflective surfaces can be problematic for photogrammetry software. Weather – Consistent lighting is important for capturing high-quality drone images. Below are a few factors than can influence the quality of your images. Luckily, you don’t need to be an artist to take high-quality images for drone mapping, simply learning the fundaments of taking sharp images can significantly improve the quality and consistency of your drone products. Low quality images degrade the performance of photogrammetry software which can lead to issues, such as dropped images, reduced accuracy, and inconsistent color balancing to name a few. Image quality is an important factor to the success of your drone mission. These flight lines extend well past the project area to ensure good overlap throughout the entire site. Reduce the overlap as needed, starting with the sidelap first, but avoid going below 70 percent overlap and 65 percent sidelap. When planning a mission, start with 80 percent overlap and 80 percent sidelap to ensure good coverage of your project area and maximize the accuracy of your products. Increasing overlap will also help with the reconstruction of complex geometries and homogenous image textures, such as agricultural fields, dense vegetation, and urban environments. Generally, the more overlap you have the more accurate your results will be. While it’s possible to create mapping products by manually flying a drone, using a flight planning software, such as Site Scan LE, will ensure that your images are collected at a consistent altitude and with proper overlap for efficient and reliable results.įor more information on the type of flight plans and when to use them, see the tech support FAQ: What are the flight modes available in Site Scan Flight for ArcGIS? Increase Overlap Use the Right Flight Planįlight planning is an important part of a successful drone mapping mission. However, checkpoints are still required to validate the absolute accuracy of your project. Maps with a high relative accuracy are useful for marketing, measuring distances, angles, and volumes, or creating vegetative indexes.ĭrones that are equipped with RTK/PPK GNSS can eliminate the need for GCPs. Relative accuracy is a measure of how well the dimensions of features within your drone mapping products model their real-world dimensions, independent of their actual location in the world. There are two ways to measure the accuracy of your drone mapping products: absolute and relative. Instead, use the highest GSD that fits your project requirements to create cost-effective products. ![]() After all, more detail and accuracy are better, right? However, decreasing the GSD will require more images to cover the same area, which means longer flight times, processing times, and increased disk space requirements. It may seem logical to use the smallest GSD value for every project. Less detail can be seen in this water treatment pond as the Ground Sampling Distance increases, but which on is the best image? The top-left image is ideal for projects that require precise measurements, while the bottom-right was flown in half the time and is perfectly suited for digitizing footprints.
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