![]() GSD is a factor for anyone who uses aerial surveying to create accurate maps and models. To play it safe, land surveyors always use the lowest possible value when calculating GSD. However, if the mistake is extrapolated over hundreds of thousands of pixels, it will create a serious mismatch between your map and reality, making measurements near impossible. An error of a centimeter or less may seem minor. Understanding pixel size in an aerial image by calculating the middle point of consecutive pixels is necessary to grasp the full scale of your map and make decisions based on clear information. Image GSD is an important calculation for both aerial photography and photogrammetry, which is a commonly used technique for creating 3D topographic maps. ![]() The GSD describes the distance between two consecutive pixel centers. In this case, a sample is equivalent to a single pixel. ![]() What is ground sample distance?ĭrone maps, like any digital image, are essentially combinations of small squares of a single color, called samples. Whether you’re hired to determine the exact boundaries of a piece of land, to map the flow of a river, or to create a 3-D model of a new development, GSD is a metric you simply can’t do without. Without it, you run the risk of collecting inaccurate data or having a map that isn’t useful. Calculating GSD is essential to determining the scale of your mapping project and ensuring reliable results. If you use an aerial drone to survey land, you need to know about ground sample distance, or GSD for short.
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