![]() When working with flat ground, the distance between sensor and ground is similar across the entire photo, meaning spatial resolution and GSD are relatively equal. Spatial resolution refers to the pixel size within an image with respect to some real world object or terrain feature in focus. This is normally represented by the altitude of the drone. GSD calculation considers the drone’s sensor properties and focal length (distance between sensor array and the camera lens), as well as the distance between the sensor and the ground when the photo is taken. What is the difference between ground sample distance and spatial resolution?Īs we discussed, GSD refers to the dimensions of a single pixel in an image, as measured on the ground. In this example, one pixel in the image represents a 0.82cm (~0.32in) square in the real world. If we zoom all the way in, we can see the individual pixels that make up the image. In simpler terms, the GSD represents the size of one pixel on the ground.īelow, you can see an AeroPoint captured 30m (~100ft) above the ground with a Phantom 4 RTK drone. ![]() Since we’re talking about digital photos in drone surveying, each “sample” is a pixel. Ground sample distance is the distance between center points of each sample taken of the ground. This article explains what ground sample distance is, how to calculate it, and how it relates to your drone data. Your GSD directly impacts the accuracy of your surveys, so it’s essential to understand how it works. If you’re familiar with drone surveying, you may have come across the term ground sample distance, also called ground sampling distance (GSD).
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