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GROUND SAMPLING DISTANCE (GSD)
Ground sampling distance (GSD) is how far away the camera is from the ground or the subject you’re trying to capture. A lower altitude means a lower GSD, increasing accuracy and detail. However, collecting data from a lower altitude means that it will require more images to completely capture the area and thus more time. This may complicate your data processing as it adds to the size of the data files and increases processing time.
Processing Report from Agisoft Metashape Safari West October 2023.
Processing Report from Agisoft Metashape Safari West October 2023.
IMAGE OVERLAP
Overlap between images increases accuracy and helps the software make out difficult terrain. An ideal amount of overlap is 90% which will produce the most accurate results. However, this will increase the amount of images you need to cover the same surface area, increasing the time it takes to complete the data collection.
IMAGE CAPTURE
Fly as slow to minimize blur and take into account lighting conditions and how that may change between flights.
One way to make sure that your data is as accurate as possible given your lighting conditions is to use a calibration device such as the MAPIR Diffuse Reflectance Standard Calibration Target. It is important to note that this is an added expense which is not always necessary and it will add new steps to your data processing.
For more information about calibration devices and their uses visit MAPIR’s website here.
Safari West Drone Survey October 2023.
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