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Guides (7)Thermal map (4)Outputs explained (8)Tutorials (2)Measurement (2)Choosing software (3)Vegetation map (1)Accuracy and GCPs (1)
Accuracy and GCPsDrone survey accuracy, what is GSD?
A 2 cm/px map is not accurate to 2 cm. Resolution, relative accuracy and absolute accuracy are three different numbers, and clients confuse all three.
GuidesHow many photos does a drone map need? The arithmetic
Photo count is not something you choose. It falls out of your flight height, your overlap and the size of the site. Here is the arithmetic.
Outputs explainedOrthomosaic - DSM - DTM: which one do you need?
An orthomosaic, a DSM and a DTM come from the same flight and answer completely different questions. Here is how to pick the right one.
Outputs explainedWhat is an orthomosaic? The map you can measure on
An orthomosaic is not a big aerial photo and not a panorama. It is a georeferenced image where scale is constant, so measurements taken on it hold up.