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Thinning

Thinning is needed for example to adjust density of GPS-recorded trackpoints and for equalizing observation intervals.

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ID	P	Question or exercise
3968	2	The attached file contains GPS-recorded trackpoints of Potentilla fruticosa field observations in a square kilometer. Code 1 marks the species presence locations, 0 marks the species absence. The aim is to remove close locations because these are duplicating each other and automatically tracked points close to find sites do not represent the species absence. Present a drawing depicting observation locations having interval at least 50 m. Condition: the observed presence locations must be preferred to absence locations while thinning. Add caption and legend of used signs to the drawing. How many present locations and absent locations remained after thinning? Different data were used before July, 2019.	Open