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De Caceres, M. (2018) The Veg-X exchange standard - IAVS Ecoinformatics Working Group. https://miquelcaceres.github.io/VegX/articles/VegXStandard.html
Sampling features classified by shape. https://confluence.csiro.au/display/seegrid/Observations+and+Sampling#ObservationsandSampling-Samplingfeaturesclassifiedbyshape