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The Tree layer is one of the layers specific to Field-Map. It consists of center points and polygons circumscribing tree stem at breast height (basal area of the tree). It has a number of predefined system attributes such as DBH, height, crown base, etc. Optionally, a tree can also be described using horizontal crown projection, vertical crown profiles and a stem profile.
Trees can be visualized on the map (tree center points, basal area polygons and crown projections) or in combination with transects (stems and crown profiles).
Measurement of trees is extensively supported by external electronic measurement devices. Laser range finders, electronic inclinometers, electronic compasses and electronic callipers are used for mapping and measurement of 3D features describing trees. Based on these measurements Field-Map automatically calculates the stem volume, the crown surface and volume as well as the area of crown projection.
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