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Calculates the map area, using bearings and distances, either from a traverse or by GPS. Able to annotate maps and print at different scales and import/export files to GIS. Allows an image (scanned aerial photo or map) to be added to the background of a map. Boundaries can then be over-drawn, and areas and distances estimated. Stocking
A tree that appears borderline using a BAF 10 instrument was measured as 12.4 inches (310 mm) DBH. The horizontal distance from the sampling point to the center of the tree is 34 feet (10 m). DBH x PRF = Limiting Distance 12.4in. x 2.75ft./in. = 34.1ft. 34.1 feet (limiting distance) is greater than 34 feet (measured distance), tree is in.
In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2] Tree volumes and weights are not directly measured in the field, but computed from other variables that can be measured. [3] [4]
The same process is used to measure the height or extension of the base of the tree above or below eye level where D1 is the distance to the base of the tree and (b) is the angle to the base of the tree. Therefore, the vertical distance to the base of the tree above or below eye level is [h2 = sin(b) x D2]. Common sense should prevail when ...
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Photographs of trees can be used to determine girth or other measurements if there is a something of known size in the photo to provide a scale. The following information must be known to approximate the measurements: 1) distance of the camera from the tree, 2) distance from the camera to the scale, and 3) size of the object to be used as a scale.
A radial tree, or radial map, is a method of displaying a tree structure (e.g., a tree data structure) in a way that expands outwards, radially. It is one of many ways to visually display a tree, [2] [3] with examples dating back to the early 20th century. [4] In use, it is a type of information graphic. Radial vs. triangular tree layout
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