He and Will Blozan [22] had previously been using cross-triangulation methods to measure tree heights prior to adopting the laser rangefinder techniques. A review of historical accounts of large trees and comparisons with measurements of examples still living [19] found many additional examples of large tree height errors in published accounts. A very accurate angle measurement is required by the process. A theodolite with an electronic distance measurement EDM0 function or Total Station can provide accurate heights because a specific point on the tree crown could be consistently chosen and "shot" through a high magnification lens with cross hairs mounted on a tripod which further steadied the device The drawbacks are the prohibitive cost of the instrument for average users and the need for a well cut corridor for horizontal distance measurement has to be cleared for every measurement, and the general lack of easy portability. Heights are determined by measuring the distance to the ground from the air, the distance to the tops of the trees, and displaying the difference between the two values. Using Street View one may adjust the altitude of a New Placemark to align with the top of a tree or building, and other methods include estimating total building or tree height from shadow length in a 2D Aerial Photo or Satellite image. Mathematically since the sine of a negative angle is negative, we always get the following formula:

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He and Will Blozan [22] had previously been using cross-triangulation methods to measure tree heights prior to adopting the laser rangefinder techniques. A review of historical accounts of large trees and comparisons with measurements of examples still living [19] found many additional examples of large tree height errors in published accounts. A very accurate angle measurement is required by the process. A theodolite with an electronic distance measurement EDM0 function or Total Station can provide accurate heights because a specific point on the tree crown could be consistently chosen and "shot" through a high magnification lens with cross hairs mounted on a tripod which further steadied the device The drawbacks are the prohibitive cost of the instrument for average users and the need for a well cut corridor for horizontal distance measurement has to be cleared for every measurement, and the general lack of easy portability. Heights are determined by measuring the distance to the ground from the air, the distance to the tops of the trees, and displaying the difference between the two values. Using Street View one may adjust the altitude of a New Placemark to align with the top of a tree or building, and other methods include estimating total building or tree height from shadow length in a 2D Aerial Photo or Satellite image. Mathematically since the sine of a negative angle is negative, we always get the following formula:

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