Measuring heights of standing trees based on digital photogrammetry
Tree height is one of the main factors for forest measurement and inventory. It is of great importance to measure tree height quickly and accurately. In this study, sixteen aerial photographs and the corresponding exterior orientation elements were collected for Harbin Experimental Forest Farm of Northeast Forestry University. A survey area was established and the stereopair model was developed for the area using internal orientation, relative orientation and absolute orientation techniques. On the basis of stereopair model, heights of 32 sample trees in the area were measured using professional digital photogrammetry platform in the laboratory. Heights for the same sample trees were measured using ultrasonic hypsometer in the field quasi-synchronously. The results from these two methods were compared and analyzed statistically. Results showed no significant differences among these two sets of data. The accuracy for tree height measurement using digital photogrammetry was 90.92％ . This study indicates that the use of digital photogrammetry for tree height measurement can achieve high accuracy.
digital photogrammetryheight of standing treemodel of stereopair
国家科技期刊平台
NSTL
万方数据
维普
