Based On The Estimation Of Measurement Factors In Digital Aerial Photograph

Forest resources survey is an important component of forest resources monitoring system of China and Heilongjiang province. Forestry mapping and plant resources measurement in use of aerial photographs is the main task of plant resources survey. Color aerial photographs could reflect and record the truly color or grayness of forestry character. It had high resolving power and steady-going determined character. So it had very important function in the forest aerial survey technology.Height and crown width of each tree from64permanent sample plots for eight species(Pinus koraiensis、Abies nephrolepis、Picea koraiensis、Betula platyphylla Suk、 Ribbed Birch、Basswood、Ulmus pumila L.、Acer mono Maxim) were extracted based on the data of2008aerial photograph and Continuous Forest Inventory data in2009of Liangshui National Nature Reserve in Heilongjiang Province. The digital mapping of the IGS in VirtuoZo NT software was used to extract the data by combing method of interior orientation, relative orientation, and absolute orientation to generate stereo pairs. The prediction accuracy was analyzed between the estimated data and observed data for tree height and crown width. The results showed that the estimated accuracy of tree height and crown width was relative higher for application, the average accuracy of tree height was74.76%and the crown was80.16%. Based on the estimated data and the relationship between tree height and crown width with tree volume, the one-way and two-way volume table of aerial photographs for three conifer species were developed. The correlation coefficients between tree height, crown width and volume for eight species, respectively. The aerial photograph volume tables developed in this paper will be suitable for application.