Study On Technology Of Management Of Forest Resources Spatial Data

Forest resources data acquisition and updating is the eternal theme of forest resources survey. From the beginning of the forest survey, the practitioners take the effort to obtain accurate forest resources data on. From measurement of every tree to sampling, from investigation at opposite high place to application of aerial photo, from application of aerial photo to satellite images, from hand drawings to GIS applications, from application of topographic map with a compass to application of GPS and PDA, all that means to enhance and improve the accuracy of survey data. This study takes technical route of combining theory and practice, mean to apply "3S" technology to solve the problem which meets in the actual work of spatial data collection and updating to improve efficiency, mainly as follows:1 Using the Visual Basic6.0 as development platform and taking the integrated development of MapInfo Professional to achieve a combination of geographical and non-geographical factors to make up weaknesses of the attribute data editing capability.2 From the study of dual-mode realization of the data input, that is, the code input and the drop-down box to select input, to achieve data in the Cell component and map window interactive link. At the same time you can see small graphical data and small range of remote sensing image, to overcome the small graphic data and attribute data mismatch phenomenon.3 Breaking down the work of the collection of spatial data to compartment, so that each staff member to can complete their own work to improve the accuracy, speed and quality of data collection.4 Developed single-point image registration method, simplifies the process of image registration, improved work efficiency.5 Acquired terrain factor data by the Application of terrain data (DEM) to improve the accuracy. From the Application of DEM data to made Shaded Relief forest map, it directly indicates the three-dimensional effect, it is a new generation of terrain forest map.6 GPS data to provide accurate geographical data for spatial forest data collection and updating of graphics. This study provides a method of using these data in the actual production has been widely quoted, and achieved very good results.7 Using the data of three types of forest resources survey, to update spatial data bya local vectorization, reversing the reality of forest resource management, data "the first year clear, the second year change, the third year chaos" state.8 Remote sensing data is the major source of spatial data of forest resources. Comparing the TM images of two period time can find the forest resources changes. The change can be the target place to improve the quality of forest inventory. In this study, the distribution of NDVI to determine two of the resource changes achieved very good results.9 To manage the data of sample plot by the way of vecor is the right method to describe the spatial data truly, combined two survey system of sample field investigation and visual estimate system.