Study On Key Techniques Of Spatial Data Acquiring And Updating Of Forest Resources Inventory

The data acquired from forest resources survey are essential to forest management,such as afforestation checking and designing,deforestation designing and confirming,pest controlling, forestland requisitioning and occupating,forest industry,forest fire preventing and so on.So,it should be comprehended the forest resources state and trends timely and accurately to meet the demand from forest production management and resources management.With the development of new techniques, such as Mobile-GIS,raster to vector and spatial analysis,the updating technique of forest resources data was promoted.This paper focuses on the technique of forest data rapid editing and updating, details as follows:1) presenting the traditional updating means of forest resources data,summarizing the relative techniques by application layer,and putting forward the new mode to updating the forest resources data.2) designning the integrative model combining indoor with field work for forest resources data updating based on mobile GIS,which can link the collecting and editing data in the field with the processing and managing in the background.These techniques will improve the collecting accuracy in the field and enhance the efficiency of date updating and management.3) the format of updating data of forest resources was difference in each provinces,some surveyed data were storaged in raster format,which is very hard to digitalized.Aimming at those characteristics of scanning map and summarizing the traditional vectorization algorithm,the model of grid and vector mixed-editor was put forward for the rapid extraction of forest updating data.4) In order to solve the uncertainty data caused by the different scale,accuracy and obtained manner during the updating forest resources data.The key model to resolve the uncertain problems was studied,and the model of forest resource data updating was achieved.5) Developing the platform software FORESTAR-US for forest resources data updating,and combining with FORESTAR-Mobile software to form an integrated forest resource data updating platform.The main innovation of this paper as follows:1) After summarizing the traditional methods of raster to vactor,the concept of raster and vector mixed-editor was put forward and their model was build.Furthermore,this model is applied in processing of update data based on scanning mapping.2) Bring forward the indoor and field integrated model of forest resources data updating based on mobile-GIS.3) Designning the new updating model for forest resources data,which solves the border uncertainty caused by the different scale,accuracy and obtained manner of data resources is given.4) Developing the platform software FORESTAR-US for forest resources data updating,and combining with FORESTAR-Mobile software to form an integrated forest resource data updating platform.These research results were applied to the projects "Geographic information management system of Benxi City's forest resources" and "Data Processing system of public welfare forest in Jiangxi province"Finally,this paper discussed the issue needed to be further researched,such as stand growth model, automatic extraction information of forest resources based on remote sensing,mobile GIS Combinated with wireless network updating mode,constant improving of FORESTAR-US and FORESTAR Mobile based on temporal GIS data management.