Comparative Analysis Between Forest Land Database And Land Database In Changsha County Based On ArcGIS Spatial Analysis

Forestry has entered the era of big data.Comparing and analyzing the data of hundreds of thousands and millions of records,the traditional manual interpretation method is no longer suitable.With the help of the spatial analysis tool of ArcGIS platform,the spatial location attribute comparison and analysis between different data sour(?)s can be completed quickly,but it should be solved the resulting problems at the same time.In this study,Changsha County was taken as the experimental object,and ArcGIS spatial analysis was used to compare and analyze the spatial location information between Forest Land Database and Land Change Survey Results Database.Find out that there are differences in the definition of forest land concept and forest land scope between forestry system and territorial system,which results in different results and distribution of forest land types.By dividing forest areas into three types:basic forest land,non-forestry management forest land and controversial forest land,the combination of ArcGIS spatial analysis tools is used to achieve relatively accurate and rapid data comparison of graphics and attributes between different data sources.It includes subtracting all subclasses on two different layers to get their difference and overlap values,obtaining attributes of subclasses on another layer and having the same or similar spatial position relationship,and solving the problem of fragmentation.The method of circumference area ratio elimination solves the problem that the original database subcompartment will be cut into fragments after simple mechanical cutting of ArcGIS spatial analysis,resulting in the loss of practical significance.Finally,relatively accurate and rapid access to Changsha County Forest Land Database and Changsha County Land Change Survey Results Database,because of classification criteria,specific processing methods,human factors,update time caused by the difference in the identification of land classes of sub-class spatial and geographical location information.