The DEM Accuracy Assessment Based On Statistical Nalysis Of Spatial Autocorrelation

The digital elevation model(DEM) is the expression of the surface topography ofa discrete digital,Geographic information systems,remote sensing,digital earth,virtualreality and other areas on which is the basic data of the three-dimensional dataprocessing and terrain analysis, is also one of the basic product of the national spatialdata infrastructure.the accuracy and quality control run through the processing ofproducts and useness of DEM,we are always eager to get the products of DEM,withhigh quality,high precision and more types,which could be accurately andobjiectively reflect the Earth’s surface variation——the ups and downs.So that erroranalysia and accuracy assessment of DEM is one of the hots of DEM.The study hasimportant significance in understanding of theory and practice of the DEM.The article describes the domestic over-research about error analysia andaccuracy assessment of DEM,elaborates spatial autocorrelation and Geosciencestatistical analysis,analysis the sources of DEM data products,data processingerror,the error models,and DEM modeling error of the interpolation algorithm;givies abrief introduction about the accuracy of DEM data products of the indictor assessedand approaches; Finally,the assessment and useness requirements of the DEM dataproducts in practical applications,which learn from the spatial autocorrelation theoryand buffer overlay method. In specific production practices,the description ofGeostatistical analysis of the accuracy of the DEM data products, makes us to betterunderstand the accuracy and quality control of DEM and more effective use the dataproducts of DEM.