On The National Soil And Water Conservation Information Infrastructure

The National Soil and Water Conservation Information Infrastructure (NSWCII) is a key issue for regional soil and water conservation researches. NSWCII is also one of the components of National Spatial Information Infrastructure (NSII).Based on the theory of regional soil and water conservation, spatial information sci-technology, and NSII, the systematic research has been done on the National Soil and Water Conservation Information Infrastructure, which covers the metadata standards, data quality criteria, and the development of the soil and water conversation information kit, taking the Digital Loess Plateau (DLP) as an example, the main results are as follows:1 According to the analysis of thematic data of soil and water conservation science, a set of metadata standards has been proposed, which is composed of three hierarchy (thematic layer, watershed and area, and Loess Plateau), and 5 types (metadata of thematic vector map, thematic raster map, video, text and tabular). Then metadata files on main data types have been written, some of which are shown in the thesis paper.2 The error sources, types and the elements affecting the quality of the spatial soil conservation data has been analyzed, by the view of the error and quality of spatial data. Based on the processes of the soil conservation thematic spatial data automation/digitizing, the standards and some methods are proposed for controlling errors and checking of the quality of spatial data, mainly about the thematic vector maps, and Digital Elevation Model (DEM) and remote sensing image as well.3 Employing the LIBRARIAN database model of ARC/INFO, a large quantity of vector spatial data has been systematically organized and managed, which is easy for the data to save, extract, modify and display. Based on this groundwork, the relations between the spatial data and the metadata have been established, thus enabling the easy query of spatial date and metadata and effective management.4 Digital Loess Plateau, a framework of soil and water conservation information system, has been designed.Very large volume data has been reorganized with ARC/INFO LIBRARIAN sub-system, and an interface has been developed primarily with ARCVIEW.