9.7
Demonstration Project of Spatial Imagery Information System
공간영상정보시스템 구축 시범사업
Ho-Sang Sakong, Young-Pyo Kim, and Sung-Mi Park 2000. 11·5 vols.·Korean
Objective and Major Areas of Analysis
This study identified the present status regarding the spatial imagery information including system, utilization, distribution of information, organization and business, as well as potential demand of utilization of spatial imagery information. By analyzing overseas cases regarding spatial imagery information system, this study established basic directions and strategies to build a spatial imagery information system based on this. This study also established plans to manufacture, distribute and utilize the spatial imagery information, to develop technologies and to arrange the system to build spatial imagery information system in accordance with the established directions. Concrete promotion plans are also presented to implement these plans, which may contribute to the promotion of national business and to the establishment of policies to accelerate the utilization of satellite images.
Second, this study examined the standards on spatial imagery information to standardize the series of processes of collecting, processing, analyzing and distributing spatial imagery information. The spatial imagery information, built on the spatial imagery information system, should be easily accessible and freely usable by those who need this, and should inform the users of the contents in more details for correct usage. It is necessary to standardize the spatial imagery information first to effectively produce and utilize the spatial imagery information which is on the increase in terms of quality and quantity.
This study established several urgent standard plans for spatial imagery information, which consists of content standard plan on spatial imagery information, standard format on spatial imagery information, and meta data standard plan on geographical spatial information. Content standard was prepared on Ortho-Rectified Imagery and Digital Elevation Model(DEM) in accordance with the situation of Korea, in reference to American FGDC(Federal Geographic Data Committee) and USGS(United States Geological Survey).
Standard format was presented as deemed proper after examining existing several formats and comparing the advantages and disadvantages of GeoTiff, HDF, SDTS and BIIF which are mainly used. Meta data standard plan was prepared which can complement and upgrade provisional standards of National Geographic Information System (NGIS) which becomes the origin of spatial imagery information.
Third, the instruction on the production of spatial imagery information was carried out to build effective and consistent spatial imagery information through standard process. This study aims to prepare the standards on precision, methods and procedures to manufacture Ortho-Rectified Imagery and DEM in this demonstration project.
It is necessary to select the raw materials suitable for manufacture, in order to produce spatial imagery information, and to designate a data system including structure, coordinate system and storage format to save the data. Accordingly, this study proposed the Ortho-Rectified Imagery and detailed procedures using satellite images with high resolution and DEM sampling using numeric topographical map, as well as maintenance plans for continuous updates and precision standard for the purpose of evaluation. In the mean time, to review the utilization degree of domestic satellite images, this study produced the Ortho-Rectified Imagery and DEM using the multi-purpose practical satellite, Arirang the First, and to evaluate the precision level. This study also prepared the instruction for producing DEM and Ortho-Rectified Imagery based on this study so that it can be utilized in the project to produce the spatial imagery information.
Finally, quality control was carried out to manage and guarantee the spatial imagery information. The management of the quality of spatial imagery information involves the improvement of the quality and reliability of spatial imagery information.
Conclusion and Policy Implication
This study established a reasonable quality management by proposing quality management items for the stage of production and inspection standards for each item by examining and analyzing study cases on quality management regarding spatial imagery information. Inspection stages were determined as required in the demonstration project including primitive images, elevation and hydrosphere data, DEM, Mosaic and Fusion, Ortho-Rectified Imagery, Internet geographical
information and satellite imagery map. Inspection items and standards were also presented as necessary for quality management including format inspection, attribute inspection and evaluation of precision level for each stage. In addition, this study carried out quality management on spatial imagery information produced at this demonstration project in accordance with quality management plans presented here, presented the results and introduced the quality guarantee plans.
