Abstract

Management of Digital GCP Using ArcGIS Geodatabase for Geomatics Purposes
Track: Technology
Authors: Zainal Majeed

Malaysian Centre for Geospatial Data Infrastructure (MaCGDI), under the Ministry of Natural Resources and Environment (NRE), is responsible of providing accurate updated geospatial information and efficient access to ensure effective geospatial management for the national development and planning at all level. This is in accordance to part of the initiatives established towards the building of Spatial Data Infrastructure in Malaysia. To ensure the integration of all geospatial data in the Geographic Information System (GIS) can be utilized for analysis in supporting development and planning at all level, data shall possess complete value of attribute contents and topology, and in accordance to the Malaysian Standard for Geographic Features and Attribute Codes 1759 (MS1759). One of the outputs of the National Fundamental Dataset for General Theme (Imagery and Ground Control Point (GCP)) is to utilize the GCPs for the production of seamless orthorectified imageries of the whole country by tiling and mosaicking the aerial photo, Quickbird, Ikonos and SPOT-5 imageries of the satellites. This paper will outline the development of the GCPs as one of the fundamental input to the database, as a basis for ensuring the geolocational accuracy of other geospatial input within the desired tolerance thus enabling such output of the seamless imageries. The development shall look from the outset of collecting the GCPs in analogue till the final stage of exploiting the GCPs in digital using the ArcGIS. The three phases of the development are collection, digitization, and management of the digital GCPs. The collection phase shall look at the specifications and requirements, accuracy of collection and conveying the information, distribution of the GCPS, datum and projection, and transformation parameters from various local datums and projections. During the digitization phase, the GCPs will be assessed for accuracies prior to digitization to omit human error during conveying of the information of the GCPs from ground to sketch by using triangulation. The accepted GCPs will then be digitized in a standardized format with scale and with all attributes or metadata in accordance to the MS1759. The final stage is the management of the digital GCPs by looking at the structure of how the GCPs being shared, disseminated, exploited in the form of chip database and updated. This stage emphasizes the structure of storing, archiving and retrieval of the GCPs using the ArcGIS Geodatabase technology in ensuring an efficient management of the digital GCPs.