DIGITAL MAPPPING ASSISTANT AND LOGGER: TWO PALM APPLICATIONS FOR DIGITAL COLLECTION OF GEOLOGIC DATA USING A PDA AND A GPS RECEIVER AND A GEOTECHNICAL BOREHOLE LOGGING APPLICATION

摘要

Traditional geologic mapping employs US Geological Survey topographic maps and a field notebook. Once data are collected in the field, the data are transferred to a base map and structural data can be analyzed using a stereonet or other application. To expedite data entry, Digital Mapping Assistant (DMA-Palm) has been coded for Palm OS. Lithologic, structural, and positional data are collected using the personal digital assistant and a GPS receiver. Field data that are collected in the PDA are stored in an MS Access~R database for easy access, analysis, and preparation of GIS datasets for Arclnfo~R and/or AutoCAD Map/Land~R. DMA, developed by the author, consists of three separate forms. DMA-Palm is the main form to which all data are referenced. This form is used to store lithologic, positional, and datum information. DMA-Palm consists of fields which contain unique information that is collected at each mapping station. The other forms allow users to collect structural data in either quadrant or azimuth format. The relationship of the sub-forms to the master form allows users to collect structural data using the UserName and MapStation as the primary keys. The DMAStructure sub-forms allow handheld users to collect information for both planar and/or linear structural features and store this information for each mapping station. The structure sub-forms use common lookup lists for planar and linear features, which can be customized on the host PC and uploaded to the PDA during synchronization for immediate use. The DMAStructureQuad sub-form consists of fields which contain unique quadrant-formatted structural information that is collected at each mapping station. The DMAStructureAzimuth sub-form consists of fields which contain unique azimuth-formatted structural information that is collected at each mapping station.