8000 - Laserfiche WebLink

Home Browse Search

steps involved in developing the GCES/GIS data base, including the topographic data derived from the base map development. The design of the GIS data base was developed cooperatively during a meeting held February 6, 1991, of representatives of the USGS, GCES, LAPS, and the Reclamation Remote Sensing and Geographic Information Section in Denver. The data base design contains two components: "structure" and "content." "Structure" includes the layout of computer directories; for example, data can be grouped by theme (i.e., topography) or by spatial location (i.e., river reach). "Content" is the data which includes category and subcategory designations such as "geology and formation" or "hydrology and flow velocity." All ARC/INFO coverages or data layers are stored in a computer directory tree structure under one master directory, tentatively called GCES. Two types of subdirectories are found under the directory GCES. One directory contains basin-wide data such as sampling sites and climatic monitoring stations. The other contains fourteen directories dividing the data base by geomorphic reach, as defined by Schmidt and Graf (1990). The relationship between monitoring and special study sites by geomorphic reach appears in Appendix A-Site Segregation. Second level subdirectories of the thirteen selected monitoring sites and two special study sites will reside within each appropriate reach. Within each of the monitoring site directories, third level sub-subdirectories representing data themes will be located. Within each theme, ARCANFO coverages will represent the data sets developed by the Remote Sensing and Geographic Information Sections, GCES, NPS, and other contributors. An example of the data base structure is described on figure 7. DATA BASE STRUCTURE GCES I BASINIWIDE REACH-2 I I I I I I REACH-3 REACH-4 REACH-5 REACH-6 REACH-7 I ETC. I RIVER MILES I DATING I REFERENCES CLIMATE HYDSITES ELEVATION SITE3 SITE4 I I I I I I I I I i I I I TOPOGRAPHY I SOILS I HABITATS I FAUNA I RECREATION I MANMADE I LEGEND GEOLOGY HYDROLOGY VEGETATION ARCHEOLOGY REFERENCEPTS TEMP Figure 7. - Example of data base structure. 10