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and to lookup the nearest feature to a mouse click. Database information will be selected for display <br />by using a select menu (lower left in figure). For example, selecting "Reservoir" will mean that <br />clicking with the mouse on the display area will display the detailed form for the nearest reservoir. <br />The data will be displayed using the appropriate routine from the database display library, as <br />described above. The manner in which some of the displays are arranged will be decided after <br />studying options in more detail. For example, database select options may require more information <br />than just a latitude and longitude and therefore may not immediately result in a form being displayed. <br />Also, shortcuts can be made available, such as accelerator keys and mnemonic selections. <br />This tool will serve as the link between the location of data (displayed on a map) and the <br />INFORMIX database. The tool provides a link to tabular data with unique identifiers for each of the <br />spatial features (a site, line, or area). The unique identifier is also present in the relational database, <br />residing in the Geoloc table, and is the key in linking a spatial feature to tabular data in the relational <br />database. <br />GIS Controls <br />GIS displays here <br />Zoom... <br />Overlays... <br />DB Selects... <br />Diversions <br />Reservoirs <br />Gages <br />Figure 1. General map display <br />Additional features of the display will be: <br />A mouse tracker that displays the mouse location in useful units, e.g., lat/long. <br />? <br />A scale for distances, displayed in mile and kilometer (km) units. <br />? <br />A legend of symbols that are displayed, e.g., filled circles for gages ( standard symbols for <br />? <br />features are being researched ). <br />The ability to display a grid, either lat/long, or miles/km. <br />? <br />The use of standardized colors for displays; (e.g., cyan for rivers) the colors will be <br />? <br />summarized in a feature legend. <br />3 <br />A275 05.10.94 1.05-16 Malers <br />