an extensible approach to imagery of gridded data
A program offering a variety of cartographic techniques for mapping gridded data is described. Dot-distribution maps, several forms of contour maps and screen-toned maps are currently implemented for plotter and vector CRT. The structure and logic of the program is discussed and illustrated. The approach requires only local access to a data grid in a paging environment, allowing large data sets to be manipulated. Maps output may be plotted at any scale, irrespective of the size of the plotting device. Additional graphic techniques and output devices are readily accommodated, and will become even more so when full virtual memory is implemented. Possibilities for image overlay are discussed and illustrated, and plans for data overlay are outlined.
gridded data dot-distribution mapping contour mapping virtual memory virtual graphics spatial gradients spatial analysis thematic mapping halftone imagery device independence inclined contour mapping vector graphics cartography analytic hill-shading