Can Landsat images help keep the GIS outputs up-to-date?
15-15: Landsat MSS resolution is equivalent to 1.1 acres. How did this fact influence PP&L in its thinking about utilizing space imagery in its geocoded data base? ANSWER From these files, ERRSAC investigators used an ESRI software package to generate a 12-class map of the Harrisburg service area: The proof-of-concept task presented by PP&L for a Goddard-directed GIS analysis was to select optimal site(s) for a heavy industrial complex. Two primary limitations were imposed: 1) the site must be within 5 km (3 mi) of a major source of water (the Susquehanna River met this condition), and 2) should exclude areas in the immediate Harrisburg district. The first step in the analysis was to generate a series of data element maps from the PP&L data base. Initially, these were formatted as printouts using a black and white Versatec Electrostatic Plotter. Here is the output for landform types, as data layers (this figure suffers from the inability of the scanner to differentiate the symbol patte
