TOPO Maps 1:24k Topo maps were purchased as TIFF images from SURE!Maps Raster in 1999 for the counties enclosing the project area boundary, and clipped using SURE!Maps software as closely as possible to the project area. To economize on hard drive space, TIFFs were then converted to grids using ArcInfo, clipped the the outline of the project area, and then converted back to TIFFs using the compression function in ArcInfo GRID. If the project area overlaps county boundaries, then it may have been necessary to produce at least 2 TOPO TIFFs, one for each county, which can then be used in combination to cover the project area. Topos are sometimes then compressed further using Mr. Sid. Contact Information: GIS Coordinator Institute for Fisheries Resources (IFR) 791 Eighth Street Arcata, CA 95521 (707) 822-9428