Ohio Topographic Map Index
Ohio Geographically Referenced Information Program
Ohio Statewide Imagery Program (OSIP) Downloads
Ohio Geodata Distribution (DLGs/DEMs/DOQQs/DRGs)
- Digital Topo Files
On-Line Calculator for Current Magnetic Declination (http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp)
Lat/Lon to UTM (http://www.ngs.noaa.gov/cgi-bin/utm_getut.prl)
UTM to Lat/Lon (http://www.ngs.noaa.gov/cgi-bin/utm_getgp.prl)
output of either above calculations also shows grid convergence.
Python script to convert USGS DLG-O files to DXF (requires Tkinter and ScientificPython)
Self-extracting zip of Windows executeable of above script. Extract to a directory and then run the dlg.exe file in that directory. (All necessary files included, no need to install Python or Tkinter or ScientificPython)
Python script to convert ESRI GRID DEM to XYZ DEM. (requires Tkinter)
Self-extracting zip of Windows executeable of above script. Extract to a directory and then run the grid2xyz.exe file in that directory.
IOF Control
Descriptions - learn what all those little hieroglyphics
mean
ISOM
Symbol Index - International Symbols for Orienteering -
descriptions, definitions and specifications of O-map
symbology
TopoZone -
online topographic maps
myTopo
- Custom-build a printed topo or aerial photo map. Center your
seamless map online, customize with titles, navigation grids,
and your name, and we'll print and ship your maps on
waterproof, tear-proof paper.
TerraServer -
contains 3.3 tera-bytes of high resolution USGS aerial imagery
and USGS topographic maps.