Ohio Topographic Map Index - download at the bottom of this page.
Ohio Geographically Referenced Information Program
Ohio Statewide Imagery Program (OSIP) Downloads - Source for State Color Aerial photography flown in 2007/2008 and LiDAR data flown at the same time. Images can be viewed with Arc/GIS Explorer (http://www.esri.com/software/explorer/index.html)
- OSIP1 Data - 2006-2010
- OSIP2 Data - 2011-2014
Ohio Geodata Distribution (DLGs/DEMs/DOQQs/DRGs) - Digital Topo Files
- DRG - Digital Raster Graphics - i.e. scanned USGS topo sheets projected to Ohio State Plane Coordinates NAD27.
- DOQQ - Digital Orthophoto Quad Quads - i.e. BW aerial photography showing one quarter of each quad sheet.
Ohio's Location Based Response System - LBRS Data by County
On-Line Calculator for Current Magnetic Declination (http://www.ngdc.noaa.gov/geomag-web/)
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) - Download at the bottom of this page.
Self-extracting zip of Windows executable 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) - Dowload dlg.exx below and rename to dlg.exe to execute.
Python script to convert ESRI GRID DEM to XYZ DEM. (requires Tkinter) - Download at the bottom of this page.
Self-extracting zip of Windows executable of above script. Extract to a directory and then run the grid2xyz.exe file in that directory. Download grid2xyz.exx below and rename to grid2xyz.exe to execute.
* 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.
* Links need to be updated.