GIS Resources

• Michigan Georef .prj file

The parameters for MI GeoRef are included with ArcGIS and may be found under

Coordinate Systems : Projected Coordinate Systems : National Grids : NAD 1983 Michigan GeoRef (Meters).prj

More information on Michigan-specific projected coordinate systems is available from the Michigan DNR

• Calculating stream sinuosity (linear length) in ArcView and ArcMap

• Add X,Y data to ArcMap directly from Excel (PDF)

• Add X,Y coordinates to an attribute table in ArcMap (PDF)

               X-coordinate field calculator expression for the above how-to   (right-click and save file to your computer if it opens in your web browser)

               Y-coordinate field calculator expression  for the above how-to  (right-click and save file to your computer if it opens in your web browser)

• Add unique IDs to table data in ArcMap (PDF)

• Macro to "explode" multipart features into single part features. See the ArcMap online help topic "Creating, editing and running macros" for instruction onhow to use the macro. The original ESRI support article is available here

• Magnetic declination calculator  (NOAA)  (Canadian Geological Survey) Current declination (as of February 2006) is 3° 26' W at Houghton (47.09 N 88.67 W) and 3° 30' west at Alberta (46.68 N 88.48)

July 2004: 3° 20' W at Houghton, 3° 25' west at Alberta

Current change is ~ 4' westerly per year.

• Citation formats for Geospatial data and software