Minnesota Geological Survey

M-122, Superimposed magnetic on gravity anomaly map of southwest Minnesota

Authored by 

V.W. Chandler, Minnesota Geological Survey

Reference as:

Superimposed magnetic on gravity anomaly map of southwest Minnesota.  V.W. Chandler.  2002. 
Minnesota Geological Survey Miscellaneous Map Series, M-122,  Scale 1:250,000, 1 plate. 

The data and results of this project are available as grids, shapefiles and Arc coverages.  They are presented 
in an Arc 8 project file as m-122.mxd.  The files can be unzipped, using the WinZip program available 
on the Internet, to other drives and retain their original read/write permissions.  The project file is set to use 
relative path names.

A copy of the zipped files and the unzipped project can also be obtained on a CD by contacting the MGS 
Map Sales office at 612-627-4780, ex. 238.  A paper plot of the map 
plates can also be obtained.  The sheet is approximately 
50 inches long by 42 inches high.

Be aware that the Arc 8 project m122.mxd requires the extensions Spatial Analyst and  3-d Analyst 
to open and properly display the map.  The metadata for various grids, lines and shapefiles in the 
project may be viewed with the ArcCatalog metadata reader.

A list of the files in the project is given below:

base_covers—contains several sets of base information used on the map.  Since the map base was compiled 
from previous data coverages they are not in a single annotation coverage.
	bsanfix-contains one set of city, county, lake names
	bsanswmn—another partial set of names
	cont—county lines
	hwy—major highways
	hylni—hydro, major streams
	hylnp—hydro, minor streams
	info--Arc info files, do not delete
	lkln—lake outlines
	ptcity—city names not in the annotation covers
	rdlncity—minor roads
	Township_Range_lines—shapefile of lines
ggd2duc—gravity grid second vertical derivative, upward continued to 2 km
info--Arc info files, do not delete
mgd1d05—magnetic anomaly grid first vertical derivative
fig2.tif—regional geology image from M-121
grpt—point shapefile of gravity measurement locations
m-122.pdf—printable, viewable image of entire map
m-122.txt—map text
mnoutln—poly shapefile of Mn outline
papg—swmn study area
readme.txt—this file
umwdmk300.tif—U of M wordmark
zerocounourln—line shapefile showing location of zero contour of second vertical derivative of gravity