The geo_net coverage includes polygons that are map units and
open water, and arcs that are contacts, color boundaries, and
shoreline.
The geo_net.pat INFO file consists of the following items:
GEOCODE--Refers to the type of polygon and is one of the following:
the map unit abbreviation, "lake", "island", or "river".
AGE--Refers to the age of the map unit and is one of the following:
"Holocene", "Holocene and Late Wisconsin", "Late Wisconsin", "Early
Wisconsin", or "Pre Wisconsin".
MORAINES--A modifier to the map unit indicating if the unit is a
moraine and is one of the following: "Ground moraine", "Ground
moraine under Lake Michigan", "Ground moraine under Lakes Michigan and
Huron", "Ground moraine under Lake Superior", "End moraine", or
"Attenuated drift".
MAP_UNITS--A description of the soils within the map units (see below).
MODIFIER--Indicates the names of rivers, lakes, or islands or
indicates if a map unit is submerged.
COLOR--indicates the number of the shade unit in shadeset color524.shd
used to fill the map units when plotted using the AML script superior.aml.
Items in geo_net.pat are defined as follows:
GEOCODE MAP_UNITS, (AGE)
lm LAKE CLAY AND SILT UNDER LAKES MICHIGAN, HURON, AND
SUPERIOR (HOLOCENE)
lc LAKE SILT AND CLAY UNDER LAKES MICHIGAN, HURON, AND
SUPERIOR (HOLOCENE)
ls LAKE SAND AND GRAVEL UNDER LAKE SUPERIOR (HOLOCENE)
al ALLUVIUM (HOLOCENE AND LATE WISCONSIN)
hp PEAT AND MUCK (HOLOCENE AND LATE WISCONSIN)
ed DUNE SAND (HOLOCENE AND LATE WISCONSIN)
lds DELTA SAND (HOLOCENE AND LATE WISCONSIN)
lga LAKE GRAVEL (HOLOCENE AND LATE WISCONSIN)
lca LAKE SILT AND CLAY (LATE WISCONSIN)
lsa LAKE SAND (LATE WISCONSIN)
gg OUTWASH SAND AND GRAVEL (LATE WISCONSIN)
kg ICE-CONTACT SAND AND GRAVEL (LATE WISCONSIN)
tc CLAYEY TILL, Ground moraine (LATE WISCONSIN)
tc CLAYEY TILL, Ground moraine under Lake Michigan
(LATE WISCONSIN)
tc CLAYEY TILL, End moraine (LATE WISCONSIN)
tcr CLAYEY TILL, Attenuated drift (LATE WISCONSIN)
tl LOAMY TILL, Ground moraine (LATE WISCONSIN)
tl LOAMY TILL, Ground moraine under Lake Michigan
(LATE WISCONSIN)
tl LOAMY TILL, End moraine (LATE WISCONSIN)
tlr LOAMY TILL, Attenuated drift (LATE WISCONSIN)
td CALCAREOUS SANDY LOAMY TILL, Ground moraine
(LATE WISCONSIN)
td CALCAREOUS SANDY LOAMY TILL, Ground moraine under
Lakes Michigan and Huron (LATE WISCONSIN)
td CALCAREOUS SANDY LOAMY TILL, End moraine (LATE WISCONSIN)
tdr CALCAREOUS SANDY LOAMY TILL, Attenuated drift
(LATE WISCONSIN)
tdb NONCALCAREOUS SANDY LOAMY TILL, Ground moraine (LATE
WISCONSIN)
tdb NONCALCAREOUS SANDY LOAMY TILL, Ground moraine under Lake
Superior (LATE WISCONSIN)
tdb NONCALCAREOUS SANDY LOAMY TILL, End moraine (LATE WISCONSIN)
tdr NONCALCAREOUS SANDY LOAMY TILL, Attenuated drift (LATE
WISCONSIN)
ts SANDY TILL, Ground moraine (LATE WISCONSIN)
tsr SANDY TILL, Attenuated drift (LATE WISCONSIN)
tde SANDY LOAMY TILL (EARLY WISCONSIN)
tlp LOAMY TILL (PRE WISCONSIN)
tlq LOAMY TILL (PRE WISCONSIN)
The geo_net.aat INFO file consists of the following items:
LTYPE--Refers to the type of arc and is one of the following:
"contact", "shoreline", "map boundary", or "null". Null is the
imaginary line separating streams from lakes.
ACCURACY--Refers to accuracy of location of arcs in the geo_net
coverage and is either "certain" or "inferred".
The gla_lin coverage contains lines that represent linear glacial
features. The gla_lin.aat INFO file consists of the following items:
TYPE--Refers to the type of glacial feature described by the arc
and is one of the following: "esker", "map boundary", or "limit of
glacial advance".
MODIFIER--Refers only to limits of glacial advance that are
"interlobate".
ACCURACY--Refers to accuracy of location of arcs in the gla_lin
coverage and is either "certain" or "inferred".
The gla_pnt coverage contains points that represent drumlins,
places where the direction of ice movement is indicated by
striations, or the location of important stratigraphic sections.
The gla_pnt.pat INFO file consists of the following items:
TYPE--Refers to the type of feature shown at the point and is
one of the following: "drumlin", "direction of ice movement",
or the name of important stratigraphic sections.
ANGLE--Refers to the direction of drumlin or ice movement; in
degrees measured clockwise from north.
MRKANGLE--Negative of ANGLE; useful for plotting symbols in ARCPLOT.
Hydr_lin is a line coverage created after scanning the hydrographic
layer that was used in the original paper map. It has no user-defined
attributes.
Topo_lin is a line coverage created after scanning the topographic
layer that was used in the original paper map. It has no user-defined
attributes.
Bnd_lin is a line coverage created from 1:2,000,000-scale U.S.
Geological Survey Digital Line Graph coverages (DLG). It contains
lines representing the U.S./Canada international boundary and state
boundaries. The bnd_lin.aat INFO file contains the following item:
TYPE--Refers to the type of line and contains the values: "state
boundary", "international boundary", or "map boundary".
Bnd_net is a polygon coverage created from 1:2,000,000-scale DLG
coverages and contains political and administrative boundaries.
To decrease the size of the coverage, all user-defined attributes have
been removed except "STATE_NAME" and "AREA_NAME".
Rd_lin is a line coverage created from 1:2,000,000-scale DLG coverages.
The coverage contains lines representing roads in the map area.
All DLG attributes have been stripped from the lines except
ENTITY_LABEL, ROUTE_NUMBER1, ROUTE_NUMBER2, and ROUTE_NUMBER3 which
contain the federal and state highway number designations.
Rr_lin is a line coverage created from 1:2,000,000-scale DLG coverages.
The coverage contains lines representing railroads in the map area.
It has no DLG attributes.
Grid_lin is a line coverage created to display projection lines in
one degree increments. It has no attributes.
