AGGREGATE POTENTIAL BOUNDARIES BETWEEN
AGGREGATE
POTENTIAL MAPPING UNITS
DODGE COUNTY,
MINNESOTA
Field |
Description |
Main ID Information |
Metadata Updated 2007 |
Title |
Dodge County Aggregate
Evaluation Boundaries between Aggregate Potential Mapping Units |
Filename |
Agg02ln3 (ArcView
Shapefile) |
Abstract |
This dataset consists
of information about the types of geologic contacts, or boundaries, between
the mapping unit polygons of the aggregate potential layer. The seven types of contacts or boundaries
are county border, geologic contact inferred, geologic contact well
defined, channel scarp inferred, channel scarp well defined, glacial
margin inferred, channel margin well defined. |
Place Keywords |
Dodge County, Minnesota |
Theme Keywords |
Geological contacts,
channel scarps, glacial margin |
Time Period of
Content |
Fall 2001 and Spring
2002 |
Parent Theme |
NA (Agp02py3) |
Spatial Extent of
the Data |
Dodge County, Minnesota |
Contact Person |
Aggregate Resources
Mapping Program |
Contact Person
Organization/Division |
Department of Natural
Resources, Division of Lands and Minerals |
Contact Person
Position |
Geologist or GIS
Specialist |
Contact Address |
500 Lafayette Road, Box
45 |
Contact City |
St. Paul |
Contact Zip Code |
55155-4045 |
Contact Voice Phone |
651-259-5959 |
Contact Fax Phone |
651-296-5939 |
Additional ID
Information |
|
Originator |
Department of Natural
Resources, Division of Lands and Minerals, Mineral Potential Section |
Purpose |
To differentiate the
types of geological contacts so that various line symbols (e.g., solid lines,
hatched lines, or dashed lines) can be used to show the contacts between
polygons on a map. |
Progress |
Complete |
Currentness
Reference |
All data was gathered
in summer and fall of 2001 and compiled in the fall of 2001 through the
spring of 2002. |
Maintenance
Frequency |
None planned |
Access Constraints |
NA |
Use Constraints |
NA |
Associated Data Sets |
County Aggregate Mapping
Program datasets for Dodge County, including data on sand and gravel
potential, crushed stone potential, field observations, rock piles, and test
pit quality. |
Data Quality |
|
Attribute Accuracy |
The lines delineating the
sand and gravel resources and surficial geology were digitized on screen with
DOQs (1:12000 USGS Digital Orthophotoquadrangles) and DRGs (1:24000 USGS scanned topographic maps
digital raster graphics) as the backdrops.
The lines delineating the crushed stone resources were based on a
model to define a depth to bedrock surface (see the Lineage section below
for additional information). |
Logical Consistency |
Overshoots,
undershoots, etc. were fixed by a variety of techniques, thus the lines have
been checked and completed. |
Completeness |
The sand and gravel
resource units were delineated by aerial photograph (at a scale of 1:40,000)
interpretation and digitized onscreen,
using ARCVIEW with 1:12000 USGS DOQs and 1:24000 USGS DRGs as the spatially
registered backdrops. |
Horizontal
Positional Accuracy |
1:50000 |
Vertical Positional
Accuracy |
Not applicable |
Lineage |
For
sand and gravel: Color
infrared and black-and-white aerial photographs were used to delineate
geological landforms and aggregate resources. Stereoscopic pairs of color infrared aerial photographs (NAPP,
9"x9" at 1:40,000 scale, April 1991 and 1992) were used along with
reconnaissance-level, high-altitude, black-and-white photographs (1:80,000
scale). Aerial photographs (DOQs)
were also available digitally and used within ARCVIEW (1:12,000 scale). Aerial photographic interpretation was
completed with a glacial mapping technique known as the landsystems approach. This technique relies on the principle
that depositional glacial landforms are composed of a predictable range of
sediments, some consisting of sorted sand and gravel and others consisting of
silts, clays, or unsorted materials.
In addition to the landsystems approach, several other general
characteristics helped determine the nature of the material, such as tonal
contrasts, texture, context, shape, size, trend, association, and
patterns. These characteristics can
help determine the properties of the surface material (e.g., certain
vegetation grows on well drained soils such as sand and gravel, which on an
aerial photograph has a distinctive texture, tone, pattern, etc.). The
landform recognition approach (part of the landsystems approach) was also used
when interpreting the topography within Dodge County; glacial landforms have
distinct and unique shapes and patterns that can be observed in their
topographic expression. Topographic
maps (USGS 1:24,000), digital elevation models, and shaded relief maps were
all used to help delineate these sand and gravel bearing features. The topographic expression of a feature
can also be observed by looking at the distribution of lakes and wetlands. For example, a string of lakes and/or
wetlands may be the signature of a glacial outwash channel or collapsed
channel, which may host sand or gravel deposits. Several aggregate bearing features were located using this
technique (outwash channels, collapsed channels, glaciofluvial fans, eskers,
and terraces). |
Source Scale
Denominator |
1:50000 |
Spatial Reference |
|
Horizontal
Coordinate Scheme |
UTM |
Ellipsoid |
GRS80 |
Horizontal Datum |
NAD83 |
Horizontal Units |
Meters |
Distance Resolution |
NA |
Altitude Datum |
NA |
Altitude Units |
NA |
Depth Datum |
NA |
Depth Units |
NA |
UTM Zone Number |
15 Extended |
Raster only |
|
Cell Width |
NA |
Cell Height |
NA |
Spatial Data
Organization |
|
Geographic Reference
for Tabular Data |
. |
Native Dataset
Environment |
ArcView 3.1 / ArcInfo
8.0.2 |
Vendor Specific
Object Type |
NA |
Tiling Scheme |
NA |
Spatial Object Type |
Vector |
Transfer Size |
|
Entities --
Attributes |
|
Entity-Attribute
Overview |
The lines delineate the
polygon mapping units found in the aggregate potential layer. Note:
some of these lines, specifically the channel scarps and glacial
margin, are also found in the sgeoxln3 shapefile, to enable the user to
portray these special features as a continuous line symbol. |
Entity-Attribute
Detailed Citation |
ArcView specific fields include shape
(i.e., feature type - polyline), fnode_ (id of beginning node of line),
tnode_ (id of ending node of line), lpoly_ (id of polygon to the left of the
line - 0" if a line feature, not a line defining a polygon), rpoly_ (id
of polygon to the right of the line - 0" if a line feature, not a line
defining a polygon), length (length of the line segment), agp02ne3_ (unique
id for line, assigned by Arc/INFO software), agp02ne3_i (an id usually
assigned during theme creation). The aggregate potential
line attributes are described in the table below. |
Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
Agg02ln3.shp |
Uniqln_id |
|
Number,3,0 |
1 |
Dodge County Boundary |
|
|
|
|
261 |
Geological contact -
well defined |
|
|
|
|
262 |
Geological contact
inferred |
|
|
|
|
265 |
Channel Scarp - well
defined |
|
|
|
|
266 |
Channel Scarp
inferred |
|
|
|
|
270 |
Glacial Margin well
defined |
|
|
|
|
271 |
Glacial Margin -
inferred |
|
Agplntype |
|
Text, 33 |
County Boundary |
Descriptions of unique
Identifiers |
|
|
|
|
Geological Contact
(Well Defined) |
Geological contact -
well defined |
|
|
|
|
Geological Contact
(Inferred) |
Geological contact -
inferred |
|
|
|
|
Channel Scarp (Well
Defined) |
Channel Scarp - well
defined |
|
|
|
|
Channel Scarp (Inferred) |
Channel Scarp -
inferred |
|
|
|
|
Glacial Margin (Well
Defined) |
Glacial Margin well
defined |
|
|
|
|
Glacial Margin
(Inferred) |
Glacial Margin -
inferred |