Field |
Description |
Main ID Information |
Metadata Updated 2007 |
Title |
Nicollet County Aggregate Evaluation - Features (lines) |
Filename |
Sgsymln3 (ArcView Shapefile) |
Abstract |
This dataset consists of information about the types of landforms and features that are represented by an line (arc). These landforms consist of channel scarps and stagnant ice contact ridges. |
Place Keywords |
Nicollet County, Minnesota |
Theme Keywords |
Landforms, Features |
Time Period of Content |
Summer and Fall 1999 |
Parent Theme |
NA (SG00XPY3) |
Spatial Extent of the Data |
Nicollet County, Minnesota |
Contact Person |
Aggregate Resource Mapping
Program (Geologist or GIS Specialist) St. Paul, MN 55155-4045 |
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 display linear geologic landforms and features that were too small to be mapped as polygons. |
Progress |
Complete |
Currentness Reference |
1999-2000 |
Maintenance Frequency |
None planned |
Access Constraints |
NA |
Use Constraints |
NA |
Associated Data Sets |
Surficial Geology (sg00xpy3.shp and sg00xln3.shp) |
Data Quality |
|
Attribute Accuracy |
These lines were digitized on screen with DOQ's and DRG's (topographic maps) as the backdrops. |
Logical Consistency |
NA |
Completeness |
The units were delineated by aerial photograph interpretation (1:40,000), and digitized on screen using ARCVIEW; with DOQ's and DRG's (topographic maps) as the backdrops. |
Horizontal Positional Accuracy |
1:50000 |
Vertical Positional Accuracy |
NA |
Lineage |
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 help 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 Nicollet 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 |
Raster only |
|
Cell Width |
NA |
Cell Height |
NA |
Spatial Data Organization |
|
Geographic Reference for Tabular Data |
The lines represent geologic landforms that are too small to be mapped as polygons. |
Native Dataset Environment |
ArcView 3.1 / ArcInfo 8.0.2 |
Vendor Specific Object Type |
NA |
Tiling Scheme |
NA |
Spatial Object Type |
Vector |
Transfer Size |
378 kb |
Entities -- Attributes |
|
Entity-Attribute Overview |
The lines represent geologic landforms that are too small to be mapped as polygons. |
Entity-Attribute Detailed Citation |
See table below: 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), filename_ (unique id for line, assigned by software), filename_i or filename_id if filename is less than 8 characters (an id usually assigned during theme creation). |
Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
Sgsymln3.shp |
Uniqln_id |
|
Number,3,0 |
265 |
Channel Scarp - well defined |
|
|
|
|
266 |
Channel Scarp - inferred |
|
|
|
|
267 |
Stagnant Ice Contact Ridge |
|
Sgeolntype |
|
Text, 30 |
Channel Scarp (Well Defined) |
Channel Scarp - well defined |
|
|
|
|
Channel Scarp (Inferred) |
Channel Scarp - inferred |
|
|
|
|
Stagnant Ice Contact Ridge |
Washed till, slightly sorted and mixed sands, gravels, and clays. |