Field |
Description |
Main ID Information |
Metadata Updated 2007 |
Title |
Blue Earth County Aggregate Resource Evaluation - Field Observations |
Filename |
Fieldobs (ArcView Shapefile) |
Abstract |
This dataset includes information gathered in the field. Field work was completed in the summer and fall of 1998. It includes approximately 450 field observation sites within Blue Earth County. Includes a field description of each site, the dominant type of material encountered, the source of information, type of site, unit thickness, overburden thickness, tells if it was sampled or not, and gives the gravel percent for all sampled deposits. |
Place Keywords |
Blue Earth County, Minnesota |
Theme Keywords |
Field Observations, Aggregate Resources, Surficial Geology |
Time Period of Content |
Summer and Fall 1998 |
Parent Theme |
NA |
Spatial Extent of the Data |
Blue Earth County, Minnesota |
Contact Person |
Aggregate Resources Mapping Program |
Contact Person Organization/Division |
Department of Natural Resources, Division of 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 Minerals, Mineral Potential Section |
Purpose |
To summarize the field observations; these observations were made to confirm air photo interpretations that identified potential aggregate bearing landforms. |
Progress |
Complete |
Currentness Reference |
All field observations were completed in the summer & fall field session of 1998 (June-October). |
Maintenance Frequency |
None Planned |
Access Constraints |
NA |
Use Constraints |
NA |
Associated Data Sets |
Aggregate Resources of Blue Earth County, Minnesota |
Data Quality |
|
Attribute Accuracy |
A GPS unit was used to determine the locations of the data points, these points were downloaded and slightly revised based on field observations, topographic maps, and aerial photographs. The GPS unit (with differential correction) is accurate to approximately a few meters. The topographic maps are 1:24,000 and the aerial photographs are 1:40,000 scale. |
Logical Consistency |
NA |
Completeness |
The data points were gathered at the location where field observations took place. |
Horizontal Positional Accuracy |
GPS Unit with differential correction ( 2 meters) |
Vertical Positional Accuracy |
|
Lineage |
All point locations were recorded and downloaded from a GPS unit. These coordinates were then checked with field notes and topographic maps to assure accuracy. Some slight changes were made based on field notes (at a distance measurements/observations). |
Source Scale Denominator |
100 |
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 |
NA |
Native Dataset Environment |
ArcView 3.1 and ArcInfo7.2.1 |
Vendor Specific Object Type |
Point |
Tiling Scheme |
County |
Spatial Object Type |
Point |
Transfer Size |
106 kb |
Entities -- Attributes |
|
Entity-Attribute Overview |
A description of field observation sites, type of site, unit thickness, overburden thickness, and if a sample was collected or not. |
Entity-Attribute Detailed Citation |
See table below: Arcview specific fields include shape (i.e., feature type = point), area (0 for points), perimeter (0 for points), filename (unique id for point, assigned by the 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 |
fieldobs.dbf |
Field_stop |
|
Text, 8 |
Ex: J-1, R-3 |
Unique Identifiers used in the field, letters have no significance. |
|
Site_type1 |
|
Text, 16 |
Badger Hole |
Describes how the material was exposed. Badger dug several feet into the surficial material. |
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Bank |
A bank of a cliff. |
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Basement |
Excavation of a basement by a backhoe. |
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Construction |
Mining for fill material and/or other construction. |
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Ditch |
Material with no vegetation along road. |
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Drill Hole |
Test hole drilled with a 4 inch auger. |
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Foundation |
A foundation was being dug, exposing material. |
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Gravel Pit |
Materials exposed in gravel pit. |
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Gully |
Materials exposed in gully due to erosion. |
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Judicial Ditch |
Materials exposed in manmade ditch. |
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Quarry |
Bedrock units exposed in a quarry. |
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Road Cut |
Materials exposed in a road cut |
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Road Cut Gully |
Materials exposed in gullies along road cuts. |
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Slump |
Material exposed on steep slopes due to slumping. |
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Stream |
Material exposed in stream cuts along rivers. |
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Surface |
Exposures of bedrock on the surface. |
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Trench |
Trenches for pipelines, tiling, cables, etc. |
|
Site_type2 |
|
Text, 16 |
Drill Hole |
Test hole drilled with a Giddings Soil Probe. |
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Excavation |
Badger Holes, Trenches, Construction Areas, or Foundations |
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Exposure |
Bedrock exposures. |
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Gravel Pit |
Gravel Pits Exposing Sand and Gravel Material. |
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Outcrop |
Stream, Road-Cut, Bank, Judicial Ditch, or Slump. |
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Quarry |
An existing quarry exposing bedrock. |
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Material |
|
Text, 16 |
Ex: Sand, Gravel, Clay, Cobbles, Silt, Limestone, Sandstone. |
Describes the dominant type of material at each observation site. |
|
Fielddesc |
|
Text, 80 |
Ex: Drill Hole (0-9 ft) 0-6 Till, 6-9 Gravel. |
A short field description of the observation site. |
|
Unitthick |
|
Text, 8 |
Ex: 5, 10, >15, <30 |
A description of the thickness of the unit in feet, with "<" or ">" modifiers. |
|
Overthick |
|
Text, 8 |
Ex: 5, 10, >30, <3 |
A description of the thickness of the overburden covering the unit, with "<" or ">" modifiers. |
|
Unitsamp |
|
Text, 4 |
Y |
Y=Yes the site was sampled. |
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N |
N=No the site was not sampled. |
|
Gravpct |
|
Number,3,0 |
Ex: 23, 32, 45, 50 |
The percentage of gravel found within the sample. Sieve analysis completed. |
|
Thickmod |
|
Text, 4 |
> |
Modifies the Thick (Thickness Field). Greater Than |
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< |
Less Than. |
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Thick |
|
Number,3,0 |
Ex: 10, 15, 30, 40 |
Described the thickness of the unit at the observation site in feet. |
|
Overmod |
|
Text, 4 |
< |
Modifies the Over (Overburden Field). Greater Than. |
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< |
Less Than |
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Over |
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Number,3,0 |
Ex: 3, 5, 10, 15, |
Describes the thickness of overburden (material) covering a unit. |