COUNTY WELL INDEX (CWI) - WELL LOCATIONS



Field

Description

Main ID Information

Metadata Updated 2007

Title

Blue Earth County Aggregate Evaluation - County Well Index (CWI- MGS Database)

Filename

Cwi98pt3 (ArcView Shapefile)

Abstract

This dataset consists of the locations of wells drilled within Blue Earth County. The County Well Index (CWI) is a database that contains information about wells drilled throughout Minnesota, this data base was used to look at the geological descriptions of these wells.

Place Keywords

Blue Earth County, Minnesota

Theme Keywords

CWI, Wells, County Well Index, Geological Descriptions

Time Period of Content

Downloaded in 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

Minnesota Geological Survey

Purpose

This dataset contains the locations of the wells that were used for this study; approximately 1550 of these 2552 wells contained geological descriptions that were used in this study.

Progress

Complete

Currentness Reference

1998

Maintenance Frequency

None planned

Access Constraints

NA

Use Constraints

NA

Associated Data Sets

cwi_geod.dbf : 0ne-to-many (cwi98pt3-to-cwi_geod.dbf). Relate on unique_no.

Data Quality

 

Attribute Accuracy

The locational accuracy of these points varies. Some of the points were field checked down to the meter, others are the centroid of a 40, 10, ... acre parcel. See the complete CWI files ordered through the Minnesota Geological Survey for more detail.

Logical Consistency

NA

Completeness

The locational accuracy of these points varies. Some of the points were field checked down to the meter, others are the centroid of a 40, 10, .... acre parcel. See the complete CWI files ordered through the Minnesota Geological Survey for more detail.

Horizontal Positional Accuracy

1:1000

Vertical Positional Accuracy

NA

Lineage

The geological descriptions from these test holes were used to make interpretations and test interpretations about the geology, aggregate resources, and glacial and bedrock history of the area.

Source Scale Denominator

1:1000

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

These points represent individual wells drilled throughout Blue Earth County by a variety of sources.

Native Dataset Environment

ArcView 3.1 / ArcInfo7.2.1

Vendor Specific Object Type

NA

Tiling Scheme

NA

Spatial Object Type

Point

Transfer Size

385 kb

Entities -- Attributes

 

Entity-Attribute Overview

These points represent individual wells drilled throughout Blue Earth County by a variety of sources; referred to as the CWI.

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

Cwi98pt3.shp

Unique_no

 

Text, 6

Ex:102304, 102333

These are the unique identifiers for the wells (Relate item with cwi_geod.dbf).

 

Geoc_date

 

Number,8,0

Ex:19970225

The first four numbers represent the year, the next two numbers represent the month and the last two numbers represent the day of the month.

 

UTM_e83

 

Number, 12,3

Ex: 390032.5

X-coordinate location in UTM - NAD83, Zone15.

 

UTM_n83

 

Number 12,3

Ex: 4855510

Y-coordinate location in UTM - NAD83, Zone15.

 

Hadgeodesc

 

Text, 1

Y

Had geological Descriptions. These wells had geological descriptions that were used in this study. Y=Yes.

 

 

 

 

N

Did not use these geological descriptions. N=No