MN/DOT PITS - INDIVIDUAL TEST HOLES



Field

Description

Main ID Information

Metadata Updated 2007

Title

Blue Earth County Aggregate Evaluation - MN/DOT Pit Labels

Filename

Dotpits (ArcView Shapefile)

Abstract

This dataset consists of information about the Minnesota Department of Transportation auger test hole locations.

Place Keywords

Blue Earth County, Minnesota

Theme Keywords

MN/DOT, Test Holes, Drill Holes

Time Period of Content

1935-1987 (compiled in 1998)

Parent Theme

Dpitslbl.shp

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

This dataset is used to reference the locations of all known and existing MN/DOT auger test holes in Minnesota. Each pit location has several different test holes (10 to over 250). Each of these test holes has unique information associated with it. This dataset includes pit number, test hole number, and location quality.

Progress

Complete

Currentness Reference

1998-1999

Maintenance Frequency

None planned

Access Constraints

NA

Use Constraints

NA

Associated Data Sets

Dpitslbl.shp and pit_qual.dbf

Data Quality

 

Attribute Accuracy

Theses test hole locations were digitized off MN/DOT pit sheets. Most of these locations were digitized off surveyed pit sheets and thus are very accurate. However, it was difficult to obtain 4 reference points for all these pits, thus some may not be as accurate. A column within the database describes the accuracy.

Logical Consistency

NA

Completeness

These locations were digitized off surveyed point locations, thus the information should be fairly accurate (within 10 meters).

Horizontal Positional Accuracy

1:1000

Vertical Positional Accuracy

NA

Lineage

This dataset is used to reference the locations of all known and existing MN/DOT auger test holes in Minnesota. Each pit location has several different test holes (10 to over 250). Each of these test holes has unique information associated with it. This dataset includes pit number, test hole number, and location quality. These test hole locations were digitized off MN/DOT pit sheets. Most of these locations were digitized off surveyed pit sheets, thus are very accurate, however, it was difficult to obtain 4 reference points for all these pits, thus some may not be as accurate. A column within the database describes the accuracy.

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 test hole locations.

Native Dataset Environment

ArcView 3.1 / ArcInfo7.2.1

Vendor Specific Object Type

NA

Tiling Scheme

County

Spatial Object Type

Point

Transfer Size

158 kb

Entities -- Attributes

 

Entity-Attribute Overview

These points represent individual test hole locations. These test holes were digitized off MN/DOT pit sheets.

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

Dotpits.shp

Pitno

 

Number,5,0

Ex: 1035,1046, 4866, 5058,5251, 7049

This is the unique identifier that MN/DOT assigned to its pits (OLD numbering system-scheme).

 

Pitnoltr

 

Text, 2

Ex: A, AB, B, or C

Sometimes 2 or three pits grow together, or a pit expands so they put a modifier on the unique identifier instead of a new pit number (Ex: 1035A and 1035B). OLD numbering system-scheme.

 

Testhole

 

Number,3,0

Ex: 0,1,2,3,4,5,6,7,8,

9,10,11,12,13,14,15,

16,17,18..............

Unique Identifier for the test hole within a pit.

 

Locat_qual

 

Text, 4

good

The MN/DOT pit sheets have the drill hole locations surveyed and plotted on a grid. As these points were digitized, the quality of given X and Y. coordinates varied. Good quality locations are probably accurate to within a few meters.

Good at least 4 good quality x and y know surveyed reference points were used..

 

 

 

 

mod

The quality of the location is within a 10-20 meters, only 2 or 3 know x and y reference locations were used.

 

 

 

 

poor

There was not sufficient evidence to pinpoint the hole locations, however they are located as best as they could be with reference points such as road intersections, fence lines, trees, home locations, etc.