Carlton County Geologic Atlas Part B

SDTHPY metadata
Modeled Surficial Sand and Gravel Thickness

Description of data created for County Geologic Atlas Series C-19

Metadata created using Minnesota Geographic Metadata Guidelines version 1.2
Metadata content prepared 2011-08-19

Section 1

Identification Information - - - - - - top

Originator

Minnesota DNR Division of Ecological and Water Resources - County Geologic Atlas and Regional Hydrogeologic Assessment Program

Title

 SDTHPY

System Name

Abstract

Modeled surficial sand and gravel thickness in Carlton County, Minnesota

Purpose

County Geologic Atlas and Regional Hydrogeologic Assessment Program,
Carlton County Geologic Atlas, Part B, County Geologic Atlas Series C-19

Time Period of Content Date

August, 2011

Currentness Reference

Publication date

Progress

Complete

Maintenance and Update Frequency

None Planned

Spatial Extent of Data

Carlton County, Minnesota

Bounding Coordinates

Place Keywords

Minnesota, Carlton County

Theme Keywords

surficial sand and gravel thickness

Theme Keyword Thesaurus

None

Access Constraints

None

Use Constraints

Users may wish to verify critical information; sources include both the references here and information on file in the offices of the Minnesota Geological Survey and the Department of Natural Resources. Every effort has been made to ensure the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, boundaries, or locations of improvements.

Contact Person Information

See Metadata Reference Information section, below

Browse Graphic File Name

Browse Graphic File Description

Associated Data Sets

Carlton County Geologic Atlas, Part A, County Geologic Atlas Series C-19, published by the Minnesota Geological Survey, 2009. More information and downloadable data for Part A available on the MGS ftp site.

Section 2

Data Quality Information - - - - - - top

Attribute Accuracy

Logical Consistency

Data are topologically correct using ArcGIS 10.0

Completeness

Complete

Horizontal Positional Accuracy

unknown

Vertical Positional Accuracy

not applicable

Lineage

The primary data used to construct this file was derived from well logs in the County Well Index (CWI) database managed by the Minnesota Department of Health and the Minnesota Geological Survey (MGS) with verified locations. Using a custom ArcGIS extension (DNR Groundwater Tools, generate well stick diagrams) 55 west-east geologic cross sections were created with modified versions of the Minnesota Geological Survey shapefile (stratln.shp) showing the base of the surficial sand. Using another custom DNR extension (DNR Groundwater Tools, generate XYZ points from profile lines) the vertices of the shapefile lines were converted to point shapefiles that also have elevation above mean sea level (MSL) as an attribute. To create this file the points that defined the base of the surficial sand layer were selected to create part of the dataset that was interpolated into a grid file that represents the bottom of the surficial sand. A second point file was created to represent the land surface elevation around the edge of the surficial sand. This file was created by selecting the surficial sand polygons from the MGS surficial geology file, dissolving the boundaries between the polygons, and creating a file with points at 100 meter intervals along the boundaries of the surface sand with ArcGIS. Surface elevation values from a land surface DEM were added to the point records as an elevation field using ArcGIS. These two point shape files were merged. Then a third data set of assumed or estimated surficial sand bottom elevations was created for certain areas where very little well data were available and incorporated into the merged shape file. The resulting point file was interpolated using a spline tension method with default parameters in Arc GIS. The resulting grid elevation file was subtracted from the land surface DEM to produce a thickness grid file of the surficial sand. The final raster was converted to a polygon shapefile.

Source Scale Denominator

100000

Section 3

Spatial Data Organization Information - - - - - - top

Native Data Set Environment

ArcGIS 10.0

Geographic Reference for Tabular Data

Not Applicable

Spatial Object Type

Vector

Vendor Specific Object Types

polygon

Tiling Scheme

state

Section 4

Spatial Reference Information - - - - - - top

Horizontal Coordinate Scheme

UTM

Ellipsoid

GRS1980

Horizontal Datum

NAD83

Horizontal Units

meters

Distance Resolution

meters

Altitude Datum

n/a

Altitude Units

n/a

Depth Datum

n/a

Depth Units

n/a

Cell Width

0

Cell Height

0

Latitude Resolution

0

Longitude Resolution

0

UTM Zone Number

15

SPCS Zone Identifier

0

County Coordinate Zone Identifier

0

Coordinate Offsets or Adjustments

n/a

Map Projection Name

n/a

Map Projection Parameters

n/a

Other Coordinate System's Definition

n/a

Section 5

Entity and Attribute Information - - - - - - top

Entity and Attribute Overview

Entity and Attribute Detailed Citation

HTML Table (Not Available)

Section 6

Distribution Information - - - - - - top

Publisher

Minnesota DNR Division of Ecological and Water Resources

Publication Date

2011

Contact Person Information

See Metadata Reference Information section, below

Distributor's Data Set Identifier

SDTHPY

Distribution Liability

This map was prepared from publicly available information only. Every reasonable effort has been made to ensure the accuracy of the factual data on which this map is based. However, the Department of Natural Resources does not warrant the accuracy, completeness, or any implied uses of these data.

Users may wish to verify critical information; sources include both the references here and information on file in the offices of the Minnesota Geological Survey and the Department of Natural Resources. Every effort has been made to ensure the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, boundaries, or locations of improvements.

Transfer Format Name

shapefile

Transfer Format Version Number

Transfer Size

Ordering Instructions

Download ArcGIS shapefiles from:
Carlton County Geologic Atlas, Part B: Metadata for GIS and Digital Data

Online Linkage

Carlton County Geologic Atlas, Part B: Metadata for GIS and Digital Data

Section 7

Metadata Reference Information - - - - - - top

Metadata Date

2011-08-19

Contact Person Information

GIS Specialist, Atlas/Assessment Program
Minnesota DNR - Division of Ecological and Water Resources
500 Lafayette Road
Saint Paul, MN 55155
Phone: (651) 259-5693 or (651) 259-5700
FAX: (651) 296-0445
E-mail:

Metadata Standard Name

Minnesota Geographic Metadata Guidelines

Metadata Standard Version

1.2

Metadata Standard Online Linkage

http://www.lmic.state.mn.us/gc/stds/metadata.htm