USGS 1:100,000 Digital Line Graph Hydrography Layer, customized for Minnesota by LMIC and DNR

This page last updated: 04/26/2011
Metadata created using Minnesota Geographic Metadata Guidelines


Metadata Summary

Originator United States Geological Survey (USGS) - National Mapping Division
Abstract The DLG HYDROGRAPHY file is a GIS layer originally created by the United States Geological Survey to represent all surface hydrologic features appearing on the USGS 1:100,000 map sheet series. This current version was converted to ARC/INFO by the Land Management Information Center and edge-matched across map sheet boundaries. In addition, LMIC made some corrections to feature identification, and added state water identifiers to lakes, wetlands, and river features. DNR made further modifications to the files, verified lake feature identifiers, and created a state layer from the separate 100k data sets.

Although DNR Division of Lake numbers were added to the file, this coverage does NOT constitute an official 'Protected Waters Inventory' layer: the information is not complete.
Browse Graphic none available
Time Period of Content Date
Currentness Reference DLG data were automated from the most recent USGS sources available at the time. No specific study has been undertaken to determine the range of dates associated with the maps used to create the data set. Some representations extend back 20 years or more. The files were converted to Arc/INFO in 1989. Division of Waters Lake Number tagging was done using the official DNR set of Protected Waters Inventory county maps. CSAW river numbering was done using the 1:24,000 USGS base map series stored at DNR which have the watershed boundaries delineated and numbered on mylar overlays, and the CSAW number for each minor watershed identified.
Access Constraints None
Use Constraints Use should be consistent with the source and scale of the originating maps. Division of Waters Lake numbers were attached to lake and wetland polygons where identifiable, using the DNR Protected Waters Inventory County Map Series as a guide. However, since all lake and wetland polygons on the DNR maps were not on the 1:100,000 DLG data set, this does NOT constitute a complete, official, Protected Waters Inventory layer.

Redistribution Conditions: In obtaining these data from LMIC, it is understood that you and/or your organization have the right to use them for any internal purpose. If you modify them, you should document those changes in a metadata record that should accompany all redistributed data. If you transmit or provide these data in any form to another user, the data MUST be accompanied by a copy of this disclaimer and all documentation provided with the original data set including the full metadata record.
Distributor Organization Minnesota Land Management Information Center (LMIC)
Ordering Instructions Clicking on the 'Online Linkage' enables the download of a self-extracting 'ZIP' file (with an .exe suffix) to the user machine.

The .exe file contains the following:
- Arc Export file (.e00) of the coverage
- Associated data tables or code files (.txt or .e00 format)
- Metadata (.htm) file for the dataset
- Readmeta.txt - a file describing metadata formats
- NOTICE.RTF and NOTICE.TXT, the LMIC data liability notice.

After downloading this self-extracting 'zip' file, simply execute (run) the file. For example, you can double click it from Windows Explorer or File Manager. Doing this will automatically extract the files described above.
Online Linkage Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata.

Full Metadata

USGS 1:100,000 Digital Line Graph Hydrography Layer, customized for Minnesota by LMIC and DNR

Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information

 
Section 1 Identification Information   Top of page
Originator United States Geological Survey (USGS) - National Mapping Division
Title USGS 1:100,000 Digital Line Graph Hydrography Layer, customized for Minnesota by LMIC and DNR
Abstract The DLG HYDROGRAPHY file is a GIS layer originally created by the United States Geological Survey to represent all surface hydrologic features appearing on the USGS 1:100,000 map sheet series. This current version was converted to ARC/INFO by the Land Management Information Center and edge-matched across map sheet boundaries. In addition, LMIC made some corrections to feature identification, and added state water identifiers to lakes, wetlands, and river features. DNR made further modifications to the files, verified lake feature identifiers, and created a state layer from the separate 100k data sets.

Although DNR Division of Lake numbers were added to the file, this coverage does NOT constitute an official 'Protected Waters Inventory' layer: the information is not complete.
Purpose The National Cartographic Information Center (NCIC) distributes digital cartographic data files produced by the USGS as part of the National Mapping Program. The 1:100,00 Digital Line Graph digital files were created as a digital data set associated with the USGS Topographic Map Series. The purpose was to provide complete national coverage, at 1:100,000 scale, for the production of cartographic products, and to support the analytical functions of GIS. All types of features represented on the Map Series are to be represented.

Enhancements made by LMIC were made in order to create a Surface Water GIS base layer which was edgematched and contained sufficient identifier information that it could be used to map information related to streams and lakes (such as lake water quality, lake levels, or wild and scenic rivers status). DNR has used the file for GIS applications and as a basis for WEB mapping functions.
Time Period of Content Date
Currentness Reference DLG data were automated from the most recent USGS sources available at the time. No specific study has been undertaken to determine the range of dates associated with the maps used to create the data set. Some representations extend back 20 years or more. The files were converted to Arc/INFO in 1989. Division of Waters Lake Number tagging was done using the official DNR set of Protected Waters Inventory county maps. CSAW river numbering was done using the 1:24,000 USGS base map series stored at DNR which have the watershed boundaries delineated and numbered on mylar overlays, and the CSAW number for each minor watershed identified.
Progress Complete
Maintenance and Update Frequency None Planned.
Spatial Extent of Data State of Minnesota
Bounding Coordinates -97.5
-89.0
49.5
43.0
Place Keywords Minnesota, Statewide
Theme Keywords inlandWaters, Hydrography, Surface Water, Hydrology, Lakes, Rivers, Streams, Wetlands, DNR Division of Waters Lake Numbers, CSAW Stream Numbers
Theme Keyword Thesaurus ISO 19115 Topic Category
Access Constraints None
Use Constraints Use should be consistent with the source and scale of the originating maps. Division of Waters Lake numbers were attached to lake and wetland polygons where identifiable, using the DNR Protected Waters Inventory County Map Series as a guide. However, since all lake and wetland polygons on the DNR maps were not on the 1:100,000 DLG data set, this does NOT constitute a complete, official, Protected Waters Inventory layer.

Redistribution Conditions: In obtaining these data from LMIC, it is understood that you and/or your organization have the right to use them for any internal purpose. If you modify them, you should document those changes in a metadata record that should accompany all redistributed data. If you transmit or provide these data in any form to another user, the data MUST be accompanied by a copy of this disclaimer and all documentation provided with the original data set including the full metadata record.
Contact Person Information Susanne Maeder, GIS Data Coordinator
Minnesota Land Management Information Center (LMIC)
300 Centennial Building; 658 Cedar Street
St. Paul, Minnesota 55155
Phone: 651.201.2488
FAX: 651.296.3698
E-mail: susanne.maeder@state.mn.us
Browse Graphic none available
Browse Graphic File Description
Associated Data Sets The Minnesota Department of Natural Resources offers the same dlg hydrography data set, broken into a streams layer and a lakes layer.
This is available at: http://deli.dnr.state.mn.us/metadata/full/dlgstln2.html and http://deli.dnr.state.mn.us/metadata/full/dlglkpy2.html

The DNR Division of Waters lakes list (data table) contains lake identifiers, lake name, area, and protected waters status for all lakes and wetlands enumerated as part of either the DNR Protected Waters Inventory or the 1967 Inventory of Minnesota Lakes (DNR Bulletin 25). This table is available for download. See http://www.lmic.state.mn.us/chouse/metadata/dowlakes.html

The CSAW (Common Stream and Watershed Numbering) data tables contain river names and associated watershed information and can be used to associate river names with the CSAW river number on this file.
These tables are available for download. See http://www.lmic.state.mn.us/chouse/metadata/csaw.html

 
Section 2 Data Quality Information Top of full metadata Top of page
Attribute Accuracy DLG source data has a 98.5 percent correct accuracy specification. No subsequent tests have been performed following ARC/INFO processing. Water body coding has demonstrated inconsistencies in the reservoir feature type, with some man-made waterbodies being classified as lakes. Stream coding for status of perennial or intermittent has been corrupted as the result of previous data processing errors, rendering this part of the stream classification as unreliable Although there were a couple of passes at adding and reviewing identifiers, the original USGS feature code (USCLASS), the DNR DOW Lake Number (DOWLKNUM), and the CSAW numbers and associated names should be reviewed for accuracy before final map presentation.
Logical Consistency Data are topologically correct using ARC/INFO 7.0.3. All polygons are closed and lines intersect where intended.
Completeness Data exist statewide. Lake data are consistently complete at a minimum feature size of approximately 5 acres, with mapping to the 2-acre level present in some areas. Some thematic information in the area and line feature classes are inconsistently mapped, and should not be considered complete information categories. These include the following feature types: rapids, gravel pits, canal locks or spillways, crevasses, navigable transportation. As already noted, the file does not constitute a complete 'Protected Waters Inventory' layer, as many lake or wetland polygons designated as protected waters in Minnesota are not represented on the GIS file.
Horizontal Positional Accuracy 51 meters
Lineage LMIC modifications to the files originally obtained from the United States Geological Survey include:
1) Conversion from Digital Line Graph format to ARC/INFO format;
2) Edge-matching of all 1:24,000 sheets which made up the 1:100,000 sheets;
3) Changing of arc directions so that all stream features flowed in a downstream direction;
4) Addition of the DNR Common Stream and Watershed Number (CSAW#) to major streams;
5) Addition of the DNR Division of Waters Lake Number to all lakes and wetlands on the file which were labeled as protected water features on the DNR Protected Waters Inventory county map series.


1. Original DLG file creation (United States Geological Survey).

Most DLG data is automated from the USGS 1:100,000 scale quadrangle series, although, in some cases, sets of USGS 7.5-minute (1:24,000 scale) were phot-reduced to a scale of 1:100,000 and physically merged into a single source manuscript matching the 1:100,000 map sheet. Each of these maps covers an area of 1 degree longitude by 1/2 degree latitude. USGS digital production relied on an automated scanning/vectorization process. To generalize to the 1:100,000 level, polygons smaller than a certain size and line features smaller than a certain length were dropped from the file. See also USGS metadata created specifically for this layer. Data was made available by USGS in Digital Line Graph format in 7.5-minute map tiles.

For more information on the creation of the original USGS data file, see: US GeoDATA: National Mapping Program Technical Instructions 'Digital Line Graphs from 1:100,000-Scale Maps' Data Users Guide 2 USGS/ National Mapping Division, Reston, VA 1989 See especially Appendix D: DLG Attribute Codes. 'MINOR CODE' corresponds to data field 'USCLASS', and 'DESCRIPTION' identifies the feature type.

2. Arc/INFO conversion and edgematching (Land Management Information Center, 1989-1990)

LMIC converted the USGS data from DLG to ARC/INFO format, and with the help of cooperators, edgematched the original 7.5-minute file blocks into 30 by 60 degree blocks. The edge-match process followed the convention of working in a checkerboard fashion, holding the linework of every other quad within the 30 by 60-minute block stable, and adjusting the linework on alternate quadrangles to the stable linework.

3. Tagging with DNR Division of Waters lake numbers (Land Management Information Center, 1992-1993).

LMIC staff went through the files, one 100k sheet at a time, and added lake, wetland, and stream identifiers in two passes. A series of Arc Macro Language (AML) programs were written to support this effort. In the first pass, DNR Division of Waters lake numbers were added to the file as an attribute. For each 100k map sheet, the polygons features identified by USGS as lakes or wetlands were visually compared with a set of DNR Protected Waters Inventory (PWI) maps, and the lake number on the map was attached to the appropriate polygons which made up the same lake or wetland on the digital file. In some portions of the state - the Arrowhead region and most of the Minnesota River Basin, the project was able to make use of a digital, tagged 1:24,000 lake polygon files. In these areas, this information was used as a background and the lake identifier was carried forward. If it was unclear from the PWI maps how the lakes were numbered (this was often the case in areas where there were many lakes and where the shape of the lake on the PWI map did not match exactly the shape of the lake on the GIS file), the USGS 1:24,000 topographic maps and the DNR lake number table were used as additional reference material.

4. River Numbering Processing (Land Management Information Center, 1992-93)

A second pass through the data was used to identify multiple sets of arcs which made up a single river trace, and to assign those river traces with a river ID, the DNR Common Stream and Watershed (CSAW) Number for the river. At the same time, river arcs were flipped,' if necessary, so that the direction of every river arc was in the downstream direction. For a river numbering reference, staff used the DNR Division of Waters set of USGS 7.5-minute basemaps, overlayed with a mylar overlay on which DNR delineated and numbered major/minor watersheds and, in addition, recorded the CSAW stream number and basin number for the major river flowing through the minor watershed. Thus, CSAW stream numbers were assigned for the major stream in each of the state's 5600 minor watersheds. Other, auxiliary streams in each minor watershed were not labeled on the DNR basemaps and, therefore, not labeled on the GIS file.

5. Further Processing (Minnesota Department of Natural Resources)

The data were then joined into a statewide coverage and the various quadrangle sheet, watershed, and county boundary features which had been overlayed with the hydrography data were removed. The resulting data set of whole stream and lake features were subjected to a non-rigorous visual quality control process for anomolous attribute code behaviour (e.g. large lakes coded as streams). Division of Waters (DOW) lake identifiers were transferred from the original source data, although only those numbers falling within a valid range were included with the data set. Numerous attribute fields were dropped from the polygon attribute table (.PAT) most of which were not applicable for the new version of the data. The data also underwent some additional validation efforts for Division of Waters (DOW) Lake Numbers. Those lakes managed specifically for fisheries were validated by Section of Fisheries staff. Those lakes that have been validated have been assigned a value of 1 in the DOW_VERIFY field.
Source Scale Denominator 100000
 
Section 3 Spatial Data Organization Information Top of full metadata Top of page
Native Data Set Environment Arc/Info 7.x
Geographic Reference for Tabular Data
Spatial Object Type Vector
Vendor Specific Object Types Polygon, Arc
Tiling Scheme State cover
 
Section 4 Spatial Reference Information Top of full metadata Top of page
Horizontal Coordinate Scheme UTM
Ellipsoid GRS80
Horizontal Datum NAD83
Horizontal Units Meters
Distance Resolution
UTM Zone Number 15
 
Section 5 Entity and Attribute Information Top of full metadata Top of page
Entity and Attribute Overview USCLASS water feature codes represented in the DLG-HYDRO .AAT or .PAT files include the following: 101 Reservoir, 105 Inundation Area, 106 Fish Hatchery, 107 Industrial Water Impoundment, 109 Sewage Treatment Area, 110 Tailings Pond, 111 Marsh, Wetland, Swamp, Bog, 116 Bay, 200 Shoreline, 201 Manmade Shoreline, 202 Closure Line, 203 Indefinite Limit, 204 Apparent Limit, 400 Rapids, 401 Falls, 402 Gravel Pit or Quarry filled with Water, 406 Dam or Weir, 407 Canal Lock or Sluice Gate, 411 Crevasse, 412 Stream, 414 Ditch or Canal, 415 Aqueduct, 419 Channel in Water Area, 421 Lake or Pond, 605 Right Bank, 606 Left Bank, 610 Intermittent, 612 Submerged or sunken, 616 Navigable,

By far, the most common USCLASS designations are 200, 201, 204, 412, 414, 605, 606 or 610 for arcs and 101, 111, 412, or 421 for polygons. Most of the other minor water body types are inconsistently mapped and therefore do not constitute reliable attribute information.

For information on the Common Stream and Watershed Numbering System, see: SIDRS Report 7001. Program Overview. The Development of a Statewide Hydrologic Reference system. DNR Office of Planning 1981. SIDRS Report 7002. The Common Stream and Watershed Numbering System. DNR Office of Planning 1981.

The CSAW files, which can be used to attach a name to the river number, and the DNR Division of Waters lake list, which can be used to attach lake name, lake alternate name, and protected waters status, and shoreland zoning classification information to the coverage, are available as separate tables. (See 'Associated Data Sets' for citation).
Entity and Attribute Detailed Citation The digital line graph hydrology file is stored as an Arc/INFO NET coverage.

DLGHYNE2.AAT contains the following data fields:
COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 8 18 F 5
25 DLGHYNE2# 4 5 B -
29 DLGHYNE2-ID 4 5 B -
33 USCLASS 6 6 I -
39 FLOW 1 1 I -
40 S1 6 6 N 1
46 S2 6 6 N 1
52 S3 6 6 N 1
58 S4 6 6 N 1
64 S5 6 6 N 1
70 S6 6 6 N 1
76 S7 6 6 N 1
82 S8 6 6 N 1
88 S9 6 6 N 1
94 S10 6 6 N 1
100 ZONE 5 5 C -
105 TROUT 2 2 C -
107 WSR 1 1 C -
108 PWI 1 1 C -
** REDEFINED ITEMS **
40 STREAM-# 60 60 C -
33 SPLIT_ITEM

DATA FIELD DEFINITIONS:

FNODE# -- standard ARC field - from node number
TNODE# -- standard ARC field - to node number
LPOLY# -- standard ARC field - left polygon number
RPLOY# -- standard ARC field - right polygon number
LENGTH -- standard ARC field - length of arc in cover units
DLGHYNE2# -- standard ARC field - internal identifier for the arc
DLGHYNE2-ID -- standard arc field - arc identifier
USCLASS -- field describing feature type - from USGS 'minor' code for the feature.)
FLOW -- field originally describing flow condition. No longer used.
S1 -- First stream digit in the DNR CSAW numbering scheme
S2 -- Second stream digit in CSAW
S3 - S10 -- Third through tenth stream digits in CSAW, repectively.
ZONE -- placeholder for DNR Shoreland Zoning Classification- currently blank
TROUT -- placeholder for DNR trout stream designation - currently blank
WSR -- placeholder for DNR Wild and Scenic Rivers designation - currently blank
PWI placeholder for DNR Protected Waters Inventory status of river segment - currently blank

REDEFINED DATA FIELDS:

STREAM-# -- the full DNR CSAW number, created by concatenating all 10 stream digits, S1 through s10)
UNSPLIT_ITEM

DLGHYNE2.PAT contains the following data fields:
COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME
1 AREA 8 18 F 5
9 PERIMETER 8 18 F 5
17 DLGHYNE2# 4 5 B -
21 DLGHYNE2-ID 4 5 B -
25 USCLASS 6 6 I -
31 DOWLKNUM 8 8 C -
39 DOW_VERIF 1 1 I -
40 LAKE_NAME 25 25 C -
65 LAKE_CLASS 2 2 I -

DATA FIELD DEFINITIONS

AREA -- standard arc field - area of polygon, in map coverage units, squared
PERIMETER -- standard arc field - perimeter of polygon, in map coverage units
DLGHYNE2# -- standard arc field - internal polygon number
DLGHYNE2-ID -- standard arc field - polygon identifier
USCLASS -- field describing feature type - from USGS 'minor' code for the feature
DOWLKNUM -- the DNR Division of Waters Lake Number (DOW number) for the water feature. Water features with a DOW number are lakes or wetlands. The DOW number is a 8-character field, where the first 2 characters represent the county number and the next 4 characters represent the unique lake or wetland number within the county, and the last 2 characters indicate a sub-basin. Most lakes are not sub-divided any further, and their SUBBASIN code is '00'.
DOW_VERIF --A flag to identify records whose DOW numbers have been validated. At the time of this metadata development effort, only those lakes that are managed for gamefish by the section of Fisheries has been validated. There are a total of 24,568 lake or pond polygon records in this layer, of which 4067 have been validated. In general, the lakes which have been validated are the largest and most intensely utilized and managed lakes in the state.
LAKE_NAME -- Lake name as reflected in DNR Fisheries lake database. Names are only present for those lakes which are actively monitored and managed by the Section of Fisheries(approximately 3600 features)
LAKE_CLASS-- This field holds Section of Fisheries Lake ClasS information. The Section of Fisheries has developed an ecological classification system for Minnesota's lakes based on the analysis of historical survey records. Using data from approximately 8,000 surveys from more than 3,500 lakes, fisheries research biologist Denny Schupp, developed mathematical models that classified lakes into 43 distinct groups. Variables used to develop the models include: lake area, maximum depth, percent littoral area total alkalinity, secchi disc transparency, shoreline development factor, morphoedaphic index, and Carlson's Trophic status index. Characteristic fish communities were then described for each lake class by analyzing historical gill net and trap net data. Fisheries managers use this information to evaluate fish population status, determine the effectiveness of various management actions, and to establish realistic fisheries management goals and objectives. The methodology and documentation of this classification system is found in An Ecological Classification of Minnesota Lakes With Associated Fish Communities, by Dennis H. Schupp. 1992. Investigational Report No. 417, Minnesota Department of Natural Resources, Section of Fisheries, St. Paul, MN.
 
Section 6 Distribution Information Top of full metadata Top of page
Publisher Minnesota Department of Natural Resources
Publication Date 1997
Contact Person Information Susanne Maeder
GIS Data Coordinator
Minnesota Land Management Information Center (LMIC)
300 Centennial Building; 658 Cedar Street
St. Paul, Minnesota 55155
Phone: 651.201.2488
FAX: 651.296.3698
E-mail: clearing.house@state.mn.us
Distributor's Data Set Identifier dlghyne2
Distribution Liability Limitations: Although extensive effort has been made to produce error free and complete data, all geographic information has limitations due to the scale, resolution, date and interpretation of the original source materials. You should consult available data documentation (metadata) for these particular data to determine their limitations and the precision to which they depict distance, direction, location or other geographic characteristics. These data may be subject to periodic change without prior notification.

No Warranty: These data are provided as is, without any warranty whatsoever, including but not limited to any warranty as to their performance, merchantability, or fitness for any particular purpose.

Liability: The entire risk as to the results of the use of these data is assumed by the user. LMIC is not responsible for any interpretation or conclusions based on these data made by those who acquire or use it. LMIC shall not be liable for any direct, indirect, special, incidental, compensatory or consequential damages or third party claims resulting from the use of these data, even if LMIC has been advised of the possibility of such potential loss or damage. In States that do not allow the exclusion or limitation of incidental or consequential damages, you may not use these data.

Data Delivered on Electronic Media: If these data have been requested from LMIC on magnetic media, CD-ROM or any other physical media, LMIC will deliver this product in the computer-readable format agreed upon with the requestor. LMIC will re-issue these data if they are determined unreadable by correctly adjusted computer input devices, or when the medium is delivered in a damaged condition. Requests for re-issue of this digital data product must be made within 30 days of the date shipped from LMIC.
Transfer Format Name Arc/INFO Export
Transfer Format Version Number 7.1.1
Transfer Size Arc export file is 255 MB; self-extracting zip file is 72.5 MB; 95.2 MB as statewide shapefile
Ordering Instructions Clicking on the 'Online Linkage' enables the download of a self-extracting 'ZIP' file (with an .exe suffix) to the user machine.

The .exe file contains the following:
- Arc Export file (.e00) of the coverage
- Associated data tables or code files (.txt or .e00 format)
- Metadata (.htm) file for the dataset
- Readmeta.txt - a file describing metadata formats
- NOTICE.RTF and NOTICE.TXT, the LMIC data liability notice.

After downloading this self-extracting 'zip' file, simply execute (run) the file. For example, you can double click it from Windows Explorer or File Manager. Doing this will automatically extract the files described above.
Online Linkage Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above.
 
Section 7 Metadata Reference Information Top of full metadata Top of page
Metadata Date 04/26/2011
Contact Person Information Susanne Maeder, GIS Data Coordinator
Minnesota Land Management Information Center (LMIC)
300 Centennial Building; 658 Cedar Street
St. Paul, Minnesota 55155
Phone: 651.201.2488
FAX: 651.296.3698
E-mail: clearing.house@state.mn.us
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


This page last updated: 04/26/2011