Lake Bathymetric Outlines, Contours, and DEM
Go to Section:- Overview
- Data Quality
- Data Organization
- Coordinate System
- Attributes
- Distribution - Get Data
- Metadata Reference
Section 1: Overview
Originator:DNR Division of Fish and Wildlife - Section of Fisheries
Title:
Lake Bathymetric Outlines, Contours, and DEM
Abstract:
This file geodatabase includes the following individual layers:
Lake Bathymetric Contours: Contours lines corresponding to lake bathymetry, digitized from existing lake contour maps produced by the DNR Ecological Services Lake Mapping Unit. Use in combination with other Lake Bathymetric GIS products. Classify and label contour lines with depth values. Convert to polygons and calculate lake surface area for each depth interval. Overlay onto bathymetric DEM shaded relief image.
Lake Bathymetric Digital Elevation Model (DEM): A digital elevation model (DEM) representing lake bathymetry. Cell size is most often 5m, although 10m cells were used for some lakes to reduce grid file size. This grid contains one attribute DEPTH that represents lake depth in (negative) feet. Use in combination with other Lake Bathymetric GIS products. Reclassify DEM based on various depth intervals. Calculate zonal and neighborhood statistics. Derive slope surface. Model depth data with other cell-based parameters (e.g., slope, vegetation, substrate, chemistry) to predict habitat suitability, functional niches, etc. (Note: These raster analyses require Spatial Analyst or Arc Grid.)
Lake Bathymetric Outline: Lake outline as digitized from 1991-92 aerial photography (1m DOQ's). Use in combination with other Lake Bathymetric GIS products. Overlay onto bathymetric contour lines and bathymetric DEM shaded relief image.
Lake Bathymetric Metadata: Metadata for the Lake Bathymetry layers. Each lake is represented by a polygon. The polygon attributes contain information about when the bathymetry fieldwork was completed. This layer can be used to query for bathymetry created on or between certain dates, or to ascertain what date a particular lake was investigated. The dates are in a text field. Date formats vary from record to record.
Purpose:
Contours: Limnological studies, experimental design, field studies, morphometric analyses.
DEM: Spatial modeling, slope determination, volumetric calculations, cell-based analyses.
Outline: Mapping, morphometric analyses (surface area, shoreline length).
Metadata: To support the use of the Lake Bathymetry layers with fieldwork dates.
Time Period of Content Date:
10/04/2021
Currentness Reference:
Time Period of Content date indicates the date which the user can be confident of accuracy and completeness of the dataset. Product dates depend on field work dates related to production of original lake contour maps. Zero depth values correspond to lake shoreline and islands as digitized from various aerial photography datasets. See Contact Information to obtain dates for individual products.
Progress:
In work
Maintenance and Update Frequency:
Unknown
Spatial Extent of Data:
Bounding Coordinates:
-96.719299
-89.998661
48.559229
43.460328
Place Keywords:
Minnesota
Theme Keywords:
hydrography, lakes, bathymetry, contours, depth, inlandWaters, surface area, shoreline
Theme Keyword Thesaurus:
Access Constraints:
None
Use Constraints:
None
Contact Person Information:
Andy Williquett,
GIS Data Contact
Minnesota DNR - Fisheries
500 Lafayette Rd
Saint Paul,
MN
55155
Phone: 651-259-5244
Email: andrew.williquett@state.mn.us
Associated Data Sets:
Section 2: Data Quality
Attribute Accuracy:
Logical Consistency:
Completeness:
This dataset is kept up to date with core layer dowlknum
Horizontal Positional Accuracy:
Lineage:
Section 3: Spatial Data Organization (not used in this metadata)
Section 4: Coordinate System
Horizontal Coordinate Scheme:
Universal Transverse Mercator
UTM Zone Number:
15
Horizontal Datum:
NAD83
Horizontal Units:
meters
Vertical Datum:
not applicable
Vertical Units:
Not Applicable
Depth Datum:
not applicable
Depth Units:
Not Applicable
Section 5: Attributes
Overview:
Detailed Citation:
Table Detail:
lake_bathymetry_mapdates - table indicating date DOW Lake Bathymetry Fieldwork was done
lake_bathymetric_metadata - Feature Class Attribute Table| Field Name | Valid Values | Definition | Definition Source |
|---|
| LAKE_NAME | - | Lake name per Division of Waters LKDBMAIN database | |
| DOWLKNUM | enumerated | Minnesota DNR Division of Waters Lake ID (sub-basin number;may end in '01, 02, etc.; refers to a single basin) | |
| 010001-879999 | The first two digits (01-87) of these composite codes denote which county the lake is in. | |
| LKNAME | - | Lake Name | |
| LOCATION | - | No Information Available | |
| TILE_NAME | - | DRS directory name ("d" + "dowlknum") | |
| MAPID | - | Lake contour map identification number | |
| FILENAME | - | Filename and path for scanned lake contour map (.tif images) stored at: Dnrco2\Shareco2\Faw\Lakemaps | |
| FLDW_END | - | End date of fieldwork for lake contour map | |
lake_bathymetric_contours| Field Name | Valid Values | Definition | Definition Source |
|---|
| DEPTH | enumerated | Depth | |
| 0 | Lake shoreline or island contour | |
| -1 to - 200 | Depth (in negative feet), usually a multiple of -5 | |
lake_bathymetric_elevation_model| Field Name | Valid Values | Definition | Definition Source |
|---|
| VALUE | - | Estimated depth (in negative feet) | |
lake_bathymetric_outline| Field Name | Valid Values | Definition | Definition Source |
|---|
| LAKE_NAME | - | Lake name per Division of Waters LKDBMAIN database | |
| CTY_NAME | - | County name | |
| DOWLKNUM | enumerated | Minnesota DNR Division of Waters Lake ID (sub-basin number;may end in '01, 02, etc.; refers to a single basin) | |
| 010001-879999 | The first two digits (01-87) of these composite codes denote which county the lake is in. | |
| ID | - | Unique ID for each basin having same DOW# | |
| AREA | - | Surface area of lake basin in square meters. | |
| ACRES | - | Surface area of lake basin in acres | |
| PERFEET | - | Perimeter of lake basin (shoreline) in feet | |
| PERIMETER | - | Perimeter of lake basin (shoreline) in meters | |
Section 6: Distribution
Publisher:
DNR Division of Fish and Wildlife - Section of Fisheries
Publication Date:
10/04/2021
Contact Person Information:
Zeb Thomas,
GIS Data Systems Coordinator
Minnesota DNR - GIS
500 Lafayette Rd
Saint Paul,
MN
55155
Phone: 651-259-5637
Email: zeb.thomas@state.mn.us
Distributor's Data Set Identifier:
water_lake_bathymetry
Ordering Instructions:
Please visit the download page for this dataset on the Minnesota Geospatial Commons website using the web link below (Online Linkage).
The DNR retains the copyright on these lake maps. To use any of this information commercially, you must fill out the following form and send it to MNIT@DNR FIsheries, 500 Lafayette Road, St. Paul, MN 55155-4025: http://files.dnr.state.mn.us/eco/lakemapping/agreement.pdf Online Linkage: I AGREE
to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.
Section 7: Metadata Reference
Metadata Date:
10/04/2021
Contact Person Information:
Andy Williquett,
GIS Data Contact
Minnesota DNR - Fisheries
500 Lafayette Rd
Saint Paul,
MN
55155
Phone: 651-259-5244
Email: andrew.williquett@state.mn.us
Metadata Standard Name:
Minnesota Geographic Metadata Guidelines
Metadata Standard Version:
1.2
