Metadata for Montana Lakes Bathymetry
Identification Information:
Citation:
Originator: Montana Fish, Wildlife and Parks
Publication date: 04/17/2008
Title: Montana Lakes Bathymetry
Online linkage: http://fwp.mt.gov/insidefwp/gis/shapefiles/bathymetry.zip

Abstract:
Lake Bathymetry is a line feature-based layer that includes bathymetric information for selected reservoirs, lakes, and ponds in Montana. The layer is based on information collected by Montana Fish, Wildlife & Parks over a period of time using a variety of different techniques and equipment including manual and electronic depth soundings, use of a GPS receiver, and digitizing previously published bathymetry maps. Data is compiled at a variety of scales and resolutions, depending on the collection method used for a particular waterbody. This data is planned to be regularly updated, however bathymetry information for addtional waterbodies may become available and included in this layer as new information is collected and compiled.
Purpose: Display of bathymetric (depth) contours.

Time period of content:
Calendar date: unknown
Currentness reference: publication date
Status:
Progress: In work
Maintenance and update frequency: Irregular
Access constraints: None
Use constraints:
Not appropriate for all uses. Users must assume responsibility to determine the usability of this data for their purposes. This data set is provided "as is" without warranty of any kind. Montana Fish, Wildlife & Parks (FWP) makes no representations or warranties whatsoever with respect to the accuracy or completeness of this data set and assumes no responsibility for the suitability of this data set for a particular purpose. FWP will not be liable for any damages incurred as a result of errors in this data set.
Point of contact:
Bill Daigle
Fisheries Information Specialist
Montana Fish, Wildlife and Parks
1420 East Sixth Ave
PO Box 200701
Helena, MT 59620-0701


Telephone: 406-444-3737
E-Mail: bdaigle@mt.gov


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Data Quality Information:


Lineage:
Source information:
Source scale denominator: 100,000; 24,000
Source contribution:
Data were derived from a variety of sources including:
1. CAD files that were georeferenced in ArcGIS (v 9.2) to the 2005 color aerial photography available through the Natural Resource Information System at http://nris.mt.gov/nsdi/orthophotos/naip_2005.asp and then converted to ESRI shapefile format.
2.. Pre-existing image files that were georeferenced from which lines were digitized on screen.
3. GPS depth and locations from which Triangulated Irregular Network (TIN) data were generated using ArcGIS.
4. Manual depth soundings.
Calendar date: 04/17/2008

Process step:
Compiled line work from all data sources listed under the Source Information section of this metadata.
Process date: 2008
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Spatial Data Organization Information:
Point and vector object information:
ESRI feature type: Polyline
ESRI feature count: 1325
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Spatial Reference Information:
Horizontal coordinate system definition:
Projected coordinate system name: NAD_1983_StatePlane_Montana_FIPS_2500
Grid coordinate system name: State Plane Coordinate System
SPCS zone identifier: 2500
Lambert conformal conic:
Standard parallel: 45.000000
Standard parallel: 49.000000
Longitude of central meridian: -109.500000
Latitude of projection origin: 44.250000
False easting: 600000.000000
False northing: 0.000000
Planar distance units: meters
Geodetic model:
Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137.000000
Denominator of flattening ratio: 298.257222
Altitude system definition:
Altitude resolution: 1.000000
Altitude encoding method:
Explicit elevation coordinate included with horizontal coordinates
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Entity and Attribute Information:
Entity type label: Bathymetry
Entity count: 1325

Attribute label: FID
Attribute definition: Internal feature number.
Attribute domain:
Sequential unique whole numbers that are automatically generated.

Attribute label: Shape
Attribute definition: Feature geometry.
Attribute domain: Coordinates defining the features.

Attribute label: LLID
Attribute definition: Lat-Long unique identifier for associated waterbody

Attribute label: Type
Attribute definition: Classifies feature as a shoreline, depth contour, or island.


Attribute
Value		 Definition of
Attribute Value
C Depth Contour
S Shoreline
I Island

Attribute label: LakeName
Attribute definition: Name of associated waterbody

Attribute label: CONTOUR
Attribute definition: Depth in feet

Attribute label: Source
Attribute definition: Original source of bathymetric contours
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Distribution Information:
Distributor:
Lydia Bailey
GIS Manager
Montana Fish, Wildlife & Parks
1420 East 6th Ave
Helena, MT 59620-0701


Telephone: 406-444-5365
E-Mail: lbailey@mt.gov


Resource description: Downloadable Data



Standard order process:
Digital form:
Format name: ESRI Shapefile
Transfer size: 20.720
megabytes
Online option:
http://fwp.mt.gov/insidefwp/gis/shapefiles/bathymetry.zip
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Metadata Reference Information:
Metadata date: 04/17/2008
Metadata contact:
Bill Daigle
Fisheries Information Specialist
Montana Fish, Wildlife & Parks
1420 East 6th Ave
PO Box 200701
Helena, MT 59620-0701


Telephone: 406-444-3737
E-Mail: bdaigle@mt.gov


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