Metadata for Montana Waterbody Access (2013 - 2019) Metadata for Montana Waterbody Access (2013 - 2019)

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Identification Information:

Citation:

Originator: Montana Natural Heritage Program
Publication date: 02/24/2021
Title: Montana Waterbody Access (2013 - 2019)
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Geodatabases/MT_Waterbody_Access.zip

Abstract:

The Montana Waterbody Access dataset represents a snapshot of the probable presence of waterbody access structures and points. These data were visually surveyed from natural color digital aerial imagery collected during the summers of 2013, 2015, and 2017 by the National Agricultural Imagery Program (NAIP). In cases with unclear, shadowed, or ambiguous NAIP imagery, Google Earth imagery was consulted (generally from the summers of 2013-2016). Features were searched for at a scale of 1:4,000 - 1:5,000 and digitized at a scale potentially as fine as 1:2000. The following shoreline features may have been mapped: docks, ramps, marinas (extensive dock structures with 5 or more slips) and other access points. If a feature was present in any year in the imagery above, it was digitized. The National Hydrography Dataset (NHD) was used to identify waterbodies. The shorelines of lake and reservoirs with surface areas greater than to 0.133 square kilometers (~1/20th square mile) were searched, resulting in over 1200 waterbodies surveyed (see lakeres_mapped4access layer). Additional searches were conducted along some major slow-flowing rivers that could potentially support docks (see rivers_mapped4access). Current (2019) Fishing Access Sites (FAS) were also reviewed and features mapped.

Purpose:

The Montana Waterbody Access dataset contains data for docks, ramps, marinas, and general access points on and around Montana’s largest lakes, reservoirs and select major rivers. These data were developed to assist with planning and response efforts related to Aquatic Invasive Species.

Time period of content:

Beginning date: 01/01/2013
Ending date: 12/31/2019
Currentness reference: Ground Condition

Status:

Progress: Complete
Maintenance and update frequency: None planned

Access constraints: None

Use constraints:

Mapped features, whether noted as public, commercial, or otherwise, do not necessarily imply public access.

The Montana Natural Heritage Program (MTNHP) provides this product/service for informational purposes only. Users must assume responsibility to determine the usability of this data for their purposes. MTNHP provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall MTNHP be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. MTNHP reserves the right to change or revise published data and/or services at any time.

Point of contact:

Montana Natural Heritage Program
P.O. Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5363
E-Mail: mtnhp@mt.gov

Spatial Data Organization Information:

Spatial Reference Information:

Horizontal coordinate system definition:

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

Entity and Attribute Information:

Entity type label: access_points

Entity type definition: Points of potential access to waterbodies

Attribute label: Type

Attribute definition:: Generalized type of access point; may be inferred from surrounding land ownership

Entity type label: docks

Entity type definition: Likely docks

Attribute label: Type

Attribute definition:: Generalized type of dock (ownership); may be inferred from land ownership

Entity type label: ramps

Entity type definition: Likely ramps

Attribute label: Type

Attribute definition:: Generalized type of ramp; may be inferred from land ownership

Attribute label: Surface

Attribute definition:: Observed, probable surface of ramp; based on aerial imagery (may be incorrect)

Entity type label: marinas

Entity type definition: Marinas (extensive dock structures with 5 or more slips)

Attribute label: Type

Attribute definition:: Generalized type of marina; may be inferred from land ownership

Entity type label: lakeres_mapped4access

Entity type definition: These are the lakes and reservoirs that were searched

Entity type label: rivers_mapped4access

Entity type definition: These are the river reaches that were searched

Distribution Information:

Distributor:

Montana Natural Heritage Program
P.O. Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5363
E-Mail: mtnhp@mt.gov

Resource description: Downloadable Data

Distribution liability: See access and use constraints information.

Metadata Reference Information:

Metadata date: 02/24/2021

Metadata contact:

Montana Natural Heritage Program
P.O. Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5363
E-Mail: mtnhp@mt.gov