Metadata for Montana Statewide Irrigation Dataset Metadata for Montana Statewide Irrigation Dataset

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Identification Information:

Citation:

Originator: Montana Department of Natural Resources and Conservation

Publication date: 04/07/2024

Title: Montana Statewide Irrigation Dataset

Publisher: Montana Department of Natural Resources and Conservation

Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Shapefiles/statewide_irrigation_dataset.zip

Larger Work Citation:

Originator: Montana Department of Natural Resources and Conservation
Publication date: 04/08/2024
Title: Montana Statewide Irrigation Dataset, Irrigated Lands
Online linkage: https://mslservices.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={f33bc611-8d4e-4d92-ae99-49762dec888b}

Abstract:

The Montana Statewide Irrigation Dataset (SID) is a GIS polygon vector representation of Montana's irrigation-equipped agricultural fields. It consists of over 50,000 agricultural fields that were aggregated from various existing data sources and manually digitized. The majority of the data is derived from Montana Department of Revenue's 'Final Land Unit' data, which was derived itself in large part from USDA Farm Service Agency 'Common Land Unit' parcel data. The data has been edited to meet three geometric and data specifications: 1) the fields do not overlap; 2) each field is represented by a single object; 3) each field is attributed with data describing the editor's judgement of the irrigation type from high- photography, and a confidence score (1 - 3) in the estimate of the likelihood of active irrigation and irrigation type. Field boundary delineation and irrigation type attribution was based on 0.6 m resolution USDA National Agricultural Imagery Program imagery captured in 2019 and 2020, and from Landsat and Sentinel satellite-derived Normalized Density Vegetation Index imagery from 2018-2021. The fields represent the an estimate of irrigated agriculture in 2020 in Montana.

The data is not absolutely comprehensive; it covers about 2.15 million acres of Montana's irrigated agriculture. A previous estimate of total area by the 2015 Montana State Water Plan indicate about 2.5 million acres were irrigated, while estimates of irrigation on revenue-generating farms by the USDA National Agricultural Statistics Service in 2017 and 2022 placed the irrigated area at 2.06 million acres and 1.72 million acres, respectively. Careful inspection of the data overlain on high-resolution imagery reveal that numerous small fields of ambiguous irrigation status are excluded from the dataset and suggest this dataset is indeed comprehensive of large irrigated fields. DNRC hopes to examine omitted, potentially irrigated lands in future versions of the SID.

View Mapping Irrigated Agriculture in Montana Final Technical Completion Report: https://docs.msl.mt.gov/geoinfo/WIS/statewide_irrigated_lands_metadata_report/
IrrLands_FinalTechnicalReport.pdf

Purpose:

GIS polygon vector representation of Montana's irrigation-equipped agricultural fields. The fields represent the an estimate of irrigated agriculture in 2020 in Montana.

Time period of content:

Beginning date: 01/01/2018
Ending date: 01/01/2021
Currentness reference: State of Montana

Status:

Progress: Complete
Maintenance and update frequency: unknown

Access constraints: None

Use constraints:

The Montana State Library provides this product/service on behalf of the Montana Department of Natural Resources and Conservation for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library 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. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Point of contact:

David Ketchum
Montana Department of Natural Resources and Conservation
, Montana

Data set credit:

Montana Department of Natural Resources and Conservation, University of Montana Climate Office

Data Quality Information:

Horizontal Positional Accuracy Report:: Polygons were generally mapped at 1:12,000 scale map and expected to have a horizontal accuracy of 5 to 10 meters. NAIP was used as the mapping base layer and has a horizontal accuracy of plus/minus 5 meters

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: GT-polygon composed of chains

SDTS object count: 1

Spatial Reference Information:

Horizontal coordinate system definition:

Map projection:

Map projection name: NAD 1983 2011 StatePlane Montana FIPS 2500
Lambert conformal conic:

Planar distance units: meter

Geodetic model:

Horizontal datum name: D NAD 1983 2011
Ellipsoid name: GRS 1980
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257222101

Entity and Attribute Information:

Entity type label: statewide_irrigation_dataset_15FEB2024

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: SOURCECODE

Attribute label: COUNTY_NO

Attribute label: COUNTYNAME

Attribute label: ITYPE

Attribute definition:: 'ITYPE' is the irrigation system type: P = center pivot, S = sprinkler, F = flood; UNK = unclassified

Attribute label: USAGE

Attribute definition:: Highest confidence, high usage; Medium confidence, medium usage; Low confidence, low usage

Attribute label: MAPPEDBY

Attribute definition:: Mapped by refers to the original source of the data. Data gathered from other data sources, such as the DOR Final Land Unit, or mapped by interns. For more information see the Technical Report: https://docs.msl.mt.gov/geoinfo/WIS/statewide_irrigated_lands_metadata_report/IrrLands_FinalTechnicalReport.pdf

Distribution Information:

Distributor:

Montana Department of Natural Resources and Conservation
E-Mail: david.ketchum@mt.gov

Resource description: Downloadable Data

Distribution liability:

Standard order process:

Digital form:

Metadata Reference Information:

Metadata date: 04/08/2024

Metadata contact:

Montana Department of Natural Resources and Conservation
, Montana

Metadata use constraints:

The Montana State Library provides this product/service on behalf of the Montana Department of Natural Resourcs and Conservation for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library 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. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.