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NOAA Office for Coastal Management (OCM) Lake Level Data: Mapping Confidence

Metadata Updated: November 15, 2023

These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer depicting potential water level increase and decrease in the coastal areas of the Great Lakes. The lakes included are: Erie, Huron, Michigan, Ontario, St. Clair, and Superior. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at lake level change and potential coastal impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses to help users examine multiple scenarios and prioritize actions. The Lake Level Viewer may be accessed at: https://coast.noaa.gov/llv

    These data depict the mapping confidence of the associated lake water level data for the water level amounts of -6 feet through +6 feet. The mapping 
    process is designed to give the most accurate picture of water extent possible, but inherent data errors introduce some uncertainty in the exact water 
    extents. The presentation of data confidence only represents the known error in the elevation data and not uncertainty associated with the natural evolution 
    of the coastal landforms (e.g., erosion or bluff failure) or future climate change impacts on lake levels.

    To access the associated data to be used with this data:
    NOAA Office for Coastal Management Lake Level Data: -6 Feet to +6 Feet Water Level Change data may be downloaded at:
    https://coast.noaa.gov/llv

    The NOAA Office for Coastal Management has tentatively adopted an 80 percent rank (as either inundated or not inundated) as the zone of relative confidence.
    The use of 80 percent has no special significance but is a commonly used rule of thumb measure to describe economic systems (Epstein and Axtell, 1996). The 
    method used to determine the confidence data only includes the uncertainty in the lidar derived elevation data (root mean square error, or RMSE). This 
    confidence data shows that the water level depicted in the -6 feet to +6 feet water level change data is not really a hard line, but rather a zone with greater 
    and lesser chances of being wet or dry. Areas that have a high level of confidence that they will be wet, means that there is an 80 percent or greater 
    likelihood that these areas will be covered with water. Conversely, there is a 20 percent or less likelihood that the area will be dry. Areas mapped as wet 
    (inundation) with a high confidence (or low uncertainty) are coded as 2. Areas that have a high level of confidence that they will be dry, means that there is 
    an 80 percent or greater likelihood that these areas will be dry. Conversely, there is a 20 percent or less likelihood that the area will be wet. Areas mapped 
    as dry (no inundation) with a high confidence (or low uncertainty) are coded as 0. Areas that have a low level of confidence, means that there is a 21 - 79 
    percent likelihood of wet or dry conditions. Note that 60 percent of the time, the land-water interface will be within this zone. Areas mapped as dry or wet 
    with a low confidence (or high uncertainty) are coded as 1.

    As with all remotely sensed data, all features should be verified with a site visit. The data are provided as is, without warranty to their performance,
    merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of these data is assumed by the user. 
    This data should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes. For a detailed description of the 
    confidence level and its computation, please see the Mapping Inundation Uncertainty document available at: 
    http://www.jcronline.org/doi/abs/10.2112/JCOASTRES-D-13-00118.1

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Date September 28, 2023
Metadata Created Date November 12, 2020
Metadata Updated Date November 15, 2023
Reference Date(s) 2017 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NOS OCM

Additional Metadata

Resource Type Dataset
Metadata Date September 28, 2023
Metadata Created Date November 12, 2020
Metadata Updated Date November 15, 2023
Reference Date(s) 2017 (publication)
Responsible Party NOAA Office for Coastal Management (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:48102
Access Constraints Cite As: Office for Coastal Management, [Date of Access]: NOAA Office for Coastal Management (OCM) Lake Level Data: Mapping Confidence [Data Date Range], https://www.fisheries.noaa.gov/inport/item/48102., Access Constraints: None | Use Constraints: These data illustrate the scale of potential water level decrease and increase, not the exact location, and do not account for erosion, subsidence, or future construction. Water level is shown as it would appear based on each lake's long term average water level over the period of record (excludes wind driven effects) with one foot increments of water level decrease or increase. These data should be used only as a screening-level tool for management decisions. As with all remotely sensed data, all features should be verified with a site visit. The data set is provided as is, without warranty to its performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of this data set is assumed by the user. This data set should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes. | Distribution Liability: These data illustrate the scale of potential water level decrease and increase, not the exact location, and do not account for erosion, subsidence, or future construction. Water level is shown as it would appear based on each lake's long term average water level over the period of record (excludes wind driven effects) with one foot increments of water level decrease or increase. These data should be used only as a screening-level tool for management decisions. As with all remotely sensed data, all features should be verified with a site visit. The data set is provided as is, without warranty to its performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of this data set is assumed by the user. This data set should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes. Any conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management (OCM) or its partners.
Bbox East Long -75.74
Bbox North Lat 49.61
Bbox South Lat 40.75
Bbox West Long -91.02
Coupled Resource
Frequency Of Update notPlanned
Harvest Object Id bc1010a4-3da7-4818-aae2-a792c30fb12f
Harvest Source Id c0121fd9-df15-4168-ac04-42f6e36a794d
Harvest Source Title NOS OCM
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Lineage
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-91.02, 40.75], [-75.74, 40.75], [-75.74, 49.61], [-91.02, 49.61], [-91.02, 40.75]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2017-05-01
Temporal Extent End 2017-06-01

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