Elevation of marsh units in Jamaica Bay to western Great South Bay salt marsh complex, New York

Metadata also available as - [Questions & Answers] - [Parseable text] - [XML]

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Robert Welk
Originator: Zafer Defne
Originator: Neil Ganju
Publication_Date: 2019
Title:

Elevation of marsh units in Jamaica Bay to western Great South Bay salt marsh complex, New York

Edition: 1.0
Geospatial_Data_Presentation_Form: Vector Digital dataset (Polygon)
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9GAGLXB

Publication_Information:

Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: https://doi.org/10.5066/P9GAGLXB
Larger_Work_Citation:

Citation_Information:

Originator: Robert Welk
Originator: Zafer Defne
Originator: Neil Ganju
Publication_Date: 2019
Title:

Coastal wetlands from Jamaica Bay to western Great South Bay, New York

Edition: 1.0
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9GAGLXB

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested citation: Welk, R., Defne, Z., and Ganju, N.K., 2019, Coastal wetlands from Jamaica Bay to western Great South Bay, New York: U.S. Geological Survey data release, https://doi.org/10.5066/P9GAGLXB.

Online_Linkage: https://doi.org/10.5066/P9GAGLXB
Online_Linkage:

https://www.sciencebase.gov/catalog/item/5cfe96fde4b0156ea5644fc5

Description:

Abstract:

This data release contains coastal wetland synthesis products for the geographic region from Jamaica Bay to western Great South Bay, located in southeastern New York State. Metrics for resiliency, including unvegetated to vegetated ratio (UVVR), marsh elevation, and mean tidal range, are calculated for smaller units delineated from a Digital Elevation Model, providing the spatial variability of physical factors that influence wetland health. Through scientific efforts initiated with the Hurricane Sandy Science Plan, the U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands with the intent of providing Federal, State, and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, the response and resilience of coastal wetlands to physical factors need to be assessed in terms of the ensuing change to their vulnerability and ecosystem services.

Purpose:

The purpose of this shapefile is to calculate mean elevation for each marsh unit and its vegetated component. Analysis of marsh elevation is part of a comprehensive assessment to identify the factors and their weights in determining the vulnerability and resiliency of salt marshes. Elevation distribution in the Jamaica Bay to western Great South Bay salt marsh complex is given in terms of mean elevation of conceptual marsh units. The elevation data is based on the 1-meter resolution National Elevation Database (NED).

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2019

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -73.939947
East_Bounding_Coordinate: -73.416415
North_Bounding_Coordinate: 40.666277
South_Bounding_Coordinate: 40.545976

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5cfe97f9e4b0156ea5644fd1

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geospatial datasets
Theme_Keyword: wetland ecosystems
Theme_Keyword: wetland functions
Theme_Keyword: coastal ecosystems
Theme_Keyword: coastal processes

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: salt marsh
Theme_Keyword: vegetation
Theme_Keyword: marsh health
Theme_Keyword: estuary
Theme_Keyword: Long-Term Ecological Research
Theme_Keyword: LTER

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: inlandWaters
Theme_Keyword: environment
Theme_Keyword: elevation

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Atlantic Ocean
Place_Keyword: United States
Place_Keyword: New York
Place_Keyword: Queens County
Place_Keyword: Nassau County
Place_Keyword: Jamaica Bay
Place_Keyword: South Oyster Bay

Access_Constraints: None
Use_Constraints:

The mean elevation for each marsh unit is defined for scientific research purposes and should not be used as a sole source of reference for any regulations and policy making. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the source of this information.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Robert Welk

Contact_Position: Hydrologic Technician
Contact_Address:

Address_Type: mailing and physical address
Address: 2045 NY 112
City: Coram
State_or_Province: NY
Postal_Code: 11727

Contact_Voice_Telephone: 631-736-0783 x141
Contact_Electronic_Mail_Address: rwelk@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/5cfe97f9e4b0156ea5644fd1?name=elev.png

Browse_Graphic_File_Description:

Graphic that shows elevation of conceptual marsh units of Jamaica Bay to western Great South Bay salt marsh complex.

Browse_Graphic_File_Type: PNG

Native_Data_Set_Environment:

Environment as of Metadata Creation: Microsoft [Unknown] Version 6.2 (Build 9200); Esri ArcGIS 10.6.1 (Build 9270) Service Pack N/A (Build N/A)

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Marsh units, water and land boundary inherit their accuracy from accuracy of the source data, Jamaica Bay marsh units, and vertical accuracy of the U.S. Geological Survey National Elevation Database (USGS NED) data with a publication date of 2015.

Logical_Consistency_Report:

Positive elevation indicates above sea level. Marsh units with extremely low elevation (smaller than 0.2 percentile value), with extremely high elevation (larger than 99.8 percentile value) or with areas less than 900 square meters were flagged.

Completeness_Report:

The results are specific to the marsh polygons definition within the boundaries of the Jamaica Bay to western Great South Bay salt marsh complex. A detailed on-the-ground analysis of a single site may result in a different interpretation of the wetland and marsh unit boundaries.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Horizontal accuracy is inherited from the source dataset that delineates the marsh units, and can be considered to be +/-6 meters.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Because the elevation values are averaged over delineated polygons, vertical accuracy depends on both the horizontal accuracy of NWI dataset and the vertical accuracy of source elevation data, NED. NED vertical elevation accuracy was 0.2 meters.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2015
Title: National Elevation Dataset
Geospatial_Data_Presentation_Form: Raster Digital dataset
Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Online_Linkage: https://nationalmap.gov/viewer.html

Type_of_Source_Media: Digital
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2015

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: NED
Source_Contribution:

Downloaded NED Digital Elevation Model from the National Map Projection was NAD 1983 UTM Zone 18N with the North American Vertical Datum of 1988 (NAVD 88). Download date was 2019/03/01.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2017
Title: NAIP Digital Ortho Photo Image
Geospatial_Data_Presentation_Form: Remote-sensing image
Publication_Information:

Publication_Place: Salt Lake City, Utah
Publisher: USDA-FSA-APFO Aerial Photography Field Office

Online_Linkage: https://earthexplorer.usgs.gov
Online_Linkage:

https://www.sciencebase.gov/catalog/item/51355312e4b0e1603e4fed62

Type_of_Source_Media: Digital
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2017

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: NAIP
Source_Contribution:

Downloaded NAIP 1-meter resolution imagery from the USGS Earth Explorer. Projection was WGS 1984 Web Mercator Auxiliary Sphere. Download date was 2019/03/01.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Fish and Wildlife Service
Publication_Date: 2017
Title: National Wetland Inventory New York Wetlands
Geospatial_Data_Presentation_Form: Vector Digital dataset (Polygon)
Publication_Information:

Publication_Place: Madison, WI
Publisher: U.S. Fish and Wildlife Service

Online_Linkage: https://www.fws.gov/wetlands/data/Data-Download.html

Type_of_Source_Media: Digital
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2017

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: NWI
Source_Contribution:

Downloaded wetlands data for the state of New York in Shapefile format from the NWI download page. Projection was NAD 1983 Albers. Download date was 2018/03/01.

Source_Information:

Source_Citation:

Citation_Information:

Originator:

New England Interstate Water Pollution Control Commission Prepared by Cameron Engineering and Associates, LLP

Publication_Date: 2015
Title: Long Island Tidal Wetlands Trends Analysis
Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
Online_Linkage: http://www.dec.ny.gov/lands/5113.html

Type_of_Source_Media: Digital
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2015

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: NYSDEC
Source_Contribution:

Wetland polygon shapefile prepared for Long Island Tidal Wetlands Trends Analysis. Data available by request. Data acquired 2019/05/01.

Process_Step:

Process_Description:

This process step and all subsequent process steps were performed by the same person, Robert Welk, in ArcMap (ver. 10.6.1) using tools from ArcToolbox, unless otherwise stated. For complex operations, names of specific tools used are given in CAPITAL letters (any critical parameters used are given in parentheses, separated by a semicolon, immediately after the tool name). The input and output file names are provided in [square brackets] when necessary. Units for length and area calculations are meters (m) and square meters (m2) unless otherwise stated.
a) Set the data frame coordinate system and projection to NAD 1983 UTM Zone 18N. Prepare elevation dataset to be clipped to the boundaries polygon. MOSAIC TO NEW RASTER(Pixel type= 32 bit float; Mosaic operator=Mean; Cellsize=1 m) all of the NED raster to a new raster dataset with 1 m resolution [elev_mosaic.tif].
b) Calculate values for each marsh unit. DISSOLVE(Input features=[CMU_JB]; Dissolve field=FID_CMU; Statistics field=ATOT_M2 and FLG with Statistics type= First) to dissolve the vegetated and unvegetated classes in each marsh unit. FLG flags anomalous marsh units based on absence of vegetation, elevation and surface area, and is set to (-1) no vegetated area; (-10) marsh unit elevation higher than the 99.8 percentile; (-100) marsh unit elevation less than 0.2 percentile; (-1000) marsh unit surface area less than 900 m2; and (0) no flag. Combination of negative values indicate combination of flags. For example, -1001 indicates no vegetated area and area less than 900 m2. PROJECT(Input coordinate system=WGS 1984 Web Mercator Auxiliary Sphere; Output coordinate system=NAD 1983 UTM Zone 18N; Geographic transformation=WGS 1984 (ITRF00) to NAD 1983) the feature dataset to obtain dissolved marsh units [mu_diss.shp].
c) Clip the raster with the polygon features by using EXTRACT BY MASK to obtain [elev_idw_mu.tif].
d) ZONAL STATISTICS AS TABLE(Feature Zone Data=[mu_diss.shp]; zone field=FID_CMU; Value Raster=[elev_idw_mu.tif]; Output Table=mu; Statistics type=MEAN)
e) ADD JOIN(Layer name=[mu_diss.shp]; Input join field=FID_CMU; Join Table=mu; Output join field=FID_CMU) to marsh units layer based on the "FID_CMU" field
f) Export dataset as a shapefile [mu_elev.shp] and keep the 'mu_MEAN" and "mu_ATOT_M2" fields from the join operation.
g) Calculate elevation of the vegetated areas only. SELECT BY ATTRIBUTES FROM [CMU_JB] where "CLASS"= 'vegetated'. SELECT BY ATTRIBUTES FROM [CMU_FIISp] where "CLASS"= 'vegetated'. Follow steps (c) to (f) using the selected features to export [veg_elev.shp].
h) JOIN FIELD(Input table=[mu_elev.shp]; Input join field=mu_FID_CMU; Join table=[veg_elev.shp]; Output join field=vg_FID_CMU; Join fields=vg_AVEG_M2,vg_ATOT_M2,vg_MEAN). Change the field names to VG_ELEV and MU_ELEV respectively for the fields with the mean elevation for the vegetated area only and mean elevation for the entire marsh unit. Set VG_ELEV to -9999 if there is no vegetated area in the marsh unit. Name AVEG_M2 and ATOT_M2 for vegetated and total area, respectively, and export to a new shapefile. [mu_elev_JB.shp].
i) SELECT BY ATTRIBUTES FROM [CMU_JB] where "CLASS"= 'vegetated', and join field "APGN_M2" from CMU_JB.shp on the feature dataset [mu_elev_JB.shp].
j) Rearrange field names and change the projection for better performance of web services with online base maps. PROJECT(Input coordinate system=NAD 1983 UTM Zone 18N; Output coordinate system=WGS 1984 Web Mercator Auxiliary Sphere; Geographic transformation=WGS 1984 (ITRF00) to NAD 1983) the feature dataset to obtain the final conceptual marsh units [mu_elev_JB.shp].

Source_Used_Citation_Abbreviation: elev_mosaic
Source_Used_Citation_Abbreviation: CMU_JB
Source_Used_Citation_Abbreviation: NAIP
Process_Date: 2019

Process_Step:

Process_Description:

Added keywords section with USGS persistent identifier as theme keyword.

Process_Date: 20200807
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 2420

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name:

WGS 1984 Web Mercator Auxiliary Sphere (ESRI Full Name: WGS_1984_Web_Mercator_Auxiliary_Sphere)

Mercator:

Standard_Parallel: 0.0
Longitude_of_Central_Meridian: 0.0
False_Easting: 0.0
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.6096
Ordinate_Resolution: 0.6096

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.001
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: mu_elev_JB
Entity_Type_Definition:

Attribute information associated with the mean elevation of the conceptual marsh units of Jamaica Bay salt marsh complex.

Entity_Type_Definition_Source: U.S. Geological Survey

Attribute:

Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain: Unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FID_CMU
Attribute_Definition:

Unique whole number that represents the identification number for each conceptual marsh units.

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 2784
Attribute_Units_of_Measure: none

Attribute:

Attribute_Label: ATOT_M2
Attribute_Definition: Total surface area of a marsh unit in square meters
Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 9.009921
Range_Domain_Maximum: 340675.207145
Attribute_Units_of_Measure: square meters

Attribute:

Attribute_Label: FLG
Attribute_Definition:

Marsh unit flag indicating anomalous marsh units based on absence of vegetation, elevation and surface area. FLG values indicate: (-1) no vegetated area; (-10) marsh unit elevation higher than the 99.8 percentile; (-100) marsh unit elevation less than 0.2 percentile; (-1000) marsh unit surface area less than 900 m2; and (0) no flag. Combination of negative values indicate combination of flags. For example, -1001 indicates no vegetated area and area less than 900 m2.

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -1101
Range_Domain_Maximum: 0
Attribute_Units_of_Measure: None

Attribute:

Attribute_Label: AVEG_M2
Attribute_Definition:

Surface area of vegetated part of a marsh unit in square meters. Value is set to -9999 if there is no vegetated area in the marsh unit.

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 330917.399946
Attribute_Units_of_Measure: square meters

Attribute:

Attribute_Label: MU_ELEV
Attribute_Definition:

Mean elevation of a marsh unit in meters. MU_ELEV is set to -999 if a no data cell value is provided in the input DEM to indicate the absence of real elevation values.

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -1.499505
Range_Domain_Maximum: 5.184272
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: VG_ELEV
Attribute_Definition:

Mean elevation of the vegetated area in a marsh unit in meters. VG_ELEV and MU_ELEV is set to -999 if a no data cell value is provided in the input DEM to indicate the absence of real evelation values.

Attribute_Definition_Source: USGS
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -1.499505
Range_Domain_Maximum: 5.149606
Attribute_Units_of_Measure: meters

Overview_Description:

Entity_and_Attribute_Overview:

In this dataset, mean elevation for each conceptual salt marsh unit in the Jamaica Bay to western Great South Bay salt marsh complex has been calculated based on the 1-meter resolution raster source dataset. Decimal values in the attribute table are a result of double precision calculations while significant digits are considered in defining the attribute measurement resolutions. Therefore, the smallest unit increment for area values and elevation is assumed to be 1 meter and 0.01, respectively.

Entity_and_Attribute_Detail_Citation: USGS

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey - ScienceBase

Contact_Address:

Address_Type: mailing and physical address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225

Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov

Resource_Description:

mu_elev_JB.shp (and other files associated with a shapefile), browse graphic (elev.png), and CSDGM metadata in XML format.

Distribution_Liability:

Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Not for navigational use.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: shapefile
Format_Version_Number: ArcGIS 10.6.1
Format_Information_Content:

This dataset contains a polygon shapefile and its components and metadata in xml format.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/5cfe97f9e4b0156ea5644fd1

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/5cfe97f9e4b0156ea5644fd1

Network_Resource_Name: https://doi.org/10.5066/P9GAGLXB

Access_Instructions:

The first link in network resources is to download data directly. The second link points to a landing page with metadata and data. The third link is to the main page of the data release.

Digital_Form:

Digital_Transfer_Information:

Format_Name: WMS

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalogMaps/mapping/ows/5cfe97f9e4b0156ea5644fd1?service=wms&request=getcapabilities&version=1.3.0

Access_Instructions:

The link in network resources points to the Web Mapping Services (WMS) end point.

Digital_Form:

Digital_Transfer_Information:

Format_Name: WFS

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalogMaps/mapping/ows/5cfe97f9e4b0156ea5644fd1?service=wfs&request=getcapabilities&version=1.0.0

Access_Instructions:

The link in network resources points to the Web Feature Service (WFS) end point.

Fees: None. No fees are applicable for obtaining the dataset.

Metadata_Reference_Information:

Metadata_Date: 20200807
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Northeast Region
Contact_Person: Robert J Welk

Contact_Position: Hydrologic Technician
Contact_Address:

Address_Type: mailing address
Address: 2045 Route 112
City: Coram
State_or_Province: NY
Postal_Code: 11727
Country: US

Contact_Voice_Telephone: 631-736-0783 x141
Contact_Electronic_Mail_Address: rwelk@usgs.gov

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9GAGLXB/mu_elev_JB_FGDC.html>