Paul R. Nelson
Christopher G. Smith
20180525
GrandBay_2010_Shoreline.shp - Grand Bay, Mississippi/Alabama, Shoreline Data Derived from 2010 Aerial Imagery
vector digital data
U.S. Geological Survey Data Release
doi:10.5066/F7VT1R8Q
St. Petersburg, FL
U.S. Geological Survey
https://doi.org/10.5066/F7VT1R8Q
GrandBay_2010_Shoreline.zip features a digitized historical shoreline for the Grand Bay, Mississippi (MS) coastline (Pascagoula, MS to Point aux Pins, Alabama [AL]) derived from 2010 aerial imagery. Imagery of the Mississippi and Alabama coastlines was acquired from the National Agriculture Imagery Program (NAIP) and the city of Mobile, AL. Using ArcMap 10.3.1, the imagery was used to delineate and digitize the historical shoreline as either the Wet Dry Line (WDL) along sandy beaches or the vegetation edge along the marsh coastline at a scale of 1:1000. This shoreline was digitized for use in long-term shoreline and wetland analyses and physical change assessment.
Shoreline data are considered a crucial element in performing change analyses for erosion and accretion studies for tracking shoreline movement over time. Aerial imagery was used to digitize a set of polylines (feature) that reflect the Grand Bay shoreline position for the year 2010. The digitized feature captures the shape of the shoreline and provides an accurate and measurable position that can be used for various assessments. When this shoreline is combined with other historical shorelines from the area digitized in a similar manner, quantitative rates of change of shoreline position can be determined. Therefore these data can aid in developing an understanding of the temporal and spatial evolution of the coastline.
20100330
20100524
ground condition
As needed
-88.4961
-88.3027
30.4263
30.3183
USGS Metadata Identifier
USGS:8ca3c9bd-c2da-47c8-affe-28f205bbc95f
ISO 19115 Topic Category
geoscientificInformation
oceans
environment
elevation
boundaries
USGS Thesaurus
coastal processes
marine geology
geomorphology
remote sensing
unconsolidated deposits
aerial photography
digitization
None
shoreline data
shoreline map
Wet Dry Line
Geographic Names Information System
Grand Bay
Gulf of Mexico
United States of America
Alabama
Mississippi
None
The U.S. Geological Survey requests to be acknowledged as originator of the data in future products or derivative research. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution.
U.S. Geological Survey Coastal and Marine Science Center
Christopher G. Smith
Mailing
600 4th Street South
St. Petersburg
FL
33701
727-502-8035
727-502-8182
cgsmith@usgs.gov
Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1 (Build 4959) Service Pack N/A (Build N/A)
F.J. Anders
M.R. Byrnes
1991
Accuracy of shoreline change rates as determined from maps and aerial photographs
Shore and Beach
59(1):17-26
M. Crowell
S.P. Leatherman
M.K. Buckley
1991
Historical shoreline change: error analysis and mapping accuracy.
Journal of Coastal Research
7(3):839-852
R.A. Morton
T.L. Miller
L.J. Moore
2004
National assessment of shoreline change: Part 1: Historical shoreline changes and associated coastal land loss along the U.S. Gulf of Mexico
U.S. Geological Survey Open-File Report
2004-1043
St. Petersburg Coastal & Marine Science Center, St. Petersburg, FL
U.S. Geological Survey, Coastal and Marine Geology Program
https://pubs.er.usgs.gov/publication/ofr20041043
No formal attribute accuracy tests were conducted.
Digitized shorelines were checked to ensure they were one continuous line and were checked for dangles (or extra line segments), which were removed, when necessary. Larger estuarine channels were digitized, as needed, to ensure a complete shoreline for subsequent use within shoreline change analysis programs.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted.
Scott Kearney - City of Mobile, AL
Unpublished material
Orthophotography
raster digital data
2010 planimetric data can be ordered, in DVD format, from the City of Mobile Geographic Information Systems Department. Contact details are available at, http://maps.cityofmobile.org/GIS/gisdata.aspx.
12000
Digital and/or Hardcopy Resources
20100330
Ground Condition
AL_Orthophoto_2010
Imagery was used to delineate and digitize shoreline positions.
USDA/FSA - Aerial Photography Field Office
2010
USDA-FSA-APFO NAIP MrSID Mosaic
Photos
Salt Lake City, UT
USDA-FSA-APFO
12000
Digital and/or Hardcopy Resources
20100524
Ground Condition
MS_Orthophoto_2010
Imagery was used to delineate and digitize shoreline positions.
Imagery was acquired from multiple agencies as direct download or as hard copy. All data were provided orthorectified to provide the highest accuracy. Imagery was brought in ArcGIS 10.3.1 for overlay and further mapping.
AL_Orthophoto_2010
MS_Orthophoto_2010
20171119
GrandBay_2010_Shoreline.shp
Christopher G. Smith
U.S. Geological Survey
Mailing and Physical
600 4th Street South
St. Petersburg
Florida
33701
US
727-502-8035
727-502-8182
cgsmith@usgs.gov
Using ArcMap 10.3.1, aerial images were visually assessed for shoreline features at a reference scale of 1:1000. Shoreline features used, that is the shoreline mapped, were the Wet Dry Line (WDL) along sandy beaches or marsh-wetland edge along vegetated shorelines. The digitization was implemented using the ArcMap 10.3.1 Editor Toolbar part of the Esri ArcGIS software suite. Typology errors (a form of quality control for vector data) were assessed after the full shoreline was digitized using a cluster tolerance of 0.001 and typological rules to identify OVERLAPS, INTERSECTS, DANGLES, SELF-INTERSECTS, and SELF-OVERLAPS. All such features (except the start and end points at the most western and eastern extents of the area) were removed or corrected to ensure a single continuous feature.
AL_Orthophoto_2010
MS_Orthophoto_2010
20171119
GrandBay_2010_Shoreline.shp
Christopher G. Smith
U.S. Geological Survey
Mailing and Physical
600 4th Street South
St. Petersburg
Florida
33701
US
727-502-8035
727-502-8182
cgsmith@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20201013
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Vector
String
898
Universal Transverse Mercator
16
0.9996
-87.0
0.0
500000.0
0.0
coordinate pair
0.6096
0.6096
meters
North_American_Datum_1983
GRS_1980
6378137.0
298.257222101
Grandbay_2010_Shoreline
Esri polyline shapefile of shoreline features (WDL or vegetated edge) delineated from 2010 aerial imagery. A table containing attribute information associated with this dataset is included in GrandBay_2010_Shoreline.zip and described below.
USGS
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Coordinates defining the features.
DigScale
Reference scale used in ArcGIS 10.3.1 to identify and digitize the shoreline from aerial images.
USGS
1:1000
Ratio of image viewed in ArcGIS 10.3.1 relative to real world conditions.
USGS
VecLength
Linear distance, in meters, of the digital feature (line) representing the shoreline.
USGS
0.0240351824446
108319.648526
dImageDate
Date of image collection provided to USGS staff by the data source (see Source_Information of the Lineage section for additional details), stored in date format (M/DD/YYYY).
USGS
3/30/2010
Date of image collection provided by the City of Mobile (Alabama) GIS Department.
USGS
5/24/2010
Date of image collection provided with the USDA NAIP image mosaic.
USGS
sImageDate
Date of image collection provided by NAIP stored in string format ('MM/DD/YYYY hh:mm:ss AM/PM').
USGS
03/30/2010 12:00:00 AM
Date of image collection provided by City of Mobile (Alabama) GIS Department.
USGS
05/24/2010 12:00:00 AM
Date of image collection provided for USDA NAIP image mosaic.
USGS
ShoreType
Character string used to denote the shoreline type that was present as the shoreline was digitized.
USGS
Marsh
Term used to denote when the shoreline was manually identified as marsh or vegetated edge/boundary.
USGS
Sand
Term used to denote when the shoreline was identified as sandy shoreline.
USGS
DigFeat
Term used denoting digitized-shoreline feature given the reference scale.
USGS
Veg
Term used denoting that a vegetated-edge was digitized as the shoreline.
USGS
WDL
Term used denoting that the Wet Dry Line (WDL) on a sloping surface was digitized as the shoreline. There is no available information about beach slope.
USGS
ImageRes
Horizontal image resolution, in meters, provided by the NAIP.
USGS
0.5
1
ImagUnc
Horizontal uncertainty, in meters, of orthorectified image provided by the NAIP or City of Mobile.
USGS
1.2192
6
ShoreUnc
Horizontal uncertainty, in meters, of digitized shoreline feature based on image resolution and horizontal uncertainty. It was computed as the square root of the sum of squares of the image resolution, image uncertainty, and the maximum digitization error of 1 meter reported by other studies (Anders & Byrnes, 1991; Crowell and Leatherman, 1991; Morton and others, 2004). The no data value, -999, reflects areas where the WDL was digitized and uncertainty in shoreline position cannot be computed in this manner, confidently, due to the lack of beach slope information.
USGS
-999
6.08276253
U.S. Geological Survey Coastal and Marine Science Center
Christopher G. Smith
Mailing
600 4th Street South
St. Petersburg
FL
33701
727-502-8035
727-502-8182
cgsmith@usgs.gov
GrandBay_2010_Shoreline.shp
This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
SHP (Esri Shapefile)
The download file (.zip format) included in this data release contains a shapefile of an aerial-imagery derived shoreline from 2010 for Grand Bay, Mississippi and Alabama.
Unzip
https://coastal.er.usgs.gov/data-release/doi-F7VT1R8Q/data/GrandBay_2010_Shoreline.zip
None. No fees are applicable for obtaining the dataset.
20201013
U.S. Geological Survey Coastal and Marine Science Center
Christopher G. Smith
Mailing
600 4th Street South
St. Petersburg
FL
33701
727-502-8035
727-502-8182
cgsmith@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time