Tidal Marsh Inventory for James City County
and the City of Williamsburg 2014
Shapefile
Tags
Tidal Marsh, Virginia, Chickahominy River, College Creek, James River, Skimino Creek, Taskinas Creek,
York River, James City County, City of Williamsburg
Summary
To maintain and update an inventory of the distribution
of tidal marshes for the Commonwealth of Virginia.
Description
The Virginia Institute of Marine Science published the
first Tidal marsh Inventories for the James City County in 1980 using data
collected in the 1970's. Using high resolution color infra-red imagery from
2009 and 2011 a new Tidal Marsh Inventory has been developed for 2014. Marsh
boundaries were generated using heads-up digitizing techniques at a scale of
1:1,000. Each marsh polygon was classified by morphologic type: fringe,
extensive, embayed, or marsh island. Marshes were
ground-truthed in the field where a community type
index was assigned to each marsh based on plant community make-up.
Credits
There are no credits for this item.
Use limitations
There are no access and use limitations for this item.
Extent
|
West |
-76.917628 |
East |
-76.578166 |
|
North |
37.461034 |
South |
37.164981 |
Scale Range
|
Maximum
(zoomed in) |
1:5,000 |
|
Minimum
(zoomed out) |
1:150,000,000 |
ArcGIS Metadata ▼►
Topics and Keywords ▼►
Themes or categories of the resource biota, boundaries,
environment
* Content type Downloadable Data
Export to FGDC CSDGM XML format as
Resource Description No
Place keywords Virginia, James City
County, City of Williamsburg, Chickahominy River, College Creek, Jamestown
Island, Mill Creek, James River, Gordon Creek, Diascund
Creek, Skimino Creek, Taskanas
Creek, York River
Theme keywords Tidal marsh, wetland
plant identification, wetland community type
Citation ▼►
Title Tidal Marsh Inventory for
James City County and the City of Williamsburg 2014
Creation date 2014-08-01 00:00:00
Publication date 2014-09-28 00:00:00
Presentation formats digital map
Collection title Tidal Marsh Inventory
for James City County and the City of Williamsburg 2014
Resource Details ▼►
Dataset languages English (UNITED
STATES)
Spatial representation type vector
* Processing
environment Microsoft
Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri
ArcGIS 10.1.0.3035
ArcGIS item properties
* Name JCC_Wmsbg_TMI2014
* Size 5.946
* Location http://ccrm.vims.edu/ccrmp/index.html
* Access protocol Comprehensive Coastal Resource Management Portal
Extents ▼►
Extent
Geographic extent
Bounding rectangle
Extent type Extent used for
searching
* West longitude -76.917628
* East longitude -76.578166
* North latitude 37.461034
* South latitude 37.164981
* Extent contains
the resource Yes
Extent in the item's coordinate system
* West longitude 330393.204266
* East longitude 359889.186543
* South latitude 4114882.934665
* North latitude 4147196.658203
* Extent contains
the resource Yes
Spatial Reference ▼►
ArcGIS coordinate system
* Type Projected
* Geographic
coordinate reference GCS_North_American_1983
* Projection NAD_1983_UTM_Zone_18N
* Coordinate
reference details
Projected coordinate system
Well-known identifier 26918
X origin -5120900
Y origin -9998100
XY scale 450445547.3910538
Z origin -100000
Z scale 10000
M origin -100000
M scale 10000
XY tolerance 0.001
Z tolerance 0.001
M tolerance 0.001
High precision true
LatestWKID 26918
Well-known text PROJCS["NAD_1983_UTM_Zone_18N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-75.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26918]]
Reference system identifier
Value 26918
* Codespace EPSG
* Version 7.9.4
Spatial Data Properties ▼►
* Level of
topology for this dataset geometry only
Geometric objects
Feature class name JCC_Wmsbg_TMI2014
* Object type composite
* Object count 1093
ArcGIS Feature Class Properties
Feature class name JCC_Wmsbg_TMI2014
* Feature type Simple
* Geometry type Polygon
* Has topology FALSE
* Feature count 1093
* Spatial index FALSE
* Linear
referencing FALSE
Data Quality ▼►
Lineage ▼►
When the process occurred 2014-03-01 00:00:00
Description Tidal marshes were delineated
from 2011 VBMP imagery using onscreen digitizing techniques at a scale of
1:1,000. The portions of James City County and the City of Williamsburg that
are within the York River watershed were digitized in 2010 using 2009 VBMP
imagery. The portions within the James River watershed were digitized in
2013-2014 using a combination of 2009, 2011, and 2013 VBMP imagery. Bing and
Google Earth online imagery was used to provide additional interpretive
information to improve the accuracy of marsh boundaries. Marsh polygons were
coded by shape and physiographic setting based on a classification system
applied in the first James City County Tidal Marsh Inventory (Moore, 1980).
Quality assurance and control measures were performed prior to generation of
maps for fieldwork.
When the process occurred 2014-05-01 00:00:00
Description VBMP imagery, with the
marsh polygon layer overlay, was printed for use in field surveys of the
marshes. The York River watershed portions of James City County and the City of
Williamsburg were surveyed in 2010 as part of a broader study of the York River
tidal marshes (Mitchell et al., 2011). The James River watershed portions of
James City County and the City of Williamsburg were surveyed in 2014.
When the process occurred 2014-06-01 00:00:00
Description Field collection of
marsh data was performed primarily from a small shallow-draft vessel, navigating
at slow speeds parallel to the shoreline. Surveys extended as far upstream as
depth and field conditions allowed. Some additional data collection was
performed by land where marshes were easily accessible from public lands.
During surveys, marsh boundaries were verified, and wetland plant species
observed within each marsh polygon were recorded along with relative cover
estimates to determine marsh community types.
When the process occurred 2014-07-01 00:00:00
Description All
observed tidal wetland plant species within each marsh polygon are recorded on the
field data sheets. For surveys conducted in 2010, percent cover was recorded
for each plant species observed. For surveys conducted after 2010, plant
species present were placed in one of three cover categories: Dominant
(>50%), Present (1-49%), or Trace (<1%). Marsh community type, based on
relative species dominance, was also recorded. Data from the 2010 survey was
converted to the 2013 format for merging purposes, but the original percent
cover data is available on request.
When the process occurred 2014-07-01 00:00:00
Description Corrections were made to
the digital data back at the lab using ArcGis Version
10.0.
Distribution ▼►
Distribution format
* Name Shapefile
Version Shapefile
Transfer options
* Transfer size 5.946
Fields ▼►
Details for object JCC_Wmsbg_TMI2014 ▼►
* Type Feature Class
* Row count 1093
* Alias FID
* Data type OID
* Width 4
* Precision 0
* Scale 0
* Field
description
Internal feature number.
* Description
source
ESRI
* Description of
values Sequential
unique whole numbers that are automatically generated.
* Alias Shape
* Data type Geometry
* Width 0
* Precision 0
* Scale 0
* Field
description
Feature geometry.
* Description
source
ESRI
* Description of
values Coordinates
defining the features.
* Alias Marsh_Type
* Data type String
* Width 50
* Precision 0
* Scale 0
Field
description
Tidal marshes take on several different morphologies. They can be embayed features that are set into the landscape with upland areas along the marsh edges. They can also be large extensive features that extend into the open water and have water on two or three sides. Fringe marshes grow nearly parallel to the shoreline and can be wide or narrow. An isolated marsh surrounded on all sides by open water; interior portions of the marsh may contain trees scattered at highest elevations In all cases, wetland vegetation must be relatively well established, although not necessarily healthy.
Description
source
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Description of
values Marsh
type: Embayed, Extensive, Marsh Island and Marsh Fringe <5 feet, 5-30 feet
and >30 feet.
Beginning date
of values 2014-06-01
Ending date of
values 2014-06-30
* Alias Area_Acres
* Data type Double
* Width 19
* Precision 0
* Scale 0
Field
description
The area of the polgon in acres.
Description
source
Processor
Description of
values area
in acres
* Alias Number
* Data type Integer
* Width 9
* Precision 9
* Scale 0
Field
description
Final ID number for marsh polygon
Description
source
Processor
Description of
values Number
generated for each polygon
* Alias Field2014
* Data type String
* Width 4
* Precision 0
* Scale 0
Field
description
Field work done during June 2014. Y = field checked in 2014 and N = not field checked.
Description
source
Processor
Beginning date
of values 2014-06-01
Ending date of
values 2014-06-30
* Alias NEW_ID
* Data type Double
* Width 12
* Precision 12
* Scale 0
Field
description
Marsh # from 2010 TMI Survey.
Description
source
Processor
* Alias TMI_NO
* Data type Double
* Width 11
* Precision 11
* Scale 0
Field
description
Marsh # from original TMI (70's)
Description
source
Processor
* Alias MFIPS
* Data type Double
* Width 16
* Precision 16
* Scale 0
Field
description
Marsh # plus County Code.
Description
source
Processor
* Alias TMI_TYPE
* Data type Double
* Width 10
* Precision 10
* Scale 0
Field
description
Marsh Community Type from original TMI
Description
source
Tidal Marsh Inventories – Community Types & Field Codes
List of values
Value Type I
Description Predominately Saltmarsh Cordgrass / low marsh
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type II
Description Predominately Saltmeadow / high marsh
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type III
Description Predominately Black Needlerush
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type IV
Description Predominately Saltbush
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type V
Description Predominately Big Cordgrass
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type VI
Description Predominately Cattail
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type VII
Description Predominately Arrow Arum
- Pickerelweed
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type VIII
Description Predominately Reed Grass
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type IX
Description Predominately Yellow Pond
Lily
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type X
Description Predominately Saltwort
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type XI
Description Freshwater mix - no
dominant species
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Value Type XII
Description Brackish mix - no
dominant specie
Enumerated
domain value definition source Tidal Marsh Inventories – Community Types
& Field Codes
Beginning date
of values 2014-06-01
Ending date of
values 2014-06-30
* Alias COMMENTS
* Data type String
* Width 28
* Precision 0
* Scale 0
Field
description
From 2010 survey - width of added fringe marshes.
Description
source
Processor
* Alias Field2010
* Data type String
* Width 5
* Precision 0
* Scale 0
Field
description
Y = field checked and N = not field checked
Description
source
Processor
* Alias County
* Data type String
* Width 5
* Precision 0
* Scale 0
Field
description
County or City name
Description
source
Processor
* Alias 10Field14
* Data type String
* Width 5
* Precision 0
* Scale 0
Field
description
Y = field checked in 2010 or 2014 and N = not checked in 2010 or 2014
Description
source
Processor
* Alias CmtyType
* Data type String
* Width 254
* Precision 0
* Scale 0
Field
description
Plant community type: I = Saltmarsh Cordgrass/low marsh,II = Saltmeadow/high marsh, III = Black Needlerush, IV = Saltbush, V = Big Cordgrass, VI = Cattail, VII = Arrow Arum, VIII = Reedgrass, IX = Yellow Pond Lily, X = Saltwort, XI = Freshwater mix, XII = Brackish mix
Description
source
Tidal Marsh Inventories – Community Types & Field Codes
* Alias Reedgrass
* Data type String
* Width 254
* Precision 0
* Scale 0
Field
description
D = Marsh 51-100% PhragmitesX = Marsh 1-50% PhragmitesT = Marsh < 1% Phragmites
Description
source
Processor
* Alias PrcntPhrag
* Data type String
* Width 8
* Precision 0
* Scale 0
Field
description
% cover of Phragmites in marsh
Description
source
Processor
* Alias FieldDate
* Data type Date
* Width 8
* Precision 0
* Scale 0
Field
description
Date of marsh survey
Description
source
Processor
* Alias Observer
* Data type String
* Width 254
* Precision 0
* Scale 0
Field
description
Field Personel
Description
source
Processor
* Alias CommunType
* Data type String
* Width 254
* Precision 0
* Scale 0
Field
description
Marsh Community Type from current TMI (2010 or 2014)
Description
source
Processor
* Alias Dominant_P
* Data type String
* Width 254
* Precision 0
* Scale 0
Field
description
Dominant plant species
Description
source
Processor
* Alias tmiID_2014
* Data type Integer
* Width 9
* Precision 9
* Scale 0
Field
description
ID number for marsh polygon
Description
source
processor
Description of
values Number
generated for each polygon
* Alias FieldCheck
* Data type String
* Width 5
* Precision 0
* Scale 0
Field
description
marshes were field checked
Description
source
processor
Description of
values Field
checked marshes are code as "Yes".
Metadata
Details ▼►
Metadata
language English (UNITED
STATES)
Metadata
character set utf8 - 8 bit UCS Transfer Format
Scope of the
data described by the metadata dataset
Scope name * dataset
* Last update 2014-11-20
ArcGIS metadata
properties
Metadata format ArcGIS 1.0
Metadata style FGDC CSDGM Metadata
Standard or
profile used to edit metadata ISO19139
Created in ArcGIS
for the item 2014-09-05 13:14:49
Last modified
in ArcGIS for the item 2014-11-20 10:48:54
Automatic
updates
Have been
performed Yes
Last update 2014-11-20 10:45:50
Metadata
Contacts ▼►
Metadata
contact
Individual's
name Sharon
Killeen
Organization's
name Comprehensive
Coastal Inventory, Virginia Institute of Marine Science (VIMS)
Contact's
position GIS
Programmer/Analyst
Contact's role point of contact
Metadata
Constraints ▼►
Constraints
Limitations of
use
The boundaries should not be used for jurisdictional determineations