Attribute_Accuracy:
Attribute_Accuracy_Report:
Water and land boundary inherit from accuracy of source data EBFNWR. Marsh units elevation value accuracy depend on vertical and horizontal accuracy of the source, National Elevation Dataset (NED).
Logical_Consistency_Report:
Generally positive elevation means marsh unit is above sea level. There are 3 marsh units (FID_CMU= 499, 1312, 1320) which have been assigned zero elevation. These units, although classified to have regularly flooded, emergent wetland in the source dataset, are small land (less than 7000 m2), fragmented islands from mainland and receive zero elevation in NED. There are 11 marsh units (FID_CMU= 426, 427, 430, 444, 635, 1058, 1141, 1142, 1143, 1144, 1147, 1291) which have considerably high elevation (higher than 2 m) compared to the tidal range. Based on Google Maps aerial imagery these seem to be classified incorrectly as wetland in the source dataset and require ground truthing to clarify.
Completeness_Report:
The results are specific to the marsh polygons definition within the boundaries of the EBFNWR salt marsh complex (Defne and Ganju 2016). 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 NED 1/9 second (~3-meter) dataset. Although the analyses were performed at 1-meter resolution for smoother conformity with the clipping polygons, the resolution of the final product should be considered to be greater than 3 meters.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Vertical accuracy is inherited from NED 1/9 second (~3-meter) dataset. No additional accuracy assessment of the vertical positional information has been conducted.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Zafer Defne
Originator: Neil K. Ganju
Publication_Date: 2016
Title:
Conceptual salt marsh units for wetland synthesis: Edwin B. Forsythe National Wildlife Refuge, New Jersey
Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F7QV3JPG
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7QV3JPG
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2016
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: marshUnitsEBFp.shp
Source_Contribution:
Downloaded and used the features in [marshUnitsEBFp.shp] to calculate the mean elevation for each marsh unit
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 20110215
Title: USGS National Elevation Dataset (NED) 1/9 arc-second
Geospatial_Data_Presentation_Form: Raster Digital Data Set
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
The following USGS NED ned19 tiles were used in analyses (11 tiles):
1) USGS NED ned19 n39x50_w074x50_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
2) USGS NED ned19 n39x50_w074x75_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
3) USGS NED ned19 n39x75_w074x25_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
4) USGS NED ned19 n39x75_w074x50_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
5) USGS NED ned19 n39x75_w074x75_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
6) USGS NED ned19 n40x00_w074x25_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
7) USGS NED ned19 n40x00_w074x50_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
8) USGS NED ned19 n40x00_w074x75_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
9) USGS NED ned19 n40x25_w074x25_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
10) USGS NED ned19 n40x25_w074x50_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
11) USGS NED ned19 n40x25_w074x75_nj_3coastalcounties_2011 1/9 arc-second 2012 15_x_15 minute IMG
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2012
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: NED
Source_Contribution:
Elevation data from eleven USGS NED ned19 tiles (see Other Citation Details) were used in analyses. Download date was 20160801.
Process_Step:
Process_Description:
This process step and all subsequent process steps were performed by the same person, Zafer Defne, in ArcMap (ver. 10.5.1) using tools from ArcToolbox, unless otherwise stated. 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) 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 USGS NED 1/9 second tiles to a new raster dataset with 1m resolution. Resolution is increased from 3 m to 1 m to have a finer representation of the polygon boundaries in the horizontal during this step.
b) Calculate values for each marsh unit. DISSOLVE(Input features=[marshUnitsEBFp]; Output=[mu_disss.shp]; Dissolve field=FID_CMU) to dissolve the vegetated and unvegetated in each marsh unit into one feature.
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=[marshUnitsEBFp]; zone field=FID_CMU; Value Raster=[elev_idw_mu.tif]; Output Table=mu; Statistics type=MEAN)
e) ADD JOIN(Layer name=[marshUnitsEBFp]; 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 [marshUnitsEBFp] where "CLASS"= 'vegetated'. SELECT BY ATTRIBUTES FROM [marshUnitsEBFp] 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. Name AVEG_M2 and ATOT_M2 for vegetated and total area, respectively, and export to a new shapefile [mu_elev_EBFNWRp.shp].
Source_Used_Citation_Abbreviation: marshUnitsEBFp
Source_Used_Citation_Abbreviation: NED
Process_Date: 2018
Source_Produced_Citation_Abbreviation: mu_elev_EBFNWRp
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Zafer Defne
Contact_Position: Ocean Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Contact_Voice_Telephone: 508-457-8700 x2254
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: zdefne@usgs.gov
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
