Continuous terrain model for water circulation studies, Barnegat Bay, New Jersey (10 meter resolution, 32-bit GeoTIFF, UTM 18, WGS 84)

STEP 1.CREATE FEATURE DATASET. Create a feature dataset "BBTerrainAll" within a file geodatabase that will store the input points and final terrain model using ArcCatalog (v.9.3.1). Feature dataset was created using the Universal Transverse Mercator (UTM) Zone 18, WGS 84 horizontal coordinate system and a vertical reference system using the North American Vertical Datum of 1988 (NAVD 88), meters.

STEP 2:Create boundary of the computational domain used for water circulation modeling. Created the domain extent in MatLab (v. 2011b) and exported as a ArcGIS (v. 10.2.2) polygon shapefile (IntGridBffr.shp) using the geographic coordinate system (WGS 84). Projected the shapefile IntGridBffr.shp to an ArcGIS (v. 9.3.1) feature class (IntGridBndrBuff) using the UTM Zone 18 (WGS 84) coordinate system. The output feature class was loaded into the "BBTerrainAll" feature dataset.

STEP 3: DOWNLOAD AND CONVERT HISTORICAL OFFSHORE MULTIBEAM DATA FROM THE NATIONAL OCEAN SERVICE. Five multibeam surveys were accessed using the highest resolution available, either xyz, or bathymetric attributed grid (BAG). Surveys H11495, H11455, H11456, H11241, were downloaded as point soundings from the survey Smooth Sheet or of similar density average distance between points is approximately 75-100 meters. Survey H11536 was available as 1 meter BAG files and then and resampled to 25-m grid cell resolution using the resample tool within ArcGIS (v. 10.2.2) and then exported as an x,y,z file. Finally, combined all five surveys in x,y,z format into one x,y,z file (NOAA_offshore_xyzMLLW.txt) using Microsoft Excel. Data are published using the geographic coordinate system NAD 83, and a tidal datum of Mean Lower Low Water (MLLW) These data were converted to the Universal Transverse Mercator coordinate system (WGS 84) Zone 18, and NAVD 88 vertical datum using the Vertical Transformation tool (VDatum, v. 2.3.3) produced by the National Geodetic Survey. The converted file "NOAA_offshore_NAVD88.txt" was finally converted to a point feature class (NOAA_depthsNAVD88) using the "create feature class from x y table" context menu within ArcGIS (v. 9.3.1). Finally, the "NOAA_DepthNAVD88" feature class was loaded into the "BBTerrainAll" feature dataset.

STEP 4: DOWNLOAD AND CONVERT NATIONAL ELEVATION DATA. Downloaded two, one third arc-second tiles from the National Elevation Dataset using the geographic coordinate system (NAD 83) and NAVD 88 vertical datum. The tiles were clipped to the model domain (IntGridBndryBuff) and the two tiles were merged into one ArcRaster grid (NED10mClip) with output resolution of 10 meters, and a projected coordinate system of Universal Transverse Mercator (UTM) zone 18, WGS 84. The grid was then converted to a multipoint feature class (NED10_MP) using the Convert Raster to Multipoint tool in ArcGIS (v. 10.2.2) and loaded into the "BBTerrainAll" feature dataset.

STEP 5: CONVERT 2m CSAR to 5m X,Y,Z. Convert BarnBayOFR2m.csar to BarnBayOFR5mxyz.csv using CARIS Base Editor (v. 4.1). Then created a point feature class (SWATHBath5m) from the x,y,z file using the "create feature class from x,y" context menu within ArcGIS (v. 9.3.1) and the output was loaded into the "BBTerrainAll" feature dataset.

STEP 6: CREATE 3D polygon for Manasquan Inlet. Historical soundings were sparse in the inlet. Create new 3D Polygon feature class "ManasqnInlet3d" with a constant depth of 1.75 meters (NAVD 88) to represent the last known dredged depth of the inlet (6 feet MLLW).

STEP 7: DOWNLOAD AND MOSAIC EAARL-B SUBMERGED TOPOGRAPHY. Downloaded all 13 GeoTIFFs and mosaicked into one GeoTIFF (ds855bath.tif) using ArcMap (v.10.2.2) using the mosaic tool. Masked out the areas of overlap with bbbath2m (EAARLBathClip.tif). Then exported the GeoTIFF as a multipoint feature class file (EAARLBath5mMultiPt)and loaded it into the "BBTerrainAll" feature dataset.

STEP 8: DOWNLOAD HISTORICAL INSHORE BATHYMETRY DATA FROM THE NATIONAL OCEAN SERVICE. Downloaded historical survey data from NOAA/NOS collected between 1934 and 1962 as the only existing recorded depths within Barnegat Bay. These soundings were used in portions of the bay and Little Egg Inlet where newer data did not cover. Data were in horizontal coordinate system of NAD 83 with a vertical datum of Mean Low Water (MLW). Each survey was converted to a point shapefile using the context menu in ArcCatalog (v. 9.3.1) for editing to remove overlapping points. Each shapefile was edited to remove soundings in locations where they overlapped with newer data covered by either the EAARL-B Lidar, or SWATHplus interferometric data. Once the shapefiles were edited, they were combined into one shapefile (NOAAPtsMLW.shp) and then converted to a x,y.z text file (NOAAPtsMLW.txt). This combined file was projected to horizontal coordinate system of UTM 18, Zone 18, WGS 84, and vertical datum of NAVD88 using the Vertical Datum Transformation tool (VDatum, v. 2.3.3) produced by the National Geodetic Survey. The difference between MLW and NAVD88 is 0.071 meters. Portions of H05615, H08672, and H08220 were not within the VDatum model boundary. Those points falling outside the boundary were referenced to NAVD88 using this 0.071 meter offset. Finally, the "NOAAInshorePtsNAVD88" feature class was loaded into the "BBTerrainAll" feature dataset

STEP 9: CREATE AND BUILD TERRAIN. Using the "New-Terrain" context menu within ArcCatalog (v. 9.3.1) created a new terrain model "BBTerrainAll10m" using all input points and polygons loaded into the "BBTerrainAll" feature dataset. Added the feature classes to the terrain and built to produce "BBTerrainAll". All point files were used as multipoint features, ManasqnInlet3d was used as a "hard replace", and IntGridBndryBuff was used as a "soft clip"

STEP 10: EXPORT TERRAIN Convert the terrain model to a raster using "TerrainToRaster" tool in ArcGIS ArcToolbox (v. 9.3.1). The Natural Neighbor interpolation option was used to grid the terrain model at 10-m resolution 32 bit floating point raster.Input= BBTerrainAll5m, output= BBTG10m.tif

Separated the two datasets associated with this data release and placed each (with related files) on its own ScienceBase child page rather than both datasets and associated files on a single landing page. This required updating various links in the metadata. While updating the metadata, other small edits were made such as modifying http://dx.doi.org to https://doi.org.

Added keywords section with USGS persistent identifier as theme keyword.