USGS Data Series 835: Data Downloads - Archive of Single-Beam Bathymetry Data Collected from Select Areas in Weeks Bay and Weeks Bayou, Southwest Louisiana, January 2013

DATA DOWNLOADS

The DEMs are presented as interpolated grids in GeoTIFF format and can be opened directly in Esri ArcGIS 9.3 or higher. The map documents and shapefiles provided in this report were created in Esri ArcGIS 10.1 and can be found in the GIS Project folder. To open this folder in Esri ArcGIS, right-click and choose "Save As". The folder contains the .mxd file and all associated shapefiles and tiffs. The shapefiles provided may also be viewed using other versions of ArcView, ArcGIS, or ArcExplorer software available for download at http://www.Esri.com/software/arcexplorer/. Do not use these data for navigational purposes. The metadata for these files can be found within the metadata folder or by clicking 13CCT01_metadata (53 KB).

File Description	File Format	Download File
Esri ArcGIS project folder	Esri files	Port_Channel_North_2013_Bathy_SingleBeam_GIS_Project.zip (5.6 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Port_Channel_North_2013_Bathy_SingleBeam_ITRF00_DEM (0.015 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Port_Channel_North_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_DEM (0.015 MB)
Error (point file; UTM)	Esri point shapefile	Port_Channel_North_2013_Bathy_SingleBeam_Error (0.013 MB)
Single-beam tracklines (UTM)	Esri line shapefile	Port_Channel_North_2013_Bathy_SingleBeam_tracklines (0.006 MB)
XYZ (UTM)	ASCII	Port_Channel_North_2013_Bathy_SingleBeam_ITRF00_xyz (6.92 MB)

XYZ (UTM)	ASCII	Port_Channel_North_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_xyz (3.15 MB)
Esri ArcGIS project folder	Esri files	Port_Channel_South_2013_Bathy_SingleBeam_GIS_Project.zip (10.6 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Port_Channel_South_2013_Bathy_SingleBeam_ITRF00_DEM (0.015 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Port_Channel_South_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_DEM (0.015 MB)
Error (point file; UTM)	Esri point shapefile	Port_Channel_South_2013_Bathy_SingleBeam_Error (0.012 MB)
Single-beam tracklines (UTM)	Esri line shapefile	Port_Channel_South_2013_Bathy_SingleBeam_tracklines (0.008 MB)
XYZ (UTM)	ASCII	Port_Channel_South_2013_Bathy_SingleBeam_ITRF00_xyz (12.4 MB)

XYZ (UTM)	ASCII	Port_Channel_South_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_xyz (5.69 MB)

Esri ArcGIS project folder	Esri files	Weeks_Bayou_2013_Bathy_SingleBeam_GIS_Project.zip (17.8 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Weeks_Bayou_2013_Bathy_SingleBeam_ITRF00_DEM (0.015 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Weeks_Bayou_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_DEM (0.015 MB)
Error (point file; UTM)	Esri point shapefile	Weeks_Bayou_2013_Bathy_SingleBeam_Error (0.013 MB)
Single-beam tracklines (UTM)	Esri line shapefile	Weeks_Bayou_2013_Bathy_SingleBeam_tracklines (0.008 MB)
XYZ (UTM)	ASCII	Weeks_Bayou_2013_Bathy_SingleBeam_ITRF00_xyz (22.7 MB)

XYZ (UTM)	ASCII	Weeks_Bayou_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_xyz (10.4 MB)

Esri ArcGIS project folder	Esri files	Shark_Island_Bayou_2013_Bathy_SingleBeam_GIS_Project.zip (5.8 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Shark_Island_Bayou_2013_Bathy_SingleBeam_ITRF00_DEM (0.015 MB)
Bathymetry (10-m cell size; UTM)	Esri Grid 32-bit floating point	Shark_Island_Bayou_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_DEM (0.015 MB)
Error (point file; UTM)	Esri point shapefile	Shark_Island_Bayou_2013_Bathy_SingleBeam_Error (0.014 MB)
Singlebeam tracklines (UTM)	Esri line shapefile	Shark_Island_Bayou_2013_Bathy_SingleBeam_tracklines (0.008 MB)
XYZ (UTM)	ASCII	Shark_Island_Bayou_2013_Bathy_SingleBeam_ITRF00_xyz (6.70 MB)

XYZ (UTM)	ASCII	Shark_Island_Bayou_2013_Bathy_SingleBeam_NAD83_NAVD88_GEOID12A_xyz (3.26 MB)

A Note on Coordinate Systems

WGS84 (equivalent to ITRF00) and NAD83 have been revised several times, resulting in coordinate shifts of as much as several meters in x,y, and z. The revision is indicated by the designator following the name (G1150 following WGS84, for example). Care should be taken using software that does not distinguish between the different versions of these datums; lack of the designator is a warning sign that software does not support three-dimensional (3D) datum shifts properly. Users should pay particular attention to the accompanying metadata files to ensure that the data are properly georeferenced. In particular, note that most current GIS software (including ArcGIS 10.1) cannot properly transform high-resolution elevation data from one 3D datum to another such as WGS84 (G1150) to NAD83 (CORS96) without introducing errors on the order of 1 m to 2 m in x,y, and z.

The data in this report are provided in UTM zone 15 north horizontal datum of ITRF00 (equivalent to WGS84 G1150), and ellipsoid height in meters. The final data were then converted from this into the horizontal datum of NAD83 (CORS96) and the vertical datum of NAVD88 with respect to GEOID12A. Both the horizontal and the vertical components were transformed using NOAA's VDatum tool version 3.2 (http://vdatum.noaa.gov/).

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