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U.S. Geological Survey Open-File Report 2012-1157

Shallow Geology, Seafloor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts


Appendix 1 Geospatial Data

Skip past contents information This section describes the qualitatively-derived data interpretation and selected source data files, the location of the data, and how to access the data.

Data Format and Projection
All vector data are delivered as Esri shapefiles in the geographic coordinate system (WGS84). The raster data are Esri binary grid format or GeoTiff in Universal Transverse Mercator projection, Zone 19N, WGS84 datum. All spatial data are distributed with Federal Geographic Data Committee (FGDC) compliant metadata in text and FGDC Classic and FAQ [in hypertext markup language(*.HTML)] formats.  Esri ArcCatalog can also be used to examine the metadata available in the Esri XML format associated with each GIS data file.

Data Access
The datasets from this project can be accessed in the following ways, depending on available software:
With ArcGIS 9.3 or later, all shapefile and raster data may be viewed and manipulated, although the Spatial Analyst extension will be required to fully examine and work with the Esri grids. Copy the GIS_catalog folder or download the GIS_catalog.zip file (90 megabytes) to a computer and open the ArcMap document 2012-1157.mxd. This map document has all the data layers loaded in the table of contents and uses relative links.

Without any GIS software, view the data through ArcReader, a free mapping application distributed by Esri for Windows, Linux, and Unix operating systems. Download ArcReader from the Esri Web site (http://www.Esri.com/software/arcgis/arcreader/download.html) and follow the directions for downloading and installing the free software. Once ArcReader is installed, all the data can be viewed by opening the published map file (PFM) named 2012-1157.pmf, which was created in ArcMap version 9.3.1.

Data Organization
The data are organized in folders on the Publications Warehouse Web site. The file structure is the same for both media and is described below. Data layers can be downloaded individually using the table below or collectively from the GIS_catalog.zip file.

folder.GIS_catalog

The following is a listing of selected contents of the GIS_catalog.zip file:

folder.Basemap

OUTLINE25K_POLY_dd.shp– Outline of the Commonwealth of Massachusetts (1:25,000)

folder.PhysiographicZones

NAH_CCB_Pzones.shp– Shapefile: Physiographic Zones polygons defined through the interpretation of geophysical and sample data.

folder.SedimentTexture

NAH_CCB_sedcover.shp– Shapefile: Sediment Texture polygons defined through the interpretation of geophysical and sample data.

folder.SourceData

folder.bathy

navd_bath_30m– Grid: Bathymetry at 30-m resolution.

NAVD88_HS_30m.tif– Image: Hillshaded relief image at 30-m resolution.

BScomposite_10m.tif– Image: Acoustic backscatter intensity mosaic at 10-m resolution.

folder.Stratigraphy

folder.Qfe

qfeiso– Grid: Isopach of Qfe stratigraphic unit at 50-m resolution.

folder.Qm

qmiso– Grid: Isopach of Qmn and Qmd stratigraphic units at 50-m resolution.

folder.Ur

folder.surface

urelev– Grid: Elevation of Ur surface at 50-m resolution.

urelevhs.tif– Image: Hillshaded relief image of the Ur ravinement surface at 50-m resolution.

folder.Ut

folder.surface

utelev– Grid: Elevation of Ut surface at 50-m resolution.

utelevhs.tif– Image: Hillshaded relief image of the Ut ravinement surface at 50-m resolution.

folder.SurficialGeology

Nahant_CCB_surfgeol.shp– Shapefile: Surficial geology as defined through the interpretation of seismic profiles

Map document:

2012-1157.mxd – ArcMap™ 9.2 map document containing selected data layers described above.

Data Preview

To download raster and vector data, right click on the link within the 'transfer file' column in the table below. 'Save Target As...' to save a compressed ZIP file to the local hard drive.

File description

File name (metadata link)

Preview File format Transfer file File transfer size
Basemap

1:25K Massachusetts shoreline shapefile (Geographic)

OUTLINE25K_POLY_dd.shp basemap Esri Shapefile (Polygons) OUTLINE25K_POLY_dd.zip 2.4 MB
Physiographic Zones

Physiographic Zones (Geographic)

NAH_CCB_Pzones.shp

 

physiographic zone shapefile

Esri Shapefile (Polygons) PhysioZones.zip

1 MB

 

Sediment Texture

Sediment Texture (Geographic)

NAH_CCB_sedcover.shp sediment texture shapefile Esri shapefile (polygons) SedCover.zip 1 MB
Source Data
NAVD88 Bathymetry and Topography grid (30-m cell size; UTM Zone 19N) navd_bath_30m bathymetry grid Esri grid, 32 bit floating point bathy_30m.zip 30.3 MB
Bathymetry and Topography hillshade image (30-m cell size; UTM Zone 19N) NAVD88_HS_30m.tif Hillshaded relief image GeoTIFF HS_30m.zip 7.0 MB

Backscatter mosaic (10-m cell size; UTM Zone 19N)

BScomposite_10m.tif backscatter mosaic GeoTIFF BS_10m.zip 43.7 MB
Stratigraphy

Isopach grid (50-m cell size; UTM Zone 19N)

qfeiso

 

Qfe isopach grid Esri grid, 32 bit floating point Qfe_50m.zip 435 KB

Isopach grid (50-m cell size; UTM Zone 19N)

qmiso

 

Qm isopach grid Esri grid, 32 bit floating point Qm_50m.zip 513 KB

Elevation grid (50-m cell size; UTM Zone 19N)

urelev

 

regressive surface Esri grid, 32 bit floating point Ur_50m.zip 725 KB

Elevation hillshade image (50-m cell size; UTM Zone 19N)

urelevhs.tif

 

regressive surface hillshade image GeoTIFF Ur_hs_50m.zip 138 KB

Elevation grid (50-m cell size; UTM Zone 19N)

utelev

 

transgressive surface Esri grid, 32 bit floating point Ut_50m.zip 930 KB

Elevation hillshade image (50-m cell size; UTM Zone 19N)

utelevhs.tif

 

transgressive surface hillshade image GeoTIFF Ut_hs_50m.zip 115 KB
Surficial Geology

Surficial Geology (Geographic)

Nahant_CCB_surfgeol.shp

 

bathy grid Esri shapefile (polygons) SurfGeo.zip 243 KB
 

 

   

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