Digital Shoreline Analysis System version 4.3 shoreline intersection points used to calculate long-term shoreline change statistics for the Outer Cape Cod coastal region from Long Point in Provincetown to Monomoy Island (OuterCapeCod_intersects_LTw.shp)

The southern end of the Outer Cape Cod region from Nauset Beach in Chatham to Monomoy Island is a highly dynamic barrier system. Because of the complexity of the associated vector shorelines in this area, it was necessary to calculate shoreline change statistics for the Chatham-Monomoy section in batches, separating the backshore shorelines (sheltered coast) from Atlantic-facing (open ocean) shorelines. Therefore, shoreline change statistics were calculated three times to compute a complete set of rates for the Outer Cape Cod region. The attribute field Calc_run represents the extent of each section used to calculate rates for the Outer Cape Cod region, where:
1- Includes the ocean-facing coast from Long Point in Provincetown to Nauset Beach in Orleans, including the backshore (sheltered) region within Pleasant Bay; 2- Includes the Atlantic ocean-facing coast (open ocean), southeast of Toms Neck in Chatham to Monomoy Island. 3- Includes the backshore (sheltered) coast, southeast of Toms Neck in Chatham to Monomoy Island;
Rate Calculations Performed using DSAS v.4.3 for ArcMap 10 for the Outer Cape Cod region section 1 (ocean-facing coast from Long Point in Provincetown to Nauset Beach in Orleans, including the backshore (sheltered) region within Pleasant Bay). Parameters Used: shoreline layer=OuterCapeCod_shorelines, shoreline date field=Date_, shoreline uncertainty field name=Uncy (additional shoreline data stored in OuterCapeCod_shorelines_uncertainty.dbf), the default accuracy=10.8 meters, shoreline intersection parameters=nearest, stats calculations=[Shoreline Change Envelope (SCE), Net Shoreline Movement (NSM), Linear Regression Rate (LRR)], shoreline threshold=3, confidence interval=90%, Output rate table name=OuterCapeCod_transects_rates_20121212_095458.dbf. Output intersects table name=OuterCapeCod_transects_intersect_20121212_095458.dbf.
This process step and all subsequent process steps were performed by Theresa Smith.

The shoreline intersects output table contains X- and Y-coordinate information for each shoreline measurement on DSAS transects. This table (OuterCapeCod_transects_intersect_20121212_095458.dbf) was used to create a temporary event theme to preview the transect/shoreline measurement locations in ArcMap. The intersects file was right-clicked in the ArcMap (v.10) table of contents. "Display XY data..." was chosen from the pop-up menu. A new Display XY Data window opens and the following parameters were entered: X Field: IntersectX; Y Field; Intersect Y; Z Field: <None>; Coordinate System of Input Coordinates: NAD_1983_Massachusetts_Mainland_FIPS_2001.

The temporary event theme is saved to a shapefile by right-clicking the OuterCapeCod_transects_intersect_20121212_095458 Events layer in the table of contents (ArcMap 10) and choosing Data > Export Data from the pop-up menu. This opens an Export Data window where the following parameters were entered: Export: All features; Select "Use the same coordinate system as this layer's source data"; Output feature class: OuterCapeCod_intersects_LTw.shp.

The transects_rates output shapefile for section 1, (OuterCape Cod_transects_rates_LTw.shp) was joined to the intersects shapefile (OuterCapeCod_intersects_LTw) in ArcMap v.10 by right-clicking on the intersects layer > joins and relates > join > join attributes from a table. Parameters: join field - TransectID; table to join - OuterCapeCod_transects_rates_LTw.dbf; field in table: TransectID; join options - keep all records. The joined feature class' attribute table was displayed in ArcMap (v.10). Using standard editing tools, intersect data corresponding to transects 1384-2328, and 2336-2345 were deleted from the file, as they extend outside section 1.

Due to the lack of continuous long-term shoreline position data, some transects intersected shorelines from 1970-2009, but did not intersect shorelines prior to 1970, which resulted in long-term linear regression rates that were identical to the short-term. Transects and corresponding intersects used to compute long-term linear regression rates that did not intersect long-term shoreline data (1844-1970) were deleted in a standard editing session (ArcMAP v10).

Rate Calculations Performed using DSAS 4.3 for ArcMap 10 along section 2 (Atlantic ocean-facing coast (open ocean), southeast of Toms Neck in Chatham to Monomoy Island) on Selected Shoreline Features Only (shoreline location= open ocean). Parameters Used: shoreline layer=OuterCapeCod_shorelines, shoreline date field=Date_, shoreline uncertainty field name=Uncy, the default accuracy=10.8 meters, shoreline intersection parameters=nearest, stats calculations=[Shoreline Change Envelope (SCE), Net Shoreline Movement (NSM), Linear Regression Rate (LRR)], shoreline threshold=3, confidence interval=90%, Output rate table name=OuterCapeCod_transects_rates_20130422_122024.

The shoreline intersects output table contains X- and Y-coordinate information for each shoreline measurement on DSAS transects. This table (OuterCapeCod_transects_intersect_20130422_122024.dbf) was used to create a temporary event theme to preview the transect/shoreline measurement locations in ArcMap. The intersects file was right-clicked in the ArcMap (v.10) table of contents. "Display XY data..." was chosen from the pop-up menu. A new Display XY Data window opens and the following parameters were entered: X Field: IntersectX; Y Field; Intersect Y; Z Field: <None>; Coordinate System of Input Coordinates: NAD_1983_Massachusetts_Mainland_FIPS_2001.

The temporary event theme was saved to a shapefile by right-clicking the OuterCapeCod_transects_intersect_20130422_122024 Events layer in the table of contents (ArcMap 10) and choosing Data > Export Data from the pop-up menu. This opened an Export Data window where the following parameters were entered: Export: All features; Select "Use the same coordinate system as this layer's source data"; Output feature class: OuterCapeCod_intersects_LTw_sect2.shp.

The transects_rates output shapefile for the Chatham-Monomoy ocean-facing coast section (OuterCape Cod_transects_rates_LTw_sect2.shp) was joined to the intersects shapefile (OuterCapeCod_intersects_LTw_sect2) in ArcMap v.10 by right-clicking on the intersects layer > joins and relates > join > join attributes from a table. Parameters: join field - TransectID; table to join - OuterCapeCod_transects_rates_LTw_sect2.dbf; field in table: TransectID; join options - keep all records. The joined feature class' attribute table was displayed in ArcMap (v.10). Using standard editing tools, intersect data corresponding to transects 1-1383, 1781-2328, and 2336-2345 were deleted from the file, as they extend outside section 2.

Rate Calculations Performed using DSAS 4.3 for ArcMap 10 along section 3 (backshore (sheltered) coast, southeast of Toms Neck in Chatham to Monomoy Island) on Selected Shoreline Features Only (shoreline location= sheltered coasts). Parameters Used: shoreline layer=OuterCapeCod_shorelines, shoreline date field=Date_, shoreline uncertainty field name=Uncy, the default accuracy=10.8 meters, shoreline intersection parameters=nearest, stats calculations=[Shoreline Change Envelope (SCE), Net Shoreline Movement (NSM), Linear Regression Rate (LRR)], shoreline threshold=3, confidence interval=90%, Output rate table name=OuterCapeCod_transects_rates_20130422_111818.

The shoreline intersects output table contains X- and Y-coordinate information for each shoreline measurement on DSAS transects. This table (OuterCapeCod_transects_intersect_20130422_111818.dbf) was used to create a temporary event theme to preview the transect/shoreline measurement locations in ArcMap. The intersects file was right-clicked in the ArcMap (v.10) table of contents. "Display XY data..." was chosen from the pop-up menu. A new Display XY Data window opens and the following parameters were entered: X Field: IntersectX; Y Field; Intersect Y; Z Field: <None>; Coordinate System of Input Coordinates: NAD_1983_Massachusetts_Mainland_FIPS_2001.

The temporary event theme is saved to a shapefile by right-clicking the OuterCapeCod_transects_intersect_20130422_111818 Events layer in the table of contents (ArcMap 10) and choosing Data > Export Data from the pop-up menu. This opens an Export Data window where the following parameters were entered: Export: All features; Select "Use the same coordinate system as this layer's source data"; Output feature class: OuterCapeCod_intersects_LTw_sect3.shp.

The transects_rates output shapefile for the Chatham-Monomoy sheltered coast section (OuterCapeCod_transects_rates_LTw_sect3.shp) was joined to the intersects shapefile (OuterCapeCod_intersects_LTw_sect3) in ArcMap v.10 by right-clicking on the intersects layer > joins and relates > join > join attributes from a table. Parameters: join field - TransectID; table to join - OuterCapeCod_transects_rates_LTw_sect3.dbf; field in table: TransectID; join options - keep all records. The joined feature class' attribute table was displayed in ArcMap (v.10). Using standard editing tools, intersect data corresponding to transects 1-1763, 1781-1967, and 1968-2093 were deleted from the file, as they extend outside section 3.

The shapefiles OuterCapeCod_intersects_LTw_sect2.shp, and OuterCapeCod_intersects_LTw_sect3.shp (sections 2 and 3) were merged in Esri's ArcToolbox (v.10), Data Management Tools > General > Merge. The merged shapefile was then appended to the OuterCapeCod_intersects_LTw.shp (section 1), ArcToolbox >Data Management Tools>General>Append to produce one set of results for display and publication purposes encompassing the whole extent of the Outer Cape Cod region.

The appended transect shapefile was projected in Esri's ArcToolbox (v.10) > Data Management Tools > Projections and Transformations > Feature > Project. Parameters: input projection - NAD_1983_StatePlane_Massachusetts_Mainland_FIPS_2001; output projection - geographic coordinates (NAD83); transformation - none.

Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Attempted to modify http to https where appropriate. Added a landing page link as the first link in the identification section. Fixed online link to DSAS cross-reference. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.

Added keywords section with USGS persistent identifier as theme keyword.