# 1:250,000 Scale Coastal Elevation Data

## Metadata:

- Identification_Information
- Spatial_Data_Organization_Information
- Spatial_Reference_Information
- Entity_and_Attribute_Information
- Distribution_Information
- Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: ICF Consulting, Inc.

Publication_Date:

Title: 1:250,000 Scale Coastal Elevation Data

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

Description: polygon files organized by 1:250K quadrangle for the entire East, Gulf and West U.S. coasts and attributed with elevation class (below one meter, between one meter and 3.5 meters, above 3.5 meters)

Abstract: These GIS data sets were produced in the course of analyzing digital elevation information for coastal areas of the contiguous 48 states. These data are polygonal, enhanced 1:250,000 scale USGS Digital Elevation Models. Explicit shoreline information was added from the NOAA Medium Resolution Vector shoreline. Manual edits were added in some areas to correct obvious errors in the source DEM data.

Purpose: Identify and quantify U.S. land areas to be potentially inundated by a one-meter rise in sea level.

Time_Period_of_Content: Same age as associated USGS 1:250,000 scale DEM base data.

Time_Period_Information: Same age as associated USGS 1:250,000 scale DEM base data.

Single_Date/Time:

Calendar_Date: Same age as associated USGS 1:250,000 scale DEM base data.

Currentness_Reference: Same age as associated USGS 1:250,000 scale DEM base data.

Status: Complete. Most East Coast areas will eventually be made available based on 1:24,000 scale base data.

Progress: Complete.

Maintenance_and_Update_Frequency: None. See Status.

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -178.227822

East_Bounding_Coordinate: -66.949831

North_Bounding_Coordinate: 71.382690

South_Bounding_Coordinate: 18.910842

Keywords:

Theme:

Theme_Keyword_Thesaurus:

Theme_Keyword: elevation, sea level rise

Access_Constraints: None.

Use_Constraints: These data were generated from USGS products that adhere to national map accuracy standards. While enhancements have been made, including cutting off the DEM at the shoreline, these data products were developed for specific mapping purposes and the use of these data for different applications cannot be guaranteed. These data may be used without constraint. However, users are cautioned that these data are partially based on edits that were intended to be rendered on small scale maps only; most of our maps were produced at a scale of 1:1,000,000 or more. Elevation edits typically extend well into the ocean because our process relied on the NOAA shoreline to draw that boundary.

Native_Data_Set_Environment: These data were developed using UNIX ArcInfo 7.x technology on a Sun workstation.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type:

Point_and_Vector_Object_Count:

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 29.5

Standard_Parallel: 45.5

Longitude_of_Central_Meridian: -96.0

Latitude_of_Projection_Origin: 23.0

False_Easting: 0.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method:

Coordinate_Representation:

Abscissa_Resolution: 0.0

Ordinate_Resolution: 0.0

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Clarke 1866

Semi-major_Axis:

Denominator_of_Flattening_Ratio:

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:

Attribute:

Attribute_Label: Area

Attribute_Definition: ArcInfo generated area value in square meters

Attribute_Definition_Source: ESRI

Attribute:

Attribute_Label: Perimeter

Attribute_Definition: ArcInfo generated perimeter value in square meters

Attribute_Definition_Source: ESRI

Attribute:

Attribute_Label: internal ID

Attribute_Definition: ArcInfo generated internal identifier

Attribute_Definition_Source: ESRI

Attribute:

Attribute_Label: user ID

Attribute_Definition: ArcInfo generated user identifier

Attribute_Definition_Source: ESRI

Attribute:

Attribute_Label: range-code

Attribute_Definition: A code derived from the elevation values supplied in the source DEM. Like the original source, these values are provided in units of whole meters. Unlike the original source, values higher than 4 are coded as 4. Our maps generally do not use this data field directly (see jim_elev.) For those that do, land polygons with values coded 0 or 1 are shown in red and interpreted as up to 1.5 meters above NGVD, land polygons with values coded 2 or 3 are coded blue and interpreted as up to 3.5 meters above NGVD, and land polygons with the value 4 are shown in light yellow and interpreted as uplands. We disregard this data field for polygons that appear to represent water.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: jim_elev

Attribute_Definition: This field reflects both the source DEM information and limited manual edits to resolve apparent errors based on review of selected USGS 7.5 minute series paper maps and is therefore used as the primary field in most of our thematic mapping. (West coast areas were not enhanced and thus the values of jim_elev should be the same as values in the range-code field.) Suspect areas in the East and Gulf Coasts were hand-sketched on small-format index sheets and digitized; the digitized data were used to create an updated copy of the same information contained in the range-code field. Note that the manual process distinguished between areas to be coded red, blue, or light yellow – not between individual integer values. Although the values 0 through 4 may occur, there is no meaningful distinction in this data field between the values 0 and 1 or between the values 2 and 3. For polygons that represent land, 0 or 1 are interpreted as areas up to 1.5m above NGVD, values 2 or 3 are interpreted as areas up to 3.5m above NGVD, and the value 4 represents upland areas. We disregard these values for polygons that appear to represent water. Note that this editing process was designed as a rapid way to exclude areas from appearing to be very low-lying areas based on the source DEM data when we have other information clarifying that they are not actually so close to sea level. No attempt was made to adhere to any particular spatial accuracy standard. Users are cautioned that these edits were intended to be rendered on small scale maps only; most of our maps were produced at a scale of 1:1,000,000 or more. Edits typically extend well into the ocean because our process relied on the NOAA shoreline to draw that boundary.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: edit_elev

Attribute_Definition: The higher of range-code and jim_elev. Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: titus_spline#

Attribute_Definition: Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: titus_spline-id

Attribute_Definition: Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: class

Attribute_Definition: Not used directly, but reflects the information used to create the updated jim_elev field from the un-edited range-code field. For polygons that represent land, R=red (up to 1.5m above NGVD29), B=blue (between 1.5 and 3.5m above NGVD29), N=neither(uplands 3.5m or more above NGVD29). This data field was the result of intersecting a separate ArcInfo coverage containing edits with each individual data set as appropriate.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: ts3c_bd#

Attribute_Definition: Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: ts3c_bd-id

Attribute_Definition: Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: class_v2

Attribute_Definition: Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: class_v1

Attribute_Definition: Not used.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: noaa-water

Attribute_Definition: Distinguishes land from water based on the NOAA Medium Resolution Vector shoreline. “y” = water (printed light blue on our maps), “n” = land (printed according to the contents of jim_elev on our maps.) Note that our production process involved converting the linear shoreline provided by NOAA to polygons and coding those polygons as land and water as appropriate. In some cases we may have missed inland ponds and falsely coded those areas as land. This is the second most critical field to jim_elev when generating maps.

Attribute_Definition_Source: ICF Consulting, Inc.

Attribute:

Attribute_Label: stateabb

Attribute_Definition: 2-character state abbreviations, in upper case, used for statistical tabulations.

Attribute_Definition_Source: ICF Consulting, Inc.

Distribution_Information:

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size:

Metadata_Reference_Information:

Metadata_Date: 20011212

Metadata_Contact: ICF Consulting, Inc., GIS Lab

Contact_Information: 703-934-3000

Contact_Organization_Primary:

Contact_Organization: EPA

Contact_Person: Jim Titus

Contact_Address:

Address_Type:

City:

State_or_Province:

Postal_Code:

Contact_Voice_Telephone:

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile

Generated by `mp` version 2.7.3 on Wed Dec 12 14:54:47 2001