VBMP Digital Terrain Models - 2006/2007 (VA State Plane South)
Dataset Identification:
Resource Abstract:
Terrain data, as defined in FEMA Guidelines and Specifications, Appendix M: Data Capture Standards, describes the digital
topographic data that were used to create the elevation data representing the terrain environment of a watershed and/or floodplain.
Terrain data requirements allow for flexibility in the types of information provided as sources used to produce final terrain
deliverables. Once this type of data is provided, FEMA will be able to account for the origins of the flood study elevation
data. These files contain Digital Elevation Model (DTM) file data for the State of Virginia developed from imagery acquired
in spring 2006 and 2007. In the spring of 2006, the Commonwealth of Virginia, through the Virginia Geographic Information
Network Division (herein referred to as VGIN) of the Virginia Information Technologies Agency (VITA) contracted with the Sanborn
Map Company to provide Aerial data acquisition, ground control, aerotriangulation and development of statewide DTM and digital
orthophotography. The project encompasses the entire land area of the Commonwealth of Virginia. The State boundary is buffered
by 1000'. Coastal areas of the State bordering the Atlantic Ocean or the Chesapeake Bay shall be buffered by 1000' or the
extent of man-made features extending from shore. The entire State was intially designed to support 1"=200' (1:2400) scale
mapping. Jurisdictions throughout the State were provided an option to upgrade to a 1"=100' (1:1200) map scale. All data development
processes for the DTM conform to the ASPRS Draft Aerial Photography Standards (1995) and Model Virginia Map Accuracy Standards
(1992), which generally follow the ASPRS Accuracy Standard for Large-Scale Mapping (1990) for relevant mapping scales. The
DTM supports the creation of 6-inch or 1-foot map orthoimagery at the relevant scales.
Citation
Title VBMP Digital Terrain Models - 2006/2007 (VA State Plane South)
publication Date
2010-01-19
presentationForm
FEMA-DCS-TERRAIN
cited responsible party
-
publisher
organisation Name
Federal Emergency Management Agency
Contact information
Address
, Washington, DC
cited responsible party
-
originator
organisation Name
Virginia Geographic Information Network (VGIN)
cited responsible party
-
originator
organisation Name
Federal Emergency Management Agency
Terrain data is used to represent the topography of a watershed and/or floodplain environment and to extract useful information
for hydraulic and hydrologic models. (Source: FEMA Guidelines and Specs, Appendix N)
Resource language:
eng; USA
Resource progress code:
underDevelopment
Resource Maintenance Information
maintenance or update frequency:
unknown
Constraints on resource usage:
Constraints
Use limitation statement:
No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of
distribution constitute any such warranty.
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other constraints
Use Constraints: Acknowledgement of FEMA would be appreciated in products derived from these data. This digital data is produced
for the purposes of updating/creating a DFIRM database.
source description
Source Contribution: BreakLines and Tile IndexSource Type online
source citation
Title FDGC-Framework-Elevation-Mass Points/Variable Spacing
publication Date
2008-10-29
cited responsible party
-
originator
organisation Name
Dewberry and Davis, LLC
Resource extent
Temporal Extent
2008-10-29
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description
ASPRS Draft Aerial Photography Standards (1995) and Model Virginia Map Accuracy Standards (1992), which generally follow the
ASPRS Accuracy Standard for Large-Scale Mapping (1990) for relevant mapping scales.
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy
measure Description
Contact VGIN
Quantitative Result
result value -999999.999
value Units
Completeness Commission
evaluation Method Description
Data contained in the Terrain package highlight specific issues in elevation datasets. Terrain data are derived datasets that
aid automated hydrologic and hydraulic analyses, the flood hazard area boundary delineations, and quality control.
Completeness Omission
evaluation Method Description
Data contained in the Terrain package highlight specific issues in elevation datasets. Terrain data are derived datasets that
aid automated hydrologic and hydraulic analyses, the flood hazard area boundary delineations, and quality control.
ConceptualConsistency
measure Description
The terrain package includes flow vectors and non-tiled data (sinkBreach, NoData, VoidData, ExternalBoundary, Island). The
Terrain data are consistent with the elevation dataset. A comparison of profile plots with the flow vector data confirms that
flow vectors are correctly shown. Flood hazard boundaries do not extend beyond the External Boundary, if it exists. FIRM Panels
show the flood hazard area delineations where Island data are present.
notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version
FGDC-STD-001-1998) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
Metadata contact
-
pointOfContact
individual Name Cynthia Crouch
organisation Name
Dewberry and Davis, LLC
Contact information
Telephone
Voice 703.849.0503
Address
8401 Arlington Boulevard, Fairfax, Virginia, 22031-4666
Country USA