CGIA, NC, 20040625, onemap_prod.SDEADMIN.brdgs.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.002048
Ordinates (y-coordinates) are specified to the nearest 0.002048
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
| Formal codeset | |
|---|---|
| Codeset Name: | County Names |
| Codeset Source: | State of North Carolina |
Coordinates defining the features.
Sequential identifier.
Bridge number varies.
| Value | Definition |
|---|---|
| O | Normal DOT Bridge |
| Value | Definition |
|---|---|
| NORMAL DOT BRIDGE | State bridge maintained by NC DOT |
Bridge number varies.
Feature varies
Structure varies
Location varies
Year varies
Width varies
Sequential unique whole numbers that are automatically generated.
| Formal codeset | |
|---|---|
| Codeset Name: | County codes |
| Codeset Source: | NC DOT |
Coordinates defining the features.
NC DOT GIS Unit NC DOT Bridge Maintenance Division NC CGIA NC Floodplain Mapping Program
919-733-2090 (voice)
919-715-0725 (FAX)
dataq@cgia.state.nc.us
This dataset was developed for the purpose of identifying bridges that may be affected by flood conditions. Bridges are part of the state's critical infrastructure and need to be included in natural hazard vulnerability analysis and risk assessments.
NC DOT Bridge Maintenance Division, and USGS Water Resources Division from NC DOT Bridge Maintenance Division, 2003, Bridges With 6-Digit ID from NC DOT Bridge Maintenance Division.
GIS, NC DOT Unit, 2003, NC Bridge Point Locations.
Person who carried out this activity:
919-733-2090 (voice)
919-715-0725 (FAX)
dataq@cgia.state.nc.us
Data sources used in this process:
Data sources used in this process:
GIS, NC DOT Unit, Unknown, NC DOT Bridges.
The bridge identification numbers from NCDOT and related attributes are presumed to be correct as of 2001 or 2002. Tabular data from the Bridge Maintenance Division were related to bridge identification numbers.
The point locations appear to be in the vicinity of related hydrography and road features. The base themes were mapped at 1:24,000 scale. The bridge source data were mapped at a scale no greater than 1:24,000 scale and perhaps at a smaller scale. Some point locations were greater than 100 feet from an apparent actual location based on the base maps.
No vertical attributes are included in this point theme.
The source data from NC DOT was not documented in terms of completeness. This dataset does not include bridges not maintained by NC DOT. CGIA did not use National Bridge Inventory data that was available in tabular format, presuming that the DOT bridges were included as a matter of course. If and when the National Bridge Inventory is geo-referenced, it merits a comparison to this data set to check for completeness.
The source data set from NC DOT GIS Unit was not documented. CGIA used ArcView software to check point locations in the context of detailed hydrography and NC DOT roads.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None.
- Use_Constraints:
- Acknowledgement of products derived form this data set should cite the following: The source of the bridge data is the North Carolina Center for Geographic Information and Analysis. Earlier versions of this data set may exist. The ser must be sure to use the appropriate data set for the time period of interest. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, CGIA cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers.
919-733-2090 (voice)
919-715-0725 (FAX)
dataq@cgia.state.nc.us
Point locations of NC DOT bridges in digital vector format.
NCCGIA is charged with the development and maintenance of the State's corporate geographic database and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the corporate database may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors,original map scale, collection methodology, currency of data, and other conditions specific to certain data. NCCGIA does not support secondary distribution of these data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.
| Data format: | ARCG (version 8) shapefile Size: 3.932 |
|---|---|
| Media you can order: |
CD-ROM
(format shapefile)
|
contact CGIA for fees for offline distribution and custom formatting
Contact CGIA at 919-733-2090
Data creation and large data analysis jobs contact Database Administration P:(919)733-2090. All data are available through standard ordering procedures on a cost recovery basis.
All formats supplied are created using ARC/INFO GIS software on Unix workstations or ArcGIS on Windows PCs. Other formats are available. Format compatibility is the user's responsibility. For more information on formats and media, use a web browser: <http://www.cgia.state.nc.us/cost.html>
919-733-2090 (voice)
919-715-0725 (FAX)
dataq@cgia.state.nc.us