system filename : rr24_100 approx. file size = 2.4 mb Revisions and updates to this layer include: 3) filename: rr24_1001298 - the December, 1998 release of this data was the first release as a statewide combined file. This file is a combination of the 24 k dlg data previously stored by quad tile, and the 100k statewide rail file from the 100k dlg data. 2) filename: rrt10098 This is the 100k rail only (superceded by the combined file) in the 83/sp/m projection. This was performed in 1998. This is a statewide file. 3) filename: rrt10087 The 1987 version was the first release of the 100k rail data. This is a statewide file.
US Geological Survey-National Mapping Division, 1987, onemap_prod.SDEADMIN.rr: US Geological Survey-National Mapping Division, Reston, Virginia.Online Links:
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.
| Range of values | |
|---|---|
| Minimum: | 23.828 |
| Maximum: | 60371.680 |
| Units: | meters |
| Resolution: | 0.001 |
| Formal codeset | |
|---|---|
| Codeset Name: | USGS DLG Codes |
| Codeset Source: | USGS Digital Cartographic Data Standards, circular 895-G |
Sequential unique whole numbers that are automatically generated.
| Formal codeset | |
|---|---|
| Codeset Name: | USGS DLG Codes |
| Codeset Source: | USGS Digital Cartographic Data Standards, circular 895-G |
| Value | Definition |
|---|---|
| 100000 | Source is 1:100,000-scale dlgs |
| 24,000 | Source is 1:24,000-scale dlgs |
Coordinates defining the features.
COLUMN ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - From node id 5 TNODE# 4 5 B - To node id 9 LPOLY# 4 5 B - Left poly id 13 RPOLY# 4 5 B - Right poly id 17 LENGTH 4 12 F 3 Length in meters 21 RR24_100# 4 5 B - Internal id 25 RR24_100-ID 4 5 B - Internal id 29 MAJOR1 6 6 I - USGS DLG code 35 MINOR1 6 6 I - USGS DLG code 41 SCALE 6 6 I - Base map scale
US Geological Survey (USGS) North Carolina Department of Transportation (NCDOT) NCCGIA Director, Karen Siderelis Database Administration, Zsolt Nagy Database Management, Ken Shaffer North Carolina Center for Geographic Information and Analysis Governor's Office Office of State Planning 301 North Wilmington Street, Suite 700 Raleigh, NC 27601-2825
(919)733-2090 (voice)
(919)715-0725 (FAX)
dataq@cgia.state.nc.us
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
U.S. Geological Survey or another mapping agency in cooperation with USGS., Unknown, The Topographic Map Names Data Base designation for the source quadrangle.: U.S. Geological Survey, Reston, Virginia.
Survey, US Geological , Unknown, Digital Line Graphs: US Geological Survey, Reston, Virginia.
Data sources used in this process:
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:
The digital line graphs (DLGs)for transportation - railroads were delineated on USGS 1:100,000-scale topographic maps and 1:24,000 scale topographic maps and attributed with USGS DLG codes. The digital files were supplied to NC CGIA who edits the attributes as changes occur. The two datasets were merged to fill in gaps that occured in both datasets allowing for a more complete statewide railroad coverage.
Features were delineated on USGS 30 x 60 Minute and 7.5 minute series topographic maps, which meet National Map Accuracy Standards. The DLGs were digitized and supplied to NC CGIA who converted them into ARC/INFO format. The data was projected, and features are added as changes occur.
These data represent transportation features for railroads, as determined by the US Geological Survey 1:100,000-scale Digital Line Graph program and 1:24,000-scale Digital Line Graph program. Each feature is attributed with various DLG codes. Data represent all known railroads at time of publication of sources.
Using ESRI's ARC/INFO GIS software, the data set was built for arc topology using the "build" command. Topology has not been edited since the last build.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Acknowledgement of products derived from this data set should cite the following: The source of the Transportation- Railroads (1:24,000/1:100,000) data is the North Carolina Corporate Geographic Database. Earlier versions of this dataset may exist. The user 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
Transportation- Railroads (1:24,000/1:100,000)
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 this data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.
FOR DIGITAL OR NON-DIGITAL DATA, Contact NC CGIA, Data Distribution to order data, Phone 919.733.2090 ... Email dataq@cgia.state.nc.us ... Web Page order form <http://www.cgia.state.nc.us/cgdb/index.html>
For current FORMAT/MEDIA INFORMATION, use a web browser: <http://www.cgia.state.nc.us/cost.html> or phone NC CGIA Data Distribution 919.733.2090
Data creation and large data analysis jobs contact Database Administration P:(919)733-2090. All data is available through standard ordering procedures on a cost recovery basis.
All formats supplied are created using ARC/INFO GIS software on Unix workstations. Other formats are available. Format compatibility is the user's responsibility. For more information on formats and media, use a web browser: FORMAT/MEDIA INFORMATION - <http://www.cgia.state.nc.us/cost.html>
(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@cgia.state.nc.us