The data was created and provided by TeleAtlas North America through a StratMap contract., Unknown, SDETrims.DBO.Trans_Roads.Online Links:
- Service=sde:sqlserver:CHUCKNORRIS; Database=SDETrims; Version=dbo.DEFAULT
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.
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.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
512-463-8337 (voice)
512-463-7274 (FAX)
stratmap@tnris.state.tx.us
The primary purpose of the StratMap Phase 2 Transportation Layer is for cartographic and basemap functionality. The layer remains in the public domain and serves as a seamless transportation layer for emergency response and recovery, site location, and general mapping.
Data sources used in this process: M:\TNRIS-StratMap\TeleAtlas_TX\Metadata\TANA_metadata_FINAL.xml
Data sources used in this process:
Stratmap street segments allow for six implied decimal places of precision. While minimum accuracy is consistent with 1990 TIGER/Line(R) files, accuracy is dependent on geographic area and sources used to update those areas. Realignment priority was given to 8 counties (Coryell, Jim Hogg, Kendall, Nacogdoches, Panola, Starr, Tom Green, and Zapata).
Tests are performed for invalid names, Feature Class Codes and characters. Tests are constantly running on the Tele Atlas(R) database to ensure segment topology meets Tele Atlas(R) specifications. The Streets layer is not generalized.
All street segments in the Tele Atlas(R) database with an FCC = A* are considered. A74 (driveways) and A75 (parking areas) are not selected. After processing, the dataset is checked for drawing display, correct number of records, record schema consistency with specifications, correct file naming, file sizes and a comparison check with the contents of the Tele Atlas(R) database at the time of creation.
Street data is crosschecked and verified using numerous independent mapping sources. More than 500 algorithmic QC checks are applied against the database to ensure that changes to geography and attribution conform to the Tele Atlas(R) internal Database Feature Modeling Specifications.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- The StratMap transportation layer is organized by county in both ESRI 9.x Personal GeoDatabase and Shapefile formats. The layer is available for free at www.tnris.state.tx.us, or can be purchased on CD. Contact TNRIS for more information.
- Use_Constraints:
- StratMap does not warrant this data for any particular use and is not responsible for any damages resulting from the use of the data. Users of the layer should be aware that (1) StratMap data are not authoritative representations of boundaries derived from transportation features, (2) StratMap transportation lines are subject to change and corrections, (3) StratMap transportation was generated from the best available data which is subject to change, and (4) StratMap is updating transportation data and has a process for collecting and noting transportation changes. Contact StratMap for more details. Acknowledgement of the StratMap program is appreciated in products derived and used from the data.
512-463-8337 (voice)
512-463-7274 (FAX)
Downloadable Data
No warranty, expressed or implied, is made and no liability is assumed by TNRIS as to the positional or attribute accuracy of the data. The act of distribution shall not constitute any such warranty and no responsibility is assumed by TNRIS in the use of these files.
StratMap data is downloadable, and is also avaible by CD. Contact TNRIS for details. Data is available at no charge online: www.tnris.state.tx.us
512-469-8337 (voice)
512-463-7274 (FAX)
stratmap@tnris.state.tx.us