TIGER/Line Shapefile, 2014, county, Calaveras County, CA, All Roads County-based Shapefile
Dataset Identification:
Resource Abstract:
The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information
from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER)
Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line
shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. The All
Roads Shapefile includes all features within the MTDB Super Class "Road/Path Features" distinguished where the MAF/TIGER Feature
Classification Code (MTFCC) for the feature in MTDB that begins with "S". This includes all primary, secondary, local neighborhood,
and rural roads, city streets, vehicular trails (4wd), ramps, service drives, alleys, parking lot roads, private roads for
service vehicles (logging, oil fields, ranches, etc.), bike paths or trails, bridle/horse paths, walkways/pedestrian trails,
and stairways.
Citation
Title TIGER/Line Shapefile, 2014, county, Calaveras County, CA, All Roads County-based Shapefile
alternateTitle
National Geospatial Data Asset (NGDA) All Roads County-based Shapefile
Title ANSI INCITS 38:2009 (Formerly FIPS 5-2), ANSI INCITS 31:2009 (Formerly FIPS 6-4),ANSI INCITS 454:2009 (Formerly FIPS 8-6),
ANSI INCITS 455:2009(Formerly FIPS 9-1), ANSI INCITS 446:2008 (Geographic Names Information System (GNIS))
Theme keywords (theme):
Transportation Theme
National Geospatial Data Asset
NGDA
thesaurus name >
Title NGDA Portfolio Themes
revision Date
2010-02-01
other Citation Details
http://www.fgdc.gov/initiatives/resources/2013-2-1-ngda-data-themes-fgdc-sc-revised.pdf
other Citation Details
Cinergi keyword enhanced at Sun Nov 13 08:44:10 UTC 2016
purpose:
In order for others to use the information in the Census MAF/TIGER database in a geographic information system (GIS) or for
other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line
Shapefiles.
Resource language:
eng
Character set encoding of resource:
8859part1
Resource Maintenance Information
maintenance or update frequency:
notPlanned
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
use constraint:
otherRestrictions
Other constraints
Access Constraints: None
Other constraints
Use Constraints:The TIGER/Line Shapefile products are not copyrighted however TIGER/Line and Census TIGER are registered trademarks
of the U.S. Census Bureau. These products are free to use in a product or publication, however acknowledgement must be given
to the U.S. Census Bureau as the source. The horizontal spatial accuracy information present in these files is provided for
the purposes of statistical analysis and census operations only. No warranty, expressed or implied is made with regard to
the accuracy of the spatial accuracy, and no liability is assumed by the U.S. Government in general or the U.S. Census Bureau,
specifically as to the spatial or attribute accuracy of the data. The TIGER/Line Shapefiles may not be suitable for high-precision
measurement applications such as engineering problems, property transfers, or other uses that might require highly accurate
measurements of the earth's surface.Coordinates in the TIGER/Line shapefiles have six implied decimal places, but the positional
accuracy of these coordinates is not as great as the six decimal places suggest.
Spatial representation type code:
vector
Processing environment:
The TIGER/Line shapefiles contain geographic data only and do not include display mapping software or statistical data. For
information on how to use the TIGER/Line shapefile data with specific software package users shall contact the company that
produced the software.
description TIGER/Line Shapefiles are extracted from the Census MAF/TIGER database by nation, state, county, and entity. Census MAF/TIGER
data for all of the aforementioned geographic entities are then distributed among the shapefiles each containing attributes
for line, polygon, or landmark geographic data.
source
source description
online
source citation
Title MAF/TIGER
revision Date
2014
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy
measure Description
The Census Bureau uses root mean square error (RMSE) as stated in the FGDC-STD-007. 3-1998, Geospatial Positioning Accuracy
Standards, Part 3: National Standard for Spatial Data Accuracy.
evaluation Method Description
The Census Bureau uses Global Positioning System (GPS) coordinates at road centerline intersections to evaluate the horizontal
spatial accuracy of source files that may be used to realign road features in the MAF/TIGER database and test the horizontal
spatial accuracy of the road features in the TIGER/Line Shapefiles. The test compares a survey-grade GPS coordinate to its
associated road centerline intersection in the TIGER/Line Shapefiles. The test is based on an independent collection of GPS
coordinates for a random sample of road intersections from a centerline file that meet certain criteria. The points are referred
to as the sample points and are gathered through a private contractor working for the Census Bureau. Since the collection
method uses survey-quality GPS-based field techniques, the resulting control points are considered 'ground truth' against
which the TIGER road centerline intersection coordinates are compared. The distances between the coordinates are calculated
and the Census Bureau determines the Circular Error 95% (CE95). That is, the accuracy of the file in meters with 95% confidence.
The CE95 can be calculated from the mean and standard deviation by using the formula: mean of differences plus (2.65 times
the standard deviation). CE95 results reported for each file tested are determined using a spreadsheet with embedded statistical
formula. The use and applicability of the spreadsheet and its embedded formula have been verified by Census Bureau statisticians.
The basis of the calculation is the use of the root mean square error (RMSE). This is the method as stated in the U.S. Government's
Federal Geographic Data Committee Standard FGDC-STD-007.3-1998, Geospatial Positioning Accuracy Standards. Part 3: National
Standard for Spatial Data Accuracy. The results of using this measure of accuracy are in compliance with Federal Spatial Data
requirements. In terms of the Census Bureau application, the dataset coordinate values are those taken from the centerline
file and the coordinate values from an independent source of higher accuracy are those acquired through the Census Bureau's
contractor. Please note that the horizontal spatial accuracy, where reported, refers only to the realigned road features identified
as matched to the positionally accurate source file with that accuracy. It is not the spatial accuracy of the TIGER/Line Shapefile
as a whole.
Quantitative Result
result value 4.623 meters for 11313
value Units
Completeness Commission
Completeness Omission
evaluation Method Description
Data completeness of the TIGER/Line Shapefiles reflects the contents of the Census MAF/TIGER database at the time the TIGER/Line
Shapefiles were created.
ConceptualConsistency
measure Description
There may be some inconsistencies in feature names along features. An anomaly exists with the sporadic occurrence of road
segments comprising a complete chain with different MAF/TIGER Feature Census Class Code (MTFCC) values assigned. This problem
could affect applications that use the MTFCC values for network analysis, routing, or for assigning symbology to a feature
when creating a map. The Census Bureau performed automated tests to ensure logical consistency and limits of shapefiles. Node/geometry
and topology relationships are collected or generated to satisfy topological edit requirements. These requirements include:
(1) Complete chains must begin and end at nodes. (2) Complete chains must connect to each other at nodes. (3) Complete chains
do not extend through nodes. (4) Left and right polygons are defined for each complete chain element and are consistent throughout
the extract process. (5) The chains representing the limits of the files are free of gaps.
fees The online copy of the TIGER/Line Shapefiles may be accessed without charge.
Ordering Instructions
To obtain more information about ordering TIGER/Line Shapefiles visit http://www.census.gov/geo/www/tiger
Format
Format name TGRSHP (compressed)
Format version
file Decompression Technique
The TIGER/Line shapefiles contain geographic data only and do not include display mapping software or statistical data. For
information on how to use the TIGER/Line shapefile data with specific software package users shall contact the company that
produced the software.