Identification Information

Title 2010, Los Alamos County, NM, Linear Hydrography

Date 2011-06-06

Date Type Publication

Cited Responsible Party

Organization Name U.S. Department of Commerce, U.S. Census Bureau, Geography Division

Role identify

Presentation Form vector digital data

Abstract The TIGER/Line Files are shapefiles and related database files (.dbf) that 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 File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Linear Water Features includes single-line drainage water features and artificial path features that run through double-line drainage features such as rivers and streams, and serve as a linear representation of these features. The artificial path features may correspond to those in the USGS National Hydrographic Dataset (NHD). However, in many cases the features do not match NHD equivalent feature and will not carry the NHD metadata codes. These features have a MAF/TIGER Feature Classification Code (MTFCC) beginning with an "H" to indicate the super class of Hydrographic Features.

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.

Status Complete

Point of Contact

Individual Name

Organization Name U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Branch

Position Name

Role Point of contact

Voice 301-763-1128

Facsimile 301-763-4710

Address

Delivery Point 4600 Silver Hill Road, Stop 7400
City Washington
Administrative Area DC
Postal Code 20233-7400
Country United States

Electronic Mail Address geo.tiger@census.gov

Maintenance and Update Frequency TIGER/Line Shapefiles are extracted from the Census MAF/TIGER database. No changes or updates will be made to this version of the TIGER/Line Shapefiles. Future releases of TIGER/Line Shapefiles will reflect updates made to the Census MAF/TIGER database.

Descriptive Keywords County or equivalent entity, Linear, Feature, Hydrography

Access Constraints None

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 boundary information in the TIGER/Line Shapefiles are for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes does not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.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. The data are free from Title 13 restrictions.

Language English

Topic Category inlandWaters

Extent

Geographic Bounding Box

West Bound -106.413108
East Bound -106.171708
North Bound 35.973243
South Bound 35.755724

Temporal Extent

Beginning Position 2010-01
Ending Position 2010-07

Data Quality Information

Attribute Accuracy Report

Report Accurate against Federal Information Processing Standards (FIPS), FIPS Publication 6-4, and FIPS-55 at the 100% level for the codes and base names. The remaining attribute information has been examined but has not been fully tested for accuracy.

Quantitative Attribute Accuracy Assessment

Attribute Accuracy Value
Attribute Accuracy Explanation

Horizontal Positional Accuracy Report

Report 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 Horizontal Positional Accuracy Assessment

Horizontal Positional Accuracy Value 6.435
Horizontal Positional Accuracy Explanation 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.

Logical Consistency Report 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.

Completeness Report 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.

Lineage

Source Information

Source Citation

Source Scale Denominator

Type of Source Media online

Source Time Period of Content

Beginning Position 2010-01
Ending Position 2010-07
Source Currentness Reference publication date

Source Citation Abbreviation MAF/TIGER

Source Contribution The selected geographic and cartographic information (line segments) are derived from the U.S. Census Bureau's Master Address File Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Internet Download

Source Time Period of Content

Beginning Position 2001-06-01
Ending Position 2001-06-01
Source Currentness Reference Publication Date

Source Citation Abbreviation None

Source Contribution Coordinates to realign selected hydrographic features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Internet Download

Source Time Period of Content

Beginning Position 2002-10-01
Ending Position 2002-10-01
Source Currentness Reference Ground Condition

Source Citation Abbreviation Unknown

Source Contribution Coordinates to realign selected road features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Unknown

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation None1

Source Contribution Coordinates to realign selected hydrographic features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Internet Download

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation 507 NHD

Source Contribution Coordinates to realign selected hydrographic features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Internet Download

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation 817 NHD

Source Contribution Coordinates to realign selected hydrographic features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media CD-ROM

Source Time Period of Content

Beginning Position 2002-01-01
Ending Position 2002-01-01
Source Currentness Reference 20020101

Source Citation Abbreviation DOQQ

Source Contribution Coordinates to realign selected road features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Internet Download

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation 5703 NHD

Source Contribution Coordinates to realign selected hydrographic features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media FTP

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Publication Date

Source Citation Abbreviation SFGIS

Source Contribution Coordinates to realign selected road features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Unknown

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation Harris

Source Contribution Coordinates to realign selected road features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Unknown

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation GPS

Source Contribution Coordinates to realign selected road features in the Census MAF/TIGER database.

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Unknown

Source Time Period of Content

Beginning Position Unknown
Ending Position Unknown
Source Currentness Reference Unknown

Source Citation Abbreviation Census

Source Contribution Coordinates to realign selected road features in the Census MAF/TIGER database.

Process Step

Process 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 Used Citation Abbreviation MAF/TIGER
Process Date 2010
Process Time
Process Contact

2010, Los Alamos County, NM, Linear Hydrography

Metadata from the RGIS Metadata Repository

Identification Information

Distribution Information

Spatial Reference Information

Data Quality Information

Metadata Reference Information