Intersection Point locations. The dataset contains locations and attributes of Intersections, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. The Intersection Points - MAR is primarly derived from DC Department of Transportation's (DDOT) Intersection Table in their Street Spatial Database (SSD). Regular at grade intersections (TYPE = 'REGULAR') as well as overpasses (TYPE = 'OVERPASS'), underpasses (TYPE = 'UNDERPASS') and ramps (TYPE = 'RAMP') are included. The overpasses, underpasses and ramps are based on street centerlines from DDOT. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters. METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.
This data is used for the planning and management of Washington, D.C. by local government agencies.
publication date
Acknowledgment of the DC Geographic Information Systems Program (DC GIS). The District of Columbia Government makes no claims as to the completeness, accuracy or content of any data contained hereon, and makes no representation of any kind, including, but not limited to, the warranty of the accuracy or fitness for a particular use, nor are any such warranties to be implied or inferred with respect to the information or data furnished herein.
441 4th St NW, Suite 930 South
DDOT
Data believed to be complete and accurate, subject to change. Digital version compared with original source data for accuracy and completeness. Validated by source and/or responsible agency.
In process of validation by source and/or responsible agency.
Data believed to be complete and accurate, subject to change. Digital version compared with original source data for accuracy and completeness. Validated by source and/or responsible agency.
In process of validation by source and/or responsible agency.
N/A
locations and attributes
Data Collection: Most of the data is collected from DDOT's (DC Department of Transportation) Street Spatial Database (SSD). There is a table called intersection.
Data QA/QC After data preparation, the data team performs qa/qc. Various processes check the following parameters: 1.) spatial and attribute accuracy; 2.) data usability; 3.) data dictionary adherence; 4.) specialized metrics, such as connectivity and directionality; and 5.) data load success. These checks are, as follows: Visual - staff perform a structured visual check of the data, using on-screen, plotting, and customized routines, and, at times, comparing it to the source documents. Edge-matching - For grided datasets, staff review the spatial capture, connectivity, and attribution of data across tile boundaries, where applicable. Automated - Staff compare the data to documented standards and source files through automated procedures and reports. Specialized - Staff review more specific data parameters, such as directionality, connectivity, and topology. Edit Verification - Staff ensure that previous errors are fixed to specifications. Field Verification - Occasionally, through field work, team members compare the GIS data with the real world. Data Loading - Staff evaluate the success and evaluate the process of loading raw data into a structured database. Since most of the data use addresses as the spatial reference, staff compare the data against base layers (buildings, roads, street centerlines, owner-points, parks, and orthophotography) and move features where needed. In some cases, OCTO GIS personnel produce maps and reports for source agency review. Through an iterative process, staff modify and enhance the layer to agency specifications. For some datasets, the agency endorses the final product for data load and publication.
Dataset copied.
Metadata imported.
Reference X
ESRI
Reference Y
ESRI
Node Identifier
ESRI
Intersection identifier
Source
ESRI
Latitude value
ESRI
Longitude value
ESRI
Feature geometry.
ESRI
Feature geometry.
ESRI
Full intersection description
Master Address Repository Unique Identifier
Street 1 Identifier
Street 2 Identifier
Full intersection description 2
Full intersection name
Street Name 1
Street 1 Type
National grid coordinates
Street 1 Segment Identifier
Street 2 Segment Identifier
Street 1 Quadrant
Intersection type
Street 2 Name
Street 2 Type
Street 2 Quadrant
441 4th St NW, Suite 930 South
Acknowledgment of the DC Geographic Information Systems Program (DC GIS). The District of Columbia Government makes no claims as to the completeness, accuracy or content of any data contained hereon, and makes no representation of any kind, including, but not limited to, the warranty of the accuracy or fitness for a particular use, nor are any such warranties to be implied or inferred with respect to the information or data furnished herein.
Most DC GIS datasets can be downloaded from "http://dcgis.dc.gov" on the data center page. Orders can also be made by contacting OCTO GIS at "dcgis@dc.gov", especially for datasets not available for download.
441 4th St NW, Suite 930 South