The District of Columbia

Traffic Camera

Traffic Camera

by District Department of Transportation on 20110107

Keywords
About: transportation, traffic control, pavement marking, traffic cabinet, camera, traffic detector, traffic pole, push button, signal, signal arm, Manual of Uniform Traffic Controls, MUTCD, Transportation Operation Agency, TOA
Taking place at: Washington, D.C., DCGIS, DC GIS, District of Columbia, DC

Abstract

The dataset contains location and attributes of traffic controls located at each intersection in the District of Columbia. All traffic poles, pavement markings, traffic cabinets and cameras located within 10 meters of curb face intersections are collected. Poles must support traffic control devices in order to be collected. This includes traffic control signs, traffic signals, traffic arms and cameras. The data set does not include poles supporting only name plate signs and parking enforcement signs.

Purpose

This data is used for the planning and management of traffic controls - Assets, Activities, Incidents, as well as the maintenance of Traffic Pole Features of the District of Columbia, Department of Transportation (DDOT).

Access constraints

Contact DDOT / OCTO GIS. Any data obtained outside of DDOT / OCTO GIS are unauthorized copies.

Use constraints

Data cannot be redistributed in any manner without written authorization. DDOT-OSAT / OCTO 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.

Point of contact

Markos K. Yeterawork
in DC Department of Transportation, Operational Support and Applied Technology (OSAT) - Spatial Data Systems Division



phone: (202) 741-5391
fax: (202) 727-5660
hours: 8:30 am - 5 pm

Credits


District of Columbia, Department of Transportation.
Operational Support and Applied Technology (OSAT) - Spatial Data Systems.

Data accuracy

Accuracy

Mercado will achieve 95% attribute accuracy on a maximum 10% random sample in order for data to be deemed acceptable. Collected attributes will be evaluated against field conditions and the calculation of accuracy will be based on total countable collected attributes. TrafficPole attributes will be quality controlled to an accuracy of 95% based on each counted attribute receiving equal weight. Attributes collected are as follows:

PoleID
SteetJunctionID
StreetJunctionID
StreetSegID
PoleType
PoleMaterial
PoleHeight
PoleCondition
BaseType
IsPower
IsAPS
NoOfHeads
Picture

Logical consistency

Consistency of the data is manually checked by a GIS technician to test the accuracy of the data at the completion of each ward. For each PoleType there are typical attribute vallues. Mercado Consultants has developed a proccess for checking the logical consistency of the data. The select by attributes tool is used to select features whose attributes do not fall into typical values expected for a particular feature class. For example, PoleTypes labeled Streetlights typically have PoleHeights valued between 25' and 30'. Streetlights with PoleHeights with value greater the 30' or lesser then 25' are selected and checked against the pole's picture and adjecent poles.

See Process Description under the Process Step to understand how logical consistency is achieved for each Traffic Pole at each street intersection.

Completeness

Mercado Consultants, Inc. performed an inventory of traffic poles at each intersection within the District of Columbia. The inventory was conducted in all of the Washington DC. The TrafficPole inventory includes the following items:

The collection of assets' attribute information as described in the Attribute Accuracy section of the Data Quality tab.

The collection of sub-meter GPS on traffic controll assets as described in the Positional Accuracy section of the Data Quality tab.

A supplemental datat set indicates all StreetIntersectionIDs without assets and an explanation. This data set will provide a completeness report.

Horizontal positional accuracy

All traffic control assets are inventoried and placed relative to DDOT's source road network. The location of assets are established by using three different methods:

1. First, a sub-meter gps point is taken for each traffic pole with the exclusion of underpasses and tunnels. Each sub-meter gps point is stored in Trimble formatted .SSF files. The .SSF files are differentially corrected and exported to the NAD83 Maryland State Planes Meter coordinate system using Trimble's GPS Pathfinder Office software program.

2. In areas where a good satelite signal could not be established, locations are established from the intersection of two radial measurements from known locations on the existing DC planametrics.

3. GPS position are also established by digitizing the locations using 2008 Orthophotos.

Vertical positional accuracy
No elevation value was collected

Lineage / Sources

    Lineage / Processes
    Ryan Spielman
    in Mercado Consultants



    phone: 301 260 0090
    fax: 301 260 0018
    hours: 8:00am to 5:00pm
    Operating Procedures
    Safety
    At Mercado Consulting safety is very important. To this end, there will be a safety meeting every Monday to discuss safety issues that had arise during the previous week. It is required that every Mercado emloyee who goes out in the field wear a Safety Vest while working in the field.
    While out in the field we are a team. As such, we will look out for each coworker and warn them when they are performing an unsafe act.
    Driving
    To perform this survey, it is necessary to drive a company vehicle and sometimes it necessary to drive a privately owned vehicle. When driving a vehicle to perform this project it necessary to follow certain procedures.
    Mileage
    While driving a company vehicle or a privately owned vehicle it is important to document the miles driven for that day to perform work. If you are driving your own vehicle with proper permission you are authorized compensation for miles driven to perform the task for that day.
    Gas
    Print receipts when fueling company vehicles and return to project manager.
    Accident
    Report all accidents to the proper authorities.
    Metro
    Traffic tickets are not tolerated. Please pay attention to where you are parking when you are performing company business. If you park at a meter, please pay the amount needed to complete the job. You will be compensated for any money used to pay for metered parking and parking tickets.
    Metro
    At times when it is more convenient you may have to ride the Metro run by the Washington Metropolitan Association Transit Authority. In these times you will be handed a Smart trip Card to ride the metro and will be provided with money to reload this card if it is necessary.
    Team
    A team is usually 2 people: a Trimble Operator and a Rod Man. Remember you are team and act accordingly. We must look after each other when we are out in the field.
    Preparation for Work
    Before leaving the office, verify that you all of the equipment for work. This includes a Trimble Data Collector, Camera, Telescoping Rod, Clip Board, Barcodes, Barcode Scanner and Step Stool for each team. In the Clip Board, there should be enough work to complete a day's work. Everyone is required to have a safety vest and ID badge.
    Arrange Intersection
    Intersection should be arranged in a logical order prior to reaching the intersections being worked today.
    Order of Collecting Data
    You collect data by starting on the Northwest Corner (Corner 1. See field sheet) and work clockwise from there until the final piece of data is inputted. After data is collected, a video will be taken when necessary to get a view of the pavement markings.
    Numbering of Numbered Items
    Items that are number should follow that following numbering convention: odd numbers for the red Trimble and even numbers for the blue Trimble; for example the numbers should go from 3001-4000 and then 5001-6000 for the red Trimble while the blue Trimble would go from 4001-5000 and 6001-7000 respectively.

    Responsibilities
    Trimble Operator
    The Trimble Operator is responsible for establish GPS position for each asset and filling out their corresponding attributes.
    Input Data in Trimble
    The main data of the Trimble Operator is to collect information on the Trimble data collector. The information that is collected except for pavement marking will be collected on the Trimble data collector. The information that will vary depending on the type of information collected.
    Set up Trimble Geo XT
    In order to use the Trimble, you must locate yourself on the map. In the Trimble, there is a GPS receiver. The GPS receiver generally works but there are limitations such as it takes up to 15 minutes for the receiver to locate you on the map. If possible, you should try to find your location on the map before you the receiver finds your location and confirm it when the receiver finds your location.
    Once the GPS receiver has found your position, you can use the GPS receiver to plot your point by placing the point on the brown "x" that represent you location or using the auto plot point feature which requires you to stand next to the feature that is being plotted until 20 satellite signals are received.
    Data Collections
    It is the responsibility for the Trimble Operator to input data for the following Traffic Controls: Pole, Sign, Signal, Signal Arm, Cabinet, Push Button, and Camera.
    Traffic Pole
    When inputting Poles the following data is needed: Pole ID, Pole Type, Pole Material, Base Type, Pole Height, Number of Heads, and Picture.
    Pole ID
    Pole ID is auto-incremented but in some cases these numbers will have to be manually inputted.
    Pole Type
    For Pole Types you are given a pull down menu that include the following choices: Sign Support, Street Light, Decorative, Signal, Combo, Utility and other. A full of the various pole types are given in glossary of terms.
    Pole Material
    For Pole Materials you are given a pull down menu that includes the following choices: Metal, Wood, Plastic, Aluminum, and Poly Tech. Generally pole materials are self explanatory. The only exceptions are Aluminum and Poly Tech. These poles look like metal poles but are not magnetic. You can check to see if you these poles are not metal by using the magnet at the end of the given tape measure.
    Base Type
    Base Type is either T-Base, Temporary or does not apply. T-Base or Temporary only applies to Street Light, Signal, and Combo Poles. All other poles does not apply is the appropriate input for Base Type. A description of Base Type is in the glossary of terms.
    Pole Height
    The pole height should be measured to nearest foot and inputted in at that amount.
    Number of Heads
    For Signal and Combo Poles it is necessary to apply the appropriate number of traffic signals that are on the particular pole. This also includes Decorative poles that have Traffic Signals as well.

    Picture
    Picture ID is determined by the camera and entered into the data collector.
    Traffic Sign
    When inputting signs the following data is needed: Sign ID, Pole ID, Sign Category, Sign Name, Sign Dimension, Sign Height, and Pole Type.
    Sign ID
    Sign ID is auto-incremented but in some cases these numbers will have to be manually inputted. It is important that the Sign ID matches the end digits of the Barcode affixed to the sign. If it does not, the Sign ID needs to be changed to match the Barcode.
    Pole ID
    Pole ID should match the Pole ID of the pole the sign is affixed.
    Sign Category
    The sign categories are as follow: Regulatory, Stop/Prohibition, Pedestrian, Warning, School, and Guidance/Directional. Pick the appropriate category from the drop down menu.
    Sign Name
    Sign name are inputted as the code given to signs in the Manual on Uniform Traffic Devices (MUTCD). If the name is unknown, then leave the Sign Name blank.
    Sign Height
    The sign height should be measured to nearest tenth of foot and inputted in at that amount. If the Signal is affixed to a Signal Arm, the height of the Signal is the height of the Signal Arm.
    Pole Description
    Normally Pole Description is N/A except if it is a Sign Support. In the case of Sign Support, you will need to input Pole Description as U-Channel, Round, Square, or Impact Recovery
    Picture
    Picture ID is determined by the camera and entered into the data collector.
    Traffic Signals
    When inputting Signals the following data is needed: Signal ID, Pole ID, Signal Arm ID, Signal Type, Signal Height, and Number of Section.
    Signal ID
    Signal ID is auto-incremented but in some cases these numbers will have to be manually inputted.
    Pole ID
    Pole ID should match the Pole ID of the pole the signal is affixed.
    Signal Arm ID
    If the Signal is on a Signal Arm, input the appropriate Signal Arm.
    Signal Height
    The signal height should be measured to nearest tenth of foot and inputted in at that amount.
    Number of Sections
    Enter the number of section that the signal has.
    Traffic Signal Arms
    When inputting Signal Arms the following data is needed: Signal Arm ID, Pole ID, Signal Arm Length, Signal Arm Material, Signal Arm Height, and Number of Heads.
    Signal Arm ID
    Signal Arm ID is auto-incremented but in some cases these numbers will have to be manually inputted.
    Pole ID
    Pole ID should match the Pole ID of the pole the Signal Arm is affixed.
    Signal Arm Length
    Input the length the Signal Arm extends from the pole.

    Signal Arm Material
    Input the material of the Signal Arm.
    Signal Height
    The Signal Arm height should be measured to nearest tenth of foot and inputted in at that amount.
    Number of Heads
    Input the number of Signals affixed to the Signal Arm.

    Traffic Push Buttons
    When inputting Push Buttons the following data is needed: Push Button ID, Push Button Height, and Pole ID.
    Push Button ID
    Push Button ID is auto-incremented but in some cases these numbers will have to be manually inputted.
    Push Button Height
    The Push Button height should be measured to nearest foot and inputted in at that amount.
    Pole ID
    Pole ID should match the Pole ID of the pole the Push Button is affixed.


    Traffic Cameras
    When inputting Cameras the following data is needed: Camera ID, Pole ID, Camera Type, and Camera Owner.
    Camera ID
    Camera ID is auto-incremented but in some cases these numbers will have to be manually inputted.
    Pole ID
    Pole ID should match the Pole ID of the pole the Camera is affixed.
    Camera Type
    Choose from CCTV, Red Light and Speed.
    Camera Owner
    Choose from DDOT, DC Police and Secret Service.
    Traffic Cabinets
    When inputting Cabinets the following data is needed: Cabinet ID, and Cabinet Type.
    Cabinet ID
    Cabinet ID is auto-incremented but in some cases these numbers will have to be manually inputted.
    Cabinet Type
    Input the Cabinet Type: 336s, or 336ss. The difference between the two is the height. If the height of the Cabinet is taller than an average man's shoulder, then the type is 336ss; otherwise the type is 336s.
    Verify Barcode match signs.
    The Trimble Operator has to verify the barcode is at the bottom, left-hand corner and match the Sign ID in the Trimble. If the there is no Barcode on sign, alert the Rod Man.
    Assist the Rod man when necessary.
    If you finished your assigned duties, you should help the Rod Man where you can.

    Rodman
    The Rod Man job is to collect the data that the Trimble Operator is inputting in the Data Collector.
    Measurements
    Measurements should be measured bottom for all data that is collected from the pole and should be written down on the pole or ground along with the pole ID.
    Pictures
    For every pole and sign that is entered into the data collector, there should be a picture. These pictures should be taken bottom to top within the minute of the pole picture being taken.
    Pole
    The pole picture should include everything that is on the pole such as base, picture, push button, camera and signs. After each pole picture, the picture time should be written down.
    Signs
    The sign picture should be taken of the sign. After the sign picture is taken, a barcode should be placed on the back of the sign in the lower left hand corner.
    Drawing Pavement Markings
    The pavement markings should be drawn as exactly seen on the ground on the orthographic sheet. It should be noted whether tape is showing or the color is other than white. Mark the tape lines as tape and lines that other than white as the color they are.(See field sheet)
    Drawing Poles
    Poles must be drawn on the data sheet where the pole is located noting the Pole ID. (See field sheet)
    Video
    When you take the video, you must video tape the worksheet first. After videotaping the worksheet, you go from corner to corner videotaping the pavement noting what corner you are on and the pavement markings you see. If you see taped lines, you must zoom into the line and mention that it is tape.
    Checking Numbers
    Check the numbers with the Trimble operator to make sure the numbers are correct. The numbers that are being checked are Pole ID, Sign ID, Signal ID, Arm ID, Push Button ID, Traffic Cabinet ID, and Camera ID. (See field sheet)

    Distribution

    Contact DDOT/TSA

    Distribution liability
    DDOT (OSAT) / OCTO 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. Subject to terms and conditions of the Memorandum of Agreement. Memorandum of Agreement must have authorized signature.

    Distributed by
    Markos K. Yeterawork
    in D.C. Department of Transportation. Operation Support and Applied Technology (OSAT) - Spatial Systems Division



    phone: (202) 671 2123
    fax: (202) 727-5660
    hours: 8:30 am - 5 pm

    Entity

    Traffic Camera / DDOTGIS
    TrafficCamera is the point geometry that represents DDOT traffic cameras.

    Attributes

    • CameraType / ESRI
      Internal feature number.
    • POLEID / ESRI
      Internal feature number.
    • FACILITYID
    • CAMERAID / ESRI
      Feature geometry.
    • FacilityID / ESRI
      Internal feature number.
    • CAMERATYPE
    • OWNER / ESRI
      Feature geometry.
    • PoleID / Mercado Consultants
      TrafficPole feature unique traffic pole id that may support the camera
      • Whole number / Unique sequential number generated by Terrasync software on Trimble XT
      •  
    • CameraID / ESRI
      Feature geometry.
    • Owner
    • SHAPE / ESRI
      Feature geometry.

    Metadata

    FGDC Content Standards for Digital Geospatial Metadata / FGDC-STD-001-1998 as of 20110210

    Provided by
    Markos K. Yeterawork
    in DC Department of Transportation, Operational Support and Applied Technology (OSAT) - Spatial Data Systems Division


    REQUIRED: The city of the address. REQUIRED: The state or province of the address., REQUIRED: The ZIP or other postal code of the address.,

    phone: (202) 741-5391
    fax: (202) 727-5660
    hours: 8:30 am - 5 pm