Tuesday, November 24, 2009

Address Submission Option

Addresses that are not found using the MAR Web Services Sample Client and which are located
along a valid address range on a street have the option of being submitted for review by
knowledgeable address specialists.

Go to the MAR Sample Client and type in the address in question and click submit. If the address is within a valid street address range, and it is not in the MAR an option will appear entitled 'Select this link to report a New Location or to change an existing location,' Click on the link and carefully fill in the form. Click 'Submit for Verification'. A member of the MAR Data Team will research the address and respond within a couple of business days.

Google Street Name Mess Up and Collabrative Mapping

View Larger Map

Some of the street names in Google Maps are incorrect. I found a couple of cases in the large development called Capitol Gateway.
  • There is no 17th Place SE here. It should be 57th Place SE
  • On the crescent shaped street near where it says 'McWilliams Ballard' it should be 57th Street SE (not 57th Place SE).
Fortunately, Google Maps has a very useful feature called 'Report a Problem' where users can submit inaccuracies found on their map. I took advantage of their noble feature and easily submitted these problems. Hopefully they will respond soon to my corrections. This 'Report a Problem' feature is an example of Collaborative Mapping.

Collaborative Mapping is important for the future of the Master Address Repository (MAR). The MAR allows collaboration when it comes to reporting missing addresses and residential units. In the future increased collaboration is the way to go.

P.S. Capital Gateway, themselves, also misplaced street names on their site plan.

Sunday, November 22, 2009

Why is the MAR Important?

  • The MAR has established a unified addressing standard. It allows the District Government to easily compare information about an address, block or intersection across databases and agencies.
  • Addressing standards are built into the MAR.
  • It has tools that allow for geocoding and information retrieval regarding addresses, intersections and blocks that enforce the standards.
  • MAR simplifies crosscutting queries by address within the DC Government.
Taken from the MAR Presentation (pdf)

Thursday, November 19, 2009

Problematic Addresses in the Integrated Tax System (ITS)

DC's Integrated Tax System (ITS) has thousands of incorrect and poorly formatted addresses for their properties. The Office of the Chief Financial Officer (OCFO) is responsible for the ITS and has been informed about significant problems with regarding to premise addresses in their database.

There are thousands of faulty records, some missing quadrants, incorrect street names, incorrect address numbers, missing premise addresses and more.

For an example go to: Search Real Property Assessment Database

Type in Square '0185' and Lot '0828' and then click 'Search Now' You will find that the Premise address field is missing the quadrant designation (it should be NW).

Below is an example where the ITS has incorrect addresses for four properties along 1400 block of 19th Street SE. In the image below the Master Address Repository (MAR) addresses are the green dots and the ITS addresses are the blue dots. It is clear from the image that their is a discrepancy between the MAR and the ITS regarding the proper locations of the addresses. In this case the MAR is correct. This has been confirmed by using USPS and Google Street View.

The ITS is one of many sources for the MAR. Unfortunately, some of the address errors in the ITS have infiltrated their way into the MAR. In the past few years, most of these address errors have been removed from the MAR. Now it is time for ITS to clean up their data.

Tuesday, November 17, 2009

NY Times Article on Collabrative Mapping

New York Times article on Collaborative Mapping. The article discusses the emerging field of collaborative mapping and how various organizations such as Google are taking advantage of it.

Collaborative mapping is important and there is much potential here. With regards to the MAR and collaborative mapping, the MAR Sample Client allow users to easily submit missing addresses or residential units. In the future the MAR will become more collaborative. This blog is meant as a way to reach out to users who are interested in collaborating with us or just learning more about the MAR.

Monday, November 16, 2009

Even and Odd Addresses

Even address numbers are assigned on the left side of the street as the numbers ascend. Odd numbers are assigned on the right side of the street as the numbers ascend. That is the side of the street is determined as one faces away from the US Capitol Building. Please see the below image from the Capitol Hill Neighborhood.

It should be noted that a very small percentage of addresses are not assigned that way and are thus considered address anomalies (large pdf).

Friday, November 13, 2009

Dakota Crossing

Dakota Crossing Development
The Dakota Crossing Development contains 202 townhouses located in the NE quadrant of Washington, DC. It sandwiched between South Dakota Avenue For, Lincoln Drive, 31st Place and 33rd Place NE. All the addresses in this development are in the Master Address Repository (MAR). The MAR data team has visited this site a few times to confirm addresses and the progress of the development. It is located in square 4325.

Tuesday, November 3, 2009

How are new addresses issued by DC Government?

The Department of Consumer and Regulatory Affairs (DCRA) is responsible for issuing new addresses. New addresses need to be approved by DCRA. DC GIS is tasked with maintaining the address database. DC GIS works closely with DCRA on address issues.

For more information about address applications please go to: DCRA Website

Monday, November 2, 2009

*** October 2009 Monthly MAR Report ***

Dataset Numbers:

  • Addresses: 141,827
  • Residential Units: 188,776
  • Aliases: 5,215
  • Street Name Alias: 1,022
  • Intersections: 16,382
  • Block: 15,825
  • Address / SSL Cross Reference Table: 235,456


  • The block & intersection table were updated

  • The MAR Frequently Asked Questions (FAQ) was expanded and reviewed. It is available on the MAR Website.

  • Working with Office of Unified Communications to help improve their addresses and place names in their Computer Aided Dispatch (CAD) for 911 and 311