The District of Columbia

OwnerPLY

OwnerPLY

by Department of Consumer of Regulatory Affairs (DCRA) - Office of the Surveyor (OS) on Weekly

Keywords
About: Property, location, Lot, Land, Cadastral, Square
Taking place at: Washington, D.C., District of Columbia, DC, DC GIS, DCGIS

Abstract

Owner polygons. The dataset contains locations and attributes of owner polygons, 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 tax information (attribution) comes from OTR's Public Extract file. The creation of this layer is automated, occurs weekly, and uses the most currently available tax information. The date of the extract can be found in the EXTRACTDATfield in this layer.

Please visit http://vpm.dc.gov/ for additional information.

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.

Purpose

This data is used for the planning and management of land within Washington, D.C. by local government agencies.

Access constraints

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

Use constraints

Data cannot be redistributed in any manner without written authorization. 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

GIS Data Coordinator
in Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

fax: 202-727-5660
hours: 8:30am - 5:30pm

Credits

Department of Consumer of Regulatory Affairs (DCRA) - Office of the Surveyor (OS), and Office of Tax and Revenue (OTR) - Real Property Tax Administration (RPTA)
Office of Chief Technology Officer (OCTO) - DC GIS

Data accuracy

Accuracy
Validated by source and/or responsible agency

Logical consistency
Vector Property Map QA/QC

1.) Specifications:

Projection Parameters: Coord. System - NAD83, StatePlane, MD, FIPS 1900, meters.
Correct Extent and Mapping Tolerances:
Mapping tolerances implicitly define accuracy and precision of the vector feature datasets.
Min X: 389000, Max X: 408000, Min Y: 124700, Max Y: 147900
Precision: 92563.95 (close to 5 decimals of precision)
Cluster Tolerance: .003048006

2.) QA/QC Steps

Attribute Verification - Database Structure, Domain Values, Field Population
Topological Consistency - Verified Topology against a list of rules, as follows:

Source Checks
Squares were reviewed against their respective source documents (Record Lots- Subdivision Plats, Tax Lots- A&T Plats) and checked for the following:

- Ensure all lots were captured for each square
- Check all lot line dimensions and square footages
- Check for missing building restriction lines on original source plats
- Check for proper lot bearings
- Insure correct units were captured

Squares and Lots Best Fit - Check each squares best fit against the 2002 imagery and ground level features such as curb, sidewalk and buildings.

Errors found during DC QC process were cycled back to vendor until all correction had been completed.

Completeness
Data is mostly complete thru April 2008. There are approximately 80 squares with remaining transactions that need to be completed to bring the entire dataset current thru this date.

The following issues exist in the property data:

1.) Some squares contain COGO linework entered using degress, minutes, and seconds, as opposed to decimal degrees. This causes spatial inaccuracies that grow as the length of the line gets longer.
2.) Squares with alley/street closings/dedication transactions are currently being processed.
3.) Not all Parcels that reside outside of a Square(s) boundary have been processed/created.
4.) Not all Reservations have been processed/created.
5.) Individual edits that still need to be made are contained in the transaction table (VPM_Updates) which is available on DC Central's geospatial database.

Other
1.) Alleys, Building restriction lines, Highway Plans, and Easements are captured if they were on the source material. Source material is active as of November 2002. It is known that not all of these features were captured.
2.) Street width is approximate. Users should rely on the published official street widths to set up property lines or determine right-of-way (this is from the DC Land Surveyors Hand Book). Likewise this should be taking into consideration when doing certain types of GIS analysis utilizing the VP data.
3.) Some Squares are divided by streets. That is, the same Square continues on the other side of the street.
4.) Not all of the fields are currently populated. The remainder of the attribution will be populated once the servers are returned from the vendor containing the source files.
5.) Efforts are being made to bring all layers current.

Horizontal positional accuracy
Since squares are islands and not generated from ground features, staff "best fit" each square to the Earth. Since there is no citywide Survey Coordinate System, squares are placed in their approximate location. Once a square was COGO'ed/created it became a "floating islands" without geographic positioning. Because of this, captured property data had to be positioned relative to other geospatial files that themselves are geo-referenced. Thus, they were fit to the digital ortho's and planimetrics compiled at a scale of 1:100 or 1" ='s 83.3ft.
Squares were visually positioned over the appropriate area in of the orthophoto and planimetrics (ground level feature were primary source).

For the "best fit" to ortho, 95% of features are within 2 meters of their true position on the 2002 orthophoto.

Within a square, the property map relative accuracy is approximately 2 feet.

- Each Square is an Island, alone unto itself.

- Street width is approximate. The published official street widths to set up property lines or determine right-of-way are correct. There is digital scan information available from DDOT regarding Right-of-Way widths.

Vertical positional accuracy
N/A

Lineage / Sources

  • subdivision map
    hardcopy, location
    subdivision maps
    by Department of Consumer and Regulatory Affairs - Office of Surveyor, 2006
  • Assessment and Taxation plats
    hardcopy map, location
    Assessment and Taxation plats
    by Office of the Chief Financial Officer - Real Property Tax Administration, 2006
Lineage / Processes
GIS Data Coordinator
in Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

fax: 202-727-5660
hours: 8:30am - 5:30pm
Another owner polygon was generated with the release of updated vector property map layers. The following items were done on the vector property map layers:

-Corrections to some data anomalies

-Approx. 283 of the 800 maintenance transactions completed to bring data current. This equates to the retiring of 614 tax and record lots (these are in the history feature classes) and the creation of 364 new tax and record lots.

- 49 new Parcels

-Updated Maintenance transaction table
Metadata imported. Updated with Jan 04, 2008 Vector Property data
Metadata imported. Updated with May 22, 2008 Vector Property data
Metadata imported. Updated with August 01, 2008 Vector Property data
Recent updates include:
- Creation of 667 new Record Lots, Retiring of 202 Record Lots
- Creation of 167 new Tax Lots, Retiring of 18 Tax Lots
- Creation of 4 new Air Rights Lots, Retiring of 1 Air Rights Lot
- Corrections to data anomalies.
- Updated Metadata
- 16 Squares and their lots have been adjusted to better fit planimetrics.
(0374, 1194, 1195, 2852, 5318, 5320, 5880, 5881, 5882, 5883, 5885, 5890, and 5956)
- Several squares boundaries have been altered significantly because of incoming subdivisions; they include 5880, 5881, 5882, 5883, 5885, and 5890
- 3 new squares have been created because of incoming subdivisions, they are - 5881S, 5882W, and 5882E
Updated with October 3, 2008 Vector Property data using a 9/21/08 OTR Public Extract File
- Creation of 514 new Record Lots, Retiring of 621 Record Lots
- Creation of 201 new Tax Lots, Retiring of 188 Tax Lots
- Creation of 16 new Air Rights Lots
- Creation of 19 new Reservation Lots
- Retiring of 8 Parcel Lots
- Creation of 17 Alley or Street Closures
- Corrections to data anomalies
- Updated Metadata
- 13 Squares and their contained features have been adjusted to better fit planimetrics.
(0038, 0076, 0390, 0391, 0414, 0415, 0438, 0439, 0439-S, 0574, 5159, 5162, and 5643).
- 6 Squares boundaries have been altered significantly because of incoming subdivisions (0705, 0767, 0768, 0769, 0771, and 0798).
- 5 Squares and Lots have been retired do to incoming subdivisions (0702, 0703, 0704, 0706, and 0802).
Updated with January 23, 2009 Vector Property data using a 01/26/09 OTR Public Extract File
Updated with March 27, 2009 Vector Property data using a 03/22/09 OTR Public Extract File
Tax Assessment attribution for this layer was conflated from the most recent OTR Public Extract dated 04/26/09.
Tax Assessment attribution for this layer was conflated from the most recent OTR Public Extract dated 05/23/09.
Tax Assessment attribution for this layer was conflated from the most recent OTR Public Extract dated 06/28/09.
Tax Assessment attribution for this layer was conflated from the most recent OTR Public Extract dated 11/28/09.

Distribution

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.

Distribution liability
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
GIS Data Coordinator
in DC Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

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

Entity

OwnerPLY

Attributes

  • SHAPE_LEN / ESRI
    Internal feature number.
  • PY10CR / ESRI
    Internal feature number.
  • Shape / ESRI
    Feature geometry
  • OBJECTID / ESRI
    Internal feature number.
  • SQUAREPLYI
  • RESERVATIO
  • PARCELPLYI
  • TAXLOTSPLY
  • RECORDLOTS / ESRI
    Feature geometry.
  • SHAPE / ESRI
    Feature geometry.
  • GIS_ID
    OCTO GIS Identifier
  • RECORDATIO
  • SQUARE
    Square value from the SSL identifier.
  • SUFFIX
    Suffix value from the SSL identifier.
  • LOT
    The Lot value of SSL identifier.
  • LOT_TYPE
    Denotes the type of lot.
    • 1 / Record Lot
    • 2 / Tax Lot
    • 3 / Air Rights
    • 4 / Reservation
    • 5 / Appropriation
    • 6 / Parcel Lot
    •  
  • PY10BAL
  • RES
  • ADDRESS_ID
    Address Identifier
  • IS_THEORET
  • IS_REAR_OF
    Lot is Rear Of Code
  • BLDG_NUM
    Building Number
  • COL
    Part of common ownership layer
  • UNDERLIES_
  • CONDO_REGI
  • CONDO_BOOK
  • CONDO_PAGE
  • RECORD_ARE
  • COMPUTED_A
  • SURVEYED_A
  • QUADRANT
    DC Quadrant Value
  • BLDG_NUM_E
  • BLDG_NUM_1
  • BLDG_EXT_E
  • CONV_TOLER
  • CONV_TOL_1
  • CONV_TOL_2
  • EFFECTIVET
  • ZIP5
    Zip Code
  • ZIP4
    Zip + 4 Value
  • BOOK_NUM
    Book Number
  • ACCOUNT_ID
    Acoount identifier
  • PAR
    Parcel Number
  • OF_LOT_SEQ
    Of Lot Sequence Number
  • ARN
  • ASRNAME
  • PROPTYPE
  • TRIGROUP
  • USECODE
  • LANDAREA
  • PRMSWARD
  • PREMISEADD
  • NBHD
  • NBHDNAME
  • SUBNBHD
  • UNITNUMBER
  • OWNERNAME
  • CAREOFNAME
  • ADDRESS1
  • ADDRESS2
  • CITYSTZIP
  • OLDLAND
  • OLDIMPR
  • OLDTOTAL
  • NEWLAND
  • NEWIMPR
  • NEWTOTAL
  • PHASELAND
  • PHASEBUILD
  • PARTPART
  • VACLNDUSE
  • LOWNUMBER
  • HIGHNUMBER
  • STREETNAME
  • STREETCODE
  • QDRNTNAME
  • DELCODE
  • HSTDCODE
  • CLASSTYPE
  • TAXRATE
  • MIXEDUSE
  • MIX1TXTYPE
  • MIX1CLASS
  • MIX1RATE
  • MIX1LNDPCT
  • MIX1LNDVAL
  • MIX1BLDPCT
  • MIX1BLDVAL
  • MIX2TXTYPE
  • MIX2CLASS
  • MIX2RATE
  • MIX2LNDPCT
  • MIX2LNDVAL
  • MIX2BLDPCT
  • MIX2BLDVAL
  • OWNOCCT
  • COOPUNITS
  • PCHILDCODE
  • ABTLOTCODE
  • SALEPRICE
  • SALEDATE
  • INSTNO
  • ACCEPTCODE
  • SALETYPE
  • MORTGAGECO
  • ASSESSMENT
  • ANNUALTAX
  • EXTRACTDAT
  • DEEDSTATUS
  • CAPCURR
  • CAPPROP
  • TXSALEDESC
  • CLASS3
  • PAGE_NUM
    Page Number
  • SSL
    Lot Square Suffix and Lot
  • OWNNAME2
  • DEEDS
  • CY1YEAR
  • CY1TXSALE
  • CY1TAX
  • CY1PEN
  • CY1INT
  • CY1FEE
  • CY1TOTDUE
  • CY1COLL
  • CY1BAL
  • CY1CR
  • CY2YEAR
  • CY2TXSALE
  • CY2TAX
  • CY2PEN
  • CY2INT
  • CY2FEE
  • CY2TOTDUE
  • CY2COLL
  • CY2BAL
  • CY2CR
  • PY1YEAR
  • PY1TXSALE
  • PY1TAX
  • PY1PEN
  • PY1INT
  • PY1FEE
  • PY1TOTDUE
  • PY1COLL
  • PY1BAL
  • PY1CR
  • PY2YEAR
  • PY2TXSALE
  • PY2TAX
  • PY2PEN
  • PY2INT
  • PY2FEE
  • PY2TOTDUE
  • PY2COLL
  • PY2BAL
  • PY2CR
  • PY3YEAR
  • PY3TXSALE
  • PY3TAX
  • PY3PEN
  • PY3INT
  • PY3FEE
  • PY3TOTDUE
  • PY3COLL
  • PY3BAL
  • PY3CR
  • PY4YEAR
  • PY4TXSALE
  • PY4TAX
  • PY4PEN
  • PY4INT
  • PY4FEE
  • PY4TOTDUE
  • PY4COLL
  • PY4BAL
  • PY4CR
  • PY5YEAR
  • PY5TXSALE
  • PY5TAX
  • PY5PEN
  • PY5INT
  • PY5FEE
  • PY5TOTDUE
  • PY5COLL
  • PY5BAL
  • PY5CR
  • PY6YEAR
  • PY6TXSALE
  • PY6TAX
  • PY6PEN
  • PY6INT
  • PY6FEE
  • PY6TOTDUE
  • PY6COLL
  • PY6BAL
  • PY6CR
  • PY7YEAR
  • PY7TXSALE
  • PY7TAX
  • PY7PEN
  • PY7INT
  • PY7FEE
  • PY7TOTDUE
  • PY7COLL
  • PY7BAL
  • PY7CR
  • PY8YEAR
  • PY8TXSALE
  • PY8TAX
  • PY8PEN
  • PY8INT
  • PY8FEE
  • PY8TOTDUE
  • PY8COLL
  • PY8BAL
  • PY8CR
  • PY9YEAR
  • PY9TXSALE
  • PY9TAX
  • PY9PEN
  • PY9INT
  • PY9FEE
  • PY9TOTDUE
  • PY9COLL
  • PY9BAL
  • PY9CR
  • PY10YEAR
  • PY10TXSALE
  • PY10TAX
  • PY10PEN
  • PY10INT
  • PY10FEE
  • PY10TOTDUE
  • PY10COLL
  • OP_YN
    Flag if related ownerpoint record was found for source date of COL.
  • CLASS3EX / ESRI
    Area of feature in internal units squared.
  • SHAPE_AREA / ESRI
    Area of feature in internal units squared.

Metadata

FGDC Content Standards for Digital Geospatial Metadata / FGDC-STD-001-1998 as of 20121011

Provided by
GIS Data Coordinator
in D.C. Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

phone: REQUIRED: The telephone number by which individuals can speak to the organization or individual.
fax: (202) 727-5660
hours: 8:30 am - 5 pm