BIN Project : City of New York

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BIN Project City of New York
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Objective

• Assign all NYCMAP building polygons with a
  Building Identification Number (BIN)
• Associate a Borough-Block_Lot (BBL) to each
  Building Polygon
• Maintain real time Building status by tracking
  permit to COO process and building footprint
  changes

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Automatic BIN Assignment

• Overlay parcel geometries with building
  geometries
• each BBL has zero, one or many BINs
• Assign BINs to building geometries when there is
  a one to one correspondence given
• 75 overlap of building polygon with parcel or
• 60 overlap and centroid of building within
  parcel
• For matches fill in Rpad fields
• cogis_borough cogis_tax_block cogis_tax_lot
  cogis_bbl rpad_high_house rpad_low_house
  rpad_street_name.

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Building Layer Assignment Verification Process

• Automated assignment of Borough, Block and Lot -
• Parcel data was extracted from COGIS layer
  using a point-in-polygon operation.
• The specified criteria for building polygons
  to become associated with a lots BBL
• 75 of the building polygon overlaps with a
  parcel, or
• 60 overlap occurs and the centroid of that
  building is within the parcel.

COGIS Layer access BBL number
Associate BBL with building polygon
Building Layer with newly inserted BBL number
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B U I L D I N G A T T R I B U T E S
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Manual Verification Process

• Building Polygons with unverified or no BINs
• Address from Sanborn verify in GOAT
• Multiple buildings or too few buildings per
  parcel
• use Sanborn as guide
• fewer buildings, then split
• too many building components merge
• more than one address range use PACS to get
  address then query GOAT to assign BIN
• for discrepancies use secondary sources such as
  aerial photographs and call a contact person
• no BIN found assign as problem
• New, Demolished or Altered Buildings
• On Sanborn and GOAT create new building poly,
  delete or addition
• DOB/HPD source

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Work Environment
Work Environment
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Validation Procedure (Attr.)

• Automatic Validation Procedures
• Check for duplicate BIN
• 7 digit BIN and first digit less than 6
• if bbl_source Rpad or Geo and no record found
  in Geo_Rpad table using current BBL
• invalid BBL flag raised
• if bbl_source Geo and bin_source Geo but no
  record in Geo_Rpad of BBL/BIN combination
• invalid BIN/BBL combination flag raised

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Validation (Geometry) Cont.

• Trigger attribute setting
• split/merge action ----gt poly mod lt----
  split/merge
• digitize action ----gt poly mod lt---- new
• User input
• source type lt---- photogrammetric (default)
• source type lt---- other (manual)
• source type lt---- site plan

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(No Transcript)
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Data Model
Geo-Rpad
Permits
mn
1n
mn
(bin)
(bbl)
Buildings
COGIS
(bbl)
mn
(bin)
1n
Address
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Breezy Point - more buildings than BINs
BBL 4163500400
BIN list contains 82 entries - there are at least
200 buildings. COGIS inaccuracy also shown by
missing lot buildings at left center. This
problem also occurs frequently in new condominium
developments.
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Inaccuracy of COGIS coverage
Misalignment results in automatic matching with
incorrect lot, frequently extending down entire
block. In addition, polygons are missing for
Central Park, JFK Airport, Flushing Meadows Park
and perhaps other parks.
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La Guardia Airport - not enough BINs
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MTA Coney Island Yard - no BINs
BBL 3072080040
In addition to MTA yards and the airports, this
is frequently found in Con Edison substations,
parks, universities and hospitals.
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One building covering multiple lots
BBL 3050500051
Building covers (w to e) lots 76, 71, 66, 62, 60
and 51. All lots except 51 have 3000000 as BIN
in GOAT.
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BIN without a building - lot is underwater!
BBL 3088960550
There are many other GOAT BINs for which no
buildings are found. PACS frequently lists these
either as vacant land, or with buildings built
early in the 20th century.
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A long lot 4 feet wide!
BBL 4088920135
Many other bizarre shapes are found, occasionally
with a BIN. Many other lots have been found in
which the GOAT address entry obviously applies to
a totally separate block.
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Garages with and without BINs
BBL 2055320101
The great majority of garages do not have their
own BINs listed in GOAT. Occasionally, a group
of garages with BINs is found, and the
Douglaston area of Queens appears to be unique in
that nearly every garage has its own BIN.
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Garage and gas station - built 1800?
BBL 3084330052
This PACS entry is obtained for a significant
number of vacant lots. Perhaps 1800 is a default
date?
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Church on a condominium lot
BBL 1018597501
Tempted as one might be to assert that God works
in mysterious ways, further investigation reveals
that PACS does not list the church as lot owner,
and the church is not listed in the Manhattan
telephone directory. It is therefore likely that
this is an instance of Sanborns maps being out
of date.