CARSI

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CARSI DOITT Co-operative NYCMap Maintenance
Enhancement
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Products and Application Development

• Incremental Updates
• BIN Project
• Creation of NYC DEM

3
NYCMap Specifications

• 2001-02 update enhanced
• 0.75 feet orthophotography
• true orthophotos for Manhattan
• 3-D model of every building in Manhattan and
  every block in other boroughs with a building gt
  7 stories
• New Features
• billboards, park paths, ballfields, pools, etc.

4
NYCMap Creation and Update the Old Way
Hard Copy Maps
CARSI Inspect for correctness
Hard Copy Maps with Corrections
Send corrections to Sanborn as hard copy. Repeat
process 2-3 times until correct.
Send to Sanborn as hard copy
Sanborn Re-check Geometric accuracy Positional
correctness
Correct
Updated Hard Copy Maps
Export to CARSI
Updated Base Map
Process repeats for each of the 1,900 tiles in
base map.
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Updating the NYCMap from 1996 to 2001-2 the
New Way

• Incremental Updating Process
• Capture new objects, deleted objects and update
  objects photogrammetrically
• Bring in QC objects for review
• compare with new orthophotography
• test against changes registered by DOB and DDC
• accept or reject QC objects
• accept - system updated automatically
• Validation of accepted QC object

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NYCMap Incremental Updates and Database
Integration
SANBORN Photo Update
Sanborn Process
Supply of GPS Data
Film Development
Aerial Survey Kinematic GPS Inertial Navigation
Unit
Bundle Adjustment
Stereo-model
Import old basemap
Scanning
Control Points
Detect changes
Compilation
Capture changes
Orthophoto
Generic ASCII
CARSI QC Objects
Analog and/or digital output
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NYCMap Incremental Updates and Database
Integration
Sanborn Process
Supply of GPS Data
Film Development
Aerial Survey Kinematic GPS Inertial Navigation
Unit
Bundle Adjustment
Stereo-model
Import old basemap
Scanning
Control Points
Detect changes
Compilation
Capture changes
Orthophoto
Generic ASCII
CARSI QC Objects
Analog and/or digital output
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NYCMap Incremental Updates and Database
Integration
Tile 30056
Base Map QC/QA objects Approximately 320 tiles
(2000m.sq.) Average number of QA objects per
tile 700
Insert
Update
Delete
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NYCMap Incremental Updates and Database
Integration
Base Map 1996 Ortho-photography and planimetric
data
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NYCMap Incremental Updates and Database
Integration
Base Map 2001 Ortho-photography and planimetric
data
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NYCMap Incremental Updates and Database
Integration
Base Map 2001 Ortho-photography and planimetric
data
QC/QA Objects
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NYCMap Incremental Updates and Database
Integration
Base Map 2001 Ortho-photography and planimetric
data
QC/QA Objects
2001 Updated Base Map
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NYCMap Incremental Updates and Database
Integration
Buildings
After accepting changes
Before accepting changes
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NYCMap Incremental Updates and Database
Integration
Buildings Changed
After accepting changes
Before accepting changes
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NYCMap Incremental Updates and Database
Integration
Buildings Deleted
After accepting changes
Before accepting changes
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NYCMap Incremental Updates and Database
Integration
Rejected QC Object for new building
New buildings polygon overlaps existing building
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NYCMap Incremental Updates and Database
Integration
Features overlooked by Sanborn
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NYCMap Incremental Updates and Database
Integration

• GEOMETRY
• Buildings
• Internals - completely surrounded/bordered by
  buildings?
• Faces - bordered by exactly one building polygon?
• Edges
• Must be building internal if shared by two or
  more buildings
• Must be building face if not shared with another
  building
• Slivers report all buildings smaller then 5
  square feet
• Street Centerlines
• Street-centreline feature overlap
• Intersection of hidden street-centreline with
  visible street-centreline
• Visible street centerline may continue onto
  hidden segment with same name.
• Not connected street-centrelines
• Street-centerlines that end at something other
  than a dead-end or street intersection (3 or more
  street centerlines).

• ATTRIBUTES
• Railroad
• Name inconsistencies along connected railroad
  lines
• Street Centerlines
• Street-centreline LION file report any
  inconsistent street names based on LION

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NYCMap Incremental Updates and Database
Integration
Base Map 2003 Approximately 320 tiles
(2000m.sq.) Average number of QA objects per
tile 700 Average number of rejected QA objects
per tile 30 Estimated number of changes
224,000
Map Legend
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NYCMap Incremental Updates and Database
Integration

• Buildings
• Building Component, Building Internal
• Open Spaces
• Transportation
• Curbs
• Street centerlines
• Railroads
• Transportation Structures
• Bridge, Tunnel, Railroad Viaduct
• Utility
• Tank, Tower, Antenna

Cemetery, Recreation Areas, Ball Fields, Pools,
Hard Surface Courts, Skating Rings, Playgrounds,
Parking lots.
Bike Pedestrian Path, Unpaved trails in parks
Unpaved Trails in Parks
Power Plant Substation
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NYCMap Incremental Updates and Database
Integration
Propagation of Base Map Changes to City Agencies
Base Map 1996 Checkpoint 10/10/1996 111207
Detect Changes
Base Map 2003 Checkpoint 9/24/2003
131109 Objects 37,812
Export changes as ASCII
Base Map Changes Checkpoint 9/24/2003
131109 Objects 704
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Incremental Updates the New Way
Implications of Incremental Updates Application

• Save Money
• Save Time
• Incremental Updates
• Improve Data Quality