CARSI & DOITT Co-operative NYCMap Maintenance & Enhancement

Products and Application Development Incremental Updates BIN Project Creation of NYC DEM

NYCMap Specifications 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 >= 7 stories New Features: billboards, park paths, ballfields, pools, etc.

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

Updating the NYCMap from 1996 to : 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

SANBORN Photo Update NYCMap Incremental Updates and Database Integration Insert Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes UPDATED NYCMap Apply to database Update Delete Correct Aerial Survey Kinematic GPS Inertial Navigation Unit Scanning Bundle Adjustment Stereo-model Orthophoto Import old basemap Supply of GPS Data Compilation Analog and/or digital output Detect changes Capture changes Generic ASCII CARSI QC Objects Sanborn Process Film Development Control Points

Changed Objects Detect changes NYCMap Incremental Updates and Database Integration Aerial Survey Kinematic GPS Inertial Navigation Unit Scanning Bundle Adjustment Stereo-model Orthophoto Import old basemap Supply of GPS Data Compilation Analog and/or digital output Detect changes Capture changes Generic ASCII CARSI QC Objects Sanborn Process Film Development Control Points Sanborn Re-check SANBORN Photo Update Generic ASCII CARSI QA Objects Inspect Changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Reject Changes UPDATED NYCMap Apply to database Update Delete Correct

Generic ASCII CARSI QA Objects NYCMap Incremental Updates and Database Integration Inspect Changes SANBORN Photo Update Changed Objects Detect changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes UPDATED NYCMap Apply to database Update Delete Correct Base Map QC/QA objects: Approximately 320 tiles (2000m.sq.) Average number of QA objects per tile: 700 Insert Update Delete Tile # 30056

Generic ASCII CARSI QA Objects NYCMap Incremental Updates and Database Integration Inspect Changes SANBORN Photo Update Changed Objects Detect changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes UPDATED NYCMap Apply to database Update Delete Correct Base Map: 1996 Ortho-photography and planimetric data

Generic ASCII CARSI QA Objects NYCMap Incremental Updates and Database Integration Inspect Changes SANBORN Photo Update Changed Objects Detect changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes UPDATED NYCMap Apply to database Update Delete Correct Base Map: 2001 Ortho-photography and planimetric data

Generic ASCII CARSI QA Objects NYCMap Incremental Updates and Database Integration Inspect Changes SANBORN Photo Update Changed Objects Detect changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes UPDATED NYCMap Apply to database Update Delete Correct QC/QA Objects Base Map: 2001 Ortho-photography and planimetric data

Generic ASCII CARSI QA Objects NYCMap Incremental Updates and Database Integration Inspect Changes SANBORN Photo Update Changed Objects Detect changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes UPDATED NYCMap Apply to database Update Delete Correct QC/QA Objects 2001 Updated Base Map Base Map: 2001 Ortho-photography and planimetric data

Inspect Changes Insert Update Delete NYCMap Incremental Updates and Database Integration Before accepting changes After accepting changes Accept Changes VALIDATION Geometric Topology Attribute Consistency UPDATED NYCMap Apply to database SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Sanborn Re-check Reject Changes Correct Buildings

Inspect Changes Insert Update Delete NYCMap Incremental Updates and Database Integration Accept Changes VALIDATION Geometric Topology Attribute Consistency UPDATED NYCMap Apply to database SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Sanborn Re-check Reject Changes Correct Before accepting changes After accepting changes Buildings Changed

Inspect Changes Insert Update Delete NYCMap Incremental Updates and Database Integration Accept Changes VALIDATION Geometric Topology Attribute Consistency UPDATED NYCMap Apply to database SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Sanborn Re-check Reject Changes Correct Before accepting changes After accepting changes Buildings Deleted

NYCMap Incremental Updates and Database Integration SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency UPDATED NYCMap Apply to database Update Delete Reject Changes Sanborn Re-check Correct Rejected QC Object for new building New building’s polygon overlaps existing building

NYCMap Incremental Updates and Database Integration SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency UPDATED NYCMap Apply to database Update Delete Reject Changes Sanborn Re-check Correct Features overlooked by Sanborn QC rejected object Sanborn Re-check Geometric accuracy Positional correctness Changed Objects CARSI QC Objects Send to Sanborn as Generic ASCII Correct Send to CARSI as Generic ASCII Missed feature Capture geometry and position

Accept Changes VALIDATION Geometric Topology Attribute Consistency NYCMap Incremental Updates and Database Integration UPDATED NYCMap Apply to database SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Insert Sanborn Re-check Reject Changes Update Delete Correct 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

UPDATED NYCMap Apply to database NYCMap Incremental Updates and Database Integration SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes Update Delete Correct 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 Accepted QA/QC objects Rejected QA/QC objects Map Legend

UPDATED NYCMap Apply to database NYCMap Incremental Updates and Database Integration SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes Update Delete Correct Buildings Building Component, Building Internal Open Spaces Transportation Curbs Street centerlines Railroads Transportation Structures Bridge, Tunnel, Railroad Viaduct Utility Tank, Tower, Antenna Billboard-Toll Topography Spot Elevations, Contour Lines Hydrography Hydro centrelines Hydro features Lake, Reservoir, Pond, Wetland. Beach, Bay Hydro Structures Pier, Jetty, Seawall Cemetery, Recreation Areas, Ball Fields, Pools, Hard Surface Courts, Skating Rings, Playgrounds, Parking lots. Power Plant Substation Bike Pedestrian Path, Unpaved trails in parks Unpaved Trails in Parks

NYCMap Incremental Updates and Database Integration Apply to database UPDATED NYCMap SANBORN Photo Update Changed Objects Detect changes Generic ASCII CARSI QA Objects Inspect Changes Insert Accept Changes VALIDATION Geometric Topology Attribute Consistency Sanborn Re-check Reject Changes Update Delete Correct Base Map: 1996 Checkpoint: 10/10/ :12:07 Base Map: 2003 Checkpoint: 9/24/ :11:09 Objects: 37,812 Base Map: Changes Checkpoint: 9/24/ :11:09 Objects: 704 NYCMap Users Propagate Changes Export changes as ASCII Propagation of Base Map Changes to City Agencies Detect Changes

Incremental Updates: “the New Way” Implications of Incremental Updates Application Save Money Save Time Incremental Updates Improve Data Quality