carsi & doitt co-operative nycmap maintenance & enhancement

CARSI & DOITTCo-operative NYCMap

Maintenance & Enhancement

Products and Application Development

• Incremental Updates

• BIN Project

• Creation of NYC DEM

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 >= 7 stories

New Features: billboards, park paths, ballfields, pools, etc.

NYCMap Creation and Update: “the Old Way”

Hard Copy Maps with Corrections

Sanborn Re-checkGeometric accuracy

Positional correctness

Send to Sanbornas hard copy

Correct

Export to CARSI

Hard Copy Maps

CARSIInspect forcorrectness

Process repeats for each of the 1,900 tiles in base map.

Updated Base Map

Updated Hard Copy Maps

Send correctionsto Sanbornas hard copy.

Repeat process 2-3 timesuntil correct.

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

SANBORNPhoto Update

NYCMap Incremental Updates and Database Integration

InsertChangedObjectsDetect

changesGeneric ASCII

CARSIQA Objects Inspect

ChangesAccept

Changes

VALIDATIONGeometric TopologyAttribute Consistency

SanbornRe-check Reject Changes

UPDATED NYCMap

Apply to database

Update

DeleteCorrect

Aerial SurveyKinematic GPS

Inertial Navigation Unit

ScanningBundle

AdjustmentStereo-model

Orthophoto

Import old basemap

Supply of GPS Data

Compilation

Analog and/or digital output

Detectchanges

Capture changes

GenericASCII

CARSI QC Objects

Sanborn Process

Film Development

Control Points

ChangedObjectsDetect

changes


Aerial SurveyKinematic GPS

Inertial Navigation Unit

ScanningBundle

AdjustmentStereo-model

Orthophoto

Import old basemap

Supply of GPS Data

Compilation

Analog and/or digital output

Detectchanges

Capture changes

GenericASCII

CARSI QC Objects

Sanborn Process

Film Development

Control Points

SanbornRe-check

SANBORNPhoto Update Generic

ASCII


Changes

Insert

AcceptChanges


Reject Changes

UPDATED NYCMap

Apply to database

Update

DeleteCorrect

Generic ASCII

CARSIQA Objects


InspectChanges

SANBORNPhoto Update


changes

Insert

AcceptChanges



UPDATED NYCMap

Apply to database

Update

DeleteCorrect

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

CARSIQA Objects


InspectChanges

SANBORNPhoto Update


changes

Insert

AcceptChanges



UPDATED NYCMap

Apply to database

Update

DeleteCorrect

Base Map:1996 Ortho-photographyand planimetric data

Generic ASCII

CARSIQA Objects


InspectChanges

SANBORNPhoto Update


changes

Insert

AcceptChanges



UPDATED NYCMap

Apply to database

Update

DeleteCorrect


Generic ASCII

CARSIQA Objects


InspectChanges

SANBORNPhoto Update


changes

Insert

AcceptChanges



UPDATED NYCMap

Apply to database

Update

DeleteCorrect

QC/QA Objects


Generic ASCII

CARSIQA Objects


InspectChanges

SANBORNPhoto Update


changes

Insert

AcceptChanges



UPDATED NYCMap

Apply to database

Update

DeleteCorrect

QC/QA Objects

2001 Updated Base Map


InspectChanges

Insert

Update

Delete


Before accepting changes After accepting changes

AcceptChanges


UPDATED NYCMap

Apply to database

SANBORNPhoto Update



CARSIQA Objects


Correct

Buildings

InspectChanges

Insert

Update

Delete


AcceptChanges


UPDATED NYCMap

Apply to database

SANBORNPhoto Update



CARSIQA Objects


Correct


Buildings Changed

InspectChanges

Insert

Update

Delete


AcceptChanges


UPDATED NYCMap

Apply to database

SANBORNPhoto Update



CARSIQA Objects


Correct


Buildings Deleted


SANBORNPhoto Update




Changes

Insert

AcceptChanges


UPDATED NYCMap

Apply to database

Update

Delete

Reject ChangesSanbornRe-check

Correct

Rejected QC Object for new building

New building’s polygonoverlaps existing building


SANBORNPhoto Update




Changes

Insert

AcceptChanges


UPDATED NYCMap

Apply to database

Update

Delete

Reject ChangesSanbornRe-check

Correct

Features overlooked by Sanborn

QC rejected object

Sanborn Re-checkGeometric accuracy

Positional correctness

Changed Objects

CARSI QC Objects

Send to Sanbornas Generic ASCII

Correct

Send to CARSIas Generic ASCII

Missed feature

Capture geometry and position

AcceptChanges



UPDATED NYCMap

Apply to database

SANBORNPhoto Update




Changes

Insert


Update

DeleteCorrect

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 NYCMapApply to

database


SANBORNPhoto Update




Changes

Insert

AcceptChanges



Update

DeleteCorrect

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 NYCMapApply to

database


SANBORNPhoto Update




Changes

Insert

AcceptChanges



Update

DeleteCorrect

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


Apply to database

UPDATED NYCMap

SANBORNPhoto Update




Changes

Insert

AcceptChanges



Update

DeleteCorrect

Base Map: 1996Checkpoint: 10/10/1996 11:12:07

Base Map: 2003Checkpoint: 9/24/2003 13:11:09Objects: 37,812

Base Map: ChangesCheckpoint: 9/24/2003 13:11:09Objects: 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

carsi & doitt co-operative nycmap maintenance & enhancement

Documents

update objects

changes sanborn photo

new objects

database update

deleted objects

nycmap creation

correct slide

nycmap specifications