mapping singapore in 3d - clc singapore in 3d.pdf · •the most important element is ... open...

Presenter: © 2011 Singapore Land Authority Presenter: Victor Khoo

Mapping Singapore in 3D

Mr Soh Kheng Peng

Chief Surveyor, SLA

Dr. Victor Khoo

Deputy Director, Land Survey Division, SLA

Presenter: Derick Tan ©SLA 2014

Google

New Maps are 3D


• 3D Digital Built Environment

plays a key role in supporting the

development and operation of

Smart Nation.

•The digital environment supports

planning, management,

modelling, simulation and

visualisation.

•The most important element is

the 3D map data.


Vision for 3D Mapping

• SLA leads a WOG initiative to create and maintain a high-resolution geometrically-accurate 3D national topographic map

• Develop once; Use by many

• High resolution in order to meet the requirements of most agencies

• Open standard exchange format for interoperability and sharing in SG-SPACE

• Common authoritative 3D base map to support collaboration among agencies

• Workflow for continuous maintenance to ensure currency of data


3D National Topographic Mapping

• MOF RF funded project

• 3-year project started in April 2014

• Led by SLA in partnership with CAAS and

PUB

Accurate terrain model to support

PUB

Accurate building height to support

CAAS

•Airborne Imagery and Laser Scanning

•Mobile Imagery and Laser Scanning

Capture 3D Data

•CityGML exchange format

•Terrain Models, 3D Buildings, 3D Roads (LOD0, LOD1, LOD2)

Create 3D Models

•CityGML Schema (OGC open standard)

•Relational Database

Establish Standards & Database

•Ground-based Laser Scanning/ Topographic Survey

•Satellite Imagery

•Building Information Model (BIM)

Update Changes

Project Scope


Data Capturing using Rapid 3D

Mapping Technology

Airborne Laser Scanning

& Imaging

Mobile Laser Scanning &

Imaging

Phase 1 – FY13 to FY15 Phase 2 – FY14 to FY16


Vertical and Oblique Images

• Altitude of 2800 ft – 4000 ft

• Total of about 40,000 images

• 13cm Ground Sample Distance (GSD)

• 3 Bands, RGB

• Altitude of 2800 ft – 4000 ft

• Total of about 10,000 images

• 10cm Ground Sample Distance (GSD)

• 3 Bands, RGB

• Front overlaps 60%, Side overlaps 25%

Vertical Image Oblique Image


Airborne Laser Scanning – Point Clouds Data

Altitude of 3600ft

Minimum 5 points/sq m

Vertical accuracy +/- 15cm


Orthophoto – accurate photo map

(10 cm resolution)


Digital Surface Model (DSM) / Digital

Terrain Model (DTM)


3D Modelling and Data Management

• CityGML represents

• 3D geometry, 3D topology, semantics, and appearance

• in 5 discrete scales (Levels of Detail, LOD)

LoD0

Terrain Model

LoD1

Block models with

no roof structures

LoD2

Explicit roof

structures

LoD3

Detailed

architectural

models

LoD4

Interior

modelled

Source: Thomas Kolbe


CityGML 3D Models - 3 Major

Components

Digital Terrain Model (DTM)

(LOD0) [Phase 1]

3D Buildings (LOD1 &

LOD 2) [Phase 1]

3D Roads (LOD 2)

[Phase 2]


Benefits

• Biggest geospatial dataset ever collected homogenously in Singapore to support analytics – 40 TB of data and products

• First high resolution 3D map that covers the whole of Singapore

• Building up WOG 3D capabilities

• 3D models with qualities that ensure widespread applications

• precise geometry

• open standard (CityGML)

• smart data model

• high resolution

• current and comprehensive


3D Data for Agencies

• URA, HDB & JTC - Development Planning

• JTC - Underground Space Utilisation

• PUB – Underground Utilities

• BCA – Underground Geological Mapping

• NEA, URA & HDB – Urban Air Flow

Dynamics

• IDA - Telecommunications Coverage

• NCCS – Climate Change Study

• EMA – Solar Potential Study

• URA & HDB – Urban Heat Island

• NHB - Heritage Preservation

Development Planning Underground Infrastructure

Underground Utilities

3D Geological Map

Urban Air Flow Dynamic

Telecommunication Coverage

Sea Water Rise

Solar Potential Study

Urban Heat Island

Discovery of Underground Infrastructure


What is Next ?

Integration with 3D Property

Information and BIM

Indoor Mapping Underground Mapping

Virtual Singapore


Thank You

mapping singapore in 3d - clc singapore in 3d.pdf · •the most important element is ... open...

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