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Developments in Remote Sensing and

Object-Based Image Classification for Urban

Applications at University of Sao Paulo

José Alberto Quintanilha

Rodrigo A. A. Nóbrega

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PaulClassification for Urban Applications at University of Sao Pauloo

Summary

� HRI and OBIA: the brazilian scenario

� LabGeo’s efforts on urban RS application

current, past and future researches

� Developing partnerships / integrated efforts

Slide 02

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

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Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Brazilian scenario on HRI

Lack of continuous mapping efforts

- outdated maps / costly process

- map production ↔↔↔↔ urban taxes

“land supervision is focusing on what happened” (autópsia do erro)

Slide 03

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Brazilian scenario on HRI

Aerial images or satellite images?

Which one is the best choice?

“RS technologies can provide better use of HRI than simple manual extraction or backgroung image“

Our goal: point out the “enhanced” use of HRI

Slide 04

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

3

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Brazilian scenario on HRI

How / Where / When to use HRI?

Urban application: monitoring

� feature extraction

� multi-temporal analysis

Challenges:

� Costly

� Need for “intelligent” application

Slide 05

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Labgeo’s research focus:

GIS

data aquisition;

data convertion / quality;

database;

Remote Sensing

image classification

land cover changes

Slide 06

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

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Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Projects related to HRI

� Per-pixel approaches on mining urban features from

IKONOS data Quintanilha / Osman

� Road detection over informal settlement areas Rodrigo / Leonardo

� Monitoring changes in land use/cover encircling the

trains domain bands Alessandra

� Metrics for urban-accessibility mined from HRI Cláudia

� Dinamic of spatial distribution regarding urban land zone George

� Urban growing /Change detection Arlete

Slide 07

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Projects related to HRI

Per-pixel approaches on mining urban features from IKONOS data Quintanilha / Osman

Principal Component Analysis

Max. Likelihood, Isodata, etc..

Slide 08

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

5

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Projects related to HRI

Road detection over informal settlement areas Rodrigo

Slide 09

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Projects related to HRI

Road detection in Rio de Janeiro using multi-spectral and elevation HRSC data leonardo

Slide 10

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

6

DevelopmentsDevelopments in Remote Sensing andin Remote Sensing and ObjectObject--Based Image Based Image

ClassificationClassification for for Urban Applications Urban Applications at at UniversityUniversity of of SaoSao PauloPaulo

Projects related to HRI

Monitoring changes in land use/cover encircling the urban railroad domain bands Alessandra

Slide 11

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

DevelopmentsDevelopments in Remote Sensing andin Remote Sensing and ObjectObject--Based Image Based Image

ClassificationClassification forfor Urban ApplicationsUrban Applications atat UniversityUniversity ofof SaoSao PauloPaulo

Projects related to HRI

Metrics for urban-accessibility mined fromHRI Cláudia

Slide 12

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

7

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Projects related to HRI

Dinamic of spatial distribution regarding urban land zone George

Slide 13

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Projects related to urban RS

Unsupervised classification applied to determine urban growth and change detection Arlete

Slide 14

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

1991 2002

URBAN SINCE 1991

URBAN GROWTH

OTHERS CLASSES

URBAN GROWTH SINCE 1991 TO 2002

WATER

VEGETATION

URBAN

BARE SOIL

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Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Developing partnerships/ integrated efforts

“Past 8 year of IKONOS launch, HRI are no more news”

Questions:

1. Demand of urban application for RS exists

2. “inteligent” use of HRI is need

Slide 15

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Developing partnerships/ integrated efforts

Limitations of the public/private part

� business demands development of technology

� specialized manpower requested

Slide 16

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

9

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Developing partnerships/ integrated efforts

Limitations present at “academic world”:

� restricted budget

� need for integrate researches to the real-world’s demand

Slide 17

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Developing partnerships/ integrated efforts

First efforts on Object-Based Image Analysis, an overview:

� precursor / pioneer researches

� lack of knowhow

� limited (or no) investments

� international cooperation required

Slide 18

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007

10

Developments in Remote Sensing and ObjectDevelopments in Remote Sensing and Object--Based Image Based Image

Classification for Urban Applications at University of Sao PauClassification for Urban Applications at University of Sao Paulolo

Developing partnerships/ integrated efforts

Suggestion:

� merging isolated efforts concerning a commom goal about OBIA

� external cooperation to support investigations

Slide 19

1st Multidisciplinary Workshop on Extracting and Classifying Ur1st Multidisciplinary Workshop on Extracting and Classifying Urban Objects from High Resolution Satellite Images, Sao Paulo, ban Objects from High Resolution Satellite Images, Sao Paulo, April 18, 2007April 18, 2007