urban monitor update · •urban environments are highly dynamic and need monitoring •satellite...

Urban Monitor Update including recent high resolution vegetation masks and relative elevation maps

CSIRO MATHEMATICS, INFORMATICS AND STATISTICS

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Kassel Hingee| Graduate Fellow

8th November 2012

• Urban Monitor History

• Recent Accomplishments • Vegetation/non-vegetation classification

• Vegetation Heights

• More Products

• Processed both 2007 and 2009

• AND we delivered them to DEC

• Can Land Monitor Benefit?

Urban Monitor Update | Kassel Hingee

Contents

2 |

• Urban environments are highly dynamic and need monitoring

• Satellite resolutions are insufficient for complex urban/peri-urban scenes

• High resolution aerial photography is already collected at least annually for large cities, and fairly regularly in most other areas (adding a monitoring process is an economical opportunity wherever

photography is regularly gathered)

Because we want a quantitative monitoring system (more than humans

viewing images):

• New methods for the higher resolutions

• New methods for dealing with the variations in aerial photography


Urban Monitor History Inception

3 |

• Acquired every summer since 2007

• 9600km2

• Raw:

13TB to 40TB per annum

• Less than 0.3m GSD

• 4 bands: Near-infrared, Red, Green and Blue


Urban Monitor History The Raw Data

4 |

• 2.5 dimensional

• Used to orthorectify spectral data

• 0.2m GSD

• Storage: 1.3TB per annum


Urban Monitor History Digital Surface Models

5 |

• Calibrated to ground reflectance

• Consistent spectral values

• -> Classifications using spectral values


Urban Monitor History Calibrated Orthophotos

6 |

Uncalibrated Calibrated


Urban Monitor History Qualitative Change Comparisons

7 |

2009

2007

2007 vigour index in red 2009 vigour index in green

Recent Accomplishments



9 |

Photos from

aeroplane DSM

Ground

Elevation Model

Calibrated Multispectral

Images

Heights

of Pixels (nDSM)

Vegetation/non-veg

Classification

Vegetation

Heights

Vegetation

Vigour

Grass/non-grass

Classification

Tree/non-tree Classification

• Split region into tiles (easier to store, transport and open)

• 73 tiles, 13km by 15km each

• 0.2m GSD

• Both 2007 and 2009 processed

• Delivered all of it to DEC (about 20TB)



10 |


Recent Accomplishments Digital Surface Model

11 |


Recent Accomplishments Ground Elevation Model

12 |


Recent Accomplishments Heights above ground (nDSM)

13 |


Recent Accomplishments Calibrated Orthophoto

14 |


Recent Accomplishments Vegetation/non-vegetation classification (nDSM displayed behind)

15 |


Recent Accomplishments Vegetation height (nDSM displayed behind)

16 |


Recent Accomplishments Vegetation vigour (nDSM displayed behind)

17 |


Recent Accomplishments Irrigated Grass Mask (nDSM displayed behind)

18 |


Recent Accomplishments Tree Mask (nDSM displayed behind)

19 |

Whats Next

• Accuracy analysis

• Change maps

• Statistical summaries

• Multiclass classifications

• Shadow mask

• Water mask

Urban Monitor Update | Kassel Hingee 20 |

How Land Monitor Can Benefit

• High resolution aerial photography is being acquired by the state.

• Urban Monitor methods will easily transfer to 50cm resolution

• At 50 cm GSD: 1 tile ≈ 1:25 000 map sheet

• Quick, computer generated vegetation extents and vegetation heights.

• Much higher resolution ground elevations and vegetation masks

Urban Monitor Update | Kassel Hingee 21 |

CMIS Kassel Hingee Graduate Fellow

t (08) 9333 6010 e [email protected]

CSIRO MATHEMATICS INFORMATICS AND STATISTICS

Thank you

urban monitor update · •urban environments are highly dynamic and need monitoring •satellite...

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