Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.
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Transcript of Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.
![Page 1: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/1.jpg)
Quality Assessment of Roads in Colorado Based on Satellite Imagery
April 7, 2014
![Page 2: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/2.jpg)
Algorithm Overview
Satellite Imagery
Road Identification
Image Analysis
Road Condition
Assessment
Overview Identification Analysis Testing Conclusion
![Page 3: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/3.jpg)
Pan-Sharpening
What we have
• High resolution panchromatic imagery (B/W)
• Low resolution multispectral imagery (Color)
We create high resolution color images (Pan-sharpening)
Helps in retaining 8 bands of information at high resolution
• Will help automatically identify asphalt better
Overview Identification Analysis Testing Conclusion
![Page 4: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/4.jpg)
Next we perform machine learning based classification• To increase infallibility of automatic extraction of asphalt pixels
Road Identification
Training Data
Satellite Imagery
Classifier Asphalt Pixels
Overview Identification Analysis Testing Conclusion
![Page 5: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/5.jpg)
Highway pavement becomes lighter in panchromatic grayscale shade as it degrades• Digital number increases
• Mean increases
Highway pavement becomes less uniform as it degrades• Data range increases
• Variance increases
• Entropy increases
These changes are detectable through texture filtering of satellite imagery
Can likely be used to classify road surface conditions such as good, fair, poor and to justify repaving needs
Image Analysis
Overview Identification Analysis Testing Conclusion
![Page 6: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/6.jpg)
Asphalt Degradation
Spectral Characteristics of Aging Asphalt (Herold, 2007)
Overview Identification Analysis Testing Conclusion
![Page 7: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/7.jpg)
Digital Number
21B 115A 24A
Highways in Colorado Springs
Overview Identification Analysis Testing Conclusion
![Page 8: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/8.jpg)
Digital Number
Good Fair Poor
Mean 214.3 307.7 377.7
STD 5.2 10.3 29.5
Overview Identification Analysis Testing Conclusion
![Page 9: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/9.jpg)
Variance
21B 115A 24A
Highways in Colorado Springs
Overview Identification Analysis Testing Conclusion
![Page 10: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/10.jpg)
Good Fair Poor
Mean 18.7 31.5 174.0
STD 10.7 27.6 145.7
Variance
Overview Identification Analysis Testing Conclusion
![Page 11: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/11.jpg)
Remote Sensing Road Quality Assessment
Overview Identification Analysis Testing Conclusion
![Page 12: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/12.jpg)
Result Comparison and Verification
CDOT and PPACG perform in situ road surveillance at specific regions of interest
University of Colorado implements its remote sensing based road condition assessment scheme on same regions
Compare the results and quantify the degree of agreement
Overview Identification Analysis Testing Conclusion
![Page 13: Quality Assessment of Roads in Colorado Based on Satellite Imagery April 7, 2014.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649d895503460f94a6eda8/html5/thumbnails/13.jpg)
Conclusion
A technically detailed scheme is in place
Project moving ahead on schedule
May supplement or replace current techniques
Investment towards faster and easier surveillance
Overview Identification Analysis Testing Conclusion