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TRANSCRIPT
Practical Applications for Remote Sensing 10/24/2017
What is Feature Extraction?
• Transforming data into information
Advantages of Feature Extraction
• Analysis of multiple data sources
• Reproducible results and repeatability
• Versatility and adaptability
• Analysis of data pixel by pixel, point by point
• Analysis of objects measures such as shape, size, texture, shadow, context, association etc.
• Scientific measure of accuracy
• Reduce labor cost and time
What makes Feature Extraction
possible?
Object Based Image Analysis (OBIA)
• Segmentation: The process of grouping together pixels based on certain criteria.
• These objects are then classified based on
– Radiometry/reflectance
– Geometry/shape
– Neighborhood/context
– Topology/network structure
Image Segmentation
• The problem: The explicit determination of the amount and distribution of the desired ground phenomena.
– Edge detection
– Region growing
Classification
What makes feature extraction possible?
Lidar Segmentation
• Anisotropic/sub-randomly distributed point cloud.
• Automated Feature Extraction– Extract– Fuse and Extract– Extract, Fuse and Extract– Classification
• GIS/Carto– Editing
• Achieve cartographic standards• Achieve accuracy standards
– Data simplification– Data validation
• QA/QC– Accuracy check– Quality check– Reporting
Feature Extraction Process
Feature Extraction Process
LidarTopology Determination
Plane detection by segmentation
LidarTopology Determination
Plane detection by segmentation
LidarTopology Determination
Plane detection by segmentation
LidarPolygon Generation
Plane detection by segmentation
Change Detection
• New deck?
Change Detection
• 2006 - 2011
Building Outlines
Building Outlines
Land Use/Land Cover Mapping
Land Use/Land Cover Mapping
Impervious Surface Mapping• Incorporate historical data• Parcel mapping• Road centerlines• Land-cover• Impervious surface• Zoning maps
Road CenterlinesParcel Mapping
Impervious Surface Mapping
Impervious Surface Mapping
Impervious Surface Mapping
Wetland Mapping
Wetland Mapping
Wetland Mapping
Terrain Modeling
Solar Potential
Solar Potential
Solar Potential (Feb)
Solar Potential (Apr)
Solar Potential (July)
Solar Potential
Why?
• Reproducible
• Reduce field work
• Reduces manual edits
• Simplifies the comparison process
• Leverages existing data!
Questions / Comments
Kent L ParkGeospatial Project Manager
317.281.2092