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Using Feature analyst to extract building features using naip imagery – Dos Palos, Merced county

Using Feature analyst to extract building features using naip imagery – Dos Palos, Merced county. Tan Hoang – geog 342. Building Feature extraction. Dos Palos, Merced County Urban development can be measured in many ways. Urban land cover – Not all land cover the same

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Using Feature analyst to extract building features using naip imagery – Dos Palos, Merced county

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  1. Using Feature analyst to extract building features using naip imagery – Dos Palos, Merced county Tan Hoang – geog 342

  2. Building Feature extraction • Dos Palos, Merced County • Urban development can be measured in many ways. • Urban land cover – Not all land cover the same • Building features – Useful to analyze direct long-term impact and growth • Tool: Feature Analyst 5.0 • Supervised Learning • National Agriculture Imagery Program (NAIP) aerials • 2005 • 2010

  3. STEPs • Create polygons to serve as training features for Feature Analyst. • Supervised Learning • Manmade Features (>5 m) • Input Representation • Bull’s Eye 2 • Manhattan • Masks • Roads • City Limits

  4. Clutter removal/adding missed features & repeat

  5. issues • Roads and sidewalks similar to some rooftops • Used mask to exclude roads • Dirt lots/unfinished subdivisions/parks • Repeated revisions

  6. frustration

  7. Limits to repeated revisions

  8. Results – after square up tool

  9. Potential use as building Points • NAIP not high-res enough • Extractedfeatures never quite match up to aerials • Could use as building point feature extractions

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