1 / 26

Beyond Spectral and Spatial data: Exploring other domains of information: 4

Beyond Spectral and Spatial data: Exploring other domains of information: 4. GEOG3010 Remote Sensing and Image Processing Lewis RSU. Domains of Information. spectral angular multi-temporal distance-resolved spatial. Distance-resolved.

astoller
Télécharger la présentation

Beyond Spectral and Spatial data: Exploring other domains of information: 4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Beyond Spectral and Spatial data:Exploring other domains of information: 4 GEOG3010 Remote Sensing and Image Processing Lewis RSU

  2. Domains of Information • spectral • angular • multi-temporal • distance-resolved • spatial

  3. Distance-resolved • Can determine distance from satellites: • based on time-delay of signal

  4. Distance-resolved • Can determine distance from satellites: • based on time-delay of signal

  5. Distance-resolved • eg GPS

  6. Distance-resolved • EO example: • radar interferometry

  7. ¾ way through half cycle 1 cycle (5.6 cm for C band) Distance-resolved • EO example: • radar interferometry: • assume know satellite position (¾+1)x180 = 315 degrees ¾ way through 270 degrees 2 x d1 = (N1+¾)x5.6 (360 degrees, 2 radians)

  8. Distance-resolved • EO example: • radar interferometry: 2 x (d2 - d1) = (N2- N1) x 5.6 + (¾-0) x 5.6 0 way through 2 x d2 = (N2) x 5.6

  9. Distance-resolved • EO example: • position 1: • 2 x (d2 - d1) = (N2- N1) x 5.6 + (¾-0) x 5.6 • position 2: • point on ground next to current point will have different phase change • if its within the same cycle (height change less than 5.6cm) • can tell relative height change between these points • very precise (mm)

  10. Shuttle Radar Topography Mission

  11. Shuttle Radar Topography Mission 11 Feb 2000 (Endeavour) - 11 days 30m DEM of +/- 60 degrees latitude

  12. Distance-resolved Measure small change - subsidence

  13. Distance-resolved Measure small change - earthquake

  14. Distance-resolved RADAR RAdio Detection And Ranging LIDAR LIght Detection And Ranging

  15. Distance-resolved LIDAR • Send laser pulse from sensor • measure round trip time • = 2x distance • use NIR mostly • atmospheric effects minimised

  16. Distance-resolved LIDAR • Examples - EA • fly aiborne LIDAR regularly for high resolution DEM • use first/last return • ground height / tree height

  17. Distance-resolved - LIDAR

  18. Distance-resolved LIDAR • Examples - VCL • Vegetation Canopy LIDAR • NASA mission to fly ???? • waveform LIDAR

  19. Distance-resolved VCL • waveform LIDAR

  20. Distance-resolved • waveform LIDAR

  21. LIDAR • ‘Simple’ form of measurement • easy to use (? Simply) • doesn’t work (well) on high slopes • requires highly-sensitive instrumentation • potentials for new forms of information • waveform LIDAR

  22. Interferometry • Used for number of years • operational (SRTM) • different ‘scales’ for different SAR frequencies • doesn’t work well (for height) if change between images • wind in forests • doesn’t work on high slopes

More Related