Download
global change remote sensing n.
Skip this Video
Loading SlideShow in 5 Seconds..
Global Change: Remote sensing PowerPoint Presentation
Download Presentation
Global Change: Remote sensing

Global Change: Remote sensing

120 Vues Download Presentation
Télécharger la présentation

Global Change: Remote sensing

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Global Change: Remote sensing full-resolution image

  2. Global Change: Remote sensing

  3. Imagery: small scale (coarse) resolution – large area Visit September Sea Ice Concentrations for an animation of September sea ice concentrations 1979 -2010.

  4. Changes in snowmelt, Greenland High resolution: Jakobshavn Glacier http://earthobservatory.nasa.gov/IOTD/view.php?id=44625

  5. 2010 tied with 2005 as the warmest year since global records began in 1880

  6. Kilimanjaro: 1993 and 2000“ice predicted to disappear by 2010”new estimate: 2030

  7. Higher temperatures or lower moisture(presipitation) ?

  8. Introduction Remotely sensed satellite imagery is suitable for monitoring changes, with regular orbits Repeat period = 1- 20 days   ...subject to cloud cover and scale There are few satellite 'photos' - they are images, captured along scan paths. e.g. Earthnow(this webpage app needs Java) Early earth monitoring satellites were launched by NASA, but now many from other countries (and corporations). Types vary according to:

  9. 1. Electromagnetic spectrum wavelengths • Environmental Remote Sensing • Visible wavelengths 2. Near/mid Infra-Red • 3. Thermal infra-red (Heat) 4. Microwave radar (cloud-free) Reflected: Emitted:

  10. 2. Sensor types: resolution (pixel size)<1 metre to 10 kilometre Low resolution     1km -10km (national) 5000 x 5000km www.goes.noaa.gov Medium res. 100 -500 m (regional) 500 x 500km   MODIS High resolution    10-100 m http://landsat.gsfc.nasa.gov/ 200km (1972->80m) (1982->30m) SPOT 60 x 60km (1986-10m) http://gallery.spotimage.com/ Very high 1 - 10 metres (Local)  60 x 60km IkonosQuickbird  Tsunami 2004Geoeye

  11. 3. Types of sensors – active or passive mode Passive – capturing reflected solar or emitted terrestrial radiation Most of the images so far Active – using sensor generated energy RADAR (microwave) LiDAR (visible / near IR) Sensors: Remote Sensing Instruments Full list: http://visibleearth.nasa.gov/view_set.php?sensorName=all New satellite sensors: http://members.home.nl/wim.h.bakker

  12. There are 3 types of image displays: a. RGB composite = 3 ‘bands’ left - visible wavelengths Right – using IR Single band b. Grayscale -> c. Pseudocolour

  13. High-res imagery: large-scale small area http://www.abc.net.au/news/infographics/qld-floods/beforeafter.htm

  14. Low res: large area http://www.ssmi.com/sst/sst_data_daily.html?sat=tmi_amsre

  15. Urban growth: Landsat (since 1972)

  16. Deforestation

  17. 03 2003: Cranbrook Hill – the green University

  18. 06 2006 Cranbrook Hill – the red-green university

  19. remote sensing change applications Lake loss: Aral Sea

  20. Earthshots: satellite images of environmental change Urban expansion: Las Vegas Agricultural expansion- Elburz, Iran Environmental accident: Chernobyl Deforestation: Rondonia (Brazil) desertification - Aral Sea

  21. TERRA satellite 1999 Includes two sensors: MODIS and ASTER MODIS- bands and applications (250 / 500 / 1000m) http://modis.gsfc.nasa.gov/about/specifications.php MODIS- sensing for global change research: http://glcf.umiacs.umd.edu/library/pdf/ieeetgrs36_p1228.pdf

  22. MODIS Rapid Response System Global Fire Maps http://rapidfire.sci.gsfc.nasa.gov

  23. August 22, 2010MODIS image

  24. Castle Glacier, near McBride

  25. Central Coast Mountains, Landsat September 2003

  26. Central Coast Mountains, Landsat August 2006

  27. Landsat image, Mt. Robson Park, 1990 (all Landsat archive -> online in 2009)

  28. Successive glacier extents for Mt. Robson glaciers 1900-2005

  29. Glacier Change in Area (km²) (~ 1985 – 2005) -285 km² -78.8 km² -824 km² - 167 km² -89.1 km² - 453 km² -235 km² - 814 km² -342 km² - 3.4 km² T. Bolch, B.Menounos, R. Wheate

  30. Glacier Retreat Rates (% a-1) (~ 1985 – 2005) -0.44 ± 0.15 -0.79 ± 0.15 -0.35 ± 0.13 Alberta: -1.27 ± 0.17 -1.20 ± 0.16 BC: -0.54 ± 0.15 -0.88 ± 0.16 -1.21 ± 0.23 -0.67 ± 0.15 -0.61 ± 0.18 -0.72 ± 0.14 -1.11 ± 0.24 Whole Inventory: -0.55 ± 0.16 3 - Glacier Changes T. Bolch, B.Menounos, R. Wheate

  31. Glacier Retreat Rates (% a-1) (1985 – 2000; 2000-2005) -0.69 ± 0.23 -0.27 ± 0.19 -1.03 ± 0.70 -0.44 ± 0.53 -0.47 ± 0.33 -1.21 ± 0.96 -0.66 ± 0.23 -0.49 ± 0.26 -0.92 ± 0.74 -0.79 ± 0.81 T. Bolch, B.Menounos, R. Wheate

  32. 1992 2006

  33. (Homathko River Park)

  34. 3D Visualisation of past and future changecreated from air photos, images and mapping Glaciers and vegetation Glacier National Park (Montana) 

  35. MARS720: Is there global change on Mars? http://www.msss.com/mars_images/moc/CO2_Science_rel/ DEM resolution z = 30cm!

  36. Useful websites NASA weekly images http://earthobservatory.nasa.gov/Newsroom/ Earth image of the day: http://earthobservatory.nasa.gov/IOTD/view.php Visible Earth: http://visibleearth.nasa.gov/