How can I obtain free satellite imagery for Australia? I want to find the extend of flood in specific time. I have already tried land-sat.But unfortunately there is no data available for that specific period.

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    Have you searched the data accessible on the Geoscience Australia website? ga.gov.au/search/index.html – Chris P Nov 17 '14 at 13:03
  • For which year do you need data ? – radouxju Nov 17 '14 at 15:01
  • at cost au.nearmap.com has historical imagery for floods - it is expensive to get satellites into orbit. – Mapperz Nov 17 '14 at 20:45
  • I need data for March 2012 NSW flood – Mike Nov 19 '14 at 6:37

ASTER and MODIS both have global coverage and are suited for larger scale flood analysis. ASTER has a temporal resolution of 16 days and contains 14 spectral bands in VNIR (15m), SWIR (30m) and TIR (90m). Note that ASTER SWIR data acquired from late April 2008 to the present exhibit anomalous saturation of values and anomalous striping. MODIS has a higher return rate (1-2 days), although has a lower spatial resolution (500m, 1km) than ASTER. They are available from a variety of sources:

  1. Earth Explorer
  2. Glovis
  3. Reverb

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