Change Detection

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4 Terms

1
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Define image differencing:

  • One image is subtracted from the other

  • Values used are reflectance wavebands or spectral indices

  • +ve and -ve values can tell us information


2
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What are some important considerations in image differencing?

  • Images need to be from the same time of year to reduce ‘noise’ e.g. from normal vegetation change

  • Some natural ‘noise’ is expected - when does change become significant/mappable?


3
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Define image timeseries analysis:

Image differencing over a series of images.

4
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How can the temporal frequency of an image timeseries vary?

Daily to annual