I am trying to calculate the temperature of MOD11A1 and I can't find the expression of band math. How the expression temp < 273 could be written at band math?

2 Answers 2


If you want a binary layer wth values before or under 273, you can use the build mask tools (basic tools > Masking > build mask)

in IDL, you can use the following relational operators

gt for >
ge for >=
eq for ==
le for <=
lt for <
  • thank you so much for you useful answer. Another related question, how we can divide two bands?
    – confused
    Apr 3, 2016 at 16:30
  • in order to make your question usefull for other, please don't ask questions in comment but ask a new question instead.
    – radouxju
    Apr 3, 2016 at 19:03

You should use "B1 lt 273" where B1 is a LST band.

  • please include an explanation to back up your answer
    – Midavalo
    Mar 8, 2016 at 3:44

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