I'm working on global climate projections raster maps. My starting data are global raster maps of daily future climate, where every map represent one single day (e.g. I have 365 maps for 1 year). Furthermore, for every cell in the single map I have a temperature value.
I want to create maps of indices of extreme climatic events (ECEs) based on my starting data. An example of ECE indices is "number of days over 25°C in a year" (SD, Summer Days).
- I was able to do it for single maps. Use the
"IF"operation in the Raster Calculator. The output is a binary global map for a single day, where 1 are the
"t > 20°C"values of the map and 0 are the
"t < 20°C"values.
- I wasn't able to do it, not even with just two maps.
"SUM"the binary maps all together (365 maps for 1 year, but possibly I would like to have a 20 year mean), so that I can get an indices as "number of days over 25°C in a year".
My real questions are:
- Why the
"SUM"formula does not work with just two raster (if the
"IF"formula works)? (Less important question, I think I can solve it somehow)
- Is it possible to compute together the
"SUM"operations in the Raster Calculator? (Important question)
- Is it possible to summarize together all the formulas related to one year (or more years) in just one calculation (for one year, it would mean: 365
"SUM")? (Much Important question)