Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
If the input temperatures are scaled, e.g. as input = Celsius * 10, then the inscale option must be set to 10. Similarly, the outscale option is by default 10, and temperature output is in this case Celsius * 10. Exceptions are BIO3, BIO4, and BIO15 which are always multiplied with 100 (see below). The reason that outscale is set to 10 by default is that the output layers are integers (for compatibility with WORLDCLIM), and a scaling factor of 10 (or higher power of 10) ensures a minimum of precision.
The second option is to divide the year in 12 quarters. With this option the quarterly parameters are not aligned to any calendar quarters. Instead, the first quarter refers to Jan - Mar, the second quarter to Feb - Apr, and the last quarter to Dec - Feb. This is the same method as used by the biovars function in the R package dismo and how the bioclimatic variables provided by Worldclim were computed. This option should be used when long-term averages are used as input.
BIO 01 Annual mean temperature as the mean of the monthly temperatures (°C)
BIO 02 Mean diurnal range as the mean of monthly (max temp - min temp) (°C)
BIO 03 Isothermality (BIO2/BIO7 * 100)
BIO 04 Temperature Seasonality (standard deviation * 100)
BIO 05 Max Temperature of Warmest Month (°C)
BIO 06 Min Temperature of Coldest Month (°C)
BIO 07 Temperature Annual Range (BIO5 - BIO6) (°C)
BIO 08 Mean Temperature of Wettest Quarter (°C)
BIO 09 Mean Temperature of Driest Quarter (°C)
BIO 10 Mean Temperature of Warmest Quarter (°C)
BIO 11 Mean Temperature of Coldest Quarter (°C)
BIO 12 Annual Precipitation (mm)
BIO 13 Precipitation of Wettest Month (mm)
BIO 14 Precipitation of Driest Month (mm)
BIO 15 Precipitation Seasonality (Coefficient of Variation * 100)
BIO 16 Precipitation of Wettest Quarter (mm)
BIO 17 Precipitation of Driest Quarter (mm)
BIO 18 Precipitation of Warmest Quarter (mm)
BIO 19 Precipitation of Coldest Quarter (mm)
r.bioclim tmin=`g.list type=rast pat=tmin_* map=. sep=,` \ tmax=`g.list type=rast pat=tmax_* map=. sep=,` \ prec=`g.list type=rast pat=prec_* map=. sep=,` \ out=worldclim_ workers=4
Available at: r.bioclim source code (history)
Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55
Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
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© 2003-2023 GRASS Development Team, GRASS GIS 7.8.8dev Reference Manual