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calculating Standardized Precipitation Index (SPI) [message #89898] Fri, 19 December 2014 06:16 Go to next message
Teddy Allen is currently offline  Teddy Allen
Messages: 13
Registered: October 2010
Junior Member
Greetings,
Do any IDL users have experience calculating the standardized precipitation index (SPI)? I would greatly appreciate any support using IDL to calculate SPI.
Thank you,
teddy

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Re: calculating Standardized Precipitation Index (SPI) [message #89901 is a reply to message #89898] Fri, 19 December 2014 22:39 Go to previous messageGo to next message
Fabzi is currently offline  Fabzi
Messages: 305
Registered: July 2010
Senior Member
Hi,


On 19.12.2014 15:16, Teddy Allen wrote:> Greetings,
> Do any IDL users have experience calculating the standardized
precipitation index (SPI)?

There seems to be some programs available for free:
http://drought.unl.edu/MonitoringTools/DownloadableSPIProgra m.aspx

Otherwise you will probably need to roll your own using MPFIT (for example).

Cheers,

Fabien

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Re: calculating Standardized Precipitation Index (SPI) [message #90898 is a reply to message #89898] Fri, 08 May 2015 14:23 Go to previous message
ghusak is currently offline  ghusak
Messages: 1
Registered: May 2015
Junior Member
hi teddy,

i've coded up the SPI in IDL using a conditional gamma distribution accounting for the probability of no rainfall.

i'm not sure if it is standard to post functions to this group (i'm a bit of a newbie), but you can email me or reply here and i can send you the code.

gh

greg husak
ucsb department of geography
On Friday, December 19, 2014 at 6:16:47 AM UTC-8, Teddy Allen wrote:
> Greetings,
> Do any IDL users have experience calculating the standardized precipitation index (SPI)? I would greatly appreciate any support using IDL to calculate SPI.
> Thank you,
> teddy

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