https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 24.9 2026-09-30T10:52:06.201Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/3b024dec-76c2-4995-a9ad-7e2bf4feda72 2014-04-14 STANDARDIZED PRECIPITATION INDEX Date=2014-04-15 User Id=128.183.164.42 Entity=Definition Operation=INSERT User Note=added definition System Note=insert Definition New Value=id: null text: An index developed by McKee et al. (1993) to quantify precipitation deficit at a given location for multiple timescales. Standardized precipitation is the difference of precipitation from the mean for a specified time divided by the standard deviation, where the mean and standard deviation are determined from the climatological record. The fact that precipitation is not normally distributed is overcome by applying a transformation (i.e., gamma function) to the distribution. language code: en Date=2014-04-14 User Id=128.183.164.42 Entity=BroaderRelation Operation=INSERT User Note=Insert Concept System Note=add broader relation New Value=STANDARDIZED PRECIPITATION INDEX [3b024dec-76c2-4995-a9ad-7e2bf4feda72,106331] - ATMOSPHERIC PRECIPITATION INDICES [c7477201-761f-4cd1-b986-3e99a0be866b,106325] An index developed by McKee et al. (1993) to quantify precipitation deficit at a given location for multiple timescales.Standardized precipitation is the difference of precipitation from the mean for a specified time divided by the standard deviation, where the mean and standard deviation are determined from the climatological record. The fact that precipitation is not normally distributed is overcome by applying a transformation (i.e., gamma function) to the distribution. 2014-04-15 10:38:26.0