Palmer Modified Drought Index

The term "Palmer Drought Index" has been used collectively to represent multiple indices. This index is simply a water balance model which analyzes precipitation and temperature, and used as a tool to measure meteorological and hydrological drought across space and time. All versions of the index uses the Versatile Soil Moisture Budget to model the movement of water within the system, and a daily Priestly-Taylor model to estimate evapotranspiration.

The Palmer Drought Index (PDI) uses monthly temperature and precipitation data to calculate a simple soil water balance. The index is a relative measure that typically ranges from -4 (extremely dry) to +4 (extremely wet) and represents how soil moisture availability differs from that expected for a given place and time of year. The PDI includes a "memory" component that considers past conditions and persistence of soil moisture surplus or deficit.

The Modified Palmer Drought Index (PMDI) is obtained from the sum of the wet and dry terms weighted by probability values. The PMDI has the same value as the PDI during established dry or wet spells but can be different during transition periods.

Simple

Date ( RI_367 )
2017-05-05
Date ( RI_366 )
2017-05-05
RI_414
  Government of Canada; Agriculture and Agri-Food Canada; Science and Technology Branch
Canada
https://agriculture.canada.ca
RI_412
  Government of Canada; Agriculture and Agri-Food Canada; Science and Technology Branch
Canada
https://agriculture.canada.ca/
Presentation form
mapDigital;carteNumérique RI_391
Status
completed; complété RI_593
Maintenance and update frequency
asNeeded; auBesoin RI_540
Keywords ( RI_529 )
  • PDI
  • agclimate
  • PMDI
Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
  • Crops
  • Agriculture
  • Farmlands
  • Precipitation
  • Temperature
Use limitation
Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)
Access constraints
license; licence RI_606
Use constraints
license; licence RI_606
Spatial representation type
vector; vecteur RI_635
Spatial representation type
grid; grille RI_636
Metadata language
eng; CAN
Topic category
  • Climatology, meteorology, atmosphere
Begin date
2012-09-03
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Reference system identifier
http://www.epsg.org/ / EPSG:3857 / 8.3.4
RI_414
  Government of Canada; Agriculture and Agri-Food Canada; Science and Technology Branch
Canada
https://agriculture.canada.ca
OnLine resource
Data Product Specification (English) ( HTTPS )

Supporting Document;PDF;eng

OnLine resource
Palmer Drought Index ( HTTPS )

Web Service;WMS;zxx

OnLine resource
Using AAFC Climate Services (French) ( HTTPS )

Supporting Document;PDF;fra

OnLine resource
Data Product Specification (French) ( HTTPS )

Supporting Document;PDF;fra

OnLine resource
Agroclimate Interactive Maps (English) ( HTTPS )

Application;HTML;eng

OnLine resource
Agroclimate Interactive Maps (French) ( HTTPS )

Application;HTML;fra

OnLine resource
Pre-packaged GeoTIF files (No linguistic component) ( HTTPS )

Dataset;GeoTIF;zxx

OnLine resource
Using AAFC Climate Services (English) ( HTTPS )

Supporting Document;PDF;eng

OnLine resource
Palmer Drought Index ( ESRI REST: Image Service )

Web Service;ESRI REST;zxx

OnLine resource
Palmer Drought Index ( ESRI REST: Image Service )

Web Service;ESRI REST;zxx

File identifier
719add0d-55f0-422f-928c-2092ab10f89b XML
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Hierarchy level
series; série RI_623
Date stamp
2024-08-13T11:15:54
Metadata standard name
North American Profile of ISO 19115:2003 - Geographic information - Metadata
Metadata standard version
CAN/CGSB-171.100-2009
RI_414
  Government of Canada; Agriculture and Agri-Food Canada; Science and Technology Branch
Canada
https://agriculture.canada.ca
 
 

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