Index sdii (closes #7)

climix/etc/metadata.yml

@@ -219,3 +219,45 @@ indices:
       long_name: Number of Summer days
       definition: Count of days when TX>25C
       comment: Count of days when daily maximum temperature is above plus 25 degC
+
+  sdii:
+    reference: ETCCDI
+    period:
+      allowed:
+        annual:
+        monthly:
+        seasonal:
+      default: annual
+    output:
+      var_name: sdii
+      standard_name: lwe_precipitation_rate
+      long_name: Average precipitation during Wet Days (SDII)
+      units: mm day-1
+      cell_methods:
+        - time: sum within days
+        - time: mean over days
+    input:
+      var_name: pr
+      standard_name: precipitation_flux
+      cell_methods:
+        - time: sum
+    index_function:
+      name: thresholded_statistics
+      parameters:
+        threshold:
+          kind: quantity
+          long_name: Threshold value for daily precipitation amount
+          standard_name: lwe_precipitation_rate
+          data: 1
+          units: mm day-1
+        condition:
+          kind: operator
+          operator: '>='
+        reducer:
+          kind: reducer
+          reducer: mean
+    ET:
+      short_name: sdii
+      long_name: Simple precipitation intensity index
+      definition: PRCPTOT / Nwetdays
+      comment: Mean daily total precipitation during days having at least 1 mm