Document how to reingest deltares (#316)

datasets/deltaresfloods/README.md

@@ -1,3 +1,19 @@
 # deltaresfloods PC Tasks
 
-PCTasks code for ingesting deltaresfloods data into the Planetary Computer.
+PCTasks code for ingesting deltaresfloods data into the Planetary Computer.
+These STAC items JSONs are stored as blobs in the `deltaresfloodssa` storage account under the `floods-stac` container.
+You can mount them locally and make modifications before re-ingesting them into the STAC database.
+
+## Item Updates
+After fixing items in the `deltaresfloodssa/floods-stac` container, you may run to reingest them:
+
+```bash
+pctasks dataset process-items xarray-access-fix \
+    -a since "2024-11-17T00:00:00Z" \
+    --dataset datasets/deltaresfloods/dataset.yaml \
+    --is-update-workflow --upsert --submit
+```
+
+Set since to a date strictly before you modified the STAC items in storage.
+For example, if you modified items on December 4, set the since to be any date before December 4.
+`since` must be a full ISO8061 datetime.

datasets/deltaresfloods/dataset.yaml

@@ -1,5 +1,5 @@
 id: deltaresfloods
-image: pccomponentstest.azurecr.io/pctasks-basic:2022.6.16.2
+image: pccomponents.azurecr.io/pctasks-task-base:latest
 target_environment: staging
 
 collections:
@@ -16,4 +16,4 @@ collections:
             extensions:
               - ".json"
     chunk_storage:
-      uri: blob://deltaresfloodssa/floods-etl-data/chunks
+      uri: blob://deltaresfloodssa/floods-etl-data/chunks