feat: add readme

workflows/util/README.md

@@ -0,0 +1,44 @@
+# Contents:
+
+- [create-thumbnails](#Create-Thumbnails)
+
+# Create-Thumbnails
+
+This workflow generates thumbnails for the topo50 and topo250 GeoTiffs and TIFF.
+The thumbnails are used on the LINZ website at the [Topo50](https://www.linz.govt.nz/products-services/maps/new-zealand-topographic-maps/topo50-map-chooser) and [Topo250](https://www.linz.govt.nz/products-services/maps/new-zealand-topographic-maps/topo250-map-chooser) Map Chooser Pages.
+
+Thumbnailing uses two gdal_translate steps.
+Upon completion all standardised TIFF and STAC files will be located within the `./intermediate/` directory of the workflow in the artifacts bucket. From here the thumbnails can be moved to `s3://linz-topographic` using the publish-copy workflow.
+
+## Workflow Input Parameters
+
+| Parameter | Type | Default                           | Description                       |
+| --------- | ---- | --------------------------------- | --------------------------------- |
+| source    | str  | s3://linz-topgraphic/maps/topo50/ | the uri (path) to the input tiffs |
+
+## Workflow Outputs
+
+The output thumbnails will be located within the `./intermediate/` directory of the workflow in the artifacts bucket.
+
+## Workflow Description
+
+```mermaid
+graph TD;
+    aws-list-->create-thumbnails;
+    get-location-->create-thumbnails;
+```
+
+### [aws-list](https://github.com/linz/argo-tasks/blob/master/src/commands/list/list.ts)
+
+Recursively loops through the provided source path and lists all the files within this location. Some listing parameters are currently hard-coded due to the current bespoke purpose of this workflow:
+
+- group: `"2000"`
+- include: `".*.*.tif?$"`
+
+### [get-location](./standardising.yaml)
+
+Finds the output location of this workflow within the artifacts bucket.
+
+### [create-thumbnails](https://github.com/linz/topo-imagery/blob/master/scripts/thumbnails.py)
+
+Runs the bespoke gdal_translate commands to generate thumbnails of the topo50 & topo250 Maps.

workflows/util/create-thumbnails.yaml

@@ -64,7 +64,7 @@ spec:
             "--include",
             ".*.*.tif?$",
             "--group",
-            "1000",
+            "2000",
             "--output",
             "/tmp/file_list.json",
             "{{workflow.parameters.source}}",