Release 2022.4 changelog

docs/overview/changelog.md

@@ -2,6 +2,31 @@
 
 This document highlights the new features, datasets, and breaking changes between each release of the Planetary Computer.
 
+## June 2022
+
+This month's release includes many changes to our website tools, support for bulk STAC queries, several new datasets, and updates to our open-source dependencies and libraries.
+
+### Highlights
+
+- The Catalog and Explorer interfaces have been redesigned to accommodate the increased number of datasets available in the Planetary Computer.
+- The entire website, including the Explorer, Catalog, and Documentation pages, have all been updated to work well on most mobile devices.
+- We now provide snapshots of our STAC items for most of our collections as [GeoParquet](https://github.com/opengeospatial/geoparquet) datasets to support bulk STAC queries.
+
+### Bulk STAC queries with GeoParquet
+
+Many of our collections now include a `geoparquet-items` collection-level asset that links to a [GeoParquet](https://github.com/opengeospatial/geoparquet) dataset in Azure Blob Storage. Each row in these Parquet datasets is a STAC item. While most users should continue to use the normal STAC API, these Parquet datasets are a nice complement for workloads that need to return very many STAC items.
+
+See [Bulk STAC item queries with GeoParquet](../quickstarts/stac-geoparquet) for more.
+
+### New datasets
+
+This release includes several new datasets in our STAC API. Each of these links to the dataset details page, which includes an example notebook.
+
+- [Deltares Floods](https://planetarycomputer.microsoft.com/dataset/deltares-floods)
+- [Deltares Water Availability](https://planetarycomputer.microsoft.com/dataset/deltares-water-availability)
+- [Microsoft Buildings Footprint](https://planetarycomputer.microsoft.com/dataset/ms-buildings)
+- [Kwando & Upper Zambezi Rivers HydroForecast](https://planetarycomputer.microsoft.com/dataset/kaza-hydroforecast)
+
 ## May 2022
 
 This release includes many new datasets, API enhancements, and updates to libraries.

docs/overview/explorer.md

@@ -21,15 +21,22 @@ features are visible at different pixel resolutions.
 
 ## Selecting datasets
 
-Datasets that are available in the Explorer can be selected in the top dropdown,
-which is grouped by category.
+Datasets that are available in the Explorer can be browsed and selected by clicking the Dataset Selector at the top of the page
 
-```{image} images/explorer-ds.jpg
-:height: 200
+```{image} images/explorer-ds-selector.png
+:height: 150
 :name: Planetary Computer Explorer dataset selection
 :class: no-scaled-link
 ```
 
+In the catalog popup, you can view datasets by category and filter results against dataset metadata. The interface is similar to the main Data Catalog page. Select a dataset by click on the dataset card.
+
+```{image} images/explorer-ds-catalog.png
+:height: 550
+:name: Planetary Computer Explorer dataset selection catalog
+:class: no-scaled-link
+```
+
 Datasets can also be opened in the Explorer directly from their
 [catalog][pc-catalog] page. These buttons will launch the Explorer at a
 location that has data availability and an interesting visualization.