Add GeoPandas and DuckDB usage instructions

docs/using-source/data-proxy.md

@@ -62,10 +62,62 @@ See [Upload Your Data](/data-upload#get-credentials-with-the-source-cli-recommen
 
 If you don't have the AWS CLI installed, follow the [AWS CLI Getting Started Guide](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html).
 
+## Using GeoPandas
+
+For working with spatial data using Python, you can use [GeoPandas](https://geopandas.org/). You'll need Python and the `geopandas` and `s3fs` packages.
+
+```sh
+pip install geopandas s3fs
+```
+
+Then, in your code:
+
+```python
+import geopandas
+
+# Use the Data Proxy
+storage_options = {
+    "endpoint_url": "https://data.source.coop",
+    "anon": True
+}
+
+gdf = geopandas.read_parquet(
+    "s3://kerner-lab/fields-of-the-world/vietnam/chips_vietnam.parquet",
+    storage_options=storage_options,
+)
+```
+
+The code for using pandas (for non-geospatial data) is similar.
+
+## Using [DuckDB](https://duckdb.org/)
+
+```sql
+-- https://duckdb.org/docs/current/core_extensions/httpfs/overview#installation-and-loading
+INSTALL httpfs;
+LOAD httpfs;
+
+-- https://duckdb.org/docs/current/core_extensions/spatial/overview#installing-and-loading
+INSTALL spatial;
+LOAD spatial;
+
+CREATE OR REPLACE SECRET source_coop (
+    TYPE s3,
+    PROVIDER config,
+    ENDPOINT 'data.source.coop',
+    URL_STYLE 'path'
+    -- If you're working with multiple S3-compatible sources (beyond the Data Proxy), you'll want to only apply this SECRET to the Source Cooperative account name(s).
+    -- https://duckdb.org/docs/current/configuration/secrets_manager#creating-multiple-secrets-for-the-same-service-type
+    -- SCOPE 's3://kerner-lab'
+);
+
+SELECT *
+FROM 's3://kerner-lab/fields-of-the-world/vietnam/chips_vietnam.parquet';
+```
+
 ## Current Status
 
 The Source Data Proxy is currently in beta. We're working to make performance indistinguishable from accessing objects directly via AWS S3.
 
 ## Uploading Data Through the Source Data Proxy
 
-Uploading data through the Source Data Proxy is currently disabled while we work on new, easier, and more secure ways to upload data. If you need to upload data, please contact hello@source.coop.
+Uploading data through the Source Data Proxy is currently disabled while we work on new, easier, and more secure ways to upload data. If you need to upload data, please contact hello@source.coop.