Merge branch 'diana' into 'main'

added example GraphQL Query for retrieving the values of a property within a polygon

See merge request !6

README.md

@@ -1268,3 +1268,65 @@ query MyQuery {
 ```
 
 Note that in the above example the API only returns 4 results because we dont have more in the dataset. 
+
+
+## Get the values of a property within a polygon
+
+```graphql
+query MyQuery($first: Int, $offset: Int) {
+  wosisLatestProfiles(
+    filter: {
+      layers: { some: { sandValuesExist: true } }
+      geom: {
+        within: {
+          type: "Polygon"
+          coordinates: [
+            [
+              [-5.51345387228184, 9.59126476678042]
+              [-5.51345387228184, 11.0451128553676]
+              [-3.45410758209379, 11.0451128553676]
+              [-3.45410758209379, 9.59126476678042]
+              [-5.51345387228184, 9.59126476678042]
+            ]
+          ]
+        }
+      }
+      and: {
+        continent: { likeInsensitive: "Africa" }
+        countryName: { likeInsensitive: "burkina faso" }
+      }
+    }
+    first: $first
+    offset: $offset
+  ) {
+    latitude
+    longitude
+    layers(first: $first, filter: { sandValuesExist: true }, offset: $offset) {
+      sandValues(first: 6) {
+        profileId
+        profileCode
+        layerId
+        datasetId
+        continent
+        region
+        countryName
+        date
+        upperDepth
+        lowerDepth
+        valueAvg
+        licence
+        methodOptions
+      }
+    }
+  }
+}
+```
+
+Variables:
+
+```json
+{
+  "first": 10,
+  "offset": 0
+}
+``````
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