schema

Author: emmanuelmathot

README.md

@@ -5,14 +5,16 @@
 - **Field Name Prefix:** rdr
 - **Scope:** Item, Collection
 - **Extension [Maturity Classification](https://github.com/radiantearth/stac-spec/tree/master/extensions/README.md#extension-maturity):** Proposal
-- **Owner**: @emmanuelmathot @abarciauskas-bgse
+- **Owner**: @emmanuelmathot @abarciauskas-bgse @smohiudd
 
 This document explains the Rendering Extension to the [SpatioTemporal Asset Catalog](https://github.com/radiantearth/stac-spec) (STAC) specification.
 
 Rendering extension aims at providings consumers with the possible rendering of an item or a collection (e.g. on a online map)
 
 - Examples:
   - [Landsat-8 example](examples/item-landsat8.json): Shows the basic usage of the extension in a landsat-8 STAC Item
+  - [Sentinel-2 example](examples/item-sentinel2.json): Shows the basic usage of the extension in a Sentinel-2 STAC Item
+  - [Collection example](examples/collection.json): Shows the basic usage of the extension in a collection
 - [JSON Schema](json-schema/schema.json)
 - [Changelog](./CHANGELOG.md)
 
@@ -60,7 +62,8 @@ The assets MUST be local assets defined in the same item.
 ## Positioning
 
 The positioning of the source assets is defined by their position in the `assets` array.
-Typically, in the case of the composition of a RGB image, the first pointer would be the red band, the second the green band and the third the blue band.
+Typically, in the case of the composition of a RGB image, the first pointer would be the red band,
+the second the green band and the third the blue band.
 
 ```json
 "assets": [ "red", "green", "blue" ]
@@ -79,7 +82,8 @@ It is specified as a 2 dimensions array of delimited Min,Max range per band.
 ]
 ```
 
-A prescaling can also be performed according to the `offset` and `scale` fields value of the [raster](https://github.com/stac-extensions/raster) extension.
+A prescaling can also be performed according to the `offset` and `scale` fields value of the
+[raster](https://github.com/stac-extensions/raster) extension.
 
 ## Dynamic tile servers integration
 
@@ -211,7 +215,8 @@ Obviously, the same rendering can be applied to the source assets without using
 
 ## Links
 
-It is highly suggested to have a web map link in the `links` section of the STAC Item as described in the [Web Map Link extension](https://github.com/stac-extensions/web-map-links) to allow application to
+It is highly suggested to have a web map link in the `links` section of the STAC Item as described in the
+[Web Map Link extension](https://github.com/stac-extensions/web-map-links) to allow application to
 find the tiling endpoint of the dynamic tile server.
 
 ## Contributing

examples/collection.json

@@ -2,12 +2,13 @@
   "stac_version": "1.0.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/item-assets/v1.0.0/schema.json",
-    "https://stac-extensions.github.io/render/v1.0.0/schema.json"
+    "https://stac-extensions.github.io/render/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/virtual-assets/v1.0.0/schema.json"
   ],
   "type": "Collection",
-  "id": "collection",
-  "title": "A title",
-  "description": "A description",
+  "id": "senitnel2-l2a",
+  "title": "Sentinel-2 L2A",
+  "description": "Sentinel-2 L2A data",
   "license": "Apache-2.0",
   "extent": {
     "spatial": {
@@ -29,29 +30,46 @@
       ]
     }
   },
-  "template:new_field": "test",
-  "template:xyz": {
-    "x": 1,
-    "y": 2,
-    "z": 3
-  },
-  "template:another_one": [
-    1,
-    2,
-    3
-  ],
-  "assets": {
-    "example": {
-      "href": "https://example.com/examples/file.xyz",
-      "template:new_field": "test"
-    }
-  },
+  "assets": {},
   "item_assets": {
-    "data": {
+    "ndvi": {
       "roles": [
-        "data"
+        "virtual",
+        "data",
+        "index"
+      ],
+      "type": "image/vnd.stac.geotiff; cloud-optimized=true",
+      "vrt:hrefs": [
+        {
+          "key": "red",
+          "href": "#/assets/red"
+        },
+        {
+          "key": "nir",
+          "href": "#/assets/nir"
+        }
       ],
-      "template:new_field": "test"
+      "title": "Normalized Difference Vegetation Index",
+      "vrt:algorithm": "band_arithmetic",
+      "vrt:algorithm_opts": {
+        "expression": "(B05-B04)/(B05+B04)",
+        "rescale": [
+          [
+            -1,
+            1
+          ]
+        ]
+      }
+    }
+  },
+  "renders": {
+    "ndvi": {
+      "title": "Normalized Difference Vegetation Index",
+      "assets": [
+        "ndvi"
+      ],
+      "resampling": "average",
+      "colormap_name": "ylgn"
     }
   },
   "summaries": {
@@ -62,12 +80,8 @@
   },
   "links": [
     {
-      "href": "https://example.com/examples/collection.json",
+      "href": "https://example.com/examples/collection/sentinel2-l2a.json",
       "rel": "self"
-    },
-    {
-      "href": "https://example.com/examples/item.json",
-      "rel": "item"
     }
   ]
-}
+}

examples/item-landsat8.json

@@ -5,6 +5,7 @@
     "https://stac-extensions.github.io/eo/v1.0.0/schema.json",
     "https://stac-extensions.github.io/projection/v1.0.0/schema.json",
     "https://stac-extensions.github.io/view/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/render/v1.0.0/schema.json",
     "https://stac-extensions.github.io/virtual-assets/v1.0.0/schema.json"
   ],
   "id": "LC08_L1TP_044033_20210305_20210312_01_T1",
@@ -64,6 +65,12 @@
       "rel": "xyz",
       "type": "image/png",
       "title": "RGB composite visualized through a XYZ"
+    },
+    {
+      "rel": "collection",
+      "href": "https://landsat-stac.s3.amazonaws.com/collections/landsat-8-l1.json",
+      "type": "application/json",
+      "title": "The full collection"
     }
   ],
   "assets": {
@@ -231,7 +238,7 @@
       ],
       "gsd": 100
     },
-    "NDVI": {
+    "ndvi": {
       "roles": [
         "virtual",
         "data",
@@ -240,20 +247,26 @@
       "type": "image/vnd.stac.geotiff; cloud-optimized=true",
       "href": "https://landsat-pds.s3.us-west-2.amazonaws.com/c1/L8/044/033/LC08_L1TP_044033_20210305_20210312_01_T1#/assets/NDVI",
       "vrt:hrefs": [
-        "#/assets/B4",
-        "#/assets/B5"
+        {
+          "key": "B4",
+          "href": "#/assets/B4"
+        },
+        {
+          "key": "B5",
+          "href": "#/assets/B5"
+        }
       ],
       "title": "Normalized Difference Vegetation Index",
       "vrt:algorithm": "band_arithmetic",
       "vrt:algorithm_opts": {
-        "expression": "(B05-B04)/(B05+B04)"
-      },
-      "vrt:rescale": [
-        [
-          -1,
-          1
+        "expression": "(B05-B04)/(B05+B04)",
+        "rescale": [
+          [
+            -1,
+            1
+          ]
         ]
-      ]
+      }
     }
   },
   "renders": {