separation of eo, os and sat

collection-spec/examples/landsat-collection.json

@@ -1,7 +1,9 @@
 {
     "stac_version": "0.9.0-rc1",
     "stac_extensions": [
-      "commons"
+      "commons",
+      "view",
+      "eo"
     ],
     "id": "landsat-8-l1",
     "title": "Landsat 8 L1",

collection-spec/examples/landsat-item.json

@@ -3,6 +3,7 @@
     "stac_extensions": [
         "commons",
         "eo",
+        "view",
         "https://example.com/stac/landsat-extension/1.0/schema.json"
     ],
     "id": "LC08_L1TP_107018_20181001_20181001_01_RT",

extensions/README.md

@@ -60,6 +60,7 @@ An extension can add new fields to STAC entities (content extension), or can add
 | [Scientific](scientific/README.md) (`sci`)                   | Item, Collection | Scientific metadata is considered to be data that indicate from which publication data originates and how the data itself should be cited or referenced. | *Proposal* |
 | [Single File STAC](single-file-stac/README.md) (-)           | ItemCollection   | An extension to provide a set of Collections and Items as a single file catalog. | *Proposal* |
 | [Versioning Indicators](version/README.md) (-)               | Item, Collection | Provides fields and link relation types to provide a version and indicate deprecation. | *Proposal* |
+| [View Geometry](view/README.md)                              | Item             | View Geometry adds metadata related to angles of sensors and other radiance angles that affect the view of resulting data | *Proposal* |
 
 ## Third-party / vendor extensions
 

extensions/commons/README.md

@@ -45,7 +45,7 @@ An incomplete Collection:
 ```
 {
   "stac_version": "0.9.0-rc1",
-  "stac_extensions": ["commons"],
+  "stac_extensions": ["commons", "eo", "view"],
   "id": "landsat-8-l1",
   "title": "Landsat 8 L1",
   "description": "Landat 8 imagery radiometrically calibrated and orthorectified using gound points and Digital Elevation Model (DEM) data to correct relief displacement.",
@@ -75,7 +75,7 @@ An incomplete item:
 ```
 {
   "stac_version": "0.9.0-rc1",
-  "stac_extensions": ["commons", "eo", "sat"],
+  "stac_extensions": ["commons", "eo", "view"],
   "type": "Feature",
   "id": "LC08_L1TP_107018_20181001_20181001_01_RT",
   "bbox": [...],
@@ -97,7 +97,7 @@ The merged Item then looks like this:
 ```
 {
   "stac_version": "0.9.0-rc1",
-  "stac_extensions": ["eo", "sat"],
+  "stac_extensions": ["eo", "view"],
   "type": "Feature",
   "id": "LC08_L1TP_107018_20181001_20181001_01_RT",
   "bbox": [...],

extensions/view/README.md

@@ -12,7 +12,7 @@ This document explains the fields of the View Geometry Extension to a STAC Item.
 | Field Name       | Type                     | Description |
 | ---------------- | ------------------------ | ----------- |
 | view:off_nadir       | number               | The angle from the sensor between nadir (straight down) and the scene center. Measured in degrees (0-90). |
-| view:incidence_angle | number               | The incidence_angle angle is the angle between the vertical (normal) to the intercepting surface and the line of sight back to the satellite at the scene center. Measured in degrees (0-90). |
+| view:incidence_angle | number               | The incidence_angle is the angle between the vertical (normal) to the intercepting surface and the line of sight back to the satellite at the scene center. Measured in degrees (0-90). |
 | view:azimuth         | number               | Viewing azimuth angle. The angle measured from the sub-satellite point (point on the ground below the platform) between the scene center and true north. Measured clockwise from north in degrees (0-360). |
 | view:sun_azimuth     | number               | Sun azimuth angle. From the scene center point on the ground, this is the angle between truth north and the sun. Measured clockwise in degrees (0-360). |
 | view:sun_elevation   | number               | Sun elevation angle. The angle from the tangent of the scene center point to the sun. Measured from the horizon in degrees (0-90). |
@@ -29,6 +29,7 @@ Example:
 {
   "stac_version": "0.9.0-rc1",
   "stac_extensions": [
+    "view",
     "sat"
   ],
   "id": "20171110",
@@ -55,4 +56,4 @@ Example:
 
 ## Extensions
 
-The [extensions page](../README.md) gives an overview about related extensions. Of particular relevance to Overhead Sensor data.
+The [extensions page](../README.md) gives an overview about related extensions. Of particular relevance to View Geometry data.

extensions/view/examples/example-landsat8.json

@@ -0,0 +1,86 @@
+{
+    "stac_version": "0.9.0-rc1",
+    "stac_extensions": [
+      "sat",
+      "view"
+    ],
+    "id": "LC08_L1TP_107018_20181001",
+    "collection": "landsat-8-l1",
+    "type": "Feature",
+    "bbox": [
+        148.13933,
+        59.51584,
+        152.52758,
+        60.63437
+    ],
+    "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+            [
+                [
+                    152.52758,
+                    60.63437
+                ],
+                [
+                    149.1755,
+                    61.19016
+                ],
+                [
+                    148.13933,
+                    59.51584
+                ],
+                [
+                    151.33786,
+                    58.97792
+                ],
+                [
+                    152.52758,
+                    60.63437
+                ]
+            ]
+        ]
+    },
+    "properties": {
+        "datetime": "2018-10-01T01:08:32.033Z",
+        "view:sun_azimuth": 168.8989761,
+        "view:sun_elevation": 26.32596431,
+        "platform": "landsat-8",
+        "instruments": ["oli", "tirs"],
+        "constellation": "landsat",
+        "sat:orbit_state": "ascending",
+        "view:off_nadir": 0
+    },
+    "assets": {
+        "blue": {
+            "href": "https://landsat-pds.s3.amazonaws.com/c1/L8/107/018/LC08_L1TP_107018_20181001_20181001_01_RT/LC08_L1TP_107018_20181001_20181001_01_RT_B2.TIF",
+            "type": "image/tiff; application=geotiff",
+            "title": "Band 2 (blue)"
+        },
+        "green": {
+            "href": "https://landsat-pds.s3.amazonaws.com/c1/L8/107/018/LC08_L1TP_107018_20181001_20181001_01_RT/LC08_L1TP_107018_20181001_20181001_01_RT_B3.TIF",
+            "type": "image/tiff; application=geotiff",
+            "title": "Band 3 (green)"
+        },
+        "red": {
+            "href": "https://landsat-pds.s3.amazonaws.com/c1/L8/107/018/LC08_L1TP_107018_20181001_20181001_01_RT/LC08_L1TP_107018_20181001_20181001_01_RT_B4.TIF",
+            "type": "image/tiff; application=geotiff",
+            "title": "Band 4 (red)"
+        },
+        "thumbnail": {
+            "href": "https://landsat-pds.s3.amazonaws.com/c1/L8/107/018/LC08_L1TP_107018_20181001_20181001_01_RT/LC08_L1TP_107018_20181001_20181001_01_RT_thumb_large.jpg",
+            "title": "Thumbnail image",
+            "type": "image/jpeg"
+        },
+        "index": {
+            "href": "https://landsat-pds.s3.amazonaws.com/c1/L8/107/018/LC08_L1TP_107018_20181001_20181001_01_RT/index.html",
+            "type": "text/html",
+            "title": "HTML index page"
+        }
+    },
+    "links": [
+        {
+            "rel": "collection",
+            "href": "http://landsat-stac.s3.amazonaws.com/landsat-8-l1/catalog.json"
+        }
+    ]
+}

extensions/view/json-schema/schema.json

@@ -1,8 +1,8 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "$id": "schema.json#",
-  "title": "Overhead Sensor Extension",
-  "description": "STAC Overhead Sensor Extension to a STAC Item.",
+  "title": "View Geometry Extension",
+  "description": "STAC View Geometry Extension to a STAC Item.",
   "allOf": [
     {
       "$ref": "../../../item-spec/json-schema/item.json"