Fix providers usage in pdal-to-stac.py

Author: kylemann16

examples/example-autzen.json

@@ -74,14 +74,16 @@
   "id": "autzen-classified.copc.laz",
   "links": [
     {
-      "href": "https://github.com/PDAL/data/raw/master/autzen/autzen-classified.copc.laz",
+      "href": "./example-autzen.json",
       "rel": "self"
+    },
+    {
+      "href": "https://github.com/PDAL/data/blob/master/LICENSE",
+      "rel": "license"
     }
   ],
   "properties": {
     "datetime": "0001-01-02T00:00:00Z",
-    "item:license": "LICENSE",
-    "item:provider": "USGS",
     "pc:count": 10653336,
     "pc:density": 4.664071112,
     "pc:schemas": [
@@ -275,7 +277,7 @@
         "name": "ScanAngleRank",
         "position": 9,
         "stddev": 8.484304657,
-        "variance": 71.9834255
+        "variance": 71.98342551
       },
       {
         "average": 126.4052859,
@@ -359,6 +361,16 @@
       }
     ],
     "pc:type": "lidar",
+    "providers": [
+      {
+        "description": "United States Geological Survey",
+        "name": "USGS",
+        "roles": [
+          "producer"
+        ],
+        "url": "https://www.usgs.gov"
+      }
+    ],
     "title": "USGS 3DEP LiDAR"
   },
   "stac_extensions": [

examples/pdal-to-stac.py

@@ -74,14 +74,21 @@ def convertBBox(obj):
 output['type'] = 'Feature'
 
 assets = {'data': {'href': filename}}
-#assets['thumbnail'] =
 properties = {}
 
 properties['pc:schemas'] = info['schema']['dimensions']
 properties['pc:statistics'] = stats['statistic']
 properties['title'] = "USGS 3DEP LiDAR"
-properties['item:provider'] = "USGS"
-properties['item:license'] = 'LICENSE'
+properties['providers'] = [
+      {
+        "name": "USGS",
+        "description": "United States Geological Survey",
+        "roles": [
+          "producer",
+        ],
+        "url": "https://www.usgs.gov"
+      }
+]
 properties['pc:type'] = 'lidar' # eopc, lidar, radar, sonar
 try:
     properties['pc:density'] = boundary['avg_pt_per_sq_unit']
@@ -96,10 +103,13 @@ def convertBBox(obj):
 output['stac_extensions'] = ['https://stac-extensions.github.io/pointcloud/v1.0.0/schema.json']
 output['stac_version'] = '1.0.0'
 
-link = {'rel':'self',"href":filename}
-output['links'] = [link]
-
 example_dir = Path(__file__).parent
-with open(example_dir/'example-autzen.json', 'w') as autzen_out:
+out_filename = str(example_dir/'example-autzen.json')
+
+self_link = {'rel':'self',"href":'./example-autzen.json'}
+lic_link = {'rel':'license',"href":'https://github.com/PDAL/data/blob/master/LICENSE'}
+output['links'] = [self_link, lic_link]
+
+with open(out_filename, 'w') as autzen_out:
     autzen_out.write(json.dumps(output, sort_keys=True, indent=2,
                                 separators=(',', ': ')))