add nutrient load metadata

data/h3_data_importer/contextual_layers_metadata/h3_grid_limiting_nutrients_global_metadata.json

@@ -0,0 +1,42 @@
+{
+    "$schema": "./contextual_metadata_schema.json",
+    "name": "Modeled limiting nutrients",
+    "description": "Geographical distribution and estimated area occupied by four different types of catchments across the globe based on predicted median nutrient concentrations. These catchments are classified as either 'acceptable periphyton growth and N-limitation' (catchment type 1),  'undesirable periphyton growth and N-limitation' (catchment type 2), 'acceptable periphyton growth and P-limitation' (catchment type 3) or 'undesirable periphyton growth and P-limitation' (catchment type 4) ",
+    "aggType": "mode",
+    "legend": {
+        "name": "Modeled limiting nutrients",
+        "id": "",
+        "unit": null,
+        "min": 0,
+        "type": "category",
+        "items": [
+            {
+                "value": 0,
+                "label": "No Data",
+                "color": "#9c9c9c"
+            },
+            {
+                "value": 1,
+                "label": "N-limited growth acceptable",
+                "color": "#d2ff73"
+            },
+            {
+                "value": 2,
+                "label": "N-limited growth undesirable",
+                "color": "#3aa809"
+            },
+            {
+                "value": 3,
+                "label": "P-limited growth acceptable",
+                "color": "#fea87c"
+            },
+            {
+                "value": 4,
+                "label": "P-limited growth undersiable",
+                "color": "#a73800"
+            }
+        ]
+    },
+    "source": "McDowell et al. (2020)",
+    "license": "CC BY 4.0"
+}

data/h3_data_importer/contextual_layers_metadata/h3_grid_nutrient_load_global_metadata.json

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+{
+    "$schema": "./contextual_metadata_schema.json",
+    "name": "Nutrient Load Reduction",
+    "description": "Geospatial representation indicating the extent to which basin-wide nutrient loads need to be reduced to achieve the desired state of nature in various regions. This layer illustrateS the required proportional nutrient load reduction for each specific watershed or basin to no longer be considered polluted and to attain the desired instream nutrient concentration.",
+    "aggType": "mode",
+    "legend": {
+        "name": "Nutrient Load Reduction",
+        "id": "",
+        "unit": "",
+        "min": 0,
+        "type": "range",
+        "items": [
+            {
+                "value":  10,
+                "label": "10%",
+                "color": "#f6eff7"
+            },
+            {
+                "value": 30,
+                "label": "30%",
+                "color": "#bdc9e1"
+            },
+            {
+                "value": 50,
+                "label": "50%",
+                "color": "#67a9cf"
+            },
+            {
+                "value": 60,
+                "label": "60%",
+                "color": "#1c9099"
+            },
+            {
+                "value": 90,
+                "label": "90%",
+                "color": "#016c59"
+            }
+        ]
+    },
+    "source": "McDowell et al. (2020)",
+    "license": "CC BY 4.0"
+}