[geo] Add Deckgl GeoJson layer

superset/assets/javascripts/explore/stores/controls.jsx

@@ -514,6 +514,16 @@ export const controls = {
     }),
   },
 
+  geojson: {
+    type: 'SelectControl',
+    label: t('GeoJSON'),
+    validators: [v.nonEmpty],
+    description: t('Select the geojson column'),
+    mapStateToProps: state => ({
+      choices: (state.datasource) ? state.datasource.all_cols : [],
+    }),
+  },
+
   all_columns_x: {
     type: 'SelectControl',
     label: 'X',

superset/assets/javascripts/explore/stores/visTypes.js

@@ -431,6 +431,40 @@ export const visTypes = {
     },
   },
 
+  deck_geojson: {
+    label: t('Deck.gl - geoJson'),
+    requiresTime: true,
+    controlPanelSections: [
+      {
+        label: t('Query'),
+        expanded: true,
+        controlSetRows: [
+          ['geojson'],
+          ['row_limit']
+        ],
+      },
+      {
+        label: t('Map'),
+        controlSetRows: [
+          ['mapbox_style', 'viewport'],
+        ],
+      },
+      {
+        label: t('Grid'),
+        controlSetRows: [
+          ['grid_size', 'color_picker'],
+        ],
+      },
+    ],
+    controlOverrides: {
+      size: {
+        label: t('Weight'),
+        description: t("Metric used as a weight for the grid's coloring"),
+        validators: [v.nonEmpty],
+      },
+    },
+  },
+
   deck_scatter: {
     label: t('Deck.gl - Scatter plot'),
     requiresTime: true,

superset/assets/visualizations/deckgl/geojson.jsx

@@ -0,0 +1,43 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { GeoJsonLayer } from 'deck.gl';
+
+import DeckGLContainer from './DeckGLContainer';
+
+function DeckGeoJsonLayer(slice, payload, setControlValue) {
+  const fd = slice.formData;
+  const c = fd.color_picker;
+  const data = payload.data.geojson.features.map(d => ({
+      ...d,
+      properties: {
+        fillColor: [c.r, c.g, c.b, 255 * c.a],
+        elevation: 2000
+      },
+  }));
+
+  const layer = new GeoJsonLayer({
+    id: 'geojson-layer',
+    data,
+    filled: true,
+    stroked: false,
+    extruded: true,
+    pointRadiusScale: 100,
+  });
+
+  const viewport = {
+    ...fd.viewport,
+    width: slice.width(),
+    height: slice.height(),
+  };
+  ReactDOM.render(
+    <DeckGLContainer
+      mapboxApiAccessToken={payload.data.mapboxApiKey}
+      viewport={viewport}
+      layers={[layer]}
+      mapStyle={fd.mapbox_style}
+      setControlValue={setControlValue}
+    />,
+    document.getElementById(slice.containerId),
+  );
+}
+module.exports = DeckGeoJsonLayer;

superset/assets/visualizations/main.js

@@ -41,5 +41,6 @@ const vizMap = {
   deck_screengrid: require('./deckgl/screengrid.jsx'),
   deck_grid: require('./deckgl/grid.jsx'),
   deck_hex: require('./deckgl/hex.jsx'),
+  deck_geojson: require('./deckgl/geojson.jsx'),
 };
 export default vizMap;

superset/cli.py

@@ -139,6 +139,9 @@ def load_examples(load_test_data):
     print('Loading DECK.gl demo')
     data.load_deck_dash()
 
+    print('Loading Paris geojson data')
+    data.load_paris_iris_geojson()
+
     if load_test_data:
         print('Loading [Unicode test data]')
         data.load_unicode_test_data()

superset/data/__init__.py

@@ -12,7 +12,7 @@
 import textwrap
 
 import pandas as pd
-from sqlalchemy import BigInteger, Date, DateTime, Float, String
+from sqlalchemy import BigInteger, Date, DateTime, Float, String, Text
 import geohash
 
 from superset import app, db, utils
@@ -1519,3 +1519,33 @@ def load_flights():
     db.session.merge(obj)
     db.session.commit()
     obj.fetch_metadata()
+
+def load_paris_iris_geojson():
+    tbl_name = 'paris_iris_mapping'
+
+    with gzip.open(os.path.join(DATA_FOLDER, 'paris_iris.json.gz')) as f:
+        df = pd.read_json(f)
+        df['features'] = df.features.map(json.dumps)
+
+
+    df.to_sql(
+        tbl_name,
+        db.engine,
+        if_exists='replace',
+        chunksize=500,
+        dtype={
+            'color': String(255),
+            'name': String(255),
+            'features': Text,
+            'type': Text,
+        },
+        index=False)
+    print("Creating table {} reference".format(tbl_name))
+    tbl = db.session.query(TBL).filter_by(table_name=tbl_name).first()
+    if not tbl:
+        tbl = TBL(table_name=tbl_name)
+    tbl.description = "Map of Paris"
+    tbl.database = get_or_create_main_db()
+    db.session.merge(tbl)
+    db.session.commit()
+    tbl.fetch_metadata()

superset/viz.py

@@ -1813,14 +1813,15 @@ def query_obj(self):
 
         gb = []
 
-        spatial = fd.get('spatial')
-        if spatial.get('type') == 'latlong':
-            gb += [spatial.get('lonCol')]
-            gb += [spatial.get('latCol')]
-        elif spatial.get('type') == 'delimited':
-            gb += [spatial.get('lonlatCol')]
-        elif spatial.get('type') == 'geohash':
-            gb += [spatial.get('geohashCol')]
+        if fd.get('spatial'):
+            spatial = fd.get('spatial')
+            if spatial.get('type') == 'latlong':
+                gb += [spatial.get('lonCol')]
+                gb += [spatial.get('latCol')]
+            elif spatial.get('type') == 'delimited':
+                gb += [spatial.get('lonlatCol')]
+            elif spatial.get('type') == 'geohash':
+                gb += [spatial.get('geohashCol')]
 
         if fd.get('dimension'):
             gb += [fd.get('dimension')]
@@ -1925,6 +1926,33 @@ class DeckHex(BaseDeckGLViz):
     verbose_name = _('Deck.gl - 3D HEX')
 
 
+class DeckGeoJson(BaseDeckGLViz):
+
+    """deck.gl's GeoJSONLayer"""
+
+    viz_type = 'deck_geojson'
+    verbose_name = _('Deck.gl - GeoJSON')
+
+    def query_obj(self):
+        d = super(DeckGeoJson, self).query_obj()
+        d['columns'] = [self.form_data.get('geojson')]
+        d['metrics'] = []
+        d['groupby'] = []
+        return d
+
+    def get_data(self, df):
+        fd = self.form_data
+        geojson = {
+            'type': 'FeatureCollection',
+            'features': [json.loads(item) for item in df[fd.get('geojson')]],
+        }
+
+        return {
+            'geojson': geojson,
+            'mapboxApiKey': config.get('MAPBOX_API_KEY'),
+        }
+
+
 class EventFlowViz(BaseViz):
 
     """A visualization to explore patterns in event sequences"""