- added note anout GeoJSON (#186)

Author: doublebyte1

workshop/jupyter/content/notebooks/07-visualization.ipynb

@@ -802,6 +802,15 @@
     "\togr2ogr -s_srs EPSG:4326 -t_srs EPSG:3857 populated_places.3857.json populated_places.json\n"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<div class=\"alert alert-block alert-warning\">\n",
+    "<b>Warning:</b> Although GDAL/OGR, bokeh and many other tools support a crs member in GeoJSON, please note that the latest version of the <a href=\"https://datatracker.ietf.org/doc/html/rfc7946\">GeoJSON spec<a> does not support specifying Coordinate Reference Systems and always assumes a default WGS84 crs. If you need crs support in GeoJSON, you consider the OGC <a href=\"https://github.com/opengeospatial/ogc-feat-geo-json\">JSON-FG candidate Standard</a> from OGC.\n",
+    "</div>"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,