Merge pull request #197 from emilhe/flatgeobuf

Flatgeobuf

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.0.8] - 2023-08-27
+
+### Added
+
+- Add support for `flatgeobuf` file format, including bounding box filtering
+- Add extra optional options (`svg`, `geobuf`, `all`)
+
+### Changed
+
+- Restored support for `geobuf` file format
+
 ## [1.0.7] - 2023-08-27
 
 ### Changed

dash_leaflet/__init__.py

@@ -51,7 +51,7 @@
 
 # region Async modifications
 
-async_resources = ["LocateControl", "MeasureControl", "EditControl.ts", "GeoJSON"]
+async_resources = ["LocateControl", "MeasureControl", "EditControl.ts", "GeoJSON", "geobuf", "flatgeobuf"]
 
 _js_dist.extend(
     [

dash_leaflet/express.py

@@ -1,4 +1,21 @@
+import logging
+
 import dash_leaflet as dl
+import base64
+
+
+def _try_import_geobuf():
+    install_txt = "e.g. via pip by running 'pip install dash-leaflet[geobuf]' or 'pip install dash-leaflet[all]'."
+    try:
+        import geobuf
+        import google.protobuf
+    except ImportError as ex:
+        logging.error(f"Unable to import [geobuf/protobuf]. Please install it, {install_txt}")
+        raise ex
+    if google.protobuf.__version__ != "3.20.0":
+        version_txt = f"The recommended protobuf version is 3.20.0 (you have {google.protobuf.__version__})"
+        logging.warning(f"{version_txt}. You can fix it {install_txt}")
+    return geobuf
 
 
 def categorical_colorbar(*args, categories, colorscale, **kwargs):
@@ -16,3 +33,8 @@ def dicts_to_geojson(dicts, lat="lat", lon="lon"):
             feature["properties"] = {prop: d[prop] for prop in props}
         geojson["features"].append(feature)
     return geojson
+
+
+def geojson_to_geobuf(geojson):
+    geobuf = _try_import_geobuf()
+    return base64.b64encode(geobuf.encode(geojson)).decode()