Merge pull request #44 from wri/feature/alos_dsm

add ALOS DSM layer

city_metrix/layers/__init__.py

@@ -15,3 +15,4 @@
 from .average_net_building_height import AverageNetBuildingHeight
 from .open_buildings import OpenBuildings
 from .tree_canopy_hight import TreeCanopyHeight
+from .alos_dsm import AlosDSM

city_metrix/layers/alos_dsm.py

@@ -0,0 +1,21 @@
+import ee
+import xee
+import xarray as xr
+
+from .layer import Layer, get_image_collection
+
+
+class AlosDSM(Layer):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+    def get_data(self, bbox):
+        dataset = ee.ImageCollection("JAXA/ALOS/AW3D30/V3_2")
+        alos_dsm = ee.ImageCollection(dataset
+                                      .filterBounds(ee.Geometry.BBox(*bbox))
+                                      .select('DSM')
+                                      .mean()
+                                      )
+        data = get_image_collection(alos_dsm, bbox, 30, "ALOS DSM").DSM
+
+        return data