impervious-cover.patch

diff --git a/.gitignore b/.gitignore
index 920c705..9631d73 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,73 @@
-venv/
+*$py.class
+*.cover
+*.egg
+*.egg-info/
+*.log
+*.manifest
+*.mo
+*.pot
+*.py[cod]
+*.sage.py
+*.so
+*.spec
+.Python
+.cache
+.coverage
+.coverage.*
+.dmypy.json
+.eggs/
+.env
+.hypothesis/
+.installed.cfg
+.ipynb_checkpoints
+.mypy_cache/
+.nox/
+.pyre/
+.pytest_cache/
+.python-version
+.ropeproject
+.scrapy
+.spyderproject
+.spyproject
+.tox/
+.venv
 .vscode/
+.webassets-cache
+/site
+ENV/
+MANIFEST
+__pycache__/
+__pycache__/o
+build/
+celerybeat-schedule
+coverage.xml
+db.sqlite3
+db.sqlite3-journal
+develop-eggs/
+dist/
+dmypy.json
+docs/_build/
+downloads/
+eggs/
+env.bak/
+env/
+htmlcov/
+instance/
+ipython_config.py
+lib/
+lib64/
+local_settings.py
+nosetests.xml
+output.csv
+parts/
+pip-delete-this-directory.txt
+pip-log.txt
+pip-wheel-metadata/
+profile_default/
+sdist/
+share/python-wheels/
+target/
+var/
+venv.bak/
+venv/
+wheels/
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..0456e9d
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,2 @@
+black
+bpython
diff --git a/requirements.txt b/requirements.txt
index 7a2f9ab..e050c12 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
+area==1.1.1
 geopandas==0.5.1
diff --git a/sample/dataset-gen.py b/sample/dataset-gen.py
index ace0ce6..30d2eb5 100644
--- a/sample/dataset-gen.py
+++ b/sample/dataset-gen.py
@@ -6,15 +6,26 @@ Links:
 - https://geopandas.readthedocs.io/en/latest/gallery/create_geopandas_from_pandas.html
 - https://github.com/scisco/area
 """
+import json
+
+from area import area as calarea
 import geopandas as gpd
 import pandas as pd
-import pyproj
-from area import area as calarea
-import json
+
 
 OSM_SAMPLE_FILE = "osm-sample.geojson"
 TCAD_SAMPLE_FILE = "tcad-sample.json"
-M_TO_FT = 10.7639
+
+
+def area(geometry):
+    """Compute the area of a polygon."""
+    SQM_TO_SQFT = 10.7639
+    area_list = []
+    g = geometry.to_json()
+    polygon = json.loads(g)
+    coordinates = polygon["features"][0]["geometry"]
+    area_list.append(calarea(coordinates) * SQM_TO_SQFT)
+    return area_list
 
 
 def main():
@@ -22,54 +33,47 @@ def main():
     # Load the data sets.
     osm_df = gpd.read_file(OSM_SAMPLE_FILE)
     tcad_df = pd.read_json(TCAD_SAMPLE_FILE)
-    osm_file = open(OSM_SAMPLE_FILE)
-    osm_json = json.load(osm_file)
-    
-    # Calculate the building area
-    area_list = []
-    for i in range(len(osm_json['features'])):
-        #print(osm_json['features'][i]['geometry'])        
-        #print(calarea(osm_json['features'][i]['geometry'])*M_TO_FT)
-        area_list.append(calarea(osm_json['features'][i]['geometry'])*M_TO_FT)
-    osm_df["building area"] = area_list
-    
+
+    # Calculate the building area.
+    osm_df["building area"] = area(osm_df.geometry)
+
     # Create the lookup column.
-    osm_df["addr"] = (
-        osm_df.addr_house.values[0].strip().lower()
-        + " "
-        + osm_df.addr_stree.values[0].strip().lower()
-    )
-    
+    osm_df["addr"] = osm_df.addr_house.values[0].strip() + " " + osm_df.addr_stree.values[0].strip()
+    osm_df["addr"] = osm_df["addr"].str.lower()
     tcad_df["addr"] = (
         tcad_df.SITUS_NUM.map(str)
         + " "
-        + tcad_df.SITUS_STREET.values[0].strip().lower()
+        + tcad_df.SITUS_STREET.values[0].strip()
         + " "
-        + tcad_df.SITUS_STREET_SUFFIX.values[0].strip().lower()
+        + tcad_df.SITUS_STREET_SUFFIX.values[0].strip()
     )
-    #print(tcad_df.head())
+    tcad_df["addr"] = tcad_df["addr"].str.lower()
 
-    # Ensure exact match.
-    join_column = tcad_df.where(tcad_df.addr == osm_df.addr)
-    assert len(join_column) == 1
+    # Merge on exact matches only.
+    join_column = pd.merge(tcad_df, osm_df, on="addr")
 
     # Create a new empty dataframe.
     ndf = pd.DataFrame(
         columns=[
-            "info",
+            "address",
             "units",
             "occupants",
-            "land area",
+            "acreage",
             "ground floor area",
-            "land floor ratio",
+            "land/floor ratio",
             "impervious cover per capita",
         ]
     )
 
     # Populate it.
-    ndf["info"] = osm_df.addr
-    ndf["land area"] = tcad_df.LEGAL_ACREAGE / 1000
+    ndf["address"] = osm_df.addr
+    ndf["acreage"] = (tcad_df.LEGAL_ACREAGE / 10000) * 43560
     ndf["ground floor area"] = osm_df["building area"]
-    
+    ndf["land/floor ratio"] = ndf["ground floor area"] / ndf["acreage"]
+
+    # Save it.
+    ndf.to_csv("output.csv")
+
+
 if __name__ == "__main__":
     main()
diff --git a/sample/pyproject.toml b/sample/pyproject.toml
new file mode 100644
index 0000000..c228223
--- /dev/null
+++ b/sample/pyproject.toml
@@ -0,0 +1,2 @@
+[tool.black]
+line-length = 119
diff --git a/tasks.py b/tasks.py
new file mode 100644
index 0000000..94cdaf6
--- /dev/null
+++ b/tasks.py
@@ -0,0 +1,17 @@
+from invoke import task
+import nox
+
+
+@task(default=True)
+def setup(c):
+    """Setup the developper environment."""
+    c.run(f"nox -f {__name__}.py --envdir .")
+
+
+@nox.session()
+def venv(session):
+    """Setup the developper environment."""
+    # Install dependencies.
+    session.install("--upgrade", "pip", "setuptools")
+    session.install("-r", "requirements.txt")
+    session.install("-r", "requirements-dev.txt")