change a bug ,delete an unused variable

[zyune]

This change fix a bug , it delete an unused variable.

Instruction on how to run my code.

• make sure the path for original Maine County level data file and Street level data file are right one
• make a directory county in current directory, mkdir county
• run code by python split_by_maine_county.py

[zyune]

I will explain how above code works.

• 👇🏻First, read file from directory, it's edible, we can put the file waiting to be read at any directory. It give us two geodataframe which is Maine_County and Street_level

  Maine_County = gpd.read_file(
  'Maine_County_Boundary_Polygons_Dissolved_Feature.geojson')
  Street_level = gpd.read_file(
  'eligible-areas-2-22-layer-G8qemhB46k7dh-m1XZ2JM.zip')

• Second, put the data we read from Maine_County_Boundary_Polygons_Dissolved_Feature.geojson in to a dictionary. The key is county name, the value is each county's geometry.

  maine_county_dict = {}
  for i, row in Maine_County.iterrows():
  maine_county_dict[row['COUNTY']] = row.geometry
  maine_county_dict

  👇🏻 This is how the dictionary look like

  

• Third, find the centroid of polygon of Street_level, and set centroid as the geometry of Street_level. This is the soul of my function.

  Street_level['centroid_column'] = Street_level.centroid
  Street_level = Street_level.set_geometry('centroid_column')

  

• Fourth, check if the centroid of street level grid is with in the area of county polygon. and split street level geodataframes into the specified sub geojson

• The input of this function is county name, which should be a string

  def store_county_street_to_file_v2(county_name):
  gdf_list = []
  for index, i in Street_level.iterrows():
      if i.centroid_column.within(maine_county_dict[county_name]):
          gdf_list.append(i)
  gdf = gpd.GeoDataFrame(gdf_list)
  del gdf['centroid_column']
  gdf.set_geometry('geometry')
  gdf.to_file('county/'+county_name+'.geojson')

• Fifth, Run function store_county_street_to_file_v2 for every county in Maine.

  for i in maine_county_dict:
  store_county_street_to_file_v2(i)

[zyune]

That's all