Geographic Information Systems Asked by sutan on August 20, 2020
I have this particular json and I want to make the JSON into a GeoDataFrame (with geometry and its attributes); How to set the geometry and attributes to a geodataframe?
I have tried using geopandas.read_file()
and it returned an error: "expected string or bytes-like object";
I also tried geopandas.GeoDataFrame.from_features()
but it returns this table (which is the problem):
I want it to look like something like this (a geometry column, and the other attribute columns):
I am aware of Esri’s ArcGIS API for Python but, in this case, I can’t use ArcGIS API or ArcPy.
Thank you.
GeoPandas uses Shapely to define geometry. so Using shapely we can define a function to grab the json, cleans it, and convert the geometry into a shapely object. Here's how to convert the json into a GeoDataFrame:
with link = web service, then;
# function "get_line" should retrieve the JSON and returns a GeoDataFrame
# if it's a polygon, then the import shapely must be "Polygon" and ...
# ... the ['paths'] must be ['rings']
def get_line(base_link, objid):
from shapely.geometry import LineString
iterator=objid
link=base_link + "/" + str(objid) + "?f=pjson"
print(link)
js = r.get(link, verify=False).json()
df = pd.DataFrame(js['feature']['attributes'], index=[0])
df['geom']=LineString(js['feature']['geometry']['paths'][0])
crs = {'init': 'epsg:4326'}
gdf = gpd.GeoDataFrame(df, crs=crs).set_geometry(df['geom'])
return gdf
link = "insert link to web service, here"
get_line(link,1)
Correct answer by sutan on August 20, 2020
I'm guessing r in r.get is the requests library and its return a json object? If so, you can just convert your request to a string and use read_file into a GeoDataFrame.
url = "https://..."
gdf = gpd.read_file(r.get(url).text)
Answered by tynowell on August 20, 2020
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