topic Re: Arcpy create a polyline by csv fields in Python Questions

Arcpy create a polyline by csv fields

DEVAPP — Fri, 10 Dec 2021 20:08:38 GMT

Hi,

I have a csv file with different fields:

Address,route
First Av,[(39.72412, -104.9995), (39.72412, -105.00091), (39.72417, -105.00157), (39.72422, -105.00159)]
Second Av,[(39.72412, -104.9995), (39.72412, -105.00091), (39.72417, -105.00157), (39.72422, -105.00159)]
Street Av,[(39.72412, -104.9995), (39.72412, -105.00091), (39.72417, -105.00157), (39.72422, -105.00159)]
Street Av,[(39.72412, -104.9995), (39.72412, -105.00091), (39.72417, -105.00157), (39.72422, -105.00159)]‍‍‍‍‍

Whith this code i create a polyline use the array coordinate field by csv:

import arcpy,csv,ast
csvfile =r'lyft_1.csv'
folder=r'C:\Temp'
shapename=r'PolylineCSV.shp'
spatref_epsg=3006



 icur=arcpy.da.InsertCursor(os.path.join(folder,shapename),'SHAPE@')
 with open(csvfile,'rb') as f:
     reader = csv.DictReader(f)
 for row in reader:
     listrow=ast.literal_eval(row["route"]) 
     line=arcpy.Polyline(arcpy.Array([arcpy.Point(*coords) for coords in listrow]))
     icur.insertRow((line,))

 del icur‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

But how i can insert the field address with array coordinate into Polyline?

Re: Arcpy create a polyline by csv fields

VinceAngelo — Thu, 12 Oct 2017 18:30:30 GMT

Note: Cross-posted to GIS Stack Exchange, but placed on on hold there as unclear.

There are several confusing aspects to this post. First off is the conflict between apparent geographic decimal degrees input (albeit in reversed order -- {Y,X} instead of {X,Y}) and the spatref_epsg variable (which asserts a projected coordinate system over the Caspian Sea, which is nowhere near the central Colorado implied by -105,39). In addition, your indent scheme is wrong as posted here, since the for loop isn't inside the with which processes the input file (the answer this new question is based upon has correct indentation). You also seem to want to use the first field in the CSV, but only insert insert the geometry field into the shapefile. Finally, the insertRow request accepts a row array, but you aren't providing an array parameter.

Please update your question to have the correct Python indentation and information about the SpatialReference of the data target. It would probably help to instrument your Python code with print or arcpy.AddMessage so you can share information on the flow of control exhibited by your code.

- V

Re: Arcpy create a polyline by csv fields

DEVAPP — Fri, 10 Dec 2021 20:08:41 GMT

Hi Vince,

thanks for your reply.

You are right! The coordinate are inverted and epsg is 4326.

I have solved my problem and this is the update code:

csvfile = arcpy.GetParameterAsText(0)
folder= arcpy.GetParameterAsText(1)
name = arcpy.GetParameterAsText(2)
shapename= name + ".shp"
spatref_epsg=4326
path = folder + "\\" + shapename

# Create Feature
arcpy.CreateFeatureclass_management(out_path=folder, out_name=shapename,geometry_type='POLYLINE', 
                                   spatial_reference=arcpy.SpatialReference(spatref_epsg))
arcpy.AddField_management(path, "ADDRESS", "TEXT", "","")

fields = ['SHAPE@','ADDRESS']
icur=arcpy.da.InsertCursor(os.path.join(folder,shapename),fields)
with open(csvfile,'rb') as f:
    reader = csv.DictReader(f)
    for row in reader:
        try:
            listrow=ast.literal_eval(row["route"])
            listrow1=row["Address"]
            line=arcpy.Polyline(arcpy.Array([arcpy.Point(coords[1], coords[0]) for coords in listrow]))
            icur.insertRow((line,listrow1))
        except:
            e = sys.exc_info()[1]
del icur
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Thanks for your help