problem of using arcpy.polyline creat line

Question

I  have a python script that was get coordinate points (Longitudinal and latitudinal coordinate ) from excel and writing them to an arcpy.Array and then writing the array to an already existing feature class as a polyline.  but line created  finished offset the point ,and vertices of  creating line  less than numbers of points.

点生成的线上code.PNG

点生成的线上.PNG

testProxy.zip

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lmzh · Answer

thanks, offset reason is lack of spatial reference indeed.

LukeWebb · Answer

I always make my polylines like this, so no idea if this will help: polyline=arcpy.Polyline(array) row.setValue(shapename, polyline) For the offset, you probably need to include a spatial reference: spatref_epsg = 4326 #https://spatialreference.org/ref/epsg/wgs-84/ arcpy.CreateFeatureclass_management(out_path=folder, out_name=shapename,geometry_type='POLYLINE', spatial_reference=arcpy.SpatialReference(spatref_epsg))

JoshuaBixby · Answer

You appear to be using the original ArcPy cursors, as opposed to the ArcPy Data Access cursors that were introduced in 10.1.  I recommend switching to the DA cursors and then re-post your question if you are still having issues:  Accessing data using cursors—Help | ArcGIS Desktop