ArcPy: Edit vertex without removing true curves
I have a multipart polyline FC that has true curves (Oracle 18c SDE.ST_GEOMETRY).
I want to update the coordinates of the vertices in the lines via ArcPy — without losing the true curves:
import arcpy
connection = "Database Connections\my_conn.sde"
feature_class = connection + "\my_owner.my_fc"
spatial_reference = arcpy.Describe(feature_class).spatialReference
with arcpy.da.Editor(connection) as edit_session:
with arcpy.da.UpdateCursor(feature_class, "SHAPE@") as cursor:
for row in cursor:
geometry = row[0].densify("ANGLE", 10000, 0.174533)
parts = arcpy.Array()
for part in geometry:
points = arcpy.Array()
for point in part:
point.M = geometry.measureOnLine(point)
points.append(point)
parts.append(points)
row[0] = arcpy.Polyline(parts, spatial_reference)
cursor.updateRow(row)The script reconstructs and replaces the geometry of the lines. So, unfortunately, it removes the true curves from the shapes.
Before running script:
After running script:
Idea:
Could ESRI consider giving us a clean way to edit vertices — without removing the true curves from the SHAPE?
- I don't want to densify the curves into straight segments...I want to keep the true curves.
- It would be ideal if there were a clean way to do this; not a workaround like converting to JSON and parsing out the curve info from the JSON text (would be messy/fragile).
For example, a simple method like this would be helpful:
UpdateVertex (shape, partNum, vertexNum, [z, m])
#It wouldn't replace the shape or replace the vertex. It would *update* a coordinate in the vertex.
#So the true curves would remain intact.
