Easy and simple programming for symbology automation in Arc GIS

1. MINIPROJECT ON
SYMBOLOGY AUTOMATION
USING ARCPY
Presented by:
Jyoti Dhakal (07)
Archana K.C (09)
Megha Shrestha (27)
Sushmita Timilsina (32)

2. Contents
 Introduction
 Objectives
 Method used
 Core code

3. Introduction
 GIS is a system of collecting, preparing, processing,
analysing, interpreting, evaluating and disseminating
geographical data to information.
 “Python is an easy to learn, powerful language with high-
level data structures and a simple but effective approach to
object-oriented programming. Python’s elegant syntax and
dynamic typing make it an ideal language for scripting in
many areas and on most platforms.”

4. Why python in Arc GIS
 Use scripting to develop, execute, and share geo-
processing workflows
 Improves productivity

5. OBJECTIVE
 To automate the Symbology process in Arc GIS no
matter what type the input is

6. Module used
 arcpy.mapping()
 arcpy.mapping provides ability to automate updating of
map documents components such as layers, layout elements
without the need of opening every single documents.

7. GUI
 Python provides various options for developing graphical
user interfaces (GUIs). We are using Tkinter for our mini
project:
 Tkinter: Tkinter is the Python interface to the Tk GUI
toolkit shipped with Python.

8. Methods used
 mxd=arcpy.mapping.MapDocument(r"Current")
 mxd.save() #saving map document
 arcpy.mapping.ListDataFrames(mxd)
 arcpy.RefreshActiveView()
 arcpy.mapping.ListLayers(mxd, '*', change_view)

9. Contd…
 arcpy.mapping.InsertLayer(change_view, refLayer,
insertLayer, "BEFORE")
 arcpy.Describe()
 arcpy.ApplySymbologyFromLayer_management()

10. CORE CODE
if type == "Polygon":
arcpy.ApplySymbologyFromLayer_management(ins_lyr, r"E:kam
haru4th year 2nd sempythonmini_projectdataZones.lyr")
elif type == "Polyline":
arcpy.ApplySymbologyFromLayer_management(ins_lyr, r"E:kam
haru4th year 2nd sempythonmini_projectdataRoads.lyr")
elif type == "Point":
arcpy.ApplySymbologyFromLayer_management(ins_lyr, r"E:kam
haru4th year 2nd sempythonmini_projectdataSettlements.lyr")

11. APPLICATION
 This program will be highly applicable when we
are doing same process again and again several
time for similar type of data to obtain similar type
of output