GIS Customization I

Binaural recording + reconstructing performances
Holophonics - Virtual Barber Shop
John Q. Walker: Re-creating great performances

Algonquin ArcGIS Customization Courses
GIS Customization I =
ArcPy (Python Package for ArcGIS)
+ .NET, Visual Studio, C# Essentials
+ Intro to ArcObjects
GIS Customzation II =
ArcGIS .NET templates
+ Extending ArcGIS
+ Add-ins

GIS Customization I Course overview
Before study break
Python & ArcGIS 10 (ArcPy) arcpy.mapping
After study break
Intro to .NET, Visual Studio, & C#
Code modules, functions, strings, file I/O, OOP
Class libraries, console & Windows apps
Intro to ArcObjects

Marking
Quizzes – 4 x 20%
Exercises/participation
50% for working during lab period & providing zip of progress
Submitting “completed” exercises before next class
+25% if not completed but progress was made since lab period
+25% for completing exercises (working code)

Working in pairs, or not
Benefits of working in pairs to you
1 + 1 = 3
One brain working on details (syntax) +
Other brain working on solution and next steps
Ability to work in pairs or groups is an essential attribute for the work force – standard question for reference calls, letters of support, etc
Marks-based pairs (highest with highest, lowest with lowest)
Easier for me/better for you to help/mark 10 pairs vs 20 singles
I am asked to be a reference for students
(even if the student doesn’t ask me)
FYI, I don’t lie.
Send me an e-mail if you want to opt out

References
What would you want someone to say about you?

Why customize ArcGIS? Avoid repetition.
Software does exactly what you want but you don’t want to do it manually dozens or thousands of times.
Example: Clip 30 feature classes with 6 AOI’s
180 times OR < 20 lines of Python code.

Python, ArcGIS, ArcPy, & Geoprocessing
ArcPy is a site-package that builds on
(and is a successor to) the successful 9.3 arcgisscripting module
Provides access to Geoprocessing tools in ArcGIS
Input
Dataset(s)
Custom toolboxes
Output
Dataset(s)

Why customize ArcGIS ? Workflow.
Software does not do EXACTLY what you want to do
“out-of-the-box” but has the programming infrastructure required to allow you to customize it to do exactly what you want

Extending ArcGIS, Add-ins, C#, & ArcObjects
Adding toolbars, buttons, tools, etc.
Python could not do this until ArcGIS 10.1 … Python will never be able to extend ArcGIS like C# and C# may never be able to extend it like C++
GIS Customization II (GIS4307) will cover extending
ArcGIS with C#

Dev options with ArcGIS

Open Source GIS components

GIS Customization Business

esriDC R&D Center

What can you do with customization?

Python at 2014 Dev Summit

Good talk from 2011 …
2 hrs

GIS Customization I starts here …
Brief intro to ArcPy & the Geoprocessing Framework

ArcGIS – Python integration
ArcGIS 8.x – 9.x
ArcGIS 10.x
Python ? – 2.5
Python interpreter/ interactive window
IN ArcGIS
Python 2.6 - ?

ArcGIS 10
Python in ArcGIS 9.x vs 10.x
ArcGIS 9.3

Python Interactive window in ArcGIS
Options to Save As … / Load
Clear All / Clear selected

Python, ArcGIS, ArcPy, & Geoprocessing
ArcPy introduced at ArcGIS 10

ArcPy site-package
A Python package is a folder containing
Python modules, e.g. mapping, ga (Geostatistical Analyst)
& possibly sub-packages, e.g. sa –
(Spatial Analyst)

Quick tour of ArcPy
Geoprocessing tool access arcpy.Clip_analysis(…*) arcpy.Buffer_analysis(…*)
Functions arcpy.ListFeatureClasses() arcpy.Describe(…*)
Classes arcpy.SpatialReference(prjFile) arcpy.Point({X},{Y},{Z},{M},{ID})
Modules & Packages arcpy.mapping
arcpy.sa
* “…” used instead multiple parameters

Tools vs Functions
CaSe SeNsiTive in ArcGIS 10
Tools
Documentation
Functions
Tool documentation ArcPy documentation
Returns
Messaging
Availability result object Lists, numbers, etc.
Tools produce messages … arcpy.GetMessages()
Availability depends on licensing (ArcView,
ArcEditor, ArcInfo)
No messaging
Availability does not depend on license level

result returned from a Tool

Environment settings in ArcGIS 10 / ArcPy
Environment settings affect analysis performed by tools
(workspace, extent, cell size, etc.)

Environment settings in Python using ArcPy import arcpy from arcpy import env
# Print the passed-down current workspace environment setting
# arcpy.AddMessage("The passed-down current workspace is: %s" % env.workspace)
# Set a new workspace, overriding the passed-down workspace
# env.workspace = "e:/data/script.gdb" arcpy.AddMessage("The new current workspace is: %s" % env.workspace)

Done