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ArcPy and ArcGIS: Geospatial Analysis with Python

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ArcPy and ArcGIS: Geospatial Analysis with Python

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ArcPy and ArcGIS: Geospatial Analysis with Python
Feb, 2015 | 224 pages
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Table of Contents (19 chapters)
ArcPy and ArcGIS – Geospatial Analysis with Python
ArcPy and ArcGIS – Geospatial Analysis with Python
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introduction to Python for ArcGIS
Introduction to Python for ArcGIS
Overview of Python
Python as a programming language
Important Python Modules for GIS Analysis
Summary
2
Configuring the Python Environment
Configuring the Python Environment
What is a Python script?
What is the Python interpreter?
Make Python scripts executable when clicked on
Integrated Development Environments (IDEs)
Python folder structure
The sys.path.append() method
Summary
3
Creating the First Python Script
Creating the First Python Script
Prerequisites
Creating a model and exporting to Python
Exporting the model and adjusting the script
File paths in Python
Continuing the script analysis: the ArcPy tools
Adjusting the Script
Adding the CSV module to the script
The final script
Summary
4
Complex ArcPy Scripts and Generalizing Functions
Complex ArcPy Scripts and Generalizing Functions
Python functions–Avoid repeating code
Summary
5
ArcPy Cursors – Search, Insert, and Update
ArcPy Cursors – Search, Insert, and Update
The data access module
Inserting a polyline geometry
Inserting a polygon geometry
Summary
6
Working with ArcPy Geometry Objects
Working with ArcPy Geometry Objects
ArcPy geometry object classes
Summary
7
Creating a Script Tool
Creating a Script Tool
Adding dynamic parameters to a script
Creating a Script tool
Inspecting the final script
Summary
8
Introduction to ArcPy.Mapping
Introduction to ArcPy.Mapping
Using ArcPy with map documents
Inspecting and replacing layer sources
Automated map document adjustment
Running the script in the Python Window
Summary
9
More ArcPy.Mapping Techniques
More ArcPy.Mapping Techniques
Using arcpy.mapping to control Layer objects
Definition queries
Controlling the data frame window extent and scale
Summary
10
Advanced Geometry Object Methods
Advanced Geometry Object Methods
Creating a Python module
Adding advanced analysis components
Summary
11
Network Analyst and Spatial Analyst with ArcPy
Network Analyst and Spatial Analyst with ArcPy
The Network Analyst extension
Using Network Analyst
The Network Analyst module
Accessing the Spatial Analyst Extension
The final result
Summary
12
The End of the Beginning
The End of the Beginning
Getting field information from feature classes
Summary
Index
Index

Exporting the model and adjusting the script

While modeling analysis in ModelBuilder has its drawbacks, there is one fantastic option built into ModelBuilder; the ability to create a model and then export the model to Python. Along with the ArcGIS help documentation, it is the best way to discover the correct Python syntax to use when writing ArcPy scripts.

Create a folder that can hold the exported scripts next to the SanFrancisco geodatabase (for example, C:\Projects\Scripts). This will hold both the exported scripts that ArcGIS automatically generates, and the versions that we will build from those generated scripts.

Open the model called Chapter3Model1 and click on the Model menu in the upper left. Select Export from the menu, and then select To Python Script. Save the script in the script folder as Chapter3Model1.py.

Note

Note that there is also the option to export the model as a graphic. Creating a graphic of the model is a good way to share what the model is doing with other analysts...

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