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ArcPy and ArcGIS: Geospatial Analysis with Python

By : Silas Toms

3.9 (11)

ArcPy and ArcGIS: Geospatial Analysis with Python

3.9 (11)

By: Silas Toms

Overview of this book

If you are a GIS student or professional who needs an understanding of how to use ArcPy to reduce repetitive tasks and perform analysis faster, this book is for you. It is also a valuable book for Python programmers who want to understand how to automate geospatial analyses.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Introduction to Python for ArcGIS

1. 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

2. 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

3. 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

4. Complex ArcPy Scripts and Generalizing Functions

Python functions–Avoid repeating code

Summary

5. ArcPy Cursors – Search, Insert, and Update

5. 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

6. Working with ArcPy Geometry Objects

ArcPy geometry object classes

Summary

7. Creating a Script Tool

7. Creating a Script Tool

Adding dynamic parameters to a script

Creating a Script tool

Inspecting the final script

Summary

8. Introduction to ArcPy.Mapping

8. 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

9. 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

10. Advanced Geometry Object Methods

Creating a Python module

Adding advanced analysis components

Summary

11. Network Analyst and Spatial Analyst with ArcPy

11. 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

12. The End of the Beginning

Getting field information from feature classes

Summary

Index

Index

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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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