Programming ArcGIS with Python Cookbook, Second Edition

Programming ArcGIS with Python Cookbook, Second Edition

By : Eric Pimpler

Buy this Book

Programming ArcGIS with Python Cookbook, Second Edition

By: Eric Pimpler

Buy this Book

Overview of this book

The book kicks off with the fundamentals of starting to use Python with ArcGIS, followed by recipes on managing map documents and layers, including how to find and fix broken data links in these files. In the second part of the book, you will learn to create custom geoprocessing tools and how to use the Attribute and Location tools to select specific features. The third part of the book covers topics for advanced users including the REST API, and also teaches you how to use Python with ArcGIS Pro. The book finishes with appendices covering how to automate Python scripts, and the five things that should be at the back of every GIS programmer's mind.

Programming ArcGIS with Python Cookbook Second Edition

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Fundamentals of the Python Language for ArcGIS

Using IDLE for Python script development

Using the ArcGIS Python window

Python language fundamentals

Summary

Managing Map Documents and Layers

Introduction

Referencing the current map document

Referencing map documents on a disk

Getting a list of layers in a map document

Restricting the list of layers

Zooming in to selected features

Changing the map extent

Adding layers to a map document

Inserting layers into a map document

Updating layer symbology

Updating layer properties

Working with time-enabled layers in a data frame

Finding and Fixing Broken Data Links

Introduction

Finding broken data sources in your map document and layer files

Fixing broken data sources with MapDocument.findAndReplaceWorkspacePaths()

Fixing broken data sources with MapDocument.replaceWorkspaces()

Fixing individual layer and table objects with replaceDataSource()

Finding broken data sources in all map documents in a folder

Automating Map Production and Printing

Introduction

Creating a list of layout elements

Assigning a unique name to layout elements

Restricting the layout elements returned by ListLayoutElements()

Updating the properties of layout elements

Getting a list of available printers

Printing maps with PrintMap()

Exporting a map to a PDF file

Exporting a map to an image file

Exporting a report

Building a map book with Data Driven Pages and ArcPy mapping

Publishing a map document to an ArcGIS Server service

Executing Geoprocessing Tools from Scripts

Introduction

Finding geoprocessing tools

Retrieving a toolbox alias

Executing geoprocessing tools from a script

Using the output of a tool as an input to another tool

Creating Custom Geoprocessing Tools

Introduction

Creating a custom geoprocessing tool

Creating a Python toolbox

Querying and Selecting Data

Introduction

Constructing a proper attribute query syntax

Creating feature layers and table views

Selecting features and rows with the Select Layer by Attribute tool

Selecting features with the Select by Location tool

Combining a spatial and attribute query with the Select by Location tool

Using the ArcPy Data Access Module with Feature Classes and Tables

Introduction

Retrieving features from a feature class with SearchCursor

Filtering records with a where clause

Improving cursor performance with geometry tokens

Inserting rows with InsertCursor

Updating rows with UpdateCursor

Deleting rows with UpdateCursor

Inserting and updating rows inside an edit session

Reading geometry from a feature class

Using Walk() to navigate directories

Listing and Describing GIS Data

Introduction

Working with the ArcPy list functions

Getting a list of fields in a feature class or table

Using the Describe() function to return descriptive information about a feature class

Using the Describe() function to return descriptive information about a raster image

Customizing the ArcGIS Interface with Add-ins

Introduction

Downloading and installing the Python Add-in Wizard

Creating a button add-in and using the Python add-ins module

Installing and testing an add-in

Creating a tool add-in

Error Handling and Troubleshooting

Introduction

Exploring the default Python error message

Adding Python exception handling structures (try/except/else)

Retrieving tool messages with GetMessages()

Filtering tool messages by the level of severity

Testing for and responding to specific error messages

Using Python for Advanced ArcGIS

Introduction

Getting started with the ArcGIS REST API

Making HTTP requests and parsing the response with Python

Getting layer information with the ArcGIS REST API and Python

Exporting a map with the ArcGIS REST API and Python

Querying a map service with the ArcGIS REST API and Python

Geocoding with the Esri World Geocoding Service

Using FieldMap and FieldMappings

Using a ValueTable to provide multivalue input to a tool

Using Python with ArcGIS Pro

Introduction

Using the new Python window in ArcGIS Pro

Coding differences between ArcGIS for Desktop and ArcGIS Pro

Installing Python for ArcGIS Pro

Converting ArcGIS for Desktop Python code to ArcGIS Pro

Automating Python Scripts

Introduction

Running Python scripts from the command line

Using sys.argv[ ] to capture command-line input

Adding Python scripts to batch files

Scheduling batch files to run at prescribed times

Five Python Recipes Every GIS Programmer Should Know

Introduction

Reading data from a delimited text file

Sending e-mails

Retrieving files from an FTP server

Creating ZIP files

Reading XML files

Index

Customer Reviews

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Creating a tool add-in

Tool add-ins are similar to buttons with the exception that tools require some type of interaction with the map. The zoom-in tool, for example, is a type of tool. Tools should be placed inside a toolbar or tool palette. The properties similar to those of a button. You'll also need to edit the Python script.

Getting ready

The Tool class has a number of properties, including cursor, enabled, and shape. The cursor property sets the cursor for the tool when it is clicked on, and is defined as an integer value corresponding to the cursor types, as follows:

By default, tools are enabled. This can be changed, though, by setting the enabled property to false. Finally, the shape property specifies the type of shape to be drawn and it can be a line, rectangle, or circle. These properties are typically set inside the constructor of the tool, which is defined by the __init__ method, as shown in the following code example. The self object refers to the current object (a tool in this...

Programming ArcGIS with Python Cookbook, Second Edition

By : Eric Pimpler

Programming ArcGIS with Python Cookbook, Second Edition

By: Eric Pimpler

Overview of this book

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Programming ArcGIS with Python Cookbook, Second Edition

Creating a tool add-in

Getting ready