Programming,ArcGIS 10.1 with,Python Cookbook电子书

Programming ArcGIS 10.1 with Python Cookbook

Table of Contents

Programming ArcGIS 10.1 with Python Cookbook

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers and more

Why Subscribe?

Free Access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Fundamentals of the Python Language for ArcGIS

Using IDLE for Python script development

The Python shell window

The Python script window

Editing existing Python scripts

Executing scripts from IDLE

Python language fundamentals

Commenting code

Importing modules

Variables

Built-in datatypes

Strings

String manipulation

Numbers

Lists

Tuples

Dictionaries

Classes and objects

Statements

Decision support statements

Looping statements

Try statements

with statements

File I/O

Summary

2. Writing Basic Geoprocessing Scripts with ArcPy

Introduction

Using the ArcGIS Python window

Getting ready

How to do it…

Accessing ArcPy with Python

Getting ready

How to do it…

How it works…

Executing tools from a script

How to do it…

How it works…

There's more…

Using ArcGIS Desktop help

Getting ready

How to do it...

How it works...

Using variables to store data

Getting ready

How to do it...

How it works...

Accessing ArcPy modules with Python

Getting ready

How to do it…

How it works…

3. Managing Map Documents and Layers

Introduction

Referencing the current map document

Getting ready

How to do it…

How it works

Referencing map documents on a disk

Getting ready

How to do it…

How it works…

Accessing a data frame

Getting ready

How to do it...

How it works...

Getting a list of layers in a map document

Getting ready

How to do it…

How it works…

There's more…

Restricting the list of layers

Getting ready

How to do it…

How it works…

Changing the map extent

Getting ready

How to do it...

How it works...

Getting a list of tables

Getting ready

How to do it…

How it works…

Adding layers to a map document

Getting ready

How to do it…

How it works…

There's more…

Inserting layers into a map document

Getting ready

How to do it…

How it works…

There's more…

Updating layer symbology

Getting ready

How to do it…

How it works…

There's more...

Updating layer properties

Getting ready

How to do it…

4. Finding and Fixing Broken Data Links

Introduction

Finding broken data sources in your map document and layer files

Getting ready

How to do it…

How it works…

There's more…

Fixing broken data sources with MapDocument.findAndReplaceWorkspacePaths()

Getting ready

How to do it…

How it works…

There's more…

Fixing broken data sources with MapDocument.replaceWorkspaces()

Getting ready

How to do it…

How it works…

Fixing individual Layer and Table objects with replaceDataSource()

Getting ready

How to do it…

How it works…

There's more…

Finding all broken data sources in all map documents in a folder

Getting ready

How to do it...

How it works...

5. Automating Map Production and Printing

Introduction

Creating a list of layout elements

Getting ready...

How to do it…

How it works…

Assigning a unique name to layout elements

Getting ready

How to do it…

How it works…

There's more…

Restricting the layout elements returned by ListLayoutElements()

Getting ready

How to do it…

How it works...

Updating layout element properties

Getting ready

How to do it…

How it works...

Getting a list of available printers

Getting ready

How to do it…

How it works...

Printing maps with PrintMap()

Getting ready

How to do it…

How it works...

Exporting a map to a PDF file

Getting ready

How to do it…

How it works…

Exporting a map to an image file

Getting ready

How to do it…

How it works…

Creating a map book with PDFDocumentCreate() and PDFDocumentOpen()

Getting ready

How to do it…

How it works...

There's more…

6. Executing Geoprocessing Tools from Scripts

Introduction

Finding geoprocessing tools

Getting ready

How to do it…

How it works…

Retrieving a toolbox alias

Getting ready

How to do it…

How it works…

Executing geoprocessing tools from a script

Getting ready

How to do it…

How it works…

There's more...

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

Getting ready

How to do it...

How it works...

Setting environment variables and examining tool messages

Getting ready

How to do it…

How it works…

7. Creating Custom Geoprocessing Tools

Introduction

Creating a custom geoprocessing tool

Getting ready

How to do it…

How it works…

There's more...

8. Querying and Selecting Data

Introduction

Constructing proper attribute query syntax

Getting ready

How to do it…

How it works…

Creating feature layers and table views

Getting ready

How to do it…

How it works...

There's more...

Selecting features and rows with the Select Layer by Attribute tool

Getting ready

How to do it…

How it works…

Selecting features with the Select by Location tool

Getting ready

How to do it…

How it works…

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

Getting ready

How to do it...

How it works...

9. Using the ArcPy Data Access Module to Select, Insert, and Update Geographic Data and Tables

Introduction

Retrieving features from a feature class with a SearchCursor

Getting ready

How to do it…

How it works…

Filtering records with a where clause

Getting ready

How to do it…

How it works…

Improving cursor performance with geometry tokens

Getting ready

How to do it…

How it works…

Inserting rows with InsertCursor

Getting ready

How to do it…

How it works…

Updating rows with an UpdateCursor

Getting ready

How to do it…

How it works…

Deleting rows with an UpdateCursor

Getting ready

How to do it…

How it works…

Inserting and updating rows inside an edit session

Getting ready

How to do it…

How it works…

Reading geometry from a feature class

Getting ready

How to do it…

How it works…

10. Listing and Describing GIS Data

Introduction

Getting a list of feature classes in a workspace

Getting ready

How to do it…

How it works…

There's more…

Restricting the list of feature classes returned with a wildcard

Getting ready

How to do it…

How it works…

Restricting the list of feature classes returned with a feature type.

Getting ready

How to do it…

How it works…

There's more...

Getting a list of fields in a feature class or table

Getting ready

How to do it…

How it works…

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

Getting ready

How to do it…

How it works…

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

Getting ready

How to do it…

How it works…

Returning workspace information with the Describe() function

Getting ready

How to do it…

How it works…

11. Customizing the ArcGIS Interface with Add-Ins

Introduction

Downloading and installing the Python Add-In wizard

Getting ready

How to do it…

How it works…

Creating a button add-in

Getting ready

How to do it...

How it works...

Installing and testing an add-in

Getting ready

How to do it…

How it works…

Creating a tool add-in

Getting ready

How to do it...

How it works...

There's more…

12. Error Handling and Troubleshooting

Introduction

Exploring the default Python error message

Getting ready

How to do it…

How it works…

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

Getting ready

How to do it…

How it works…

There's more…

Retrieving tool messages with GetMessages()

Getting ready

How to do it…

How it works…

Filtering tool messages by severity level

Getting ready

How to do it…

How it works…

Testing for and responding to specific error messages

Getting ready…

How to do it…

How it works…

Returning individual messages with GetMessage()

Getting ready

How to do it...

How it works...

A. Automating Python Scripts

Introduction

Running Python scripts from the command line

Getting ready

How to do it…

How it works…

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

Getting ready

How to do it...

How it works...

Adding Python scripts to batch files

Getting ready

How to do it...

How it works...

There's more...

Scheduling batch files to run at prescribed times

Getting ready

How to do it...

How it works...

B. Five Things Every GIS Programmer Should Know How to Do with Python

Introduction

Reading data from a delimited text file

Getting ready

How to do it…

How it works…

There's more...

Sending e-mails

Getting ready

How to do it…

How it works…

Retrieving files from an FTP server

Getting ready

How to do it…

How it works…

There's more…

Creating ZIP files

Getting ready

How to do it…

How it works…

There's more…

Reading XML files

Getting ready

How to do it…

How it works…

There's more…

Index