5. ArcPy Cursors – Search, Insert, and Update | ArcPy and ArcGIS: Geospatial Analysis with Python

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Table Of Contents

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

Inserting a polyline geometry

To create and insert a polyline-type shape field from a series of points, it's best to use the SHAPE@ keyword. We will also further explore the ArcPy Geometry types, which will be discussed in the next chapter. When working with the SHAPE@ keyword, we have to work with data in ESRI's spatial binary formats, and the data must be written back to the field in the same format using the ArcPy Geometry types.

To create a polyline, there is one requirement, at least two valid points made of two coordinate pairs. When working with the SHAPE@ keyword, there is a methodology to converting the coordinate pairs into an ArcPy Point and then adding it to an ArcPy Array, which is then converted into an ArcPy Polyline to be written back to the shape field:

listOfPoints = [(6002672.58675, 2092447.04362),
               (6003672.58675, 2093447.04362),
               (6004672.58675, 2094447.04362)
               ]
line = 'New Bus Line'
lineID = 12345
busLine = r'C:\Projects\PacktDB...

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