#### Overview of this book

Geospatial Analysis is used in almost every field you can think of from medicine, to defense, to farming. This book will guide you gently into this exciting and complex field. It walks you through the building blocks of geospatial analysis and how to apply them to influence decision making using the latest Python software. Learning Geospatial Analysis with Python, 2nd Edition uses the expressive and powerful Python 3 programming language to guide you through geographic information systems, remote sensing, topography, and more, while providing a framework for you to approach geospatial analysis effectively, but on your own terms. We start by giving you a little background on the field, and a survey of the techniques and technology used. We then split the field into its component specialty areas: GIS, remote sensing, elevation data, advanced modeling, and real-time data. This book will teach you everything you need to know about, Geospatial Analysis from using a particular software package or API to using generic algorithms that can be applied. This book focuses on pure Python whenever possible to minimize compiling platform-dependent binaries, so that you don’t become bogged down in just getting ready to do analysis. This book will round out your technical library through handy recipes that will give you a good understanding of a field that supplements many a modern day human endeavors.
Learning Geospatial Analysis with Python Second Edition
Credits
www.PacktPub.com
Preface
Free Chapter
Learning Geospatial Analysis with Python
Geospatial Data
The Geospatial Technology Landscape
Geospatial Python Toolbox
Python and Geographic Information Systems
Python and Remote Sensing
Python and Elevation Data
Real-Time Data
Putting It All Together
Index

## Measuring the distance

In order to understand the elevation data chart, we need reference points along the x axis to help us determine the elevation along the route. We will calculate the mile splits along the route and place these at the appropriate location on the x axis of our charts:

```# Locate the mile markers
for i in range(1, int(round(total))):
mile = 0
while mile < i:
j += 1
mile += distances[j]
measurements.append((int(mile), j))
j =- 1

# Set up labels for the mile points

positions = []
miles = []
for m, i in measurements:
pos = ((i*1.0)/len(elvs)) * 100
positions.append(pos)
miles.append(m)

# Position the mile marker labels along the x axis
miles_label = chart.set_axis_labels(Axis.BOTTOM, miles)
chart.set_axis_positions(miles_label, positions)

# Label the x axis as "Miles"
miles_text = chart.set_axis_labels(Axis.BOTTOM, ["MILES", ])
chart.set_axis_positions(miles_text, [50, ])

# Save the chart