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Mastering Geospatial Development with QGIS 3.x

Mastering Geospatial Development with QGIS 3.x

By : Islam, Miles, Kurt Menke, GISP, Smith Jr., GISP, Pirelli, Van Hoesen, GISP
4 (1)
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Mastering Geospatial Development with QGIS 3.x

Mastering Geospatial Development with QGIS 3.x

4 (1)
By: Islam, Miles, Kurt Menke, GISP, Smith Jr., GISP, Pirelli, Van Hoesen, GISP

Overview of this book

QGIS is an open source solution to GIS and widely used by GIS professionals all over the world. It is the leading alternative to proprietary GIS software. Although QGIS is described as intuitive, it is also, by default, complex. Knowing which tools to use and how to apply them is essential to producing valuable deliverables on time. Starting with a refresher on the QGIS basics and getting you acquainted with the latest QGIS 3.6 updates, this book will take you all the way through to teaching you how to create a spatial database and a GeoPackage. Next, you will learn how to style raster and vector data by choosing and managing different colors. The book will then focus on processing raster and vector data. You will be then taught advanced applications, such as creating and editing vector data. Along with that, you will also learn about the newly updated Processing Toolbox, which will help you develop the advanced data visualizations. The book will then explain to you the graphic modeler, how to create QGIS plugins with PyQGIS, and how to integrate Python analysis scripts with QGIS. By the end of the book, you will understand how to work with all aspects of QGIS and will be ready to use it for any type of GIS work.
Table of Contents (17 chapters)
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1
Section 1: Introduction
3
Section 2: Getting Started
8
Section 3: Diving Deeper
11
Section 4: Becoming a Master

Executing model algorithms iteratively

Models, like all QGIS algorithms, can be executed iteratively. Here, we will create a new QGIS model: DEMs_Clipped_to_Watersheds.model3. We will use two inputs, a DEM covering Taos, New Mexico and a watersheds polygon layer for the area.

The elevation.tif and watersheds.shp sample data will be used:

Input data: watersheds and a DEM

Now create this model with a vector layer input named Watersheds and a raster layer input named DEM. Then, use Clip raster with polygon by typing it in the Processing Toolbox search area. After we open this by double clicking, use DEM for Input field and watersheds for Polygons field and name the Clipped region as Watershed DEM:

The model will now look as follows:

This model uses the Clip raster with polygon tool to clip the DEM to the watersheds...

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