Get Building Mapping Applications with QGIS PDF
By Erik Westra
Create your individual refined purposes to research and reveal geospatial details utilizing QGIS and Python
About This Book
- Make use of the geospatial services of QGIS inside of your Python programs
- Build whole standalone mapping purposes in accordance with QGIS and Python
- Use QGIS as a Python geospatial improvement environment
Who This booklet Is For
If you're an skilled Python developer who desires to create your individual geospatial purposes with minimal fuss, this is often the e-book for you. whereas a few familiarity with mapping functions will be a bonus, no earlier wisdom of geospatial suggestions is needed. whether you've got by no means used QGIS sooner than, this booklet will speedy get you as much as speed.
What you are going to Learn
- Use the Python Console to discover and regulate QGIS
- Perform geospatial improvement projects utilizing the PyQGIS Python library
- Create invaluable geospatial purposes applied as QGIS Python plugins
- Use QGIS as a standalone geoprocessing library inside your Python programs
- Build advanced interactive map-based GUIs inside your personal Python programs
- Understand how Python scripting can be utilized to customise the QGIS system
- Utilize the real strength of Python and QGIS to create your personal entire mapping applications
QGIS is likely one of the most appropriate open resource Geographical info structures. whereas constructing Python geospatial purposes will be difficult, QGIS simplifies the method by way of combining the mandatory geoprocessing libraries with a worldly consumer interface, all of which might be without delay managed utilizing Python code.
Starting with an advent to QGIS and the way to exploit the integrated QGIS Python Console, we are going to train you ways to jot down Python code that uses the geospatial functions of QGIS. construction in this, you are going to eventually the right way to create your personal refined standalone mapping functions outfitted on best of QGIS. you are going to the best way to use the Python Console as a window into the QGIS programming atmosphere, after which use that setting to create your personal Python scripts and plugins to customise QGIS. As your wisdom of the PyQGIS library grows, you are going to use it to accomplish numerous real-world geospatial programming projects, culminating within the construction of your personal advanced standalone purposes to load, examine, and reveal geospatial data.
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Extra resources for Building Mapping Applications with QGIS
For example: This application is still a bit ugly—you can see white space at the top and bottom this map because it doesn't take into account the aspect ratio of the map data. There's also no feature of zooming in or scrolling around the map. However, these can be added quite easily, and as you can see, it's not very difficult to create your own standalone mapping applications built on top of QGIS. [ 25 ] Getting Started with QGIS Summary In this chapter, we became familiar with QGIS and the various ways in which it can be used as a Python geospatial development system.
There are some gotchas, however, and we will cover these as they come up. Deciphering the C++ documentation As QGIS is implemented in C++, the documentation for QGIS APIs is all based on C++. This can make it difficult for Python developers to understand and work with the QGIS APIs. For example, the API documentation for the QgsInterface. zoomToActiveLayer() method: [ 48 ] Chapter 3 If you're not familiar with C++, this can be quite confusing. Fortunately, as a Python programmer, you can skip over much of the complexity as it doesn't apply to you.
This defines the contents of the dialog box based on your template. • Your plugin can then display the dialog box as required, extracting the entered values and using the results to interact with QGIS via the iface variable. Plugins are a useful way of extending and customizing QGIS. We will return to the topic of QGIS plugins in Chapter 4, Creating QGIS Plugins, where we will create our own plugin from scratch. Writing an external application The final way to work with Python and QGIS is to write a completely standalone Python program that imports the QGIS libraries and works with them directly.
Building Mapping Applications with QGIS by Erik Westra