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PyQGIS Resources

January 2, 2019 Spatial Galaxy

Here is a short list of resources available when writing Python code in QGIS. If you know of others, please leave a comment. Blogs/Websites In alphabetical order: GIS StackExchange Kartoza Linfiniti Lutra Consulting Nathan Woodrow Nyall Dawson Twitter #pyqgis Documentation Choose the version to match your QGIS install PyQGIS Cookbook QGIS API Example Code Existing plugins can be a great learning tool Code Snippets in the PyQGIS Cookbook Plugins/Tools Script Runner: Run scripts to automate QGIS tasks Plugin Builder: Create a starter plugin that you can customize to complete your own plugin Plugin Reloader: Allows you to reload a plugin from within QGIS pb_tool: Tool to compile and deploy your plugins Books PyQGIS Programmers Guide Geospatial Desktop: GIS Scripting (PDF)

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Oblique Speak in the Technical Realm

It amazes me how people fail to communicate when speaking about technical matters. I’m sure you have heard this refrain: “My computer doesn’t work” or perhaps “Program XYZ blows up”. Ok, in the general sense there is some information being conveyed here. Often times the speaker is not merely providing a fact but asking for help in a very oblique manner. Before you think I’m picking on the poor newcomer, I’m not.

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QGIS Training Opportunities

We’re planning a couple of training classes for March: Introduction to QGIS Extending QGIS with Python Each is a one day class and we plan to run them back to back. If you are local or just want to come to Alaska in March for some spring skiing, northern lights viewing, or to experience the equinox, please hop over to GeoApt and let us know so we can plan accordingly.

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Should MapServer join OSGeo?

The MapServer Technical Steering Committee today approved an RFC that calls for MapServer to join the newly formed Open Source Geospatial Foundation. A poll has been put up on the MapServer site (login required) to collect the responses from the community. So far the vote is unanimously in favor of joining, although the poll has only been open for about an hour. Some thought it interesting that MapServer didn’t join immediately, given it was at the center of the failed MapServer Foundation attempt at the end of last year.

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I Love Linux

$ uptime 20:20:56 up 434 days, 15:31, 2 users, load average: 2.32, 0.89, 0.53

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Importing a DBF containing X-Y Values into QGIS

Suppose you have a DBF (.dbf) file containing X and Y values that you want to import and save as a spatial layer. QGIS doesn’t support direct import of a DBF file as a map layer, however, we can use some command line magic to convert it to a CSV file and then use the Delimited Text plugin to get the job done. Your DBF file should have an id for each record and fields containing X and Y values.

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GIS Data is an Illicit Drug

GIS data is like an illicit drug. You can’t control it. It travels in secret and hides in the dark alleys of your organization. Its effect spreads and enslaves those that use it. In the end it can lead to ruin. Well maybe its not that bad but organizing and managing your GIS data is difficult. If you need to maintain canonical datasets, the spread of “temporary” and/or “working” copies is your enemy.

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QGIS PSC Call for Nominations

The QGIS Project Steering Committee (PSC) has announced a call for nominations to fill three vacant positions: Design Advisor Infrastructure Manager Release Manager Nominations are open until August 24, 2013. For details on the PSC, vacancies, and how to nominate someone, see the [Call for Nominations August 2013] (http://hub.qgis.org/projects/quantum-gis/wiki/Call_for_Nominations_August_2013).

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The Great Divide - User and Developer

a great divide separates the typical open source developer and user. each has differing expectations, assumptions, and priorities. the interaction between developer and user can be helpful, cordial, confrontational, or antagonistic. of course this all stems from being on opposite sides of the fence. the key to a successful relationship is communication and understanding (not exactly a new revelation). unfortunately its not possible for one developer to communicate directly with thousands of users.

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What's New in QGIS Plugins

Here’s a summary of recent additions and updates to plugins in the QGIS repository. FlowMapper (0.1.1) - Generates flow lines between discreet nodes for depicting spatial interaction data (e.g. migration). Query By Example (0.2) - Select features by location. Item Browser (1.6.0) - Browse a multiple selection with auto-zooming to feature and an option to open feature form. Custom Launcher (1.1.0) - Customize your own actions to launch your preferred apps or commands within QGIS.

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Using the QGIS Plugin Builder

The Plugin Builder allows you to quickly create a skeleton Python plugin by generating all that boring boilerplate that every plugin requires. Here is a short video showing how to create, compile, and install a new plugin. For more information, see QGIS Workshop Documentation and the PyQGIS Cookbook.

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Building QGIS on Feisty Fawn

Here is the process I used to quickly build (OK, but it was faster than usual) QGIS HEAD on Feisty Fawn. What’s QGIS HEAD? It’s the current development version that includes the tasty Python bindings that allow you to write both QGIS plugins and stand-alone mapping applications. With apt-get or synaptic, install the following: bison fftw3 fftw3-dev flex g++ libgeos-c1 libgeos-dev libgeos2c2a libpq-dev libpq5 libqt4-core libqt4-dev libqt4-gui libqt4-qt3support libqt4-sql libreadline5-dev libsqlite3-dev libtiff4-dev proj pyqt4-dev-tools python-qt4 python-qt4-dev python-sip4 python-sip4-dev qt4-designer qt4-dev-tools qt4-doc qt4-qtconfig sip4 sqlite3 tcl8.

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QGIS Forum Is Closed---What Do You Think?

The forum (http://forum.qgis.org) has been closed for new registrations and marked read-only. Users have been encouraged to use http://gis.stackexchange.com instead. If you have an thoughts on the closure, good, bad, or otherwise, please comment.

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New Version of the QGIS Script Runner Plugin

The Script Runner plugin allows you to manage and execute a collection of scripts in QGIS to automate tasks and perform custom processing. Version 0.6 of Script Runner has been released and includes these changes: Arguments can be passed to a script using keyword arguments Script output is logged to the Script Runner window Script output can be logged to disk Preferences dialog allows control of output and logging options Exceptions in scripts are displayed without interfering with console/logging output Context menu (right-click) to access script functions Edit script function uses system default editor or one you specify in preferences For a basic introduction to Script Runner see this post: Script Runner: A Plugin to Run Python Scripts in QGIS

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Desktop GIS - A Car With No Wheels?

Is desktop GIS software a rusty old car with no wheels? Bouncing around the blogosphere sometimes leaves you with that impression. All the excitement these days seems to center around mashups, hacks, and mapping in your web browser. It’s definitely cool stuff. A number of folks think this is the future of GIS, even when it comes to doing analysis. Part of this trend stems from a desire to deliver mapping to the masses.

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QGIS MapServer

Marco Hugentobler at the Institute of Cartography, ETH Zurich has announced the QGIS MapServer project. From the website: “QGIS mapserver is a server module for geographic maps. The content of vector and raster datasources (e.g. shapefiles, gml, postgis, wfs, geotiff ) is visualized according to the request parameters. The generated map image is sent back to the client over the internet.“ This project is very much in the early stages, as it requires a specific development version of QGIS.

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Vista and Open Source

And so it begins. Chad has made a plea to Microsoft to help sort out issues with the latest World Wind release and Vista. The new security features are causing problems and I suspect that World Wind won’t be the last project to have to deal with it. So far the QGIS project has yet to get an experience report from anybody using Vista. Who knows what that will bring….

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JUMP Start

This is an experience report–your mileage may vary_ I decided to give JUMP another try today. So I downloaded the latest release (1.2) and unzipped it into a directory. Looking at the JUMP Installation Guide reveals the document is written totally for Windows users. No problem, but I’m using a Mac. Looking in the bin directory there is a shell script named JUMPWorkbench-mac.sh. OK, make that executable and give it a go:

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Running QGIS for Windows on Linux

Why would you want to run the Windows version of QGIS on Linux? Because its there. Actually, it may be a useful way to test the Windows version without firing up the dusty old Win32 box. I did this more out of curiosity than anything else. I installed Crossover Linux (http://www.codeweavers.com/products/cxoffice) on an Ubuntu Dapper box. During the install process you are given the option to install Windows software. Of course QGIS isn’t in the list of supported software, but there is an option to install Unsupported Software.

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QGIS Plugin of the Week: Profile

This week we take a look at a how to plot a terrain profile using the Profile plugin. The plugin can be used with any raster format supported by QGIS. You can can display profiles from up to three rasters at once, allowing you to compare the results. To illustrate, we’ll create a simple profile using a DEM of a 1:63,360 quadrangle in Alaska. Installing the Plugin The Profile plugin is installed like all other Python plugins.

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