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Publishing digital elevation in Cesium

Posted by: Admire Nyakudya | in GeoServer | 5 months ago | Comments

Digital elevation data is now readily available from multiple sources. There are several tools that can help to visualise elevation data, Cesium being one. Recently I have been researching how to visualise terrain data in cesium and I could not see a  complete example that I could replicate on my own. This post will highlight the steps I took to visualise elevation data in cesium.

QGIS Road to Nerdvana Episode 7: Logging Postgres Calls

Posted by: Seabilwe Tilodi | in PostGIS, QGIS | 5 months ago | Comments

In this episode, Tim Sutton will show you how to enable PostgreSQL logging and what underlying queries are generated by QGIS or any other PostgreSQL client.

QGIS Road to Nerdvana Episode 6 - Responding to feedback on Episode 5 Pull Request

Posted by: Seabilwe Tilodi | in QGIS | 5 months ago | Comments

This episode is a follow-up from Episode  5, responding to the feedback received.
Enjoy Episode 6 of our Road to Nerdvana!!

Mocking Requests with requests_mock

Posted by: Zulfikar Akbar Muzakki | in Python | 5 months ago | Comments

Testing is an important part of software development, be it manual or automated. Untested code is a ticking time bomb ready to explode at the worst time possible, hence each developer must be responsible for testing their code. It’s even better when they make automated tests for their code, even if it’s only unit tests.

QGIS Road to Nerdvana Episode 5: Tweaking the first run dialog

Posted by: Seabilwe Tilodi | in QGIS | 5 months, 2 weeks ago | Comments

In this episode, Tim Sutton takes you along for the ride as he picks a long-time irritation in QGIS: The first run dialog. He tweaks it to make it look nice to submit it as a pull request to QGIS.

QGIS Road to Nerdvana Episode 4: Dealing with Issues

Posted by: Seabilwe Tilodi | in QGIS | 5 months, 2 weeks ago | Comments

In this episode of QGIS road to Nerdvana, Tim Sutton will be showing you a workflow that will aid in dealing with issues encountered with a QGIS that compiles, so you won’t have to compile or debug.

QGIS Road to Nerdvana Episode 3: QGIS QA using astyle and pre-commit hooks

Posted by: Seabilwe Tilodi | in QGIS | 5 months, 3 weeks ago | Comments

We are back with another episode of our roads to Nerdvana. On today’s episode Tim Sutton and world-renowned QGIS developer Matthias Kuhn walk you through the setup process for using 'astyle precommit hooks' - basically clever tools that will make sure your code looks smart and neat automatically so that nobody rejects it for not being standard compliant when you make a pull request.

QGIS Road to Nerdvana Episode 2: QGIS QtCreator Build on Pop_OS! 20.04

Posted by: Seabilwe Tilodi | in QGIS | 5 months, 3 weeks ago | Comments

In today’s video blog, Tim Sutton shows you how to use QtCreator to build QGIS in a graphical development environment. The key entries used when setting up 3D support and here are the commands used to install QtCreator:

QGIS Road to Nerdvana Episode 1: QGIS Console Build

Posted by: Seabilwe Tilodi | in QGIS | 6 months, 1 week ago | Comments

QGIS Road to Nerdvana is an exciting series of videos blogs that walk you through building QGIS environments to installing and using QTCreator all running on Ubuntu 20.04.

Calculating area of rasters in QGIS

Posted by: Admire Nyakudya | 6 months, 4 weeks ago | Comments

QGIS raster functionality has come a long way and continues to improve. During my spare time, I am always on the lookout for interesting questions posed on https://gis.stackexchange.com.

Speeding up multiple web map service requests using Python's asyncio and aiohttp

Posted by: Andre Theron | in Python | 8 months, 2 weeks ago | Comments

Geocontext is a Django app that retrieves information from multiple web based services for a specific query point. The services are arranged into hierarchies with multiple services in a group and multiple groups in a collection. It currently supports querying WMS, WFS & ArcREST services.

School GIS task: create a 5km COVID-19 lockdown exercise buffer around your house

Posted by: Gavin Fleming | in Education, QGIS | 9 months, 3 weeks ago | Comments

If you are doing some teaching in the classroom and some online and you are finding "blended teaching" overwhelming, this task is designed for asynchronous self study.

Does hosting your own server still make sense in 2020?

Posted by: Tim Sutton | 9 months, 4 weeks ago | Comments

Client: We need a server for this project, and we want to host it in house

Consuming cloud optimised GeoTIFFs in QGIS Server

Posted by: Admire Nyakudya | in QGIS | 11 months, 1 week ago | Comments

QGIS has been able to consume cloud optimised GeoTIFFs (COGs) since v3.2, through the data source manager.  This article does not aim to explain what a COG is as various other articles have done so extensively.

Create a custom reference grid in qgis composer part 2

Posted by: Admire Nyakudya | in QGIS | 1 year ago | Comments

This is a follow-up post on https://kartoza.com/en/blog/create-a-custom-reference-grid-in-qgis-composer/.

Data defined settings for grid placements in QGIS 3.12

Posted by: Admire Nyakudya | 1 year, 1 month ago | Comments

For a while now I have been trying to simulate the 1in50k topographic maps of South Africa. I started using QGIS since version 1.8 and I couldn't replicate the cartography on the topographic maps but over time as QGIS has matured, I could replicate the NGI maps. NGI uses proprietary software and then Adobe to fine-tune some context on the maps. For this exercise I used QGIS 3.12.0

Calculating intersects for map layers and map extent dynamically in QGIS

Posted by: Admire Nyakudya | in Python, QGIS | 1 year, 1 month ago | Comments

Recently we have been working on a project that involves simulating the 1 in 50k topographic maps in South Africa. Since we are using QGIS Server to print the map all the logic is set up in print composer. All  maps generated are dynamic (users can select a specific area within South Africa to print) and QGIS Server will use the map template to generate the map. 

The Longest River in the World

Posted by: Andre Kruger | in QGIS | 1 year, 5 months ago | Comments

Every now and then there might be a dispute about which is really the longest river in the world. As is shown in this National Geographic article. Even Wikipedia indicates that the fact that the Nile river is accepted as the longest river in the world as "disputed".

FOSS4G 2019 and QGIS in Bucharest

Posted by: Gavin Fleming | in Conference, FOSSGIS, GRASS GIS, GeoNode, GeoServer, Leaflet, PostGIS, Python, QGIS | 1 year, 6 months ago | Comments

Open source GIS is alive and well and continues to grow in leaps and bounds around the world. Why so many Government entities in South Africa continue paying a fortune of tax-payers money for privative GIS and database software beats me, when wealthy, developed countries (as in most of Europe, for example) saw the light years ago and enthusiastically embrace FOSS.

Batch count vector features intersecting series of blocks in PostgreSQL

Posted by: Admire Nyakudya | in Database | 1 year, 10 months ago | Comments

The national mapping agency in South Africa (NGI ) caters for national mapping, digital topographic and other Geo-Spatial Information services. The department is mandated to provide spatial data for the whole country. In most cases, they have an in-house team that is responsible for digitizing aerial photography, field validation to produce vector data that is used to make 1:50 000 topographic maps.

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