Author: Pygmalion
Map-matched GPX tracks with QMapShack (video tutorial)
Map matching is the process of matching a series of geographic coordinates to a road network. This video explains how to draw map-matched GPX tracks in QMapShack.... Read More
Google TV with a portable monitor and a Chromecast (video tutorial)
In this short video tutorial we’ll show you how to assemble a Google TV from an ARZOPA 15.6 inch monitor and a Chromecast. You’ll also need a couple of USB-C cables, a Mini HDMI to HDMI (f... Read More
Fix ‘Route relation contains too much data’ in routino
When trying to create routino 3.3.3 databases from larger protobuf files in QMapShack we run into the error message ‘Route relation contains too much data’. This can be solved as follows. ... Read More
Android GPX Player
GPX Player is a tool for Android developers that you can use to play GPX tracks on your desktop computer to mock track points on an Android device. Record a GPX or create it with your favorite GIS too... Read More
A Quick Refresher on Logarithms
Logarithm If we write \[x^2 = 121\] it is obvious that we find \(x\) by taking the square root of 121, but what if the exponent is unknown? \[2^x = 8\] The unknown value of the exponent is called the ... Read More
Georeferencing in QMapShack with QMapTool (video tutorial)
Georeferencing means that the internal coordinate system of a raster image, like a digital map or aerial photo, can be related to a ground system of geographic coordinates. Thus, we can make it appear... Read More
Cartesian Coordinates with matplotlib
In this post we’ll create an orthonormal Cartesian plane with x axis, y axis and origin, using matplotlib. If you’re using jupyter first include this line to get inline charts: %matplotlib... Read More
Send a Parcelable to another App on Android
To send a parcelable to another application for it to be deserialized it is essential that: the class definitions of the class to be serialized are identical in both apps, the packages of the classes ... Read More
OpenTopoMap Viewer for Android
OpenTopoMap renders topographic maps from OSM and SRTM data. The style is based on German government maps, with a focus on landmarks and contrasting map colors. This new FOSS Android viewer uses osmdr... Read More
A Vertical Slider in HTML/JS/CSS
A while ago my colleagues and I needed a slider control on a web dashboard. A team of students was assigned to build the entire UI, but they did not quite succeed. A third party front-end developer ev... Read More