QGIS TimeManager Heatmap Tutorial
Download as PPTX, PDF0 likes1,019 views
The document provides instructions for installing plugins, adding a CSV file as a delimited text layer in OpenLayers, configuring the TimeManager plugin to display points from the CSV as a heatmap over time, and exporting the animation as a video. Key steps include: 1. Installing the TimeManager and OpenLayers plugins. 2. Adding the CSV file as a delimited text layer and configuring the longitude, latitude, and coordinate system. 3. Using the TimeManager plugin to animate the CSV points over time based on a date column and export the animation as a sequence of PNG images. 4. Combining the PNG images into an MP4 video using ffmpeg.
QGIS TimeManager Heatmap Tutorial
- 1. Plugins > Manage and Install Plugins Install TimeManager and OpenLayers Plugins
- 2. Web > OpenLayers Plugin > OpenStreetMap > OpenStreetMap
- 3. Sidebar > Click <Add Delimited Text Layer> Button Click Browse and choose CSV file Ensure X is Longitude and Y is Latitude Click OK
- 5. Points from the CSV should show on the map as such
- 6. Use the Zoom tool in the toolbar and drag over a region to zoom
- 7. Choose settings in the TimeManager bar at the bottom of the window Select the CSV layer (not the basemap) Select Start Time as the date(time) column in your CSV
- 8. Specify the Time format with a python time formatting
- 9. If your TimeManager is activated (as shown below, the power icon is enabled in the TimeManager bar), the number of dots shown should be those at the selected time only.
- 10. Right click the CSV layer and select Properties
- 11. Change the style to Heatmap Select a color scheme (OrRd in this case) Select to weigh points by a value, in this case, ‘Brightness’ Select layer blending mode to be Multiply
- 12. You should see a heatmap like this
- 13. Set the time frame size to the interval you want (1 week in this case) Click ‘Export Video’ in the TimeManager bar and select and output folder Click ok
- 14. You will receive a message when done A sequence of png files will be exported to the output folder you chose To combine the png files to a movie, try using ffmpeg On MacOSX with homebrew: brew install Then in the folder: ffmpeg -framerate 10 -i frame%03d.png output.mp4 An mp4 file will be exported with framerate 10