Apologies if this has been covered elsewhere, but I'm trying to generate a bunch of frames (to animate later with ffmpeg) using QGIS Atlas + NASA FIRMS data. I'm using the date column from the FIRMS data, in YYYY-MM-DD format. QGIS version is 3.10.1

Using this technique from this other post to show cumulative points.

$id <= @atlas_featureid

And here are my Atlas settings before I export them as pngs.

Atlas export options

Unfortunately this exports a separate png for each features from of the data, rather than grouping all the points under a given date and exporting a single image for that date.

What could I try to export all the points for each date?

  • Please add your QGIS version Jan 31 '20 at 14:31

Well the principle of the atlas is to create a single map for each features of your layer, so it's logical to have a single map by features.

In your case I suggest a modification / creation of your data. The point is to create a layer with a "row"/ features with multiples points, aggregated by date.

  1. Dissolve your point layer, see there https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/gdal/vectorgeoprocessing.html?highlight=dissolve#dissolve
  2. Use Dissolve field : ACQ_DATE -> creation of a new layer e.g. fire_dissolve_date
  3. Then add this fire_dissolve_date layer for your atlas.

Like this you will have a series of map, with points of fire for a single date by map.

And let me know your animation if you publish it!

  • This worked like a charm—thank you! Additional note: I was having trouble with the sort order of the output images, but what seemed to fix it was to make sure the dates were sorted in the attributes table—then uncheck the "sort by" box under the Atlas settings.
    – marceline
    Feb 4 '20 at 20:43
  • May be it depends on your date format? It' don't seem logical, i will try to figure out this point. Feb 5 '20 at 6:43

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