I am struggling to convert a large GeoJSON file that is approximately 1.4GB in size. The command line tool is unable to handle the file due to its filesize. I typically use the topojson command tool like so:
topojson {{ input file }} >> {{ output file }}
Unfortunately, web tools present the same issue, causing the browser to hang.
Any recommendations on the most effective method to convert this massive GeoJSON file?
If you're looking to work with Topojson using the command line, it's important to acquaint yourself with the concise and well-crafted API documentation before diving in.
topojson input.json >> output.json # wondering about the meaning of `>>`?
Consulting the topojson user manual reveals that the recommended practice is to utilize > rather than >>, as the latter signifies "append to the output file." This discrepancy might be causing the issue at hand.
topojson input.json > output.json # transforming geo data into topojson format.
This command maintains the original data quality from the geojson input while resulting in a +250MB topojson file. However, when processed through d3js on the client side, d3.topojson attempts to convert it back to geojson (1.4GB!), leading to the generation of an almost 1GB svg in your browser. Not only is this workflow taxing and potentially crashing, but also redundant: topojson serves the purpose of simplifying gis data for compatibility with web browsers' lower capacities. Considering that HD screens operate within 1980*1280 dimensions, gis data typically surpasses this threshold and hence requires simplification.
The key lies in employing the topojson command line to effectively simplify extensive geojson datasets. One common approach involves utilizing -q 1e4:
topojson -q 1e4 \
-o out.json \
-- input.geojson
This results in an output file with a pseudo-pixel quality equivalent to 10,000 pixels, significantly lower than the input yet adequate for client-side dataviz purposes, all while maintaining a filesize of around or under 1MB.
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