Number of digits

[ateucher]

Currently to_json includes 22 digits. The GDAL default is 7.

22 seems excessive to me. Should we reduce it? should it be controllable by an additional argument?

write_geojson methods for sp objects currently allows specification of digits via the precision argument in (default NULL)

[sckott]

Agree to reduce it - I looked over the new GeoJSON spec, and it seems like 6 is a good number, or 7 for this package, not too different.

[ateucher]

Great. How about 7, to be consistent with geojsonio::write_json which uses rgdal::writeOGR (so presumably uses GDAL's default 7)?

[sckott]

7 sounds good.

[github-actions]

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