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From the ogr2ogr docs, use the -nln name option to assign an alternate name to the new layer.


2

Standard OSM tiles are in Spherical Mercator (SRID=3857) so it will probably be easiest to build your grid using the same projection. If you use SM, you might store the data at the highest zoom level OSM supports, or at the highest level zoom level you'll permit users to zoom into. If coverage is sparse, use a data structure along the lines of XIndex, ...


1

The value stored in a cell from a heatmap is often normalized by its area. In this case I would rather suggest an equal area projection so that you can easily aggregate to larger scale



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