>Answering myself, the following seems to work:
>CREATE TABLE "contours" (gid serial PRIMARY KEY, height double precision);
>SELECT AddGeometryColumn('', 'contours', 'way', '27700', 'LINESTRING', 2);
Yes that should work, or just
CREATE TABLE "contours" (gid serial PRIMARY KEY, height int, way GEOMETRY);
TBH there's no need for it to be double or even float. It could just be an int,
same goes for the C++ program as the heights are always integers.
Nick
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