A cross-border cooperation programme funds joint transport and planning in metropolitan areas that spill across a national border. Its first call for proposals needs an eligibility list drawn from data, not from applicants' claims. The programme office has the urban-footprint layer and the country polygons and one rule: a footprint qualifies when at least one square kilometre of it lies in each of two or more countries — a sliver where a generalised coastline nicks a neighbour does not count.
Return the urban areas with at least 1 km² of footprint inside each of two or more countries, as polygons, carrying:
urban_id — the footprintn_countries — how many countries hold at least 1 km² of itcountries — their iso_a3 codes, joined with ; in alphabetical orderOverlay the footprints on the countries, measure each piece in an equal-area projection, and keep a footprint when two or more of its pieces are at least 1 km². Return the whole footprint polygon, not the pieces, in EPSG:4326.
These are where the teaching is. Read them twice.
Eligibility by overlap with a minimum area is how cross-border, coastal-zone and protected-area programmes turn a policy sentence into a list.
5 scored, 0 informational
How many footprints qualify
36%Carries urban_id, n_countries and countries
18%Total footprint area of the qualifying set
27%Result is polygons
9%Submitted in EPSG:4326
9%