Great-circle distance
The shortest distance between two points along the surface of a sphere or ellipsoid. Applies/refers to the shortest distance between two cities or towns (using the city/municipal center coordinates as points).
Population growth rate
The rate at which the population increases within a given time or period. Applies/refers to the calculated growth rates between each census.
Primary Road
National Road classification, a road that connects major cities with population of at least 100,000.
Secondary Road
National Road classification, a road which complements the national primary roads to provide access to main population and production centers of the country.
Tertiary Road
National Road classification, an existing road under the DPWH which performs a local function.
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