Geographic market
Market Coverage Analysis for Türkiye
Enter your centres and radii; the tool works out how much of each province's area falls inside the circles and puts the result on a map. It covers Türkiye only.
How it works
Choose up to four centres and enter up to three radii in kilometres. A centre can be picked from the list of provinces and districts or typed in as coordinates, and every radius applies to every centre. The calculation runs in your browser; the locations you enter are never sent anywhere.
Methodology
Each province boundary is clipped against the circles and the resulting pieces are separated so that they do not overlap, so the ground where two circles meet is not counted twice. Areas are measured on WGS84 and radii are geodesic distances; a circle drawn on a flat projection would come out too wide from east to west, because at Turkish latitudes a degree of longitude is about 86 km against 111 km for a degree of latitude. The measure is area: a province's population or turnover plays no part in it.
Frequently asked questions
Is coverage measured by population or by area?
By area. Covering half of a province's land area is not the same as reaching half of its people; population is not spread evenly within a province.
Is the radius a straight-line distance?
Yes. The circles use geodesic distance across the surface of the earth; road distance and travel time play no part.
Does the result define the relevant geographic market?
No. The relevant geographic market turns on demand and supply substitution, transport costs and customer behaviour. This tool only measures how much ground a given distance covers.
Where does the data come from?
Province boundaries come from the geoBoundaries gbOpen TUR ADM1 dataset (CC BY 4.0). The areas are taken from the full-resolution boundary; the geometry drawn on the map and used for the clipping is a simplified version of it.