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Geolens

Realm

Skills

Connect maps with the world

Build confidence with contours, coordinates and projections by comparing each map with the terrain or globe it represents.

Ordnance Survey 1:250,000 map sheet NO of northeast Scotland with the British National Grid.
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Ordnance Survey sheet NO, northeast Scotland. Eastings and northings locate places in the British National Grid. This reduced 1:250,000 sheet illustrates the grid; use a detailed map for precise six-figure references.
USGS topographic map of Mount Rainier with contours, glaciers and named summits.
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Skills

Contours ↔ 3D terrain

A contour joins places at the same elevation.

A physical marker of the historic Greenwich Meridian at the Royal Observatory.
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Skills

Graticule and coordinates

Latitude measures an angle north or south of the equator, while longitude measures an angle east or west of the prime meridian.

NASA Blue Marble satellite composite of Earth in an equirectangular global map.
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Skills

Map projections

A map projection transfers positions from a curved surface to a plane.

USGS topographic map extract showing Yosemite Creek, a campground, contours and coordinate markings.
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Skills

Grid references

A grid reference locates a cell using eastings followed by northings.