The parallels of latitude and the meridians of longitude are all straight lines on the
Mercator projection. That's why Greenland looks bigger than South America.
That's true of the Mercator projection, among others.
Two straight lines that remain equal distance apart are parallel lines.
It will roll around. To make a flat map from a round globe, a projection is used. In making the projection not all measures can be preserved and so distances will be stretched for some areas, and straight lines on the projection will correspond to curved lines on the globe. There are different projections that can be used which try to minimise the effect on different measures.
A polygon.
an intersection
the mercator projection lines are straight but the robinsons are curved
The ability of the Mercator projection to allow straight and constant course lines. Or longitude and latitude lines.
The ability of the Mercator projection to allow straight and constant course lines. Or longitude and latitude lines.
The Mercator projection does that.
cylindrical
That's true of the Mercator projection, among others.
a gps
They go straight up and down in parallel. (This is as opposed to a Robinson Projection where they bow out and away from the Prime Meridian.)
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The Mercator projection has straight meridians and parallels that intersect at right angles. Scale is true at the equator or at two standard parallels equidistant from the equator. The projection is often used for marine navigation because all straight lines on the map are lines of constant azimuth.
The Mercator projection
Mercator projection represents rhumb lines, which are useful for navigation. It makes the areas near the poles appear very large.