A flow line for a map on a vector field is a path such that .
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y=x
by using the position on the sky and the redshift to determine a distance along the line of sight
by using the position on the sky and the redshift to determine a distance along the line of sight
Isobar for atmospheric pressure, isotherm for temperature, or contour for height above (below) sea level.
A line scale is a long line with regularly interval numbers. They are usually used on maps to show distance. They can have different scales (km, cm, in) and compare distances. For example, if you have a map of Canada in a textbook, a line scale in the bottom mights show that every five cm on a page represents 700km on the map.