In map terminology, what are the typical dimensions of a sector as used in the source material?

In map terminology, what are the typical dimensions of a sector as used in the source material?

• A. 2.5' by 2.5'
• B. 1° by 1°
• C. 5' by 5'
• D. 10' by 10'

Answer: (A)

A sector is a small square subdivision of a standard map tile, typically 2.5 arcminutes on each side. This comes from taking a common 7.5-minute quadrangle—the standard map block—and dividing it into 3 by 3 equal parts. Each of those parts measures 2.5 minutes by 2.5 minutes. This subdivision lets map users reference a location within the quad with a fine, consistent grid. While the exact ground distance of 2.5 arcminutes varies with latitude due to the curvature of the Earth, the map grid itself remains a 2.5' by 2.5' square, which is the convention used in the source material. Larger sizes like 1° by 1°, 5' by 5', or 10' by 10' would cover much more area and don’t align with this standard subdivision.

A sector is a small square subdivision of a standard map tile, typically 2.5 arcminutes on each side. This comes from taking a common 7.5-minute quadrangle—the standard map block—and dividing it into 3 by 3 equal parts. Each of those parts measures 2.5 minutes by 2.5 minutes. This subdivision lets map users reference a location within the quad with a fine, consistent grid. While the exact ground distance of 2.5 arcminutes varies with latitude due to the curvature of the Earth, the map grid itself remains a 2.5' by 2.5' square, which is the convention used in the source material. Larger sizes like 1° by 1°, 5' by 5', or 10' by 10' would cover much more area and don’t align with this standard subdivision.