Final answer:
A horizontal scale of 1000 kilometers is a map scale where a map distance corresponds to 1000 kilometers in the real world. Conversion between units such as meters and millimeters is essential for accurate interpretation and navigation.
Step-by-step explanation:
A horizontal scale of 1000 kilometers refers to a ratio or representation on a map or chart where a specific distance on the map corresponds to a real-world distance of 1000 kilometers. To convert distances, one might utilize conversion factors like the fact that there are 1000 meters in 1 kilometer, and 1 millimeter corresponds to 0.001 meter (1 km = 1000 m; 1 m = 1000 mm). For example, if a map has a scale stated as "1 mm to 1000 m", it implies that 1 millimeter on the map is equivalent to 1000 meters in the real world.
Understanding map scales and conversions is crucial in different geographic tasks, such as determining the actual distance between two locations on a map. Correct scale interpretation allows for accurate distance measurements and navigation. When working with topographic profiles or geodesy, an understanding of vertical exaggeration and the conversion between different units of measurement is also necessary.