How is a ratio scale used to determine distance on a map?

How is a ratio scale used to determine distance on a map?

The lengths of lines are easily measured from a map. Just measure the distance with a ruler and then multiply that by the number in the ratio scale of the map. If it’s 10 cm between the cities on the map, and the map scale is 1:100,000, then the distance is 1 million centimeters (10 cm × 100,000 = 1,000,000 cm).

How do you teach scales on a map?

Demonstrate how to measure distance using the map scale. Line up a piece of plain paper so its edge is even with the map scale on the projected map. Mark in pencil the beginning and the end of the scale. Write the number of miles (or kilometers) that this distance represents.

How is the detail of a map determined?

Map detail is determined by the source scale of the data: the finer the scale, the more detail. • Source scale is the scale of the data source (i.e. aerial photo or satellite image) from which data is digitized (into boundaries, roads, landcover, etc. in a GIS).

Where do you find the map scale on a map?

When reading a map, you need to refer to a set of instructions in order to understand distances in real life. A map scale is a ratio of the distance on a map to the actual distance of the ground. Map scales can usually be found on the outer edge of a map, usually near the map’s key (a set of symbols that also make the map easier to understand).

How is the detail of a GIS determined?

Map detail is determined by the source scale of the data: the finer the scale, the more detail. Source scale is the scale of the data source (i.e. aerial photo or satellite image) from which data is digitized (into boundaries, roads, landcover, etc. in a GIS).

What does source scale mean in a GIS?

• Source scale is the scale of the data source (i.e. aerial photo or satellite image) from which data is digitized (into boundaries, roads, landcover, etc. in a GIS). • In a GIS, zooming in on a small scale map does not increase its level of accuracy or detail.