A Escala Gráfica e a Escala Numérica

Summary

This video explains the concept of map scales, focusing on how distances on a map represent real-world sizes. It introduces two types of scales: graphic and numerical. The graphic scale uses a visual line to show the proportional relationship between map measurements and real-world distances, while the numerical scale expresses this as a ratio, such as 1:6,000. Both scales serve the same purpose but are presented differently. The video also highlights the conversion between units, demonstrating how to interpret and apply these scales for accurate distance calculations on maps.

Takeaways

• 😀 Maps are representations of terrestrial spaces in a reduced scale.
• 😀 Distances on maps are calculated using a resource called 'scale'.
• 😀 The scale indicates the proportion between the real size of an area and its representation on paper.
• 😀 For example, a map might represent a city where each 1 cm on the map corresponds to 60 meters in real life.
• 😀 Quarters and streets on maps are scaled down to fit within the reduced dimensions of the map.
• 😀 The map's scale helps in understanding the actual size of areas represented on it.
• 😀 There are two types of scales: graphic scale and numerical scale, both serving the same purpose.
• 😀 A graphic scale is shown as a drawn line, with each 1 cm corresponding to real-life distances (e.g., 1 cm = 60 meters).
• 😀 A numerical scale is expressed with numbers, indicating the real-world distance for a unit of measurement on the map.
• 😀 In the numerical scale, 60 meters equals 6000 centimeters, meaning 1 cm on the map represents 6000 cm in real life.
• 😀 Understanding both types of scales is crucial for interpreting distances accurately on maps.

Q & A

What is the primary purpose of a map's scale?

The primary purpose of a map's scale is to show the relationship between the size of the map's features and their actual size in the real world, helping us calculate real-world distances from the map.

How does scale help in measuring distances on a map?

Scale allows us to convert the reduced measurements on a map into real-world distances. By knowing the scale, we can determine how much a specific distance on the map represents in reality.

What does it mean when a map has a scale of 1 cm = 60 meters?

It means that each centimeter on the map corresponds to 60 meters in the real world. This allows us to scale up the map's measurements to real-world dimensions.

What is a graphical scale?

A graphical scale is a visual representation of the map's scale, typically shown as a line with measurements. It shows how distances on the map correspond to real-world distances.

How do we calculate the real distance for a given number of centimeters on a map using a graphical scale?

If the graphical scale shows that 1 cm equals 60 meters in the real world, then 2 cm would represent 120 meters, and so on. We simply multiply the number of centimeters on the map by the real-world value for 1 cm.

What is the difference between a graphical scale and a numerical scale?

A graphical scale uses a line to visually represent the scale, while a numerical scale expresses the scale as a ratio or fraction, such as 1 cm = 60 meters, without any graphical representation.

How does a numerical scale express the map's scale?

A numerical scale expresses the map's scale in terms of a ratio or fraction, for example, 1 cm on the map equals 60 meters in reality, which can be written as a ratio (1:6000) when converting to centimeters.

How do we convert map measurements to real-world measurements using a numerical scale?

To convert map measurements to real-world measurements, multiply the number of centimeters on the map by the real-world equivalent in centimeters. For example, 1 cm on the map equals 6000 cm in reality if 1 cm equals 60 meters.

Why is it important to understand map scales when reading a map?

Understanding map scales is crucial because it allows you to accurately determine distances, plan routes, and navigate effectively, ensuring that the information on the map is interpreted correctly in relation to the real world.

How can we use both graphical and numerical scales to interpret the same map?

Both graphical and numerical scales convey the same information, so either can be used to calculate real-world distances. The graphical scale provides a visual line, while the numerical scale provides a mathematical ratio, but both will yield the same results when used correctly.