Which one of the following denotes the lines joining equal amount of travel time?
Isochrone
This question asks about the specific term used for lines that connect points experiencing the same amount of travel time from a particular starting point. These lines are a type of isoline, which are lines that join points of equal value for a specific variable on a map.
Understanding Lines of Equal Value
Maps often use lines to show areas or points that share a common characteristic or value. These lines are called isolines. Different types of isolines are named based on the variable they represent.
- Isohaline: These lines connect points of equal salinity in a body of water (like an ocean or lake). Salinity refers to the amount of salt dissolved in water.
- Isochrone: These lines connect points that are equidistant in terms of travel time from a specific location. For example, an isochrone map might show how far you can travel in 30 minutes from a city center using a particular mode of transport.
- Isoheight: Also commonly known as contour lines, these lines connect points of equal elevation above a specific reference level (like sea level). They are used on topographic maps to show the shape and height of the land.
- Isopleth: This is a more general term for any isoline that connects points of equal value for a variable, often one that varies continuously over space, like temperature (isotherms) or pressure (isobars). Isochrone lines are a specific type of isopleth.
Analyzing the Options
Let's look at how each option relates to the question about equal travel time:
- Isohaline: Relates to equal salinity, not travel time.
- Isochrone: Relates to equal travel time, which matches the question.
- Isoheight: Relates to equal elevation, not travel time.
- Isopleth: This is a general term, but the question asks for the specific term for equal travel time. Isochrone is the specific term needed here.
Based on the definitions, the line joining equal amounts of travel time is specifically called an Isochrone.
Comparison Table of Isolines
| Term | Value Represented | Example Use |
|---|---|---|
| Isohaline | Salinity | Mapping ocean salt levels |
| Isochrone | Travel Time | Mapping accessibility from a point |
| Isoheight (Contour) | Elevation | Topographic maps |
| Isopleth | General term for equal value | Mapping temperature, pressure, population density, etc. |
Conclusion
The term that specifically denotes lines joining equal amount of travel time is Isochrone.
Revision Table: Key Geographic Lines
| Line Type | Connects Points of Equal... |
|---|---|
| Isobar | Atmospheric Pressure |
| Isotherm | Temperature |
| Isohyet | Precipitation |
| Isohel | Sunshine Duration |
| Isobath | Water Depth |
| Isochrone | Travel Time |
| Isohaline | Salinity |
| Isoheight (Contour) | Elevation |
Additional Information on Isochrone Maps
Isochrone maps are very useful in urban planning, transportation analysis, and understanding spatial accessibility. They can show how reachable different areas are from a central point using various modes of transport like driving, walking, cycling, or public transport. The shape of isochrones can reveal bottlenecks in transport networks or areas that are difficult to access.
For instance, an isochrone map showing driving time from a city center might show that areas with good highway access have longer, more extended isochrone lines compared to areas with congested local roads.
Important Questions from Mapping
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Which one of the following countries do NOT have direct access to the sea/ocean?
Which one of the following features is the result of erosion and deposition work of a river ?
