Understanding Map Grid References

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Questions and Answers

What is the purpose of a grid reference system?

  • To measure the distance between two points on a map.
  • To identify the type of vegetation in an area.
  • To determine the elevation of land features.
  • To assign every item on a map a unique location reference. (correct)

What are the two types of grid references?

  • Four-figure and six-figure. (correct)
  • Latitude and longitude.
  • Eastings and northings.
  • Alphanumeric and numeric.

What term refers to the pattern of squares formed by vertical and horizontal lines on a map?

  • Datum
  • Legend
  • Coordinate
  • Grid (correct)

What are vertical lines on a map grid called?

<p>Eastings (C)</p> Signup and view all the answers

What direction do Eastings increase?

<p>Eastward (C)</p> Signup and view all the answers

What are horizontal lines on a map grid called?

<p>Northings (D)</p> Signup and view all the answers

Which is read first when giving a grid reference?

<p>Eastings (D)</p> Signup and view all the answers

What does a four-figure grid reference identify?

<p>The square in which a feature is located (C)</p> Signup and view all the answers

How is a square formed on a grid?

<p>By two eastings and two northings (A)</p> Signup and view all the answers

Flashcards

Grid Reference

A system for assigning a location reference to every item on a map.

Eastings

Vertical lines on a map numbered eastward (left to right).

Northings

Horizontal lines on a map numbered northward (bottom to top).

Four-Figure Grid Reference

Four-digit numerical reference for the square of a place.

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Order of Grid References

Eastings are stated before Northings when giving grid references.

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Six-Figure Grid Reference

A six-digit grid reference divides the grid into tenths to pinpoint a location.

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Study Notes

  • A grid reference is a system used to assign a location to items on a map.
  • This includes settlements, man-made structures, crops, and physical features.
  • Grid references can be either four-figure or six-figure numbers.
  • The term "GRID" refers to the pattern of squares formed by evenly-spaced vertical and horizontal lines on a map.
  • Vertical lines on a map are called Eastings, which are numbered in an eastward direction (left to right).
  • Horizontal lines are called Northings, and they increase in a northward direction (bottom to top).
  • Eastings are always written before Northings when providing a grid reference.
  • Items on the same horizontal line share the same northing number.

Four-Figure Grid Reference

  • A four-figure grid reference is a numerical reference that identifies the square in which a place, feature, or point is located.
  • Essentially, it serves as the name of the square.
  • Each square is defined by two eastings (vertical lines) and two northings (horizontal lines).
  • Each grid is has two sets of numbers, being 2 eastings and 2 northings.
  • When giving a grid reference, eastings are given first, followed by northings
  • Each grid is bordered by two eastings and two northings.
  • When using a 4-figure grid, use the lower of the 2 easting/northing numbers.
  • The four-figure grid reference for grid square one is easting 22 and northing 36, written as 2236.

Six-Figure Grid Reference

  • To create a six-figure grid reference, each grid square is divided into 10 equally spaced vertical and horizontal lines (although these may not be drawn on the map).
  • This allows for a more precise location to be identified.
  • To give a 6-figure grid reference, identify the eastings and a third number.
  • To find the third number add how many tenths the point or place is from the eastings after the first two digits of the four-figure grid reference.
  • Example: Point A is 5 tenths away from eastings 41. Add this number to eastings 41 to become 415.
  • Identify the northings and a third number.
  • The third northings number can be found by counting how many tenths the point/place is from the northings
  • Add this number after the second two digits of the four-figure grid reference.
  • Example: Point A is 5 tenths away from northings 53. Add this number to northings 53 and it becomes 5355.
  • The six-figure grid reference is written by combining the numbers together, such as 415535.

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