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Questions and Answers
What is the purpose of a grid reference system?
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?
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?
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?
What are vertical lines on a map grid called?
What direction do Eastings increase?
What direction do Eastings increase?
What are horizontal lines on a map grid called?
What are horizontal lines on a map grid called?
Which is read first when giving a grid reference?
Which is read first when giving a grid reference?
What does a four-figure grid reference identify?
What does a four-figure grid reference identify?
How is a square formed on a grid?
How is a square formed on a grid?
Flashcards
Grid Reference
Grid Reference
A system for assigning a location reference to every item on a map.
Eastings
Eastings
Vertical lines on a map numbered eastward (left to right).
Northings
Northings
Horizontal lines on a map numbered northward (bottom to top).
Four-Figure Grid Reference
Four-Figure Grid Reference
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Order of Grid References
Order of Grid References
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Six-Figure Grid Reference
Six-Figure Grid Reference
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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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