Like Regular Reference Maps, Topographic Maps are a summary of the panorama and current important bodily (pure and man-made) choices in an area. The primary distinction is that they current elevation intimately.
Traits of topographic maps embrace:
they current elevation using contour strains. Put merely, a contour line is a line which joins components of equal elevation above sea diploma they’ve an emphasis on displaying human settlement (roads, cities, buildings and plenty of others), nonetheless would possibly embrace some thematic data equal to vegetation or the boundaries of nationwide parks they’re often produced by authorities corporations – these are typically specialist mapping corporations and could have each a civilian or defence perform they’ve properly outlined necessities (known as Specs) which might be strictly adhered to – these fluctuate between mapping corporations and the scale of the map they’ve wonderful location reference applications – along with latitude and longitude, nonetheless may also have grid strains usually have additional data equal to an arrow pointing to Magnetic North along with True North.
As there’s an exceptionally large amount of particulars about Topographic Maps obtainable on-line (additional so than another sort of mapping) we are going to give a fairly easy overview of it. See Further Learning underneath.
Topographic maps are sometimes part of a group of maps, nonetheless is also one–off / stand–alone maps.
- 1 Topographic Map
- 2 The Worldwide Map of the World and its Numbering System
- 3 Picture of Topographic Map Worksheet Reply Key
- 4 Obtain Topographic Map Worksheet Reply Key
- 5 Numbering Completely different Scale Topographic Maps
- 6 Related posts of "Topographic Map Worksheet Answer Key"
This extract from a 1:50,000 scale map has been annotated in pink to highlight fully totally different panorama choices which may very well be acknowledged using the contour strains. This map had a contour interval of 20 metres.
Elevation is usually confirmed using contour strains. In simplistic phrases a contour line is a line which joins components of equal elevation. The place these strains are above sea diploma they’re merely known as contour strains and the place they’re underneath sea diploma they’re known as bathymetric contour strains.
Contour strains can inform an educated reader many points regarding the type of the land and its ruggedness. The nearer contours are collectively the steeper the land and the extra they’re away from each other the flatter the land. On the Nullarbor Plain, for example, only some contour strains may be confirmed, nonetheless over the Snowy Mountains an infinite number of contour strains may be confirmed.
A phrase of warning: topographic maps do not current every contour line, fairly they choose sample of the strains. For example every 20, 50, 200 metres – counting on the scale of the map. That’s known as the contour interval of the map. On account of this selection course of, the excellence in density of the contour strains is solely indicating relative changes throughout the type of the panorama – on that map!
The finding out of topographic maps and interpretation of contour strains, is a rather a lot written about topic. Please seek the advice of with the Further Learning hyperlinks to be taught additional about contours and understanding what they indicate.
Topographic Maps as a Summary of the Panorama – an occasion
This topographic map and are of the equivalent area – the Manly space inside Sydney, NSW. By evaluating these two it is clear that the map is an excellent summary of the panorama of the realm. Bear in mind that the choices which dominate the moreover dominate the map. And, because of it is a topographic map, it moreover gives detailed particulars in regards to the ‘bumpiness’ of the land.
The Worldwide Map of the World and its Numbering System
In 1891 the Fifth Worldwide Geographical Congress agreed on the occasion of a world-wide, 1:1,000,000 (or 1:1 million) scale assortment of maps. This was to be known as the Worldwide Map of the World (or IMW for temporary). The maps had been to be produced using an internationally agreed, fixed specification.
For a lot of causes the occasion of the IMW maps was gradual – causes included two World Wars, the Good Melancholy and lack of funding in poorer worldwide areas. Worldwide curiosity waned and by the 1980s solely 800-1000 of the proposed 2500 maps had been achieved. The mission was abandoned by the mid-1980s. The Australian factor of the IMW was 49 maps. Work on these began in 1926 and was achieved in 1978.
Picture of Topographic Map Worksheet Reply Key
Obtain Topographic Map Worksheet Reply Key
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Numbering Completely different Scale Topographic Maps
Associated guidelines of a novel numbering system which had been developed for the 1:250,000 scale assortment topographic maps had been moreover developed for the 1:100,000, 1:50:000, 1:25,000 scale assortment topographic maps.
The 1:100,000 scale topographic maps had been nested contained in the IMW system. There are six 1:100,000 scale maps contained inside a 1:250,000 scale map.
On this case the system involved:
- using a two digit amount which is sequentially given to each 1:100,000 scale map West-to-East
- using a two digit amount which is sequentially given to each 1:100,000 scale map South-to-North
This results in a novel 4-digit amount for every 1:100,000 map contained in the system.
As with the 1:250,000 scale maps having a amount primarily based totally on the number of IMW zone they’re in; so to do the 1:50:000 and 1:25,000 maps. They’ve a sequential amount added to the number of the 1:100,000 map they occur in.
Bear in mind. This method is used for Sequence Topographic Maps by Australian authorities mapping corporations. Nonetheless, the earlier saying of “always rely on the stunning” applies. Some corporations use applications which might be primarily based totally on the IMW grid, nonetheless they may very well be barely fully totally different.
Moreover, this widespread grid system creates loads of maps which cowl small portions of land and large portions of landless ocean. Many mapping corporations ‘switch’ the map boundaries to maximise the amount of land which is confirmed.
Beneath are two indexes for mapping over north-western Australia. The very best one is the the Worldwide Map of the World (IMW) topographic maps. The underside one is for the World Aeronautical Charts (WAC) map assortment. Bear in mind how the WAC charts have been adjusted to maximise the amount of land they cowl.