Question

classify maps on the basis of scale and subject matter? please answer in more than 700 words.

Answer 1

Map scale refers to the size of the representation on the map as compared to the size of the object on the ground. The scale generally used in architectural drawings, for example, is 1/4 inch to one foot, which means that 1/4 of an inch on the drawing equals one foot on the building being drawn. The scales of models of buildings, railroads, and other objects may be one inch to several feet. Maps cover more extensive areas, and it is usually convenient to express the scale by a representative fraction or proportion, as 1/63,360, 1:63,360, or “one-inch-to-one-mile.” The scale of a map is smaller than that of another map when its scale denominator is larger: thus, 1:1,000,000 is a smaller scale than 1:100,000. Most maps carry linear, or bar, scales in one or more margins or in the title blocks.
Nautical charts are constructed on widely different scales and can be generally classified as follows: ocean sailing charts are small-scale charts, 1:5,000,000 or smaller, used for planning long voyages or marking the daily progress of a ship. Sailing charts, used for offshore navigation, show a generalized shoreline, only offshore soundings, and are at a scale between 1:600,000 and 1:5,000,000. As an illustration of chart use, a 10-knot ship covers about 29 inches (74 centimetres) at 1:600,000 scale in a day.

General charts are used for coastwise navigation outside outlying reefs and shoals and are at a scale between 1:100,000 and 1:600,000. Coast charts are intended for use in leaving and entering port or navigating inside outlying reefs or shoals and are at a scale between 1:50,000 and 1:100,000. Harbour charts are for use in harbours and small waterways, with a scale usually larger than 1:50,000.

In rare instances reference may be made to the areal scale of a map, as opposed to the more common linear scale. In such cases the denominator of the fractional reference would be the square of the denominator of the linear scale.

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The linear scale may vary within a single map, particularly if the scale is small. Variations in the scale of a map because of the sphericity of the surface it represents may, for practical purposes, be considered as nil. On maps of very large scale, such as 1:24,000, such distortions are negligible (considerably less than variations in the paper from fluctuations of humidity). Precise measurements for engineering purposes are usually restricted to maps of that scale or larger. As maps descend in scale, and distortions inherent to their projection of the spherical surface increase, less accurate measurements of distances may be expected.

Maps may be classified according to scale, content, or derivation. The latter refers to whether a map represents an original survey or has been derived from other maps or source data. Some contain both original and derived elements, usually explained in their footnotes. Producing agencies, technical committees, and international organizations have variously classed maps as large, medium, or small scale. In general, large scale means inch-to-mile and larger, small scale, 1:1,000,000 and smaller, leaving the intermediate field as medium scale. As with most relative terms, these can occasionally lead to confusions but are useful as one practical way to classify maps.

The nature of a map’s content, as well as its purpose, provides a primary basis of classification. The terms aeronautical chart, geologic, soil, forest, road, and weather map make obvious their respective contents and purposes. Maps are therefore often classified by the primary purposes they serve. Topographic maps usually form the background for geologic, soil, and similar thematic maps and provide primary elements of the bases upon which many other kinds of maps are compiled.

Answer 2

Based on the scale and subject matter we can classify the maps.

Based on the scale the maps can be classified as,

Small scale map and large scale map

Based on subject matter maps can be classified as,

Cadastral Maps

Geologic Map

Climatic Map

Soil Map

Economic Map

Population Map

Small scale maps shows large area of land on a small space.

Small scale maps have small representative fraction.

Small scale maps include map of large nations and continents.

Small scale maps shows only less details than large scale maps.

A map which depicts smaller region is called large scale maps.

Large scale maps show more details about a small region.

Large scale maps are used to show site plans, local areas and towns.

Cadastral Maps:

Cadastral map is a large scale map.

It shows boundaries of subdivisions of lands.

It also show culture, drainage and other features related to use of land.

Some cadastral maps include name of districts, certificate of title numbers etc...

Geologic Maps:

Geological map is made to show various geological features.

Geological map represents the distribution of different types of rocks as well as locations of geologic structures.

They are actually four dimensional data systems.

Climatic map:

Climatic map is the depiction of prevailing weather patterns in a given area.

This map help to identity each zone.

They use a combination of precipitation, temperature, seasonal variations and geographic features to identify climate zones.

Soil map:

Soil map is a geographical representation showing diversity of soil types or soil properties.

It help in identifying the suitability of a soil for a particular crop.

Soil maps can be created in different scales.

Soil maps are used for land evaluation, spatial planning, agriculture extension and environmental protections.

Economic map:

Economic maps represent the various economic activities or phenomenon that takes place in a particular area.

This map contain different colours and symbols that refer to specific economic activities.

Population map:

It represents overall distribution of population within a particular area.

This map focuses on the population density in cities or towns.