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Isopleth Method

Correct option is (b) isopleth

Correct option is (a) circles

Wrong. 

Dot method maps or choropleth method maps are used to show population distribution

• Distribution of a population is discontinuous. 
• Isopleth method maps are used to show the distribution of variables which are continuous. For eg. altitude, temperature etc. 
• Thus, isopleth method maps are not used to show population distribution.

An isopleth method map, is a map type, that shows distribution of a variable with the help of lines showing equal values.

• The dot method of making a distributional map is best suited to show the distribution of the population in a region. 
• The dots used in this method, are given a particular value which is determined by selecting a proper scale considering the spread of the values of the variables in the given region. 
• This method is best suited to show the distribution of the variables which are freely scattered as in the case of population distribution.

The dot method has been used to show the distribution of population in the district.

(i) The rainfall is more in the Western part of the district.

(ii) The rainfall is decreasing towards the East.

(iii) O to 600 mm class shows low rainfall category in the district.

(iv) More than 2400 (2400 to 3000 mm) class shows high rainfall category in the district.

(v) The Isopleth method has been used in making this map

1. In the choropleth method various geographical variables are shown by shades or tints of various colours. 

2. While making choropleth maps, the data used for different variables is obtained through various processes such as measurement, surveying and so on. 

3. In this method, only one value is given to one sub – administrative unit in a region 

4. The smallest and the largest values of the given data of the variables are taken into consideration and after that 5-7 classes are made.

5. Each class is assigned a tint of the same colour or black-and-white patterns. The shades or the patterns become darker with the increasing values of the given variable.

A dot method map is a map type, that shows the distribution of a variable using dot symbols.

Wrong. 

In choropleth maps, colours/tints change according to the values of variables.

• In choropleth maps, the smallest and the largest values are taken into consideration and after that 5-7 classes are made.
• Each class is assigned a unique tint of the same colour or black and white pattern. 
• In other words, each class is used to show the distribution of a particular variable in subadministrative unit.

Wrong. 

Isopleth maps and not the choropleth maps are used to show altitude.

• When the distribution of a variable is continuous like the altitude, the 
• isopleth method map is used. Isopleth maps use lines joining the locations having equal values and hence are useful to show the change in altitude in the region. 
• When the distribution of a variable is discontinuous, the choropleth method map is used to show its distribution, eg. distribution of population, domestic animals, etc.

(a) Use of distributional maps: The distributional maps are useful for explaining the patterns of distribution of a particular geographical variable. 

(b) The types of distributional maps : The following are the types of distributional maps.

1. Dot Method: The distributional map based on statistical data, made by this method, make use of dots of a pre-decided size to show the distribution of a particular variable, e.g. Dot method map is used to show the population of a region, distribution of cattle etc. 

2. Choropleth Method: The distributional map made by this method makes use of shades or tints of various colours, to show the distribution of a particular variable, e.g. Choropleth method map is used to show population density, types of forest cover, uses of land.

3. Isopleth Method: The distributional map made by this method makes use of lines joining locations or places having same or equal values of a particular variable, e.g. Isopleth method map is used to show altitude, temperature, rainfall.

Maps that show the distribution of various geographical variables are called ‘distributional maps’.

Correct option is (a) dot

(i) The population of the Amravati town is nearly 5 lakhs.

(ii) Achalpur has a population of 1 lakh

(iii) The northwestern part of the map shows sparse distribution of population

The report written on the basis of the information obtained from a field visit is known as field report.

The statistical data of particular variables with respect to various places is called ‘point-related data’.

Correct option is (b) three

The distribution of the population is dense in the Eastern part of the district, whereas the western part of the district has low density of population.

Correct option is (d) distribution

Correct option is (a) statistical

Maps that are prepared with special themes are called ‘thematic maps’.

• Before going for a field-visit, decide the place and the purpose of the visit. 
• The elements which will be observed in field visit should be decided. 
• For a field visit, you should carry a notebook, specimen Questionnaire , 
• pen, pencil, scale, tape, compass, a bag for collecting samples, maps, camera and any other item needed.

Right.

• Geographical concepts and elements can be directly experienced through field-visits. 
• Field-visits are extremely useful for understanding the correlation between human beings and the environment.

Gaganbavada Taluka has the least population.

The population shown by the largest circle is nearly 20 lakhs. That place is Kolhapur city (Karvir Taluka)

1. A field-report should be written on the basis of information obtained after the visit is complete. 

2. Students should add photographs wherever necessary. 

3. The following points should be used to make a field report:

• Introduction 
• Location map and Route Map 
• Physiography
• Climate
• Population 
• Environmental problems and measures 
• Land utilisation 
• Conclusions

1. Geographical field-visit is organised for study of various elements, for example physical 1 landforms, river banks, dams, coastal areas, tourism sites, offices or museums related to geographical elements, villages or forest areas. 

2. Elements should be selected after studying : the local conditions and necessary permission letters should be obtained.

Correct option is (b) choropleth

The various elements which can be studied during geographical field visits include physical landforms, river banks, dams, coastal areas, tourism sites, offices or museums related to geographical elements, villages, forest areas etc.

The various things which one should carry to a geographical field visit include notebook, specimen Questionnaire, pen pencil, scale, tape, compass, bag for collecting samples, maps, camera, etc.

Correct option is (b) Field visit

Right 

1. In choropleth maps, the data regarding various geographical variables is shown by shading or using tints of various colours. 

2. After gathering the data for a selected variable, five to seven classes are made considering the smallest and the largest values.

3. Each class is assigned a tint of the same colour or black-and-white patterns. 

4. A particular value shown by a predecided tint of colour can represent only a particular region or group of region.

Thus, in choropleth maps, only one value is assigned to sub administrative unit.

(i) Anjangao Surji has population density between 301 and 400 persons per sq km

(ii) Amravati taluka has the population density of more than 400 persons per sq km

(iii) Dharini, Chikaldhara, Daryapur, Chandur Bazar, Morshi, Varud, Tivsa, Dhamangaon Railway, Nandgaon Khandeshwar and Bhatkuli have population density less than 300 persons per sq km.

(iv) Chikaldhara has population density of less than 100 persons per sq km.

(v) Amravati and Achalpur have the population density of more than 400 persons per sq km.

(i) The density of population is decreasing towards the North and South direction.

(ii) Shahuwadi, Gaganbavada, Ajra and Chandgad have a population density of less than 200.

(iii) Radhanagri and Gargoti have population density between 200 and 400.

(iv) Kolhapur, Panhala, Hatkanangale, Shirol, Gadhinglaj and Kagal have population density more than 400.

(v) The Eastern part of Kolhapur has a higher density of population.

(v) Choropleth method is used in making this map.

Wrong. 

Distribution of various geographical elements cannot be shown using dot method. 

• Distribution of geographical elements which are freely scattered across a region can be shown using a dot method. 
• Distribution of variables like population, minerals, cattles etc., are freely scattered hence can be shown on a dot method map. 
• Whereas the distribution of variables like rainfall, altitude, temperature etc. which are continuous, cannot be shown using a dot method map.

Right. 

The size of the dot is decided as per the value of a variable that is freely scattered across the region.

A choropleth method map is a map type, in which the distribution of a variable is shown by shades or tint of various colours.

(i) Rainfall is more in the Northern part of the district.

(ii) Rainfall is decreasing towards the west

(iii) The lowest value of the rainfall in the district is less than 800 mm.

(iv) The highest value of the rainfall in the district is more than 1300 mm.

(v) The amount of rainfall in the central part of the district is 900 mm.

Wrong. 

Isopleth maps are made using isolines. 

• Isolines are lines joining places of same values of a given variable in a map. 
• Since, isopleth maps are also prepared in the same method, we can say that they are made using isolines.

We use the isopleth method for showing the distribution of a variable on a map, when the distribution of the variable is continuous.

(1) Dot method

(2) Isopleth method

(3) Dot method

(4) Choropleth method

(5) Isopleth method

Correct option is (a) continuous

Dot method is Cotton crop distribution in Maharashtra.