A topographic map is a detailed and accurate graphic representation of cultural & natural features on the ground

Data

Find out the how to?

Sample Output

For property rights registration

Data

Find out the how to?

Sample Output

Reference to all survey works

Data

Find out the how to?

Sample Output

Reference to all survey works

Data

Find out the how to?

Sample Output

A representation of data that involves a manipulation of sorts to geographic space

Data

Find out the how to?

Sample Output

Areal data representations

1. Qualitative areal mapping - chorochromatic maps

2. Quantitative mapping - choropleth maps

chorochromatic data

choropleth data

Find out the how to?

Sample Output

Statistical mapping

1. Dot density map

2. Dot map

Data

Find out the how to?

Sample Output

Flow map are a type of thematic map used in cartography to show the movement of objects between different areas

A flow map uses linear symbols to represent movement

These movements icludes; people, highway traffic, trade goods, water, ideas, data etc.

Data

Find out the how to?

Sample Output

To find the proper symbology for a map, one has to execute a cartographic data analysis

Data will be of a qualitative or quantitative nature

1. Qualitative/nominal data - exists as discrete, named values without a natural order amongst the values
2. Quantitative data - can be measured, either along an interval or ratio scale

Information about qualities; information that can't actually be measured. Deals with descriptions. Data can beobserved but not measured. Examples

• Land cover classes(farm land, urban area, grass land)
• Soil types
• Political administration divisions

The application of colour would be the best solution

The colours used have to be of equal visual weight or brightness

Each of the elements should get equal attention, and none should stand out above the others

Deals with numbers. Data which can be measured and ranked. Examples

• Length, height, area, volume, weight, speed, time, temperature, humidity, sound levels, cost, members, ages, etc

We use two types of quantitative data in the realm of GIS

1. Absolute quantitative data
2. Relative quantitative data

Absolute quantitative data describe intrinsic characteristic of the feature being measured

To map absolute quantitative data the symbols used should have quantitative perception properties

Symbols varying in size with varying in quantity

Relative quantitative data is data related to geographic distributions

The size of the geographic unit will influence the perceptional properties too much

The numbers now have a clear relation with the area they represent

Value(brightness) is the best method of mapping Relative quantitative data

Queries about this Lesson, please send them to: jmwaura@jkuat.ac.ke

*References*

• Analytical and Computer Cartography, 2nd ed. Keith C. Claike
• Geographic Information Systems: The Microcomputer and Modern Cartography, 1st ed. Fraser Taylor