Creating symbols
ArcGIS for Desktop allows you to display geographic features using symbols on the map based on their attributes. With symbols, you can display unique values or ranges of values on a map. The resulting maps are also known as thematic maps. There are two types of thematic maps: qualitative and quantitative. Thematic maps can represent four types of attribute data, as follows:
- Nominal (qualitative maps): This refers to the category or discrete values (name of countries, soil types, or land use categories)
- Ordinal (quantitative maps): This refers to the category values that are ordered based on rank or importance (classification of rivers, levels of education, or vehicle traffic)
- Interval (quantitative maps): This refers to the quantity values that compare the relative importance of values having an arbitrary zero (temperature, scale, or pH values)
- Ratio (quantitative maps): This refers to the quantity values that compare the relative importance of values having an absolute zero...
