Here the theme is divided into four classes (surface cover points, Airport, Less agglomeration, larger agglomerations), each of these categories has its own fill color (Fill color), symbol type (Symbol) and size of the symbol (symbol size).
The class “Arealdekkpunkter” is set to appear in scales up to 1: 150 0000 (Minscale). When the user zooms in beyond this takes the other classes over. It is that they appear from a scale of 1: 150 0000 (Maxscale). This means that the index level displays all points with the same symbolization, when the user is at a scale ranging from 1: 1 to 1: 150 0000 gets points distributed on separate classes and then own symbols / colors.
To set the pixels to belong to the different classes (Airport, less agglomeration and larger agglomerations), we use the type (Expression type) “Logical expression”. It allows us to put together more sophisticated expressions (Expression). Example:
- Airport: ‘[objtype]’=’Airport’
Smaller agglomerations: ‘[tettbebygg]’=’Smaller agglomerations‘
Larger agglomerations: ‘[tettbebygg]’=’Larger agglomerations‘
Indicates both columns, comparison operators and values. Around columns used parenthesis “”. If the column is of type text, both kolonnnavn by square brackets and also the values enclosed in single apostrophes.
In the above example used comparison operator =.
The following is one screen for each class.
Example on legend, up to 1:150.000
Example on legend, from 1.1 – 1:150.000
Example on map, up to 1:150.000
Example on map, from 1:1 – 1:150.000