Point density

Defines a legend of a point density based on the value of a certain field.

Labelling field A drop-down menu opens where you can choose fields from the table (Double or Integer types) from which you can make a legend which represents the quantity of each value in the table. The properties of the points which represent the density of the values in the table can be changed.

• Point size: Use the arrow to change size of the point.

Point value: This is the numeric value which will be given to each point that is drawn.

• Colour: Choose the colour of the point by clicking on the button located right of the colour.
• Background colour: Choose the background colour.
• Outline: Click on this button if you want to give an outline to the symbol.

Intervals

This type of legend represents the elements of a layer using a range of colours. The gaps or graduated colours are mainly used to represent numeric data which have progression or range of values, such as population, temperature, etc.

Classification field: A drop-down menu where you can chose the attributes of the layer for which you want to make the classification for. The field must be numerical as it is a gradual classification (by the rank of the value)

• Interval type: There are three types of intervals from which to choose. These are:
  • Same intervals: Calculate same intervals from values which can be found in the chosen field to make the selection.
  • Natural intervals: The number of intervals are specified and the sample of this number is divided into this number according to the Jenk method of optimisation of the natural localisation of intervals.

Cuantil intervals: The number of intervals are specified and the sample is divided into this number but gathering into groups values according to their order. Number of intervals: Should indicate the rank or interval number which defines their classification.

• Nº of intervals: Type in the nº of intervals to be represented.
• Initial and final Colour: Select the colours that will be used to graduate. The initial colour for lower values and the final colour for the higher ones.
• Calculating intervals: Once the above options have been defined, click on the “Calculate intervals” button to show the final result. The default symbols and labels that appear can be modified by clicking on them, just as in the previous cases.
• Add: New ranks to the calculations can be added.
• Remove all / Remove: Allows you to delete all (remove all) or some (remove) of the elements which make-up the legend.

Graduated symbols

Represents quantities through the size of a symbol showing relative values.

• Classification field: Choose the numeric field for which the classification is to be made.
• Interval types: The same that are in legend type Intervals
• Symbol: Modify the symbol size with a minimum value (From), to a maximum value (Until). You can also modify all the features of a specific symbol by clicking on the “Template” button, as well as its “background”.
• Calculating intervals: Once the above options have been defined, click on the “Calculate intervals” button to show the final result. The default symbols and labels that appear can be modified by clicking on them, just as in the previous cases.
• Add: New ranks to the calculations can be added.
• Remove all / Remove: Allows you to delete all (remove all) or some (remove) of the elements which make-up the legend.

Proportional symbols

Represents quantities through the size of the symbol which shows exact values.

• Classification field: Choose the numeric field for which the classification is to be made.

Normalisation fields: Possibility of choosing a numerical field which normalises the results, maintaining the proportion of quantities.

• Symbol: Modify the symbol size with a minimum value (From), to a maximum value (Until). You can also modify all the features of a specific symbol by clicking on the “Template” button, as well as its “background”.

Expressions

Shows layer elements according to a certain filtered expression.

• ''New filtered expression:'' A new window opens where you can configure expressions (filters) upon which a certain symbol will be applied. Each of these will be shown as a row in the main window of this type of legend. The syntax these filters use is SLD.
• ''Modification of filtered expression:''You are able to modify an expression by selecting it.
• ''Delete a filtered expression:''You are able to delete an expression by selecting it.
• ''Up/Down buttons:'' Allows you to move the created expressions up or down so that they later have that order in ToC.

Unique values

Each register can be represented with an exclusive symbol according to the value it adopts in a certain field in the attributes table. It is the most efficient method for spreading categorical data, such as municipalities, floor types, etc.

You will find the following symbology configuration options:

• ''Classification field:''A drop-down menu opens where you can select the layer which contains the data to carry out the classification, in the attributes table field.
• ''Add all/Add:'' Once the “classification field” is selected, all the different values are shown by assigning a symbol (colour) different to each by clicking on the “Add All” button. These symbols can be modified by clicking on them. By default the label (name that appears on the legend) is similar to the value that is adopted by this field. By clicking on “Add” you can add new values to the list.
• ''Delete all/Delete:'' Allows you to delete all (delete all) or some (delete) of the elements that make up the legend.
• ''Symbol properties:'' If you right click on any of the “cells” on the “Symbols” you can modify its properties specifically through the “Select symbol” and “Symbology level” buttons, as well as being able to change the label name in TOC.