Thematics
This section allows you to create or modify a layer's thematics. Each layer can have 0, 1 or more thematics and each of these can be enabled or disabled.
The JMap administrator can define the default thematics that will be available for each layer of a project. As a user, you can also define your own thematics.
Refer to Thematic Maps for general information on thematics in JMap.
The thematics management interface is as follows:
Creating classification thematics
Creating a graduated styles thematic
To create a new thematic of this type, you need to select the numeric attribute to use, define the number of categories, select the range calculation method and define the category styles.
There are several methods for calculating the ranges of values for the categories of this type of thematic. See Methods for calculating ranges for more information.
The next section allows you to define the styles of the categories. There are two possibilities: create custom range styles or use predefined color schemes.
Custom range styles
You must define the from and to values of the style by indicating the style variables that will vary (e.g. border thickness, symbol size, fill color, etc.). The category styles are then generated by interpolation between the from and to styles. Optionally, a third style can be used to create an inflexion point. If an inflexion is defined, the generated styles will pass through the inflexion point at the specified position in percentage. The interface is different based on the element type of the layer.
Color schemes
Instead of manually defining styles, you can select a color scheme to generate the styles of the thematic's categories.
Creating a graduated symbols thematic
Only numeric attributes can be used for this type of thematic.
There are several methods for calculating the ranges of values for the categories of this type of thematic. See Methods for calculating ranges for more information.
The creation process is the same as for creating a graduated styles thematic, as described above.
Creating an individual values thematic
Numeric and alphanumeric attributes can be used with this type of thematic.
To create a new thematic of this type, basically all you need to do is to select the attribute to use.
JMap uses random colors for this type of thematic. You can modify styles manually or click on Color Schemes to use a predefined color scheme.
Creating an individual custom values thematic
Numeric and alphanumeric attributes can be used with this type of thematic.
The creation process is similar to creating an individual values thematic, except that you have the option to modify the list of individual values by adding, removing or modifying categories.
Creating proportional quantities thematics
Creating a proportional symbols thematic
Only numeric attributes can be used for this type of thematic.
To create a new thematic of this type, you need to select the numeric attribute to use and define the from and to styles. The symbol size and color will be interpolated between the from and to values.
Creating a pie charts thematic
Only numeric attributes can be used for this type of thematic.
To create a new thematic of this type, you need to select one or more numeric attributes to use and define the chart style.
Creating a bar charts thematic
Only numeric attributes can be used for this type of thematic.
The creation process is similar to creating a pie charts thematic, as described above.
Creating a legend
The last step in creating any type of thematic consists of creating its legend.
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