Classification via Classes or Unique values

It is strongly recommended to read first the brief overview about Classification.

Example: World Population Density

• Classification using Classes (range of values)
• Classification using Unique Values

• Add, Remove and Order Classes or Values
• Changing the presentation of the selected Graphical parameter(s)
  • Double click and edit
  • Single Values or Ranges
  • Auto Parameter
• Changing the Labels of the Classes/Values
  • Auto Label

1. Select a formula to calculate the range breaks, see below
2. Define the number of classes.
3. Orbit will auto-calculate the breaks for each value range using the attribute values of all objects and the chosen formula.
4. If required adjust the value range of each class manually using the Min / Max attribute fields.

Formulas to auto-calculate the value ranges:

• Equal Interval
  Each class will have the same length of range: (maximum attribute value - minimum attribute value) / number of classes.
• Equal Amount
  Each class will have (approximately) the same number of objects: (total number of objects) / number of classes.
  One can still add or remove the classes manually, see below.
• Natural
  Classes will be calculated to obtain a normal (Gauss-Krüger) distribution of objects (and values): more information, Wikipedia, Normal Distribution|

Parameters:

• Single Values or Ranges: See below
• Amount: Check the number of objects in each class.

Notes:

• From To: A range starts with and includes the minimum value. The range stops at and does not include the maximum value
• Redefining the number of classes will auto-calculate the ranges again. If you would like to add a class use the control buttons, see below.
• Do not use String-attributes to define classes. The division into classes is not reliable with String-values.

Notes:

• All existing values will be listed
  When choosing for unique values Orbit will list alphabetic every unique value of the selected attribute.
  You may wish to prepare a legend to represent future objects as well, which may have other values than present. Simply add a class and enter the value, see below.
• Manageable amount of values
  Listing all unique values may lead to hundreds of records. It is advised to keep the amount of classification values limited. The use of classes may be helpful to do so.

1. Add a new class/value.
2. Delete the selected class/value.
3. Move the selected class/value one up in the legend display.
4. Move the selected class/value one down in the legend display.

Double click the graphical presentation (field “Parameters”) to edit the selected graphical parameter(s), for example:

• Fill.Color: The edit fields present a color chooser.
• Group Line: Only or all the outline graphic parameters can be modified.
• All Parameters : All graphical parameters can be modified. The list of available parameters depends the spatial type of the dataset model.

Single Values
Each class/value has one graphical representation.


Ranges
Only when using classes it is possible to define a from - to graphical representation. The Min and Max presentation for each class (range) can be set.
Any attribute value in between will be interpolated.

Use the Auto Parameter function to apply well-defined palette or pattern on the selected graphical parameter.
This functions is available for:

• Outline Color
• Fill Color
• Line Width
• Symbol Size
• Symbol Name

For more information, see Auto Parameter

For display purposes you may want to assign a label to each class or value. Legend Displays are used in the Legend Display and can be used on a printout via the Print Layout.

Just click the label field (right of the graphical presentation) and enter a label text.

Use of Auto Label:

• No value list is defined: Auto Label will copy the attribute value to the legend label field
• A value list is defined: Auto Label will copy the value list label to the legend label field.

Note:

• If the value list is defined and the value list label is empty, an empty entry will be copied to the legend label field.