Histogram properties

The Histogram Properties sheet lists all kind of important information on a selected histogram. In fact, all relevant information that is stored in the object definition file of the histogram is displayed. Furthermore, Property sheets are designed to handle the properties of dependent objects. For more information, refer to the Histogram operation or to Basic concepts : properties of objects. Note that you can calculate histograms of raster, polygon, segment and point maps.

The Histogram Properties sheet appears:

Histogram tab:

Object type and name:

Histogram "Name". When you click this flat button, the histogram will be (re)opened.

Domain:

For your information, the domain and domain type of the histogram table are listed.

General tab:

Object type and name:

Histogram "Name". When you click this flat button, the histogram will be (re)opened.

Location:

The path and directory where this object is stored.

Object date and time:

Date and time when this histogram was last changed.

Object size:

Total size of the histogram on disk in bytes. For raster histograms .HIS and .HI#; for polygon histograms .HSA and .HA#; for segment histograms .HSS and .HS#; for point histograms .HSP and .HP#.

Read only:

Select this check box if this histogram should be read only. You are then not allowed to edit or delete the histogram. Clear this check box if you want to be able to edit the histogram.

Description:

Optionally, change the description of this histogram. The description of a histogram appears in the title bar when the histogram is displayed. Further, the description is visible on the status bar of the Main window when moving the mouse pointer over the histogram in the Catalog.

Dependency tab:

Object type and name:

Histogram "Name". When you click this flat button, the histogram will be (re)opened.

Definition:

For your information, the expression by which this histogram was created is listed, i.e. the object definition.

Up-to-date or not:

Lists whether this histogram is up-to-date or not. If not, the name of the object which was changed last is shown including that object's date and time.

Depends on:

In a tree structure, it is listed on which objects this histogram depends (name of the map for which this histogram was calculated).

Make Up-to-Date:

When the histogram is not up-to-date and both the object definition file and a calculated data file exist: click this button to check the object on which this histogram depends, see if this object is up-to-date, if not, check all objects below, etc., and recalculate the data file of this histogram using all new changed objects.

Release disk space:

When both the object defintion file (.HIS, .HSA, .HSS, .HSP) and a calculated data file (.HI#, .HA#, .HS#, .HP#) exist: click this button to delete the data file of this histogram.

The expression by which this dependent histogram was created remains stored in the object definition file, so this histogram can always be recalculated.

Break dependency link:

Click this button to break the dependency links between this histogram and the map on which it depends and make this histogram an editable source object. Do not break dependencies if you want to be able to update this histogram in a later stage on the basis of changed input objects.

Additional Info tab:

Object type and name:

Histogram "Name". When you click this flat button, the histogram will be (re)opened.

Additional Info:

For raster histograms: summary information on the histogram is listed. For histograms of value raster maps: Mean, Median, Standard deviation, Predominant value, Number of undefined pixels, and Percentage intervals. For histograms of other raster maps: Predominant class name, ID, or color, etc. and Number of undefined pixels (if any).

Tips:

See also: