samples:samples:classification
Table of Contents
Classification sample
Documentation | Samples | Classification
Summary
Classification sample — demonstrates thematic data classification of vector and raster (pixel) layers using the TatukGIS TGIS_ClassificationAbstract API.
Description
What the sample shows:
- Loading a raster layer (DEM/grid) into the viewer
- Creating reclassification rules to remap pixel values to new ranges
- Two reclassification strategies:
- Table-based: specifying input range (min/max) → output value mappings in a data grid
- Altitude zones: using predefined elevation zones (sea level, low, mid, high, alpine)
- Applying reclassification rules to generate a new classified raster layer
- Handling “no data” values (pixels with no valid data) during reclassification
- Displaying progress during reclassification (ProgressBar)
- Visualizing the reclassified result with a legend showing new classes
- Comparing original raster with reclassified output side-by-side
- Using data grid interface for interactive rule definition
- Supporting both manual and preset classification schemes
This sample illustrates use of:
| Name | Description |
|---|---|
| TGIS_ClassificationAbstract.Target | Indicates the data used for classification; empty by default. |
| TGIS_ClassificationAbstract.NumClasses | Number of classes; default is 5, maximum is 30. |
| TGIS_ClassificationAbstract.StartColor | Starting color used to generate the color ramp for class breaks; White by default. |
| TGIS_ClassificationAbstract.EndColor | Ending color used to generate ramp for class breaks; Black by default. |
| TGIS_ClassificationAbstract.ShowLegend | If True, classes are shown in the legend panel; True by default. |
| TGIS_ClassificationAbstract.Method | Classification method; NaturalBreaks by default. |
| TGIS_ClassificationAbstract.Interval | Class interval size; default value is 1. |
| TGIS_ClassificationAbstract.Classify | Performs the classification. |
| TGIS_ClassificationAbstract.MustCalculateStatistics | Indicates whether statistics for the assigned layer must be calculated. |
| TGIS_ClassificationVector.StartSize | Starting size or width for generating Params section; default value is 1. |
| TGIS_ClassificationVector.EndSize | Ending size or width for generating Params section; default value is 480. |
| TGIS_ClassificationVector.ClassIdField | If not empty, the attribute field with the specified name is populated with class identifier values. |
| TGIS_ClassificationVector.RenderType | Visual property affected during classification; Color by default. |
Code
This sample is available on the following platforms (click to view the source code on GitHub):
2026/07/05 05:38