TGIS_IsochroneMap class

DK11 for Java | tatukgis.jdk.TGIS_IsochroneMap | Classes | Constructors | Methods | Properties

Network analysis tool for creating isochrone maps - for a given point finds the network area reachable within a given maximum network traversing cost.

Available also on: Delphi | .NET | ActiveX | Python.

// Java
public class TGIS_IsochroneMap extends TGIS_BaseObjectDisposable {
};

// Oxygene
type
  TGIS_IsochroneMap = public class( TGIS_BaseObjectDisposable )
  end;

→ TGIS_BaseObjectDisposable

For general information about isochrone maps see this article on Wikipedia.

TGIS_IsochroneMap uses topological network (TGIS_Network) for calculations (the same as TGIS_ShortestPath). If the network is not available for the analyzed layer then it will be created automatically. Depending on the size of the layer it may be a prolonged operation. Once created the network is saved into a set of files and can be reused.

The creation of an isochrone map can also be a time consuming operation for large and complicated networks and/or relatively big traversing cost.

Sample results from isochrone analyses:

Points	Arcs	Polygons	Interpolation (splines)

Steps to achieve:

• Points
  1. Use Generate() with TGIS_ShapePoint as the output type
  2. Colorize the layer by the cost field (GIS_COST by default)
• Arcs
  1. Use Generate() with TGIS_ShapeArc as the output type
  2. Colorize the layer by the cost field (GIS_COST by default)
• Polygons
  1. Use Generate() with TGIS_ShapePolygon as the output type
  2. Repeat above desired number of times decreasing the cost each time
  3. Colorize the layer by the cost field (GIS_COST by default)
• Interpolation
  1. Use Generate() with TGIS_ShapePoint as an output type
  2. Use TGIS_InterpolationSplines to generate interpolated grid layer
  3. Colorize the grid layer

• IsochroneMap sample