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Módulo de Interpolação

The Interplation plugin can be used to generate a TIN or IDW interpolation of a point vector layer. It is very simple to handle and provides an intuitive graphical user interface for creating interpolated raster layers (see Figure_interpolation_1). The plugin requires the following parameters to be specified before running:

  • Input Vector layers: Specify the input point vector layer(s) from a list of loaded point layers. If several layers are specified, then data from all layers is used for interpolation. Note: It is possible to insert lines or polygons as constraints for the triangulation, by specifying either “points”, “structure lines” or “break lines” in the Type selectstring combo box.
  • Interpolation attribute: Select the attribute column to be used for interpolation or enable the checkbox Use Z-Coordinate checkbox to use the layer’s stored Z values.
  • Interpolation Method: Select the interpolation method. This can be either ‘Triangulated Irregular Network (TIN)’ or ‘Inverse Distance Weighted (IDW)’.
  • Number of columns/rows: Specify the number of rows and columns for the output raster file.
  • Ficheiro de Saída: Especifique o nome para o ficheiro raster de saída.

  • checkbox Adicionar resultado ao projecto para carregar o resultado para o enquadramento do mapa.

Figure Interpolation 1:

../../../_images/interpolate_dialog.png

Módulo de Interpolação nix

Usando o módulo

  1. Inicie o QGIS e carregue uma camada de pontos vectorial (ex.: elevp.csv).

  2. Load the Interpolation plugin in the Plugin Manager (see The Plugins Menus) and click on the Raster ‣ Interpolation ‣ raster-interpolate Interpolation , which appears in the QGIS menu bar. The Interpolation plugin dialog appears as shown in Figure_interpolation_1.
  3. Seleccione uma camada de entrada (ex.: elevp selectstring) e a coluna (ex.: ELEV) para interpolação.

  4. Select an interpolation method (e.g., ‘Triangulated Irregular Network (TIN)’), and specify a cell size of 5000 as well as the raster output filename (e.g., elevation_tin).
  5. Clique [OK].