3.1.2 Import Raster

Raster Import Widget

Fig. 3.2 Raster Import Widget

Import raster files into LSAT Projects.

3.1.2.1 Usage

  1. Add at least one raster dataset. You can either drag and drop the rasters from your
    file manager into the input list (4) or select them from your PC (1).
  2. (Optional) Change the mask raster dataset from the projects default by unchecking (5) and
    either picking an input raster by selecting it in the list (4) and clicking (3) or pick a
    mask from your PC (6).
  3. (Optional) Change the output location of the output files by either typing in an existing
    folder or picking one from your PC (7)

  4. Start the import process (8) (the import dialog opens).

To remove a raster from inputs, select it and press the minus button (2).

To achieve the best results in later analyses do not change the mask raster dataset.

3.1.2.2 Import Dialog

Raster Import Dialog

Fig. 3.3 Raster Import Dialog

The raster import dialog opens from the import raster widget and by importing the projects mask when creating a new project

Usage

  1. Pick a resampling technique (3) best suited for the type of raster you want to import (1).

  2. Proceed with the import (4).

The input raster info (1) shows an embedded version of the Raster Info Widget for the import raster dataset.

You can compare basic information of the mask and import raster (2).

Resampling techniques:

NEAREST

Nearest-neighbor interpolation. Should be applied when transforming discrete data (e.g., classified raster datasets) such as lithology

CUBIC

Cubic spline interpolation. Should be used when projecting continuous datasets such as DEM.

BILINEAR

Alternative to Cubic spline interpolation when projecting continuous datasets.

3.1.2.3 Import Process

Raster Import workflow

Fig. 3.4 Schematic workflow for raster dataset import

LSAT PM compares five properties of the input raster dataset to the mask raster dataset:

  1. EPSG Code

  2. Raster dimension (Number of rows/columns)

  3. Raster origin

  4. NoData count

  5. NoData value

If all are the same the input raster dataset gets copied, else it gets reprojected.

If LSAT detects that the input raster is a discrete dataset it either copies an existing raster attribute table or creates a new one.

3.1.2.4 Input and Output

Input

Raster datasets (.tif)

Mask raster (.tif) providing the spatial reference and the cell size. (Default: project mask)

Output

Imported raster datasets (.tif) Path: /data/params/name.tif