Create Stack

Create Stack Operator

Create Stack is a component of coregistration. The Create Stack Operator allows collocating two spatially overlapping products. Collocating two products implies that the pixel values of one product (the slave) are resampled into the geographical raster of the other (the master).

When two products are collocated, the band data of the slave product is resampled into the geographical raster of the master product.   In order to establish a mapping between the samples in the master and the slave rasters, the geographical position of a master sample is used to find the corresponding sample in the slave raster. If there is no sample for a requested geographical position, the master sample is set to the no-data value which was defined for the slave band. The collocation algorithm requires accurate geopositioning information for both master and slave products. When necessary, accurate geopositioning information may be provided by ground control points. The metadata for the stack product is copied from the metadata of the master product.

Resampling Methods Supported

• None (For interferometric processing, no resampling should be used here)
• Nearest Neighbour,
• Bilinear Interpolation, and
• Cubic Convolution.

Output Extents

• Master: the master image extents (Master extents are always used with "None" resampling)
• Maximum: both the common coverage and the non overlapping areas
• Minimum: only the common coverage

Parameters Used

1. Master Band: All bands (real or virtual) of the selected product. User can select one band (for real image) or two bands (i and q bands for complex image) as master band for co-registration.
2. Slave Band: All bands (real or virtual) of the selected product. User can select one band (for real image) or two bands (i and q bands for complex image) as slave band for co-registration.
3. Resampling Type: It specifies the resampling method.
4. Output Extents: The output image extent.