Purpose

This processing chain is meant to be used with TanDEM-X data only, for general purpose please use the InSAR Digital Elevation Model Workflow tool.

This functionality enables to execute, in a single iteration, the following processing sequence:

–Interferogram Generation and Flattening.

–Adaptive Filter and Coherence Generation.

–Phase Unwrapping.

–Phase to Height Conversion and Geocoding.

The final purpose of this processing chain is the generation of an Interferometric Digital Elevation Model.

Technical Note

Details specific to each step implemented here are described in their respective reference guide section. We recommend to read them carefully.

Input

Input Files

Input Reference file
File name of the Reference data (_slc). This file is mandatory.

Input Secondary file
File name of the Secondary data (_slc). This file is mandatory.

DEM/Cartographic System

Reference Type

The choice is given between the three following options:

•Input DEM: the provided "Input Digital Elevation Model" file is used in the process;

•Reference Height: in case that the Digital Elevation Model is not used, the parameters needed to define the Cartographic System, the pixel spacing and the reference height are compulsory;

•DEM Download: The Digital Elevation Model Extraction tool is used to download an online digital elevation model. Various sources are available, see this section for further information.

note that the choice of one source is compulsory.

Parameters

Grid Size

The grid size of the output data must be defined; the default unit of measure is meters.

Note that - for the Geographic projection - if values higher than 0.2 are entered they will be considered as metric units and then automatically, and roughly, converted from meters to degrees; if values lower than 0.2 are entered they will be considered as degree and used as such without any conversion.

Interferogram Generation

It brings to the principal parameters of the Interferogram Generation step. Refer to the relevant section technical note for further information about the process and other Preferences parameters.

Adaptive Filter and Coherence

It brings to the principal parameters of the Adaptive Filter and Coherence Generation step. Refer to the relevant section technical note for further information about the process and other Preferences parameters.

Phase Unwrapping

It brings to the principal parameters of the Phase Unwrapping step. Refer to the relevant section technical note for further information about the process and other Preferences parameters.

Phase to Height Conversion

It brings to the principal parameters of the Phase to Height Conversion and Geocoding step. The default Spatial Wavelet Size (m) is adopted.

Refer to the relevant section technical note for further information about the process and other Preferences parameters.

Output

Output Root Name

Name of the output root. This file is mandatory.

Delete Temporary Files

By setting this flag, temporary files which are created in the intermediate steps, are automatically removed. All of the intermediate files are kept otherwise, refer to the Output lists relevant to each processing step for further information.

_dem

Digital Elevation Model with the associated header files (.sml, .hdr).

_dem.shp

By setting this flag the DEM is generated in vector (.shp) format.

_dem.las

By setting this flag the DEM is generated in point cloud (.las) format.

_cc_geo

Geocoded coherence with the associated header files (.sml, .hdr).

_precision

Estimate of the data quality with the associated header files (.sml, .hdr). This file is used during the Digital Elevation Model mosaicing (Tools).

_resolution

Spatial resolution based on the local incidence angle with the associated header files (.sml, .hdr). This file is used during the Digital Elevation Model mosaicing (Tools).

Details specific to the Units of Measure and Nomenclature of the output products can be found in the Data Format section.

General Function(s)

Preview

By setting this flag, the temporary files are made available to visualize after a single step in the chain.

Delete Temporary Files

By setting this flag to false, It is possible to keep all the temporary files created during the processing. The files are located in the ENVI Output Directory in a folder with the following name: SARsTmpDir_ddmmmyyyy_hhmmss

Save

Clicking this button allows to save and close the workflow at the actual step. After saving the workflow the window will be closed

Open

Clicking this button allows to open a previously saved workflow.

< Back

Clicking this button the previous step of the workflow is shown.

Next >

Clicking this button the actual step of the workflow is performed. once finished, the next step is shown.

Next >>>

Clicking this button all the steps are performed in succession and it is no more necessary to use the "Next >" button. Make sure that all settings in all the steps are correctly set before starting with this processing.

The window will be closed.

References

Consult the reference guide specific to each processing step.

Interferometry - InSAR TanDEM-X bistatic DEM Workflow

Interferometry - InSAR TanDEM-X bistatic DEM Workflow

Purpose