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Purpose

 

GPS data are imported into the SARscape Data Format for further processing.

 

Technical Note

 

GPS data can be used as input in the following processing steps:

 

-Refinement and Re-flattening (Interferometry module). Here the points are exploited to flatten the interferometric phase by adapting the phase value to the GPS time series.

-SBAS inversion. Here the points are exploited to adapt the displacement measurement to the GPS time series.

 

The imported data consist of an xml (SARscape GCP standard format) file in the selected "Cartographic System". Moreover a kml (geographic LAT/LONG co-ordinates) and a shape (.shp in the selected "Cartographic System") file are generated. In case the "Input Reference file" is entered, the shape file is generated also in the reference slant range geometry and the points falling outside the imaged area are automatically removed. It must be outlined that the shape and kml files are only for visualization purpose.

 

The shape file is intended to be visualized by means of the Time Series analyzer; what is shown it is the measurement history (referred to the earliest measurement) along the vertical component; if the "LOS Time Series" flag is checked, the measurement history is displayed along the satellite line of sight (Input reference geometry).

 

If the GPS inputs are consistent in terms of number of measurements per point, they are converted in a single output shape file; otherwise the program generates a shape file for each point. It must be noted that, if the number of measurement exceeds 2000, the shape is wrongly created and the dbf associated file cannot be accessed; in such case the measurement history cannot be visualized. To solve this problem the imported xml file must be under-sampled by means of the appropriate tool.

 

The output GPS shape files are used for visualisation purposes only and will not be used by any tool in SARscape. The time-series in the shape files show the absolute height value as default and the relative height respect to the first date, in case of re-projection in Line of Sight.

 

Supported Products

 

SINEX (.snx)

 

GSI (.pos)

 

Input Files

 

Input file list

Input file name(s) of the original GPS data. These files are mandatory.

 

Optional Files

 

Input Reference file

Input file of the reference slant range SAR image (_slc, _pwr). This file is optional.

 

DEM/Cartographic System

 

Output Projection

The following parameters are compulsory to define the Cartographic System:

 

State

Definition of the country or general projection systems.

 

Projection

Definition of the projection system of the selected State. In case that a general projection system is selected in State, the Projection is automatically set.

 

Ellipsoid

Definition of the ellipsoid. This is chosen according to the selected State and Projection.

 

Hemisphere

Definition of the hemisphere. This is chosen according to the selected State and Projection.

 

Zone

Definition of the zone. This is chosen according to the selected State and Projection.

 

Datum Shift Parameters

Definition of the datum shift parameters. These are chosen according to the selected State and Projection.

 

Reference Height

In case that the Digital Elevation Model is not used, a constant ellipsoidal height must be provided. Default Reference Height is 0.

 

Cartographic Parameters

The reference parameters for some projection systems (e.g. Stereographic, Polar Stereographic, Gnomonic, Mercator, Miller, Albers, etc.) can be set.

 

Parameters - Principal Parameters

 

Choice between Sinex and GSI format standards. This parameter is mandatory.

 

By setting this flag the time series of the shape files (.shp) is referred to the input line of sight.

 

Parameters - Global

 

It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.

 

Parameters - Other Parameters

 

It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.

 

Output Files

 

Output file

Output file name of the imported data. These file is mandatory.

 

.xml

Xml file containing the imported data.

 

_slant.shp

Shape file (plus .dbf and .shx) containing the measurement history in the input slant range geometry. This file is generated only if the "Input Reference file" is entered.

 

_geo.shp

Shape file (plus .dbf and .shx) containing the measurement history in the input "Cartographic System".

 

.kml

ASCII file containing the GPS points location in geographic co-ordinates. Double clicking on this file will automatically position the boundaries of the scene into the Google Earth environment.

 

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

 

General Functions

 

Exec

The processing step is executed.

 

Store Batch        

The processing step is stored in the batch list. The Batch Browser button allows to load the batch processing list.

 

Close        

The window will be closed.

 

Help

Specific help document section.

 

 

Specific Function(s)

 

None.

 

See Also

 

Task, SARscapeBatch object, SARscapeBatch script example

 

References

 

None.