Gamma DIFF&GEO: Reference Manual

S1_poly_overlap

NAME
S1_poly_overlap - Script to determine polygons for overlap regions in Sentinel-1 TOPS data.

SYNOPSIS
S1_poly_overlap <SLC_tab> <rlks > <azlks> <poly> [overlap_type]

<SLC_tab>	(input) 3 column list of TOPS burst SLC (SLC, SLC_par, TOPS_par; row order IW1, IW2, IW3)
<rlks>	(input) range looks to consider (default=1 (SLC))
<azlks>	(input) azimuth looks to consider (default=1 (SLC))
<poly>	(output) polygon file for overlap regions (ASCII)
[overlap_type]	overlap type selection: default = 1: burst overlap, 2: sub-swath overlap)

EXAMPLE
S1_poly_overlap 20141003.SLC_tab 10 2 20141003.burst_overlap.poly 1

Determines a polygon file (ASCII), with polygons for all burst overlap regions (expressed in the indicated multi-look geometry).

DESCRIPTION
S1_poly_overlap is used to defnie polgons for the burst or sub-wath overlap regions of a S1 IWS burst SLC. The geometry of the S1 IWS burst SLC is available from the TOPS_par files for the different sub-swaths included. The TOPS_par files are found in the SLC_tab indicated on the command line.

Polygon files can be used to modify the image data in the polgon areas. Specifically, this is used to set the co-registration lookup table values to zero (NULL = no data) in S1_coreg_TOPS. As a consequence only the burst overlap areas are resampled when running SLC_interp_S1_TOPS with the masked looklup table - which is substantially faster. To do this the same multi-looking in range and azimuth has to be indicated as for the calculation of the MLI mosaic geometry used in the lookup table calculation (e.g. 10 range x 2 azimuth looks)

S1_poly_overlap is used in the co-registration procedure supported by S1_coreg_TOPS.

OPTIONS

S1_poly_overlap can also be used to define the overlap areas between the adjacent sub-swaths of a burst SLC.

SEE ALSO
S1_coreg_TOPS, typedef_ISP.h, typedef_DIFF.h .