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slcp2cod

This repository contains jobs to convert S1-SLCP products to Coherence Differences (CODs) for creating Damage Proxy Maps v1 (DPMv1).

A COD is created based on the below pairing system, using 3 SLCs --> 2 SLCPs --> 1 COD: 

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Associated job:

Job 1: S1 COD - Network Selection

This job does network selection / pairing of pre-event SLCPs with the co-event SLCP in the specified AOI to submit to the S1 COD job (Job 2 below) to create CODs

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• Important outputs:

  • No products will be directly generated, only S1-COD jobs will be submitted based on pairing results. (Expect 1 job for each subswath)

• Notes:

  • The COD network selector pairs SLCPs to submit to the S1-COD job based on the following workflow:

    1. Gather pre-event_SLCPs + co-event_SLCPs from GRQ. Search criteria:

       1. SLCPs are pre-event if SLCP_end_time < AOI_event_time

       2. SLCPs are co-event if SLCP_start_time < AOI_event_time < SLCP_end_time

    2. Match pre-event_SLCP and co-event_SLCP pairs if:

       1. pre-event_SLCP[‘master_time’] - co-event_SLCP[‘master_time’] < 1 day

       2. area_intersect(pre-event_SLCP,co-event_SLCP) / area(co-event_SLCP) > min_overlap

    3. Creates and returns minmatch or valid SLCP pairs for COD based on shortest temporal baseline, where

       • temporal baseline = co-event_SLC['slave_time'] - pre-event_SLCP['slave_time']

  • Hence, if there are multiple pre-event SLCPs as per the following: 

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      • If minmatch = 1, only COD 1's job will be submitted

      • If minmatch = 2, both COD 2 and COD 1 will be submitted

Job 2: S1 COD

• Type: Individual

• Facet: Not needed

• User inputs:

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• Notes:

  • The CODs in this PGE are computed as such (from burst_coherence_diff.py):

    • Image RemovedImage Added

  where COR = Coherence of given co-registered SLCP

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