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Lorma stone holland sentinel11/9/2023 ![]() The VV channels were used in the analysis, and upon visual inspection, the sensitivity of the vertical polarization to the backscatter over water and wetlands is evident, with very low returns on 15 August (indicating a very calm sea state and low winds) and very high returns on 27 August due to the high sea state and winds (4 hours following the landfall of the hurricane). The two images used in the change analysis are both collected from the same viewing geometry, ascending pass, 12 days apart (both by Sentinel 1A), using the dual pol configuration (VV, VH). Intensity Change Detection algorithm to derive absolute backscatter.Data stacking (to produce the composite RGB image (R: 20200815_VV, G: 20200827_VV, B: 20200827_VV) using image merging technology.Co-register images using PCI's automated super registration algorithms (a specific algorithm is available for SAR images, others are tailored to optical imagery).SAR Ingest (supports direct import and uses the state vectors provided through ESA to precisely position the images within 1-2 pixels).The analysis shown below was derived using the following algorithms: Processing steps are very straightforward in Geomatica for Sentinel-1 imagery, with options for complete automation using the Python API. The team is leveraging the deep code base which has been developed over the years to provide great efficiencies in processing SAR imagery. Gabriel works with a dedicated SAR team that is developing technology to transform raw satellite imagery into information products at scale that can more easily be used by a broader user base. I contacted one of our SAR data scientists, Gabriel Gosselin, to help with the interpretation of the images which were collected. Eastern time.Īt PCI Geomatics, we have developed SAR technology that stretches back several decades, and over the years have continually added more and more capability to process these types of images. As it turns out, Sentinel 1A collected an image just a few hours after the hurricane made landfall, at roughly 6.30 a.m. While the Sentinel-1 satellites (Sentinel 1A and 1B) are designed to collect standard coverages on fixed dates (repeat pass every 6 days typically using both satellites). Hurricane-force winds of up to 74 miles per hour (120 km/h) were reported, causing considerable damage to property and sadly also the loss of many lives. Hurricane Laura made landfall on the coast of Louisiana, southwest of Lafayette, USA, on 27 August at roughly 2 a.m.
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