The Sentinel-1 layer grants you access to ESA's high resolution near-real time synthetic aperture radar (SAR) satellite images. With some experience, on SAR images you can directly identify sea-ice structures such as individual ice floes or open cracks and ridges within a closed ice cover. For the Svalbard area Sentinel-1 images are provided approximately daily 1 to 8 hours after satellite recording. For high-resolution images, one image pixel is 30x30m; for low-resolution images, one image pixel is 300mx300m.
One needs experience and practice to interpret SAR images. Sometimes it is extremely difficult even for an expert ice analyst to identify ice features on SAR images unambiguously. Here are some fundamental guidelines which always have their exceptions: