But archived SAR images from past missions can be freely obtained.
In the next figure Sentinel-1 subsets from before and during the flood event as well as the Recommended Practies and EMS flood masks are shown in detail. Data preparation 0. SNAP will open the product with all metadata relevant to the subset.
Sentinel 1 - SAR Dataset. The band math utility allows one to make any sorts of mathematical and logical expressions on the bands available in the product.
In the bottom left corner, the WorldWind View shows the footprint of the selected scene. The histogram will show one or more peaks of different magnitude depending on the data. Then a search option becomes available which can be used to specify the data need such as region of interest, product type, sensor mode, sensing period, among others.
The footprint of the subset is also shown in the WorldWind View. Related Practices Recommended Practice: By right clicking on the Product, Properties can be opened which include information on mission, acquisition date, pass, etc.
Recommended Practice Flood Mapping http: Post-processing - Geometric correction. Low values of the backscatter will correspond to the water, and high values will correspond to the non-water class.
Pre-processing - Calibration 1. This includes: Other SAR imagery is not freely available; these include: Recommended Practice Flood Mapping up. Apart from that and some river structures, there is an overall concordance between both flood masks.