Calculating impervious surface?

[nasch]

Is there a way to calculate percent impervious surface cover of an image area using snap?

[ABraun]

I’d use Sentinel 2 data and the spectral unmixing module.

Weird result from the Spectral Unmixing of a Sentinel2

Good morning everyone, I am here to ask an opinion about a weird result I obtained from the spectral unmixing of a Sentinel2 image. I have already worked with SMA on Sentinels, but this is the very first time something like this happens. I selected three spectral signatures from the image (one for vegetation, one for soil and one for water). I then launched the SMA, a Fully Contrained done with all the three spectral signatures. The output gave me three bands, one for each spectral signature…

Spectral unmixing in SNAP

Hello, I’ve tried to load a .TIF file containing raster data of all Sentinel-2 bands as source product in the Spectral Unmixing tool in SNAP. I’ve created this .TIF file in Arcmap. However, the program does not seem to read the file correctly as the names of the different bands do not appear in the ‘Parameters: spectral source bands’ window. I cannot find any further documentation on what the source product should consist of/ look like? [image]

Classification based on spectral library

There is no real spectral library in SNAP. But if you want to classify something you can have a look at this thread: Maybe this brings you already a bit further. Another options is the spectral unmixing. This result can be further used to classify the image. The endmembers needed for the spectral unmixing can be defined by setting pins and exporting them by using the Spectrum View. You should give names to the pins like water or forest before exporting them.