Calculating area from satellite images

[bairgon]

Given an image like http://ocean.dmi.dk/arctic/images/MODIS/Lincoln/201612191227.NOAA.jpg how can I calculate the area of the Lincoln Sea "polynya"?

There are Sentinel images like http://ocean.dmi.dk/arctic/images/MODIS/Lincoln/20161220s01a.ASAR.jpg with lat/long, but these don't cover the complete area to be calculated.

As an alternative, can the images be accessed using Google Earth or similar, with polygon drawing tools? I tried importing an image as an overlay but found it difficult to match it up.

[Tealight]

If you want to calculate area from images you need to know the exact resolution. The rest is pixel counting.

I do most of my area calculations and length meaurements with SNAP. It has a polygon drawing tool and can directly tell me length measurements of satellite images with geo information.


http://step.esa.int/main/download/

[bairgon]

Thanks for that hint. Downloading now.