Simulation of level 1 with Formosat-2

Muret data set (Southwest France)	Muret data set (Southwest France)	Cestas data set (Southwest France)
These Images are simulations of VENµS level 1 products (click on image for full resolution), from FORMOSAT2 data sets. These data are orthorectified, registered, calibrated and converted to Top of atmosphere reflectance. Note the excellent registration between successive images. For each data set, the same color table is used for the whole time series.

Description of level 1 product

Product Content

The main feature of Venµs products is the repetitivity of observations; it is also the main driver of Venµs product definition. Since the basic use of Venµs data is done with multiple images at different dates, the basic level 1 products must be geometrically registered and radiometrically calibrated. As a result, the Venµs level 1 products will be equivalent to SPOT level 3 products (that do not follow the CEOS product level definitions).

The Venµs level 1 will thus provide:

Geolocated top of atmosphere reflectances (possibility to use a different geographic projection for each site, but only one per site), with a subpixel (objective 3m) multi-date registration.
A cloud mask at a fine resolution

The level 1 geometric resolution is 5 m.

Coarse algorithm description

The level 1 processing combines radiometric and geometric corrections as follows:

Click on each box for more information