PPE Filtering Processor |

## User Interface

PPE Filtering can be invoked from the menu by selecting Optical -> Preprocessing -> OLCI PPE Filtering.

#### Source Product Group

Source product: Here the user specifies the source product reflectance. The combo box presents a list of all products opened in the application. The user may select one of these or, by clicking on the button next to the combo box, choose a product from the file system.

#### Target Product Group

Name: to specify the name of the target product.
Save as: checkbox to specify whether the target product should be saved to the file system. The combo box presents a list of available file formats. The text field or the button next to it allow to specify a target directory.
Open in SNAP: Used to specify whether the target product should be opened in the application. When the target product is not saved, it is opened automatically.

#### Processing Parameters Panel

Filtering cut-off:
Pixel will be filtered if it deviates from its neighbors median by more than this number. Default value=0.7

Number of MAD:
Pixel will be filtered if it deviates from its neighbors median by more than this number times Median Absolute Deviation. Default value=10

Valid pixel expression:
This expression is uses for validating pixels which will be considerd for processing, if the user did not add any expression only the water pixels will be filtered. If the expression is set to TRUE, then all pixels are considered to be valid. The button can be use in creating a valid express.