4. Software Installation

4.1. Overview

This chapter describes the overall S3-SNOW software installation procedure.

4.2. Usage Requirements

4.2.1. General Requirements

The S3-SNOW and SICE processors require SNAP in the latest release version (v7.0.0), which is available for all platforms (Windows, Linux, MacOS) from the SNAP website (step.esa.int).

4.2.2. Operating System

The S3-SNOW software can be run on any operating system which is suppported by SNAP (Windows, Linux, MacOS).

4.2.3. Hardware Requirements

The S3-SNOW / SICE processing system is a complex piece of software. Although the algorithms for the snow properties retrieval are mostly relatively simple, the effort for data input/output is fairly high in case of full resolution OLCI products. Therefore, up-to-date and sufficiently powerful and dimensioned hardware is strongly recommended for reliable and convenient processing.

4.3. Contents of the S3-SNOW / SICE Processing Software Bundle

The S3-SNOW / SICE processing software consists of the following components:

  • s3tbx-snow-3.0.nbm: nbm plugin file
  • snap-slope-1.0.nbm: nbm plugin file
  • GIMP Digital Elevation Model for Greenland: GeoTIFF auxiliary file

Processors for Rayleigh correction and for IdePix pixel classification are included in the SNAP software. The Rayleigh correction processor is installed automatically as part of the SNAP installation, the IdePix processor for OLCI needs to be installed from the plugin manager in SNAP Desktop (described in more detail below).

4.4. How to get the Software

The S3-SNOW processing software bundle can be obtained from the S3-SNOW ftp site hosted at BC with the following configuration:

  • FTP, Port 21
  • ftp.brockmann-consult.de
  • username: s3snow
  • password: $3Sn0W@bc
  • subdirectory: software

4.5. Installation Steps

4.5.1. Installation of the SNAP Software

Download SNAP (Unix version) from the SNAP web site [4] and follow the information and instructions for installation given there.

4.5.2. Installation of the S3-SNOW Processor modules

Once SNAP has been installed, the installation of all NBM plugin files needs to be done from the ‘Plugins’ toolwindow in the SNAP Desktop application. This is illustrated in the figure sequence Figure 4.1 to Figure 4.4.

_images/plugins_in_tools_menu.png

Figure 4.1 The SNAP menu entry for installation of plugins.

_images/add_plugins.png

Figure 4.2 Selection of plugins to be installed. (Note that the IdePix OLCI plugin is shipped with SNAP and is listed under ‘Available Plugins’, whereas the plugin for S3-SNOW / SICE needs to be accessed through the ‘Download’ tab from the local disk after download from S3-SNOW ftp site. Also note that the ‘IdePix core’ plugin needs to be installed in addition to the ‘IdePix OLCI’.)

_images/add_plugins_confirm.png

Figure 4.3 Confirmation of selected plugins (step 1 of 4).

_images/add_plugins_confirm_restart.png

Figure 4.4 Final confirmation for restart after selection of plugins.

After restart of SNAP, the installed processors will be available from their dedicated menu entries. This will be shown in more detail in the next chapter.