System Requirement Document (SRD) - H-SAF

H -SAFSystem Requirement DocumentDoc. No: SAF/HSAF/SRD/2.1Issue: Version 2.1Date: 20/06/2008Page: 74/102SM-OBS-2Regional surface soil moisture byradar scatterometer135 min (potentially 35 min using theEARS service)SM-ASS-1Volumetric soil moisture (rootsregion) by scatterometerassimilation in NWP model36 h (due to the need to assimilate dataobserved in the 6-30 hours precedingstart of the operational run)SN-OBS-1Snow detection (snow mask) byVIS/IR radiometryFixed time of the day, product updatedto account for data available until 1 hbefore deliverySnowParametersSN-OBS-2SN-OBS-3Snow status (dry/wet) by MWradiometryEffective snow cover by VIS/IRradiometryFixed time of the day, product updatedto account for data available until 1 hbefore deliveryFixed time of the day, product updatedto account for data available until 1 hbefore deliverySN-OBS-4Snow water equivalent by MWradiometryFixed time of the day, product updatedto account for data available until 1 hbefore deliveryTable 16 Time limits in products generation/dissemination3.5 Portability RequirementsH-SAF does not fit compulsory portability requirements, for the reason that (as stated evenat proposal stage) each of the production centres will use as far as possible its ownSW/HW environment.Anyway, the compliance with standards acts as a desirable requirement in order toaccomplish to both credibility and updating capabilities; standard criteria shall be issued byengineering task (see Project Plan [AD 2]), to be applied, when the case, to all participantsin charge of products generation.SR-92010-POR-GEN Level O Component ALLDescriptionSystem software should be platform independent (by using open standardenvironment and/or tools)