GSC Sentinel-2 PDGS SRD - emits - ESA

GSC Sentinel-2 PDGS SRD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-RD-09-0028
page 189 of 204
APPENDIX-A PDGS REQUIREMENTS SEMANTIC AND
FORMAT
The PDGS requirements are presented through the following convention:
Requirement Identifier under the form S2-PDGS-FFF-NNN, where
FFF is a sub-class of requirements (e.g. the function Acronym);
NNN is a three digits progressive number inside each sub-class.
Requirement Description: Free text
The following language definitions are used to specify a GMES Sentinel-2 PDGS
requirement:
SHALL is used to indicate a mandatory requirement
SHOULD indicate a preferred alternative, but it is not mandatory
MAY indicate an option
WILL indicates a statement of fact or intention
The verification method by TEST shall be preferred, unless one of the other methods can
be established at acceptable level of confidence while being cost and schedule effective.
The requirements are organized in different categories or classes according to the
following table.
Requirement Category / Class
Description
This requirement class describe WHAT the PDGS shall
perform to satisfy its objectives.
Functional
In this sense the functional requirements capture the
intended behaviour of the PDGS system. This behaviour
may be expressed as services, tasks or functions the
system is required to perform
Performance
This requirement class describe those PDGS
requirements that typically quantify the operational value
of other (functional) requirements. Performance
requirements are often a numeric value assigned to the
requirement, or even more typically have a relationship
between two or more requirements
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