The documents are returned sorted on relevance depending on order, proximity, frequency of terms.
Default search behavior
By default, all search terms are optional. It behaves like an OR logic. Objects that contain the more terms are rated higher in the results and will appear first in their type. For example, wiki forum will find:
- objects that include both terms
- objects that include the term wiki
- objects that include the term forum
Requiring terms
Add a plus sign ( + ) before a term to indicate that the term must appear in results. Example: +wiki forum will find objects containing at least wiki. Objects with both terms and many occurences of the terms will appear first.
Excluding terms
Add a minus sign ( - ) before a term to indicate that the term must not appear in the results. To reduce a term's value without completely excluding it, use a tilde. Example: -wiki forum will find objects that do not contain wiki but contain forum
Grouping terms
Use parenthesis ( ) to group terms into subexpressions. Example: +wiki +(forum blog) will find objects that contain wiki and forum or that contain wiki and blog in any order.
Finding phrases
Use double quotes ( " " ) around a phrase to find terms in the exact order, exactly as typed. Example: "Alex Bell" will not find Bell Alex or Alex G. Bell.
Using wildcards
Add an asterisk ( * ) after a term to find objects that include the root word. For example, run* will find:
- objects that include the term run
- objects that include the term runner
- objects that include the term running
Reducing a term's value
Add a tilde ( ~ ) before a term to reduce its value indicate to the ranking of the results. Objects that contain the term will appear lower than other objects (unlike the minus sign which will completely exclude a term). Example: +wiki ~forum will rate an object with only wiki higher that an object with wiki and forum.
Changing relevance value
Add a less than ( < ) or greater than ( > ) sign before a term to change the term's contribution to the overall relevance value assigned to a object. Example: +wiki +(>forum < blog) will find objects that contain wiki and forum or wiki and blog in any order. wiki forum will be rated higher.
Framing and Virtual Framing
All the information necessary to derive the geographic footprint of a product in SAFE format, should be preserved as suitable in the control book (algorithm) and in the manifest file (algorithm input/parametric data).
It would be useful to have a clear correlation between the corner coordinates of a product footprint and the time these corners correspond to. Therefore a convention shall be defined for the sequence of corner coordinates allowing to tie them to the acquisition times. As a guideline there shall be 4 corner coordinates for each frame (for the sake of simplicity, a small 4 corner frame has a clear spatio-temporal correlation as linear speed can be considered constant); the interpolation algorithm between 2 corners shall be defined both for the scanline direction as well as for the flight direction.
All stripline products should be subdivided into frames at metadata level (Virtual Framing). It is still to be defined how to address the metadata that require even more granularity (e.g. quarter frame for cloud coverage)
This would provide two major advantages for the product management:
- A better spatio-temporal information manipulation
- Product subsetting by SAFE SW toolset