...
The general format of such a URL is:
...
{{ IdP_SingleSignOnService
...
_Location
...
?}}
{{ shire=SP_AssertionConsumerService_Location\&}}
{{ target=SP_Entry_Point\&}}
{{ providerID=SP_EntityDescriptor_entityID}}
The four query string parameters here are taken from the InCommon metadata for the SP being invoked, as well as the campus's IdP:
...