In Canada what is the difference between a search warrant and a general warrant?

A search warrant allows police to search for property and seize specific property, at a specific time, for a specific reason; In Canada a "General Warrant" allows the police to use a particular technique or method, (that without Judicial authority would be considered a breach of the persons rights) to obtain information relating to an offense. An example of a General Warrant would be: Authorization for the police to conduct a perimeter search of a property to look for signs of say a marijuana grow operation (condensation, smell etc) These observations can not be physically seized (They are observations and not property) and therefore a search warrant is not applicable.