Locate Creature (and other spell questions)

Under teleport it says:

But scrying takes 1 hour to cast and only lasts 1/min per level. It also only allows the scryer to see and hear within 10 feet around the person he's scrying on. So if I'm understanding this correctly:

1. A Wizard would need at least six scrolls of scrying to study carefully a target/location.

2. If the target was constantly moving, the Wizard would never be able to "study carefully" because the surroundings would constantly be changing. He would only ever get "Viewed Once" roll unless he's been where the target is and knows it.

Also, one last thing. It says, "You must have some clear idea of the location and layout of the destination."

This seems to leave a lot up to interpretation. Would scrying actually be able to give the location and layout of the destination? Knowing someone is in a wooded area doesn't seem to help very much at all - there are tons of wooded areas out there in the world. Or what if the person being scryed on is on a city street with tons of people around? Aside from a street and tons and tons of moving people, the scryer would know very little about the area - next nothing, I'd say.

So just how useful is scrying when it comes to helping a person teleport? It doesn't seem nearly as useful as I'd first thought.

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