Use cases and visualization information

Hi group,

well, I'am trying to follow the AUP methodlogy (or at less some points of it) to develop an application.

What's the problem?? Basically the problem is I am a ***... newbie :( and my problem is I dont know how orient or affront the requirements analisys and use cases (user histories or something helpful).

The application is a GIS (Geographic Information System). It Must be able to select the source of data and represent it graphically as an image, points, lines, etc, dependyng on the style of each feature.
Aslo the application must be able to show information in a stack layer, where each data is a layer. It must bring the user the possibility to move layers up/down, show/hide, etc.

The question is: what are requirements and what not? what are use cases and what not?
Are the options of move up/down a layer a requirement? a use case?

I think I am merging requirements, use cases and final utilities for the user (for example: change colors or properties) but I need some light.

Any ideas will be appreciate. Thanks.

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Antonio Santiago Pérez
( email: santiago<<at>>grahi.upc.edu )
( www: http://www.grahi.upc.edu/santiago )
( www: http://asantiago.blogsite.org )
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GRAHI - Grup de Recerca Aplicada en Hidrometeorologia
Universitat Politècnica de Catalunya
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