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coordinates system, projection and data frame

francescarusso

Hi all,

I am writing to ask some help/clarifications about data frame, coordinates and projections.

I do not use GIS very often and I have a big gap in cartography.

I use ArcMap 10.2 Desktop

someone sent me a layers package. I imported the layers into a new empty document.

The data frame now gets the layer's proj. coordinate system and projection.

-1) some layer in the layers pack have BRITISH NATIONAL Grid coord system and Projection:Transv.Mercator and other layers have GCS WGS84 Datum D_WGS84. Shall I have to change anything? Are they correct or because they have different coord system I will have problem (i.e doing some measurement or analysis?)

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Coordinate Reference Systems

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