help needed with WGS84 map

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05-08-2014 11:23 PM
BobbyLim
New Contributor
Hi,

I have a paper map that I am trying to digitize. I have scanned it and am trying to use ArcGIS to export the values and locations of the contour lines, but even before that, I have some trouble understanding the coordinate system used by this map.

On the map, it is stated that "Positions are referred to WGS84 datum" and immediately below that, "Projection: mercator". From my limited understanding of cartography, WGS84 is a geographic coordinate system (GCS), meaning that it is not a projection. So why is there a projection to this map?

Therefore, the next question is, which spatial reference system should I use for this map?

Appreciate any help here.

Thanks.
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michaelcollins1
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