I'm an extreme novice to GIS.

I'm using ArcGIS (Arcmap) and basically I've got 5 bathymetry layers, and I'm just wondering how to group them into one. Which would allow them to be represented with graduated colour with association to depth, rather than each having a single colour.

  • Are your bathymetry layers contour lines, point depths, or something else?
    – PolyGeo
    Dec 6, 2015 at 12:17
  • They're polygons, with each having a discrete value of; 0, 200, 1000, 2000, 3000.
    – J.Duke
    Dec 6, 2015 at 12:20
  • 1
    Please edit your question to revise it with any requested clarifications like this.
    – PolyGeo
    Dec 6, 2015 at 19:43

1 Answer 1


There is a tool called Topo To Raster (http://resources.arcgis.com/en/help/main/10.2/index.html#/Topo_to_Raster/00q90000000s000000/), you can generate a raster from contours. If you want to do this, you would first need to merge all your layers, just search for the merge tool in the arctoolbox. Here you can find similar solutions: http://kb.mit.edu/confluence/pages/viewpage.action?pageId=11337908

  • 1
    Brilliant, the merging tool worked perfection! Thankyou all
    – J.Duke
    Dec 6, 2015 at 12:43
  • Glad to help you, please mark it as the answer if you find it useful =)
    – Gery
    Dec 6, 2015 at 20:22

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