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I have a dataset that contains X,Y coordinates of a glacier and the surface elevation is plotted as a Z-coordinate (see attachment).

What I want to do is connect the top with the bottom of the glacier by a line, that goes perpendicular to the contours (a flowline). Does anyone know how this can be done? I thus want to create a transect (line) perpendicular to the contourlines...

enter image description here

  • Can't you just draw it by hand? – Hornbydd Mar 28 '17 at 21:22
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Any flow direction line will be perpendicular to the contours. A simple but manual solution would be to create a Triangulated Irregular Network (TIN) from the points. Use the TIN as the surface model in the 3D Analyst toolbar and use the Create Steepest Path tool to create your line. A more involved solution would be to convert the points to a raster surface and use the hydrology tools in the spatial analyst toolbox to determine 'flow direction' for the surface of your glacier.

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