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How to display a Custom Profile from a layer?

Open a visualization Layer portlet (refer to How to visualize a layer?) of a raster data.

Click on the cog button at the upper right of the portlet and click on Get custom Profile.

You can now draw a two-points line on the map. The Custom Profile service will get every pixel values underneath of the line you have drawn.

You can find the custom profile chart at the bottom of the portlet. If you put your cursor on the line you can get interactively the according pixel value. You have as well the possibility to save the chart as a png thanks to the toolbar at the top of the chart.