I have read few papers to get through the process in GeoServer and still lost at it.
My current situation is, I have a hotspot analysis that is done in ArcMap.
How can I publish it to GeoServer?
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Save your heatmap as a GeoTiff (or other raster output) and then create a new GeoTiff datastore in GeoServer. You will then be prompted to publish a new layer from that store, click publish and fill in as much or as little metadata as you need. If necessary you can also style your raster using SLD.