I have a GeoJSON file which consists of rainfall data in a location.
I want to interpolate those point data in GeoJSON and make a raster file, and display in Leaflet map. How can I do this?
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You can use QGIS then interpolate with the existing processing tools. Here is an example:
You could then convert your map to a website using QGIS2Web plygin in either Leaflet, OpenLayers or Mapbox preserving your GeoJSON layer. You do not have to convert it to a raster, even though you could.
However, be informed that if your layer is too bog that would affect the web performance.