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I have a raster in PostGIS which I need to query pixel values from, but only within a specific area. So I have a GeoJSON polygon within which I want to extract min/max/avg values of the raster from.

The raster is divided into 640 rid's as well, due to pretiling. How can I combine the values?

So, how can I do this?

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    I would start by converting the GeoJSON to a geometry. Afaik, tiling will have no impact, assuming it is all one logical raster, other than speeding it up. Commented May 11, 2016 at 19:07

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