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Show HN: Helios – what plug-in solar could generate for any address in Britain (helios.southlondonscientific.com)
ltrg 27 minutes ago [-]
Really cool stuff. Nitpick: it failed to grab an OSM ID for my house and fell back to postcode centroid, but then still reported LIDAR-derived shading at quite high precision.

I'm wondering if it should fall back to a more general shading approach when no OSM building footprint is available, to avoid false precision? My street has a gap in the houses on the other side from mine, so picking the right location matters for the calculation.

You could also try Inspire Index polygons instead of OSM? These correspond to actual lease/freehold boundaries.

ruaraidh 24 minutes ago [-]
Thanks - I didn't know about Inspire Index, I'll check it out. I tend to agree about false precision. My first instinct was to use the synthetic horizon for addresses in that group, but I think that's over positive. A range might be better (if a bit more complex)?
redfloatplane 1 hours ago [-]
Huh, TIL about the National LIDAR Programme: https://www.data.gov.uk/dataset/f0db0249-f17b-4036-9e65-3091...

Very interesting stuff and quite a large undertaking! I'm often impressed by the quality of the UK's open data.

kilroy123 50 minutes ago [-]
I noticed this as well! Very interesting.
GordonS 1 hours ago [-]
This is really nice! Would be great if it could handle regular rooftop solar calculations too.
ruaraidh 1 hours ago [-]
Thanks! Should be doable, I just got excited by the new shiny thing first.
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