I just happened to be looking through MapRoulette challenges and found the one on converting nodes to areas (not sure how to link to that here).
One issue I realised on looking at it is that in Extremadura, Spain there are many heliostat mounted solar pv panels. In particular the concentration of solar farms around Almaraz are nearly all like this (mapillary). I know of these because I first noticed them in Feb 2010. Almaraz has a nuclear power station and therefore the area already had excellent grid connectivity.
Unfortunately someone has diligently converted all these to areas, which would be misleading for data purposes.
We need to work on a couple of issues in order to be able to capture data on such plants accurately:
- Agree on a tag to indicate that a relevant solar panel is mounted on a heliostat. Options I can think of are location=heliostat (consistent with existing tagging for roofs, reducing data consumption issues); support=heliostat (consistent with most widely-used tag for supporting structures); man_made=heliostat.
- Do something about the existing power=heliostat which refers to heliostat mounted mirrors in solar thermal stations (also common in Extremadura). Probably this should be refined to something like heliostatic_mirror to be more precise & remove confusion.
- Include stuff about such plants in any MapRoulette challenge rubric.
- Select a suitable tag for the whole solar farm to indicate that the panels are mounted on heliostats.
According to Spanish Wikipedia the individual panels at Almaraz are around 11kW, suggesting 44 modules at 250W/module. They look to have more solar modules (perhaps 4 rows of 14, giving 56) and as installation was prior to 2010 likely to generate less power. Other installations
Domestic heliostat mounted solar pv is also available: http://www.heliostaat.nl/