For those (like me) who have been wondering if there's been a plane flying back and forth over Harringay today, the answer is yes - apparently it's an Ordnance Survey plane:
https://twitter.com/joe_crowley/status/1254371681893847041/photo/1
Looks like it's still doing circuits, although now a bit further to the east:
Tags (All lower case. Use " " for multiple word tags):
Actually, further down that tweet thread an Ordnance survey person says it is not them.
There's a suggestion it could be someone like Google...".The narrow strips suggest a high overlap which is better for a 3D image.Other reasons could be LiDAR used by EA etc.If spotted on a cold noght could be thermal surveys.Used by police for detecting illegal 'farms' in roof space ..and LA for roof insulation"
Here's a discussion from 2016 on this topic, though no absolute conclusion was reached:
https://www.harringayonline.com/forum/topics/spy-plane-over-london-...
A couple of the links in there lead to companies that do flight surveys on contract, including checking that airport radar systems are correctly calibrated, hence the repeated narrowly-spaced parallel passes.
Given that the flight path goes up & down the East Coast mainline, it could be Network Rail or a contractor - e.g. preparing for the new digital signalling system - https://www.railtech.com/infrastructure/2020/03/27/digital-transfor...
So this has been happening all throught the "lockdown".
This from April 5
https://twitter.com/seismo_steve/status/1246776374364422144?s=20
This from 12 April 2020
https://twitter.com/icey_mark/status/1249337440604753920?s=20
This from last sunday 26 April
https://twitter.com/icey_mark/status/1254389788272201728?s=20
I wondered if it was something like google with a LIDAR sensor for 3d mapping the buildings? (LIDAR = https://en.wikipedia.org/wiki/Lidar)
With those sensors you could actually map the tree canopy development during the spring as well. I'm going to keep looking...
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