John Potter @johnpotter@qoto.org

梁祝小提琴协奏曲 - 苏雅菁 （指挥：高伟春） Butterfly Lovers Violin Concerto - Su Yajing (conductor: Gao Weichun)

梁祝小提琴协奏曲。 作曲：何占豪、陈钢。 小提琴独奏：苏雅菁。 指挥：高伟春。 乐团演奏：新华保险交响乐团。 2012年演出。 The Butterfly Lovers Violin Concerto. Music composed by He Zhanhao and Chen Gang. Soloist: Su...

https://m.youtube.com/watch?v=Fkd7lKSgeWo

https://qoto.org/media/su5zlm9TZ-pD-ejfqWg

Image from #Cassini right before it enter's #Saturn 's atmosphere.

#astronomy #space #nasa #outerspace

Your mind will answer most questions if you learn to relax and wait for the answer.

― William S. Burroughs

Picturesque duck pond at Silent Valley

I've got a hobby-interest in remote sensing (satellite imagery). Over the past couple of days, I've been playing around with data from the ESA's Sentinel-1 mission. The ESA (being cool and European Union-y) makes most of the data from Sentinel series of satellites freely accessible to the public, and provides some decent software for processing and analysing the data.

Sentinel-1 is a synthetic aperture radar (SAR) satellite. I don't fully understand the physics behind SAR, but it's basically an active radar measurement of the ground track the satellite passes over. Different surfaces give different sorts of radar returns (measured as a change in polarisation), and so SAR can be used to classify different terrains (crops, forests, grasslands, rock, etc), like in the false-colour image of Flevoland I've attached. Resolution is moderate: for Sentinel-1, each pixel ends up being about 4x4 m on the ground.

I just want to thank all the amazing QOTO users new and old for joining us. We just reached 750 users!

🎉 🎉 🎉 🎉 🎉 🎉 🎉 🎉

You've made this community interesting, welcoming, loving, and inclusive to people of all identities and orientations. It is truly wonderful to see.

I also love all the scientific and technical knowledge everyone is sharing. I've learned so much from all of you since being here and look forward to the future.