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天文学家推动关于巨型卫星星座的全球辩论

如果公司和政府公开宣布建立和发射所有的网络，或称巨型卫星星座，那么在未来几年，地球轨道上可能会增加数万颗卫星，以提供宽带互联网。其数量之多，可能意味着整夜都能看到数百个，对天空的影响是人类历史上前所未有的。意大利帕多瓦大学的天文学家、国际天文学联盟（IAU）的前秘书长皮耶罗-本维努蒂说：“这些星座正在极大地改变太空的使用方式。”
他和其他天文学家一直在通过国际天文学联盟工作，以提高国际社会对巨型卫星星座如何影响科学家和公众的认识。他们说，目标不是让天文学家与卫星公司对立，而是为如何公平使用外层空间的共享领域制定一个愿景。NOIRLab的天文学家康尼-沃克说：共识必须来自所有国家。 NOIRLab是一个由美国资助的几个观测站的伞式组织。科学家们在7月12日至16日举行的名为SATCON2的卫星星 ....

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A Handy Introduction to Cloud Optimized GeoTIFFs

Since I started working at Planet, I kept hearing about Cloud Optimized GeoTIFFs (COGs). My colleague Chris Holmes even wrote a post explaining what they are and how they’re useful. I decided to implement a Go library to be able to work with COGs. Much of Planet’s satellite imagery is in the GeoTIFF format, including this nice image of Los Angeles from our February 2018 Global Basemap:
An image of Los Angeles from Planet’s February 2018 Basemap. ©2018 Planet Labs Inc, CC BY-SA 4.0.
As a first step to writing a library, I needed to learn about 1) Cloud Optimized GeoTIFFs, 2) GeoTIFFs in general, and 3) even more general than that: TIFFs. I’ve always found binary file formats intimidating they just look like gibberish when you dump them into the console! But there’s logic in that gibberish. Here’s what you can gain from my exploration of this 30-year-old file format. ....

Frank Warmerdam , Dana Bauer , Ifds Ian Hansen , Chris Holmes , Joe Kington , Patrick Armstrong , Los Angeles , Sian Hansen , Developer Center , Handy Introduction , Cloud Optimized , Image File Format , Tag Image File Format , Image File , Image File Directory , Aware Systems , Unsigned Long , Tag Data , Tag Datatype , What Makes , Image Data , Without Any , டானா பாயர் , கிறிஸ் ஹோம்ஸ் , பேட்ரிக் ஆம்ஸ்ட்ராங் , லாஸ் ஏஞ்சல்ஸ் ,