Our methodology tracks real-time and historical satellite imagery of 6,000+ datacenters. Contact sales@semianalysis.com to get access to the full granularity.
【方法】作者提到使用卫星影像跟踪6,000多个数据中心的方法，这是一种创新的数据收集和分析方法，超越了传统的公开报告和新闻分析。这种方法提供了近乎实时的建设活动监测能力，使他们的分析能够基于实际观察而非推测，增强了研究的可信度和时效性。
Wallis, C. (n.d.). COVID Has Pushed Medical Research into Remote Trials, Benefiting Patients and Scientists. Scientific American. https://doi.org/10.1038/scientificamerican0521-24
Explore the reach of scientific research in policy
Stathoulopoulos, K. (2020, March 17). Orion: An open-source tool for the science of science. Medium. https://medium.com/@kstathou/orion-an-open-source-tool-for-the-science-of-science-4259935f91d4
Negative values included when assessing air quality In computing average pollutant concentrations, EPA includes recorded values that are below zero. EPA advised that this is consistent with NEPM AAQ procedures. Logically, however, the lowest possible value for air pollutant concentrations is zero. Either it is present, even if in very small amounts, or it is not. Negative values are an artefact of the measurement and recording process. Leaving negative values in the data introduces a negative bias, which potentially under represents actual concentrations of pollutants. We noted a considerable number of negative values recorded. For example, in 2016, negative values comprised 5.3 per cent of recorded hourly PM2.5 values, and 1.3 per cent of hourly PM10 values. When we excluded negative values from the calculation of one‐day averages, there were five more exceedance days for PM2.5 and one more for PM10 during 2016.