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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

1 School Chemistry — Grades 1 to 121–12 年级在线 2 University Chemistry — Year 1本科一年级在线 3 University Chemistry — Year 2本科二年级在线 4 University Chemistry — Year 3本科三年级在线

1 Primary & Middle School Biology1–9 年级在线 2 High School Biology10–12 年级在线 3 University Biology — Year 1本科一年级在线 4 University Biology — Year 2本科二年级在线 5 University Biology — Year 3本科三年级在线

1 Primary & Middle School Earth and Space Sciences1–9 年级在线 2 High School Earth and Space Sciences10–12 年级在线 3 University Earth and Space Sciences — Year 1本科一年级在线 4 University Earth and Space Sciences — Year 2本科二年级在线 5 University Earth and Space Sciences — Year 3本科三年级在线

1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Buffer; overlay？

又称： buffer (GIS) · overlay (GIS)

Definition 25.20 University Earth and Space Sciences — Year 3 · 第 25 章 — Remote Sensing and GIS

The buffer of a feature at the distance $d$ is the region of the map within $d$ of it. An overlay combines two or more layers of the same area into one, each place of the result carrying the attributes of all of them; the selection of the places that meet several conditions at once is the commonest use.

A GIS session on the Varden Hills, from their elevation model on a 100\, m grid. (a) The slope, up to 23 on the valley sides; (b) the aspect, the direction the ground faces, the two sides of the river facing each other; (c) two layers, the cells steeper than 15 and the outcrop of the Jurassic shale; (d) their overlay with the 1\, km buffer of the river (dashed): the 0.32\, km2 of steep shale above the river, a first screen for ground that may slide. — A GIS session on the Varden Hills, from their elevation model on a $100\,\mathrm{m}$ grid. (a) The slope, up to $23{}^{\circ}$ on the valley sides; (b) the aspect, the direction the ground faces, the two sides of the river facing each other; (c) two layers, the cells steeper than $15{}^{\circ}$ and the outcrop of the Jurassic shale; (d) their overlay with the $1\,\mathrm{km}$ buffer of the river (dashed): the $0.32\,\mathrm{km}^{2}$ of steep shale above the river, a first screen for ground that may slide.

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