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Tree canopy and summer surface temperature

Abstract

Urban surface temperatures vary sharply over short distances, and tree canopy is one of the few factors a city can change. We combine satellite thermal imagery with street-level canopy surveys across 214 neighbourhoods over six summers.

Same six-summer window as our dataset

城市地表温度在很短的距离内就会出现明显差异，而树冠是城市少数能够改变的因素之一。我们将卫星热成像与街道层面的树冠调查相结合，覆盖 214 个街区、六个夏季。

Each ten-point increase in canopy cover is associated with a 1.3 °C drop in afternoon surface temperature. The effect is strongest in dense districts and weakens where more than half the ground is already unpaved. Because the design is observational, we cannot rule out that cooler neighbourhoods were simply easier to plant.

树冠覆盖率每提高十个百分点，午后地表温度约下降 1.3 °C。这一效应在建筑密集的街区最为明显，而在一半以上地面尚未硬化的地方则有所减弱。由于研究设计属于观察性质，我们无法排除较凉爽的街区本来就更容易种树的可能。

Assistant

What did they find, and how solid is it?

More canopy goes with cooler streets: about 1.3 °C for every ten points of cover.

The link is strongest in dense districts.

The evidence is correlational, so the authors stop short of a causal claim.

Every statement cites a sentence. Select a number to see it in the paper.

Built around how you actually read

Most tools treat a document as a file to store. Researchable treats it as text to read, question and reuse.

Any PDF or Word file, re-typeset to be read

Upload a document and Researchable rebuilds it as one clean column that fits your screen. Figures, equations and references stay where they belong.

paper.pdf

Tree canopy and summer surface temperature

1 Introduction

Urban surface temperatures vary sharply over short distances, and tree canopy is one of the few factors a city can change.

Figure 1

A translation under every paragraph

Each paragraph is followed by its translation, so you read in your own language with the original one glance away. Switch languages whenever you like.

Each ten-point increase in canopy cover is associated with a 1.3 °C drop in afternoon surface temperature. The effect is strongest in dense districts and weakens where more than half the ground is already unpaved.

树冠覆盖率每提高十个百分点，午后地表温度约下降 1.3 °C。这一效应在建筑密集的街区最为明显，而在一半以上地面尚未硬化的地方则有所减弱。

Click a sentence to highlight it

No dragging across broken PDF text. Click a sentence, or select your own range, then highlight it and write a note right there.

We combine satellite thermal imagery with street-level canopy surveys across 214 neighbourhoods over six summers. Each ten-point increase in canopy cover is associated with a 1.3 °C drop in afternoon surface temperature. Because the design is observational, we cannot rule out that cooler neighbourhoods were simply easier to plant.

Compare with the estimate in chapter 3

Try it: click any sentence.

Find the sentence you half remember

You want to cite something from your library but only recall the gist. Describe it in your own words and get the exact sentence, with its source.

that paper saying trees cool dense areas the most

Found in your library

The effect is strongest in dense districts and weakens where more than half the ground is already unpaved.

Tree canopy and summer surface temperature

Cite this sentence

An AI assistant that shows its sources

Ask from the sidebar while you read. Every conclusion links to the exact sentence it came from, so checking an answer takes one click.

Assistant

Canopy cools streets by about 1.3 °C per ten points of cover.

The authors do not claim the trees cause the cooling.

Source · sentence 3

Each ten-point increase in canopy cover is associated with a 1.3 °C drop in afternoon surface temperature.

And everything around the reading

What you highlight becomes what you write, without leaving the workspace.

Notes that link to each other

Notes link to one another and back to the sentence they were written against, so your reading builds into something you can navigate.

Canopy and cooling

Slope is about −1.3 °C per ten points of cover. Stronger in dense districts, so check it against Street width before using it in Chapter 3 draft.

From · Tree canopy and summer surface temperature

Each ten-point increase in canopy cover is associated with a 1.3 °C drop in afternoon surface temperature.

Linked from 2 notes

  • Urban heat: what actually works
  • Open questions for the methods section

LaTeX writing, next to your sources

Write in LaTeX with a live preview. Cite from your library and the bibliography builds itself.

main.tex

\section{Results}
Canopy cover is associated with lower afternoon surface temperature~\cite{canopy2025}, with a slope of $-1.3\,^{\circ}\mathrm{C}$ per ten points of cover.

Preview

2 Results

Canopy cover is associated with lower afternoon surface temperature [1], with a slope of −1.3 °C per ten points of cover.

[1] Tree canopy and summer surface temperature.

Reference library
Collections, tags, metadata and citations in one place, so the file, your notes and the bibliography entry never drift apart.
Daily paper recommendations
A short reading list each morning, picked from what you already collect and annotate, with the reason each paper made the cut.
Reading aids for ADHDIn design
We are designing a reading mode for people who lose their place in long, dense papers. Early-access members will help shape it.

Made for the work around reading

Four jobs Researchable is built for. The same tools serve all of them, because each one depends on reading long documents closely.

Get through forty papers and still know what each one said

A review means reading more than you can hold in your head. By the time you write, the key finding from paper twelve is a highlight you can no longer find.

Ask the assistant

Which of these papers measured the effect directly, and what did they find?

What you'd use

AI assistant
Ask across the papers you are reading. Every claim in the answer links to its sentence.
Highlights and notes
Click a sentence to keep it. Your notes stay attached to the exact place they came from.
Reflowed reading
Every paper in the same clean layout, whatever the journal did to the PDF.
Reference library
Collections, tags and metadata for everything you have read.

Read the original, with your own language underneath

Most research is published in English. Reading it in a second language is slower, and pasting paragraphs into a translator loses your place and the formatting with it.

Ask the assistant

What does this sentence mean, in plainer words?

What you'd use

Translation
Each paragraph is followed by its translation, so the original is always one glance away.
Reflowed reading
One readable column instead of two cramped ones, with figures and equations kept in place.
AI assistant
Ask about a term or a sentence and get an answer tied to the original text.
Highlights and notes
Annotate the original or the translation. Notes follow the sentence in both.

Find the sentence you remember, and cite it properly

You know you read it somewhere in your library: a claim, a number, a way of putting it. You remember the idea, but not the words, the paper or the page.

Search your library

that paper saying trees cool dense neighbourhoods the most

What you'd use

Search by meaning
Describe the idea in your own words and get the exact sentence, with its source.
Linked notes
Your reading notes, connected to each other and to the sentences behind them.
LaTeX writing
Draft next to your sources with a live preview.
Reference library
Cite from your collections and the bibliography builds itself.

Find the paragraph that matters in a 200-page report

Annual reports, filings and policy papers bury the detail you need, and a summary is only useful if you can show where it came from.

Ask the assistant

Where does management explain the change in gross margin this year?

What you'd use

AI assistant
Ask a question of the whole document and check each claim against its sentence.
Search by meaning
Search for an idea, such as pricing pressure, however the authors phrased it.
Reflowed reading
PDF and Word reports re-typeset into pages you can read on any screen.
Highlights and notes
Keep your reasoning attached to the passages that support it.

Questions, answered

Researchable is a workspace for reading, understanding and writing about long documents, from research papers to reports. Upload a PDF or Word file and it is re-typeset into a clean page with a translation under each paragraph, sentence-level highlights and notes, semantic search and an AI assistant that cites its sources. A reference library, linked notes and LaTeX writing are built in.

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