A dataset containing data on tree canopy coverage and change for the city of Boston, Massachusetts from 2014-2019, as well as temperature and heat index data for July 2019. Data is aggregated to a grid of regular 25 hectare hexagons, clipped to city boundaries. This data is made available under the Public Domain Dedication and License v1.0 whose full text can be found at: https://opendatacommons.org/licenses/pddl/1-0/.

## Usage

boston_canopy

## Format

A data frame (of class sf, tbl_df, tbl, and data.frame) containing 682 records of 22 variables:

grid_id

Unique identifier for each hexagon. Letters represent the hexagon's X position in the grid (ordered West to East), while numbers represent the Y position (ordered North to South).

land_area

Area excluding water bodies

canopy_gain

Area of canopy gain between the two years

canopy_loss

Area of canopy loss between the two years

canopy_no_change

Area of no canopy change between the two years

canopy_area_2014

2014 total canopy area (baseline)

canopy_area_2019

2019 total canopy area

change_canopy_area

The change in area of tree canopy between the two years

change_canopy_percentage

Relative change calculation used in economics is the gain or loss of tree canopy relative to the earlier time period: (2019 Canopy-2014 Canopy)/(2014 Canopy)

canopy_percentage_2014

2014 canopy percentage

canopy_percentage_2019

2019 canopy percentage

change_canopy_absolute

Absolute change. Magnitude of change in percent tree canopy from 2014 to 2019 (% 2019 Canopy - % 2014 Canopy)

mean_temp_morning

Mean temperature for July 2019 from 6am - 7am

mean_temp_evening

Mean temperature for July 2019 from 7pm - 8pm

mean_temp

Mean temperature for July 2019 from 6am - 7am, 3pm - 4pm, and 7pm - 8pm (combined)

mean_heat_index_morning

Mean heat index for July 2019 from 6am - 7am

mean_heat_index_evening

Mean heat index for July 2019 from 7pm - 8pm

mean_heat_index

Mean heat index for July 2019 from 6am - 7am, 3pm - 4pm, and 7pm - 8pm (combined)

geometry

Geometry of each hexagon, encoded using EPSG:2249 as a coordinate reference system (NAD83 / Massachusetts Mainland (ftUS)). Note that the linear units of this CRS are in US feet.

## Details

Note that this dataset is in the EPSG:2249 (NAD83 / Massachusetts Mainland (ftUS)) coordinate reference system (CRS), which may not be installed by default on your computer. Before working with boston_canopy, run:

• sf::sf_proj_network(TRUE) to install the CRS itself

• sf::sf_add_proj_units() to add US customary units to your units database

These steps only need to be taken once per computer (or per PROJ installation).