boston_canopy: Boston tree canopy and heat index data.

Description

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

Arguments

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).