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/.
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.
Source
Canopy data is from https://data.boston.gov/dataset/hex-tree-canopy-change-metrics. Heat data is from https://data.boston.gov/dataset/hex-mean-heat-index. Most field definitions are from https://data.boston.gov/dataset/canopy-change-assessment-data-dictionary.
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 itselfsf::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).