Package 'CAOP.RAA.2024'

Azorean boundary segments

Description

boundary_segments() returns the boundary segments that separate administrative entities or borders with the Atlantic Ocean in the Azores.

boundary_segments_25N() returns the boundary segments in the meter-based projection PTRA08 / UTM zone 25N, i.e. those boundary segments in the western-most part of the archipelago: Ilha das Flores and Ilha do Corvo.

boundary_segments_26N() returns the boundary segments in the meter-based projection PTRA08 / UTM zone 26N, i.e. those boundary segments in the Central and Eastern groups of the archipelago.

Usage

boundary_segments(crs = laea_azores_proj())

boundary_segments_25N()

boundary_segments_26N()

Arguments

crs	Coordinate reference system (CRS) passed on to st_transform(). Defaults to a custom CRS centered on the Azores, see laea_azores_proj() for more details. Other possible options are "EPSG: 3035" for ETRS89-extended / LAEA Europe or "EPSG:4326" for WGS 84.

Value

A simple features (sf) object with seven fields:

id

An unique UUID identifier for the segment.

id_at_right

Identifier for the entity at the right side of the boundary.

id_at_left

Identifier for the entity at the left side of the boundary.

is_confirmed

Boundary segment whose acceptance by the parties has not yet been officially communicated.

boundary_type

Boundary type: land or coast.

boundary_level

Boundary level: administrative level.

length

Boundary segment length in kilometers.

Examples

boundary_segments()
boundary_segments_25N()
boundary_segments_26N()

---

Azorean districts

Description

districts() returns the boundaries of districts (islands) in the Azores.

districts_25N() returns the districts in the meter-based projection PTRA08 / UTM zone 25N, i.e. those districts in the western-most part of the archipelago: Ilha das Flores and Ilha do Corvo.

districts_26N() returns the districts in the meter-based projection PTRA08 / UTM zone 26N, i.e. those districts in the Central and Eastern groups of the archipelago.

Usage

districts(crs = laea_azores_proj())

districts_25N()

districts_26N()

Arguments

crs	Coordinate reference system (CRS) passed on to st_transform(). Defaults to a custom CRS centered on the Azores, see laea_azores_proj() for more details. Other possible options are "EPSG: 3035" for ETRS89-extended / LAEA Europe or "EPSG:4326" for WGS 84.

Value

A simple features (sf) object with six fields:

id

An unique identifier for the district. Follows the format ⁠[DT][MN][FR]⁠: DT is a two-digit id for the district, MN for the municipality and FR for the district (freguesia in Portuguese).

district

Name of the civil district.

municipality

Name of municipality.

district

Name of district, coincides with the name of the island.

area

District area in hectares (ha).

perimeter

District perimeter in kilometers.

n_municipalities

Number of municipalities in the district.

n_parishes

Number of parishes in the district.

Examples

districts()
districts_25N()
districts_26N()

---

Compute the Exclusive Economic Zone (EEZ) for the Azores

Description

This function calculates the Exclusive Economic Zone (EEZ) boundary for the Azores by buffering each island by a specified distance (default 200 nautical miles) and merging the resulting buffers to create a single EEZ polygon.

Usage

eez(crs = laea_azores_proj(), distance = 200)

Arguments

crs	Character or CRS object. The target coordinate reference system (CRS) for the EEZ output. Defaults to laea_azores_proj() (a custom Lambert Azimuthal Equal-Area projection centered on the Azores).
distance	Numeric. The buffer distance in nautical miles (NM) around each island. Defaults to 200 (200 NM, the standard EEZ definition). If another value is provided, it will be converted to meters.

Details

The EEZ is defined as the area 200 nautical miles from the nearest baseline of each island. This function:

• Buffers each island by ⁠distance × 1,852⁠ meters (default: 370,400 meters).

• Merges overlapping buffers into a single EEZ boundary.

• Transforms the final EEZ to the specified crs.

Value

An sf object representing the EEZ as a single POLYGON.

Examples

library(ggplot2)
ggplot() +
geom_sf(data = eez(), fill = NA, linewidth = 1, col = "gray") +
 geom_sf(data = districts(), mapping = aes(fill = district), col = "white") +
 guides(fill = "none")

# WGS 84 projection
ggplot() +
geom_sf(data = eez(crs = "EPSG:4326"), fill = NA, linewidth = 1, col = "gray") +
 geom_sf(data = districts(crs = "EPSG:4326"), mapping = aes(fill = district), col = "white") +
 guides(fill = "none")

---

Azorean islands

Description

A brief dataset of the nine Azorean islands.

Usage

islands()

Value

A tibble with columns:

group

Island group.

is_triangle

Due to their proximity, Pico, Faial and São Jorge form the so-called Triangle of the Central Group of islands.

name

Island's name.

Examples

islands()

---

Lambert Azimuthal Equal-Area (LAEA) projection centered on the Azores

Description

laea_azores_proj() creates a PROJ string for a custom Lambert Azimuthal Equal-Area (LAEA) projection, centered on the Azores. It allows flexibility in setting the latitude and longitude center, datum, and units.

Usage

laea_azores_proj(lat_0 = 38.5, lon_0 = -28, datum = "WGS84", units = "m")

Arguments

lat_0	Numeric. Latitude of the projection's center. Defaults to 38.5 (Central Azores).
lon_0	Numeric. Longitude of the projection's center. Defaults to -28 (Central Azores).
datum	Character. The geodetic datum used for the projection. Defaults to "WGS84". Other options include "ETRS89", "NAD83", etc.
units	Character. Measurement units for the projection. Defaults to "m" (meters). Can be set to "ft" (feet) if needed.

Value

A character string representing the PROJ definition for the custom LAEA projection.

Examples

# Default Azores-centered LAEA projection
laea_azores_proj()

# Custom projection centered at a different location
laea_azores_proj(lat_0 = 38, lon_0 = -27, datum = "ETRS89")

---

Azorean municipalities

Description

municipalities() returns the boundaries of municipalities in the Azores.

municipalities_25N() returns the municipalities in the meter-based projection PTRA08 / UTM zone 25N, i.e. those municipalities in the western-most part of the archipelago: Ilha das Flores and Ilha do Corvo.

municipalities_26N() returns the municipalities in the meter-based projection PTRA08 / UTM zone 26N, i.e. those municipalities in the Central and Eastern groups of the archipelago.

Usage

municipalities(crs = laea_azores_proj())

municipalities_25N()

municipalities_26N()

Arguments

crs	Coordinate reference system (CRS) passed on to st_transform(). Defaults to a custom CRS centered on the Azores, see laea_azores_proj() for more details. Other possible options are "EPSG: 3035" for ETRS89-extended / LAEA Europe or "EPSG:4326" for WGS 84.

Value

A simple features (sf) object with six fields:

id

An unique identifier for the municipality. Follows the format ⁠[DT][MN]⁠: DT is a two-digit id for the district and MN for the municipality.

municipality

Name of municipality.

district

Name of district, coincides with the name of the island.

area

Municipality area in hectares (ha).

perimeter

Municipality perimeter in kilometers.

n_parishes

Number of parishes in municipality.

Examples

municipalities()
municipalities_25N()
municipalities_26N()

---

Azorean NUTS

Description

nuts() returns the boundaries of the Nomenclature of Territorial Units for Statistics (NUTS).

nuts_25N() returns the NUTS boundaries in the meter-based projection PTRA08 / UTM zone 25N, i.e. the NUTS area in the western-most part of the archipelago: Ilha das Flores and Ilha do Corvo.

nuts_26N() returns the NUTS boundaries in the meter-based projection PTRA08 / UTM zone 26N, i.e. the NUTS area in the Central and Eastern groups of the archipelago.

Usage

nuts(crs = laea_azores_proj())

nuts_25N()

nuts_26N()

Arguments

crs	Coordinate reference system (CRS) passed on to st_transform(). Defaults to a custom CRS centered on the Azores, see laea_azores_proj() for more details. Other possible options are "EPSG: 3035" for ETRS89-extended / LAEA Europe or "EPSG:4326" for WGS 84.

Value

A simple features (sf) object with seven fields:

nuts_code

NUTS code.

nuts_level

NUTS level.

nuts_name

NUTS name.

area

NUTS area in hectares (ha).

perimeter

NUTS perimeter in kilometers.

n_municipalities

Number of municipalities in the NUTS.

n_parishes

Number of parishes in the NUTS.

Examples

nuts()
nuts_25N()
nuts_26N()

---

Azorean civil administrative parishes

Description

parishes() returns the boundaries of civil parishes in the Azores.

parishes_25N() returns the parishes in the meter-based projection PTRA08 / UTM zone 25N, i.e. those parishes in the western-most part of the archipelago: Ilha das Flores and Ilha do Corvo.

parishes_26N() returns the parishes in the meter-based projection PTRA08 / UTM zone 26N, i.e. those parishes in the Central and Eastern groups of the archipelago.

Usage

parishes(crs = laea_azores_proj())

parishes_25N()

parishes_26N()

Arguments

crs	Coordinate reference system (CRS) passed on to st_transform(). Defaults to a custom CRS centered on the Azores, see laea_azores_proj() for more details. Other possible options are "EPSG: 3035" for ETRS89-extended / LAEA Europe or "EPSG:4326" for WGS 84.

Value

A simple features (sf) object with six fields:

id

An unique identifier for the parish. Follows the format ⁠[DT][MN][FR]⁠: DT is a two-digit id for the district, MN for the municipality and FR for the parish (freguesia in Portuguese).

parish

Name of the civil parish.

municipality

Name of municipality.

district

Name of district, coincides with the name of the island.

area

Parish area in hectares (ha).

perimeter

Parish perimeter in kilometers.

Examples

parishes()
parishes_25N()
parishes_26N()

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