Station

Introduction

The Station is the main component of Paricia. Stations own the measurement data, who can view the existing data and add new sets, and captures a lot of metadata on the geographical location of the station, including longitude, latitude and altitude, but also region, basin, ecosystem or area covered.

It also owns another key parameter used during the data ingestion process: the timezone where the station is located, used to interpret the time of the datasets.

Incorrect timezone

If this parameter is not defined correctly, the time of the data associated to the station would be interpreted wrong. Check the parameter before uploading data, specially the first time.

As pointed out in the permissions page, Stations visibility can take a third option, internal, that only allows registered users to visualize the data of the station. Stations also require change permission in order to be able to upload data associated to that station and then validating it.

Figure 1: UML diagram of the Station app models.

Basic Components

Country

The country where a station or region is in.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Country name.

Functions

__str__()

Return the country name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the country name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the country.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the country."""
    return reverse("station:country_detail", kwargs={"pk": self.pk})

Region

A region within a country.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Name of the region.
country	Country	Country where the region is located.

Functions

__str__()

Return the region name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the region name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the region.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the region."""
    return reverse("station:region_detail", kwargs={"pk": self.pk})

Ecosystem

The ecosystem associated with a station.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Name of the ecosystem, e.g. rain forest.

Functions

__str__()

Return the ecosystem name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the ecosystem name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the ecosystem.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the ecosystem."""
    return reverse("station:ecosystem_detail", kwargs={"pk": self.pk})

Institution

Institutional partner responsible for a station.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Name of the institution.

Functions

__str__()

Return the institution name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the institution name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the institution.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the institution."""
    return reverse("station:institution_detail", kwargs={"pk": self.pk})

StationType

Type of the station, indicating what it measures.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Name of the station type, e.g. pluvometric, hydrological.

Functions

__str__()

Return the station type name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the station type name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the station type.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the station type."""
    return reverse("station:stationtype_detail", kwargs={"pk": self.pk})

Place

Specific place that a station is situated.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Name of the place, e.g. Huaraz.
image	ImageField	Photography/Map of the location.

Functions

__str__()

Return the place name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the place name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the place.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the place."""
    return reverse("station:place_detail", kwargs={"pk": self.pk})

Basin

River(s) basin where the station is located e.g. El Carmen.

Attributes:

Name	Type	Description
id	int	Primary key.
name	str	Name of the basin, e.g. El Carmen.
image	ImageField	Photography/Map of the basin.
file	FileField	PDF file with details of the basin.

Functions

__str__()

Return the basin name.

Source code in station/models.py

def __str__(self) -> str:
    """Return the basin name."""
    return str(self.name)

get_absolute_url()

Return the absolute url of the basin.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the basin."""
    return reverse("station:basin_detail", kwargs={"pk": self.pk})

PlaceBasin

Associates a Basin with a Place and an image.

Attributes:

Name	Type	Description
id	int	Primary key.
place	Place	Place of the association.
basin	Basin	Basin of the association.
image	ImageField	Photography/Map of the place within the basin.

Functions

__str__()

Return the place-basin association.

Source code in station/models.py

def __str__(self) -> str:
    """Return the place-basin association."""
    return str(self.place) + " - " + str(self.basin)

get_absolute_url()

Return the absolute url of the place-basin association.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the place-basin association."""
    return reverse("station:placebasin_detail", kwargs={"pk": self.pk})

Core Components

Station

Main representation of a station, including several metadata.

Attributes:

Name	Type	Description
visibility	str	Visibility level of the object, including an "internal" option.
station_id	int	Primary key.
station_code	str	Unique code for the station.
station_name	str	Brief description of the station.
station_type	StationType	Type of the station.
country	Country	Country where the station is located.
region	Region	Region within the Country where the station is located.
ecosystem	Ecosystem	Ecosystem associated with the station.
institution	Institution	Institutional partner responsible for the station.
place_basin	PlaceBasin	Place-Basin association.
station_state	bool	Is the station operational?
timezone	str	Timezone of the station.
station_latitude	Decimal	Latitude of the station, in degrees [-90 to 90].
station_longitude	Decimal	Longitude of the station, in degrees [-180 to 180].
station_altitude	int	Altitude of the station.
influence_km	Decimal	Area of influence in km2.
station_file	ImageField	Photography of the station.
station_external	bool	Is the station external?
variables	str	Comma-separated list of variables measured by the station.

Attributes

variables_list property

Return the list of variables measured by the station.

Only variables with data in the database are returned.

Returns:

Type	Description
list[str]	list[str]: List of variables measured by the station.

Functions

__str__()

Return the station code.

Source code in station/models.py

def __str__(self) -> str:
    """Return the station code."""
    return str(self.station_code)

get_absolute_url()

Return the absolute url of the station.

Source code in station/models.py

def get_absolute_url(self) -> str:
    """Return the absolute url of the station."""
    return reverse("station:station_detail", kwargs={"pk": self.pk})

set_object_permissions()

Set object-level permissions.

This method is called by the save method of the model to set the object-level permissions based on the visibility level of the object. In addition to the standard permissions for the station, the view_measurements permission is set which controls who can view the measurements associated to the station.

Source code in station/models.py

def set_object_permissions(self) -> None:
    """Set object-level permissions.

    This method is called by the save method of the model to set the object-level
    permissions based on the visibility level of the object. In addition to the
    standard permissions for the station, the view_measurements permission is set
    which controls who can view the measurements associated to the station.
    """
    super().set_object_permissions()

    standard_group = Group.objects.get(name="Standard")
    anonymous_user = get_anonymous_user()

    # Assign view_measurements permission based on permissions level
    if self.visibility == "public":
        assign_perm("view_measurements", standard_group, self)
        assign_perm("view_measurements", anonymous_user, self)
        if self.owner:
            remove_perm("view_measurements", self.owner, self)
    elif self.visibility == "internal":
        assign_perm("view_measurements", standard_group, self)
        remove_perm("view_measurements", anonymous_user, self)
        if self.owner:
            remove_perm("view_measurements", self.owner, self)
    elif self.visibility == "private":
        remove_perm("view_measurements", standard_group, self)
        remove_perm("view_measurements", anonymous_user, self)
        if self.owner:
            assign_perm("view_measurements", self.owner, self)