obspy.clients.fdsn.mass_downloader.domain.Domain¶
-
class
Domain
[source]¶ Bases:
object
Abstract base class defining a domain - subclass it to define a new domain.
Each subclass must implement the
get_query_parameters()
method and optionally theis_in_domain()
method which enables the construction of arbitrarily complex domains. Theget_query_parameters()
method must return the query parameters to download as much data as required. Theis_in_domain()
can later be used to refine the domain after the data has been downloaded.It can be thought of as a boolean operation - first the rough domain is specified including all the possible points, then some points are removed again. This is illustrated with an example domain representing Germany utilizing the external packages shapely and fiona. Shapefiles can be found online on many websites, for example on http://www.gadm.org/. The example works by first extracting the bounds of the country to formulate the FDSN query and then removing points outside of the exact shape.
import fiona import shapely.geometry from obspy.clients.fdsn.mass_downloader import Domain class Germany(Domain): def __init__(self): Domain.__init__(self) fiona_collection = fiona.open("./DEU_adm/DEU_adm0.shp") geometry = fiona_collection.next()["geometry"] self.shape = shapely.geometry.asShape(geometry) self.b = fiona_collection.bounds def get_query_parameters(self): return {"minlatitude": self.b[1], "minlongitude": self.b[0], "maxlatitude": self.b[3], "maxlongitude": self.b[2]} def is_in_domain(self, latitude, longitude): if self.shape.contains(shapely.geometry.Point(longitude, latitude)): return True return False
This is further illustrated by the following image. The green rectangle denotes the original FDSN query which returns the blue points. In the second step the red points are discarded leaving only points (stations) within Germany.
Attributes
__abstractmethods__
__dict__
__doc__
__module__
__weakref__
list of weak references to the object (if defined)
Public Methods
Return the domain specific query parameters for the
get_stations()
method as a dictionary.Returns True/False depending on the point being in the domain.
Special Methods
Default dir() implementation.
Default object formatter.
This method is called when a class is subclassed.
Create and return a new object.
Helper for pickle.
Helper for pickle.
Size of object in memory, in bytes.
Abstract classes can override this to customize issubclass().