lephare.filterSvc

Exceptions

SVOUnavailableError

The SVO filter service could not be reached, or gave an unusable answer.

Classes

FilterSvc

Filter service for retrieving filters from various sources.

Module Contents

exception SVOUnavailableError[source]

Bases: ConnectionError

The SVO filter service could not be reached, or gave an unusable answer.

The service is sometimes down, so callers which can do without it (tests, notebooks) can catch this exception and fall back on local filters.

class FilterSvc[source]

Filter service for retrieving filters from various sources.

This class defines a number of methods for loading and manipulating filters.

classmethod from_yaml(yaml_file)[source]

Load filter from a yaml file

Parameters:: yaml_file (str) – Path to yaml file
Returns:: flt_array – Array of wavelengths in Angstrom and filter transmissivity.
Return type:: list of lephare.flt
Raises:: SVOUnavailableError – If a filter is requested to the SVO (“svo:” prefix) and the server cannot be reached.

classmethod from_config(config_file)[source]

Load filter from a .para config file

Parameters:: config_file (str) – Path to config file
Returns:: flt_array – List of filters.
Return type:: list of lephare.flt

classmethod from_svo(counter, filter_id, system='AB', calib=0)[source]

Return filter from SVO

Parameters:

counter (int) – Filter number
filter_id (str) – Id of filter in SVO format.
system (str, optional) – Photometric system
calib (float, optional) – Calibration value. Not currently used.

Returns:

res – Filter in native lephare format.

Return type:

lephare.flt

Raises:

SVOUnavailableError – If the SVO server cannot be reached or does not give a valid answer.

classmethod from_file(filename, counter=-1, trans=0, calib=0)[source]

Return filter from SVO

Parameters:

filename (str) – Path to filter file.
counter (int) – Filter number
trans (int, optional) – Photometric system.
calib (int, optional) – Calibration value.

Returns:

f – Filter in native lephare format.

Return type:

lephare.flt

classmethod svo_request(counter, filter_id, system)[source]

Retrieve a filter from the SVO

Parameters:

counter (int) – Filter number
filter_id (str) – Id of filter in SVO format.
system (str, optional) – Photometric system

Returns:

res – Filter in native lephare format.

Return type:

lephare.flt

Raises:

SVOUnavailableError – If the SVO server cannot be reached or does not give a valid answer.
AssertionError – If the SVO reports an invalid filter_id.

classmethod from_keymap(keymap)[source]

Load filter from a config keymap.

Parameters:: keymap (dict of lephare.keyword) – The config keymap
Returns:: flt_array – List of filters.
Return type:: list of lephare.flt