dems

DESHIMA measurement set by DataArray

Installation

pip install dems==2025.6.1

Usage

from dems.d2 import MS


da = MS.new(
    data=[[0.0, ...], ...],
    mask=[[False, ...], ...],
    weight=[[1.0, ...], ...],
    ...
)

DataArray specifications

Category	Variable name	Variable type	Description	Units	Default	Data type	DataArray dims	DataArray dtype
Data	data	Data	Data values	-	-	numpy.ndarray	(time, chan)	-
	mask	Coordinate	Data masks	-	False	numpy.ndarray	(time, chan)	bool
	weight	Coordinate	Data weights	-	1.0	numpy.ndarray	(time, chan)	float64
	long_name	Attribute	Data name	-	"Brightness"	str	-	-
	units	Attribute	Data units	-	"K"	str	-	-
	name	Name	DEMS name	-	"DEMS"	str	-	-
Dimensions	time	Dimension	Start time in UTC	-	1970-01-01T00:00:00.000000000	numpy.ndarray	(time,)	datetime64[ns]
	chan	Dimension	Channel ID	-	0	numpy.ndarray	(chan,)	int64
Labels	observation	Coordinate	Observation label	-	""	numpy.ndarray	(time,)	str (<U16)
	scan	Coordinate	Scan label	-	""	numpy.ndarray	(time,)	str (<U16)
	subscan	Coordinate	Sub-scan label	-	""	numpy.ndarray	(time,)	str (<U16)
	state	Coordinate	State label	-	""	numpy.ndarray	(time,)	str (<U16)
	beam	Coordinate	Beam label	-	""	numpy.ndarray	(time,)	str (<U16)
Telescope pointing	lon	Coordinate	Sky longitude	deg	0.0	numpy.ndarray	(time,)	float64
	lat	Coordinate	Sky latitude	deg	0.0	numpy.ndarray	(time,)	float64
	lon_origin	Coordinate	Reference sky longitude	deg	0.0	numpy.ndarray	(time,)	float64
	lat_origin	Coordinate	Reference sky latitude	deg	0.0	numpy.ndarray	(time,)	float64
	frame	Coordinate	Sky coordinate frame	-	"altaz"	numpy.ndarray	()	str (<U16)
Weather information	temperature	Coordinate	Ground atmospheric temperature	K	0.0	numpy.ndarray	(time,)	float64
	pressure	Coordinate	Ground atmospheric pressure	hPa	0.0	numpy.ndarray	(time,)	float64
	humidity	Coordinate	Ground relative humidity	%	0.0	numpy.ndarray	(time,)	float64
	pwv	Coordinate	Precipitable water vapor	mm	0.0	numpy.ndarray	(time,)	float64
	wind_speed	Coordinate	Ground wind speed	m s^-1	0.0	numpy.ndarray	(time,)	float64
	wind_direction	Coordinate	Ground wind direction	deg	0.0	numpy.ndarray	(time,)	float64
Data information	bandwidth	Coordinate	Effective channel bandwidth	Hz	0.0	numpy.ndarray	(chan,)	float64
	frequency	Coordinate	Channel center frequency	Hz	0.0	numpy.ndarray	(chan,)	float64
	beam_major	Coordinate	Beam major axis	deg	0.0	numpy.ndarray	(chan,)	float64
	beam_minor	Coordinate	Beam minor axis	deg	0.0	numpy.ndarray	(chan,)	float64
	beam_pa	Coordinate	Beam position angle	deg	0.0	numpy.ndarray	(chan,)	float64
	exposure	Coordinate	Sample exposure time	s	0.0	numpy.ndarray	()	float64
	interval	Coordinate	Sample interval time	s	0.0	numpy.ndarray	()	float64
Observation information	observer	Attribute	Observer name	-	""	str	-	-
	project	Attribute	Project name	-	""	str	-	-
	object	Attribute	Object name	-	""	str	-	-
	telescope_name	Attribute	Telescope name	-	""	str	-	-
	telescope_diameter	Attribute	Telescope dish diameter	m	0.0	float	-	-
	telescope_coordinates	Attribute	Telescope ITRS coordinates	m	(0.0, 0.0, 0.0)	"tuple[float, float, float]"	-	-
ASTE specific	aste_cabin_temperature	Coordinate	[ASTE] Cabin temperature	K	0.0	numpy.ndarray	(time,)	float64
	aste_obs_group	Attribute	[ASTE] Observation group	-	""	str	-	-
	aste_obs_id	Attribute	[ASTE] Observation ID	-	""	str	-	-
	aste_obs_project	Attribute	[ASTE] Observation project	-	""	str	-	-
	aste_obs_file	Attribute	[ASTE] Observation instruction (= observation)	-	""	str	-	-
	aste_obs_user	Attribute	[ASTE] Observer (= observer)	-	""	str	-	-
	aste_subref_x	Coordinate	[ASTE] Subreflector offset of X axis	mm	0.0	numpy.ndarray	(time,)	float64
	aste_subref_y	Coordinate	[ASTE] Subreflector offset of Y axis	mm	0.0	numpy.ndarray	(time,)	float64
	aste_subref_z	Coordinate	[ASTE] Subreflector offset of Z axis	mm	0.0	numpy.ndarray	(time,)	float64
	aste_subref_xt	Coordinate	[ASTE] Subreflector rotation of X axis	deg	0.0	numpy.ndarray	(time,)	float64
	aste_subref_yt	Coordinate	[ASTE] Subreflector rotation of Y axis	deg	0.0	numpy.ndarray	(time,)	float64
	aste_subref_zt	Coordinate	[ASTE] Subreflector rotation of Z axis	deg	0.0	numpy.ndarray	(time,)	float64
	aste_misti_lon	Coordinate	[ASTE] MiSTI sky longitude	deg	0.0	numpy.ndarray	(time,)	float64
	aste_misti_lat	Coordinate	[ASTE] MiSTI sky latitude	deg	0.0	numpy.ndarray	(time,)	float64
	aste_misti_pwv	Coordinate	[ASTE] MiSTI measured PWV	mm	0.0	numpy.ndarray	(time,)	float64
	aste_misti_frame	Coordinate	[ASTE] MiSTI sky coordinate frame	-	"altaz"	numpy.ndarray	()	str (<U16)
DESHIMA 2.0 specific	d2_mkid_id	Coordinate	[DESHIMA 2.0] MKID master ID (= chan)	-	""	numpy.ndarray	(chan,)	int64
	d2_mkid_type	Coordinate	[DESHIMA 2.0] MKID type	-	""	numpy.ndarray	(chan,)	str (<U16)
	d2_mkid_frequency	Coordinate	[DESHIMA 2.0] MKID center frequency	Hz	0.0	numpy.ndarray	(chan,)	float64
	d2_mkid_q	Coordinate	[DESHIMA 2.0] MKID quality factor	-	0.0	numpy.ndarray	(chan,)	float64
	d2_resp_fwd	Coordinate	[DESHIMA 2.0] Forward efficiency	-	0.0	numpy.ndarray	(chan,)	float64
	d2_resp_p0	Coordinate	[DESHIMA 2.0] Proportional coefficient of responsivity	K^-0.5	0.0	numpy.ndarray	(chan,)	float64
	d2_resp_t0	Coordinate	[DESHIMA 2.0] Correction temperature of responsivity	K	0.0	numpy.ndarray	(chan,)	float64
	d2_roomchopper_isblocking	Coordinate	[DESHIMA 2.0] Whether room chopper is blocking sensor	-	False	numpy.ndarray	(time,)	bool
	d2_skychopper_isblocking	Coordinate	[DESHIMA 2.0] Whether sky chopper is blocking sensor	-	False	numpy.ndarray	(time,)	bool
	d2_ddb_version	Attribute	[DESHIMA 2.0] DDB version	-	""	str	-	-
	d2_demerge_version	Attribute	[DESHIMA 2.0] demerge version	-	""	str	-	-
	d2_dems_version	Attribute	[DESHIMA 2.0] DEMS version	-	""	str	-	-
	d2_merge_datetime	Attribute	[DESHIMA 2.0] Date and time of the data merge	-	-	str	-	-
	d2_merge_options	Attribute	[DESHIMA 2.0] Options passed to the data merge	-	{}	dict[str, Any]	-	-