LIS: Event

Introduction to Lightning Imaging Sensor (LIS)

EVENTS
structure name: event

Status Parameter Structure Element Name Type Size Description

A event time TAI93_time float64 1 TAI93 time of event

B length of observation observe_time int16 1 length of observation of the region where the event occurred (viewtime approximation at event centroid)

C geolocated position location float32 2 latitude & longitude

D calibrated radiance radiance float32 1 transient radiance above background radiance observed during the 2ms sample period

E footprint size footprint float32 1 areal extent of event in sq km (non-overlapping field-of-view associated with pixel)

F event record number address int32 1 event address

G parent record number parent_address int32 1 pointer to parent's address (address of parent group)

H x pixel x_pixel byte 1 CCD pixel column

I y pixel y_pixel byte 1 CCD pixel row

J background illumination bg_value int16 1 level of background illumination (16-bit amplitude -- uncalibrated) at time of event

K background radiance bg_radiance int16 1 background radiance associated with pixel at time of event

L 7-bit amplitude amplitude byte 1 uncalibrated optical amplitude reported by instrument (a 7-bit digital count)

M solar zenith angle sza_index byte 1 solar zenith angle

N solar glint angle glint_index byte 1 angle between line of sight vector and direct solar reflection vector

O 8-bit threshold value approx_threshold byte 1 estimated value of threshold (an 8-bit digital count) for the event-- determined from the background level of illumination

P alert flag alert_flag byte 1 reflects status of instrument, platform, external factors, and processing algorithms

Q clustering probability tag cluster_index byte 1 ranges from 0 to 99 (a high number indicates that event is not likely to be random noise)

R lightning activity index density_index byte 1 a spatial metric that indicates whether the event was geolocated in a region of high lightning activity

S noise index noise_index byte 1 a metric that indicates whether the event was detected during a period of high noise (100 - percent signal)

T bkg illumination flag bg_value_flag byte 1 indicates whether the value for the background illumination is (1) proxied using s.z.a. or (0) interpolated from background images

U time order grouping_sequence int32 1 time sequence of event

EVENTS structure name: event
	Status	Parameter	Structure Element Name	Type	Size	Description
A		event time	TAI93_time	float64	1	TAI93 time of event
B		length of observation	observe_time	int16	1	length of observation of the region where the event occurred (viewtime approximation at event centroid)
C		geolocated position	location	float32	2	latitude & longitude
D		calibrated radiance	radiance	float32	1	transient radiance above background radiance observed during the 2ms sample period
E		footprint size	footprint	float32	1	areal extent of event in sq km (non-overlapping field-of-view associated with pixel)
F		event record number	address	int32	1	event address
G		parent record number	parent_address	int32	1	pointer to parent's address (address of parent group)
H		x pixel	x_pixel	byte	1	CCD pixel column
I		y pixel	y_pixel	byte	1	CCD pixel row
J		background illumination	bg_value	int16	1	level of background illumination (16-bit amplitude -- uncalibrated) at time of event
K		background radiance	bg_radiance	int16	1	background radiance associated with pixel at time of event
L		7-bit amplitude	amplitude	byte	1	uncalibrated optical amplitude reported by instrument (a 7-bit digital count)
M		solar zenith angle	sza_index	byte	1	solar zenith angle
N		solar glint angle	glint_index	byte	1	angle between line of sight vector and direct solar reflection vector
O		8-bit threshold value	approx_threshold	byte	1	estimated value of threshold (an 8-bit digital count) for the event-- determined from the background level of illumination
P		alert flag	alert_flag	byte	1	reflects status of instrument, platform, external factors, and processing algorithms
Q		clustering probability tag	cluster_index	byte	1	ranges from 0 to 99 (a high number indicates that event is not likely to be random noise)
R		lightning activity index	density_index	byte	1	a spatial metric that indicates whether the event was geolocated in a region of high lightning activity
S		noise index	noise_index	byte	1	a metric that indicates whether the event was detected during a period of high noise (100 - percent signal)
T		bkg illumination flag	bg_value_flag	byte	1	indicates whether the value for the background illumination is (1) proxied using s.z.a. or (0) interpolated from background images
U		time order	grouping_sequence	int32	1	time sequence of event