LIS: Viewtime Granules

Introduction to Lightning Imaging Sensor (LIS)

VIEWTIME GRANULES
structure name: viewtime

Status Parameter Structure Element Name Type Size Description

A grid cell position location float32 2 latitude and longitude of the CENTER of the grid cell of dimensions 0.5 deg x 0.5 deg

B start time TAI93_start int32 1 TAI93 whole second when location was first within FOV

C end time TAI93_end int32 1 TAI93 whole second when location was last within FOV

D effective viewtime effective_obs float32 1 the time of observation (in seconds) of the grid cell, adjusted by the percentage of area in the grid cell that was within field-of-view.

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

F 8-bit threshold approx_threshold byte 1 threshold of instrument corresponding with grid cell position (proxied from s.z.a. at a time half-way between start and end time)

VIEWTIME GRANULES structure name: viewtime
	Status	Parameter	Structure Element Name	Type	Size	Description
A		grid cell position	location	float32	2	latitude and longitude of the CENTER of the grid cell of dimensions 0.5 deg x 0.5 deg
B		start time	TAI93_start	int32	1	TAI93 whole second when location was first within FOV
C		end time	TAI93_end	int32	1	TAI93 whole second when location was last within FOV
D		effective viewtime	effective_obs	float32	1	the time of observation (in seconds) of the grid cell, adjusted by the percentage of area in the grid cell that was within field-of-view.
E		alert flag	alert_flag	byte	1	reflects status of instrument, platform, external factors, and processing algorithms
F		8-bit threshold	approx_threshold	byte	1	threshold of instrument corresponding with grid cell position (proxied from s.z.a. at a time half-way between start and end time)