Monsoon low-pressure-system tracks over South Asia (1979-2019)

Monsoon LPS tracks over South Asia, computed using ERA-Interim reanalysis data.
Tracking algorithm described in Hunt and Fletcher (2018) [doi:10.1007/s00382-019-04744-x] and Hunt et al. (2016) [doi:10.1175/MWR-D-15-0138.1].

Description of fields:
point_id: unique integer identifier for each point
time: string with format DD/MM/YY HH:MM, denoting time of detected track point
lon: longitude of detected track point
lat: latitude of detected track point
track_id: unique integer identifier for each track (constituting a group of points)
vort: relative vorticity at 850 hPa for the given point (units: s-1)
circulation: vorticity integrated over the blob of positive vorticity containing the track point (units: arb)
eccentricity: eccentricity of the vorticity blob containing the track point
category: integer from 0-6 denoting the category of the LPS at the given point, approximately matching IMD criteria. 0: low-pressure area, 1: deep low-pressure area, 2: depression, 3: deep depression, 4: cyclonic storm, 5: severe cyclonic storm, 6: very severe cyclonic storm (and above).