[ncl-talk] Problem masking lat-lon points from a csv file using a shapefile

[Lyndz]

Hello,

I am trying to filter Tropical Cyclone (TC) lat-lon points from a csv file
using a shapefile and display the tracks.

I'm reading the csv file and shapefile like this:

    data=asciiread("jma.csv",(/1519,2/),"float")
    load "./shapefile_utils.ncl"
    shp_filename="Bicol_region.shp"
    data_mask    = shapefile_mask_data(data,shp_filename,True)

Error: shapefile_mask_data: Error: not a valid rectilinear, curvilinear, or
uns
tructured grid

I think I am missing a step after reading the csv file. Attached are the
shapefile and csv file.

Any suggestions on how to do this correctly in NCL?

Sincerely,

Lyndz
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