I used Makie to create a heatmap graph. The drawn graph has a lot of blank points. I think it might be caused by the fact that the altitude vector is different at each time point. Does anyone know how to deal with this?
Is this really produced by heatmap | Makie? If so – do you mind posting a MWE?
The code and data is as follows:
datetimes = floor(data.st, Hour):Hour(3):ceil(data.se, Hour)
tick_positions =datetime2unix.(datetimes)
tick_labels = Dates.format.(datetimes, "HH:MM")
let
fig = Figure(; size=(1200, 600))
ax1 = Axis(fig[1, 1], xlabel="Time UT", ylabel="Altitude (km)",
title=L"log_{10}(N_e [m^{-3}])",
xticks=(tick_positions, tick_labels))
xlims!(ax1, datetime2unix(floor(data.st, Hour)), datetime2unix(ceil(data.se, Hour)))
ylims!(ax1, 70, 1000)
heatmap!(ax1, datetime2unix.(tt), al, ne,
colormap=:jet,
colorrange=(10, 12))
Colorbar(fig[1, 2], colormap=:jet, limits=(10, 12))
fig
end
time,altitude,ne
2025-04-16T23:58:32.0,61.5489501953125,8.46123740339857
2025-04-16T23:58:32.0,65.36458587646484,6.0
2025-04-16T23:58:32.0,69.27091217041016,9.811731143661557
2025-04-16T23:58:32.0,74.56712341308594,9.967771762913046
2025-04-16T23:58:32.0,78.39364624023438,9.397121179304301
2025-04-16T23:58:32.0,82.29679107666016,9.875471469782088
2025-04-16T23:58:32.0,87.58624267578125,10.652210284204585
2025-04-16T23:58:32.0,93.66499328613281,9.915071502284924
2025-04-16T23:58:32.0,97.90210723876953,10.500229397799389
2025-04-16T23:58:32.0,104.59850311279297,10.865671245300838
2025-04-16T23:58:32.0,112.1823959350586,10.977574053799174
2025-04-16T23:58:32.0,120.05602264404297,10.950790662043062
2025-04-16T23:58:32.0,129.22979736328125,10.923193953178949
2025-04-16T23:58:32.0,139.7136688232422,10.934362123919962
2025-04-16T23:58:32.0,150.20567321777344,11.013070688308835
2025-04-16T23:58:32.0,161.792724609375,11.158825171810076
2025-04-16T23:58:32.0,174.91526794433594,11.167914867418292
2025-04-16T23:58:32.0,187.94107055664062,11.307858050285406
2025-04-16T23:58:32.0,202.3780517578125,11.515859715564606
2025-04-16T23:58:32.0,218.07240295410156,11.624994128385572
2025-04-16T23:58:32.0,233.8951416015625,11.82293412053667
2025-04-16T23:58:32.0,250.91709899902344,11.871886971890905
2025-04-16T23:58:32.0,269.3978271484375,11.955362175091125
2025-04-16T23:58:32.0,287.9805603027344,11.97928471562988
2025-04-16T23:58:32.0,307.93145751953125,12.034084381416125
2025-04-16T23:58:32.0,329.02301025390625,11.96806635307268
2025-04-16T23:58:32.0,350.52783203125,11.954381755849933
2025-04-16T23:58:32.0,373.32708740234375,11.929246723626783
2025-04-16T23:58:32.0,397.07147216796875,11.903049702608017
2025-04-16T23:58:32.0,420.90875244140625,11.790443919720476
2025-04-17T00:09:32.0,61.55434036254883,6.0
2025-04-17T00:09:32.0,65.36461639404297,10.356772639015668
2025-04-17T00:09:32.0,69.38404846191406,8.954829911261529
2025-04-17T00:09:32.0,74.51080322265625,8.854358168588206
2025-04-17T00:09:32.0,78.39337158203125,10.058352857592276
2025-04-17T00:09:32.0,82.46529388427734,9.045241940483667
2025-04-17T00:09:32.0,87.64409637451172,10.72009933228049
2025-04-17T00:09:32.0,93.69406127929688,10.580280892212498
2025-04-17T00:09:32.0,97.93019104003906,10.647582856698277
2025-04-17T00:09:32.0,104.54310607910156,10.874121077095438
2025-04-17T00:09:32.0,112.0151138305664,10.950607132920304
2025-04-17T00:09:32.0,120.7859878540039,10.986029097617731
2025-04-17T00:09:32.0,129.07492065429688,10.911377719514629
2025-04-17T00:09:32.0,139.65586853027344,11.016336609608329
2025-04-17T00:09:32.0,150.16624450683594,11.107973628342895
2025-04-17T00:09:32.0,161.82041931152344,11.213050493131759
2025-04-17T00:09:32.0,174.93011474609375,11.305656468384726
2025-04-17T00:09:32.0,187.91815185546875,11.455688422311434
2025-04-17T00:09:32.0,202.29971313476562,11.546995170334538
2025-04-17T00:09:32.0,218.13497924804688,11.717749371865125
2025-04-17T00:09:32.0,233.84820556640625,11.780597224713784
2025-04-17T00:09:32.0,250.95803833007812,11.861154074174088
2025-04-17T00:09:32.0,269.3504333496094,11.966102103231897
2025-04-17T00:09:32.0,287.9954528808594,11.975317263106078
2025-04-17T00:09:32.0,307.8057861328125,12.073463846874471
2025-04-17T00:09:32.0,329.2339172363281,12.044406413762218
2025-04-17T00:09:32.0,350.39776611328125,12.040871779247345
2025-04-17T00:09:32.0,372.95819091796875,12.011116052138636
2025-04-17T00:09:32.0,396.87933349609375,11.92728172010352
2025-04-17T00:09:32.0,420.65936279296875,11.824209193121193
2025-04-17T00:20:33.0,61.63723373413086,7.609990834072022
2025-04-17T00:20:33.0,65.36433410644531,8.905529969753724
2025-04-17T00:20:33.0,69.36307525634766,6.0
2025-04-17T00:20:33.0,74.55867767333984,9.98279956952498
2025-04-17T00:20:33.0,78.39350891113281,9.230481423782907
2025-04-17T00:20:33.0,82.30937957763672,9.824792207055483
2025-04-17T00:20:33.0,87.76779174804688,10.534829735184838
2025-04-17T00:20:33.0,93.55720520019531,10.01891507298412
2025-04-17T00:20:33.0,98.00763702392578,10.44247486831362
2025-04-17T00:20:33.0,104.37483978271484,10.790292067191231
2025-04-17T00:20:33.0,113.00078582763672,11.000198681030927
2025-04-17T00:20:33.0,120.23700714111328,10.919617636155348
2025-04-17T00:20:33.0,129.03607177734375,10.901268299786063
2025-04-17T00:20:33.0,139.89263916015625,11.0005337154339
2025-04-17T00:20:33.0,150.17283630371094,11.117761418534911
2025-04-17T00:20:33.0,161.96981811523438,11.145928661162355
2025-04-17T00:20:33.0,174.99896240234375,11.270010281544575
2025-04-17T00:20:33.0,188.08094787597656,11.426398579138722
2025-04-17T00:20:33.0,202.307861328125,11.50362771368949
2025-04-17T00:20:33.0,218.18032836914062,11.64060016490513
2025-04-17T00:20:33.0,233.8591766357422,11.751141565132135
2025-04-17T00:20:33.0,250.90953063964844,11.831956502243818
2025-04-17T00:20:33.0,269.3108825683594,11.9268097271308
2025-04-17T00:20:33.0,287.7954406738281,11.966549888470563
2025-04-17T00:20:33.0,307.8033752441406,12.040004425574471
2025-04-17T00:20:33.0,329.0226135253906,12.07436475838484
2025-04-17T00:20:33.0,350.211669921875,12.037377402836247
2025-04-17T00:20:33.0,372.9463806152344,12.012669357158613
2025-04-17T00:20:33.0,396.887451171875,11.932096299410135
2025-04-17T00:20:33.0,420.80291748046875,11.904883745807293
2025-04-17T00:31:34.0,61.575775146484375,8.384178384902434
2025-04-17T00:31:34.0,65.36470031738281,8.722326122424867
2025-04-17T00:31:34.0,69.2958984375,9.948107515719666
2025-04-17T00:31:34.0,74.62100982666016,9.680999632964948
2025-04-17T00:31:34.0,78.39344024658203,9.834926242987837
2025-04-17T00:31:34.0,82.38230895996094,9.755941421667147
2025-04-17T00:31:34.0,87.64270782470703,10.495029008509734
2025-04-17T00:31:34.0,93.68094635009766,10.06774611951658
2025-04-17T00:31:34.0,97.51851654052734,10.609557805898696
2025-04-17T00:31:34.0,104.40958404541016,10.90701708945975
2025-04-17T00:31:34.0,112.21839904785156,11.01061871601158
2025-04-17T00:31:34.0,120.15837097167969,10.96021630190543
2025-04-17T00:31:34.0,129.19456481933594,10.962918143406698
2025-04-17T00:31:34.0,139.7174835205078,11.026007444356967
2025-04-17T00:31:34.0,150.13124084472656,11.138363292769322
2025-04-17T00:31:34.0,161.9260711669922,11.248206782041938
2025-04-17T00:31:34.0,174.93443298339844,11.301082460271367
2025-04-17T00:31:34.0,188.06637573242188,11.42634486265452
2025-04-17T00:31:34.0,202.44970703125,11.516746234903621
2025-04-17T00:31:34.0,218.12110900878906,11.62431804727906
2025-04-17T00:31:34.0,233.84861755371094,11.74064669915975
2025-04-17T00:31:34.0,250.9377899169922,11.80452893874917
2025-04-17T00:31:34.0,269.1885681152344,11.94281849598754
2025-04-17T00:31:34.0,287.9707336425781,11.946401245266708
2025-04-17T00:31:34.0,307.7417907714844,11.993931525619011
2025-04-17T00:31:34.0,328.890380859375,12.023838771539207
2025-04-17T00:31:34.0,350.1716003417969,12.0758597150223
2025-04-17T00:31:34.0,372.6962890625,12.072815685413131
2025-04-17T00:31:34.0,396.6961669921875,11.994584076203417
2025-04-17T00:31:34.0,420.5193176269531,11.938181463659244
The positions where the values are unspecified are treated as if they contained NaN. That’s why you see the blank points.
I don’t think Makie’s heatmap supports interpolation out-of-box, so you probably have to interpolate the missing values yourself (e.g., https://stackoverflow.com/questions/68556256/2d-interpolation-in-julia).
You could also try tricontourf | Makie.