Note

Go to the end to download the full example code.

Animating drifter trajectories#

Trajan supports animating trajectory datasets using a builder pattern. Start with ds.traj.animate(), chain configuration methods, then call .show() to display interactively or .save() to write a file.

import logging
import numpy as np
import xarray as xr
import coloredlogs
import trajan as ta

coloredlogs.install(level=logging.DEBUG, logger=logging.getLogger('trajan'))

Load the Barents Sea drifter dataset, drop short gaps and grid to 6-hourly.

ds = xr.open_dataset(ta.DATA_DIR + 'barents.nc')

ds = ds.traj.drop_where(ds.traj.time_to_next() < np.timedelta64(5, 'm'))
ds = ds.traj.gridtime('6h')
speed = ds.traj.speed()

2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting time-variable for "obs"..
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: obs, detected time-variable: time.
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detected Ragged trajectory dataset
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting time-variable for "obs"..
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: obs, detected time-variable: time.
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detected Ragged trajectory dataset
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting time-variable for "obs"..
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: obs, detected time-variable: time.
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detected Ragged trajectory dataset
2026-08-24 11:12:10 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: time, detected time-variable: time.
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected Orthogonal trajectory dataset
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detecting time-variable for "obs"..
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: obs, detected time-variable: time.
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected Ragged trajectory dataset
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: time, detected time-variable: time.
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected Orthogonal trajectory dataset
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detecting trajectory dimension
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected obs-dim: time, detected time-variable: time.
2026-08-24 11:12:11 runnervm76f27 trajan.accessor[2752] DEBUG Detected Orthogonal trajectory dataset

Basic animation — just call .animate() and .show(). The title shows the current timestamp automatically.

ds.traj.animate().set_title('Barents Sea drifters').show()
Barents Sea drifters
2026-08-24 11:12:11 runnervm76f27 trajan.traj[2752] DEBUG Setting up new plot object.
2026-08-24 11:12:11 runnervm76f27 trajan.plot[2752] DEBUG Creating new figure and axes..
2026-08-24 11:12:11 runnervm76f27 trajan.animation[2752] DEBUG Dataset is already regularly gridded, skipping gridtime
2026-08-24 11:12:11 runnervm76f27 trajan.animation[2752] DEBUG Building animation: 192 frames


Colour particles by drift speed. Pass the DataArray directly to color_by — no need to add it to the dataset.

(ds.traj.animate()
    .color_by(speed, cmap='plasma', vmin=0, vmax=1,
              label='Speed  [m/s]')
    .set_title('Drifter speed')
    .show())
Drifter speed
2026-08-24 11:12:53 runnervm76f27 trajan.plot[2752] DEBUG Creating new figure and axes..
2026-08-24 11:12:53 runnervm76f27 trajan.animation[2752] DEBUG Dataset is already regularly gridded, skipping gridtime
2026-08-24 11:12:53 runnervm76f27 trajan.animation[2752] DEBUG Building animation: 192 frames
2026-08-24 11:12:53 runnervm76f27 matplotlib.colorbar[2752] DEBUG locator: <matplotlib.ticker.AutoLocator object at 0x7f0c71d391c0>


Show static trajectory lines in the background so the full path of each drifter is always visible.

(ds.traj.animate()
    .color_by(speed, cmap='plasma', vmin=0, vmax=1,
              label='Speed  [m/s]')
    .show_trajectories(alpha=0.15)
    .set_title('Speed with trajectory history')
    .show())
Speed with trajectory history
2026-08-24 11:13:37 runnervm76f27 trajan.plot[2752] DEBUG Creating new figure and axes..
2026-08-24 11:13:37 runnervm76f27 trajan.animation[2752] DEBUG Dataset is already regularly gridded, skipping gridtime
2026-08-24 11:13:37 runnervm76f27 trajan.animation[2752] DEBUG Building animation: 192 frames
2026-08-24 11:13:37 runnervm76f27 trajan.plot[2752] DEBUG Plotting lines
2026-08-24 11:13:37 runnervm76f27 trajan.plot[2752] DEBUG Plotting to existing Cartopy axes
2026-08-24 11:13:37 runnervm76f27 matplotlib.colorbar[2752] DEBUG locator: <matplotlib.ticker.AutoLocator object at 0x7f0c71fd5640>


Save the animation to an MP4 file (faster and smaller than GIF).

(ds.traj.animate()
    .color_by(speed, cmap='plasma', vmin=0, vmax=1,
              label='Speed  [m/s]')
    .show_trajectories(alpha=0.2)
    .set_title('Barents Sea drifters')
    .set_fps(10)
    .save('barents_drifters.mp4'))
Barents Sea drifters
2026-08-24 11:14:24 runnervm76f27 trajan.plot[2752] DEBUG Creating new figure and axes..
2026-08-24 11:14:24 runnervm76f27 trajan.animation[2752] DEBUG Dataset is already regularly gridded, skipping gridtime
2026-08-24 11:14:24 runnervm76f27 trajan.animation[2752] DEBUG Building animation: 192 frames
2026-08-24 11:14:24 runnervm76f27 trajan.plot[2752] DEBUG Plotting lines
2026-08-24 11:14:24 runnervm76f27 trajan.plot[2752] DEBUG Plotting to existing Cartopy axes
2026-08-24 11:14:24 runnervm76f27 matplotlib.colorbar[2752] DEBUG locator: <matplotlib.ticker.AutoLocator object at 0x7f0c71ed57f0>
2026-08-24 11:14:24 runnervm76f27 trajan.animation[2752] DEBUG Saving 192 frames to barents_drifters.mp4
2026-08-24 11:14:24 runnervm76f27 trajan.animation[2752] INFO Saving animation to barents_drifters.mp4..

Saving barents_drifters.mp4:   0%|          | 0/192 [00:00<?, ?frame/s]2026-08-24 11:14:24 runnervm76f27 matplotlib.animation[2752] INFO Animation.save using <class 'matplotlib.animation.FFMpegWriter'>
2026-08-24 11:14:24 runnervm76f27 matplotlib.animation[2752] DEBUG frame size in pixels is 1090 x 1100
2026-08-24 11:14:24 runnervm76f27 matplotlib.animation[2752] INFO MovieWriter._run: running command: ffmpeg -f rawvideo -vcodec rawvideo -s 1090x1100 -pix_fmt rgba -framerate 10 -i pipe: -vcodec libx264 -b 1800k -profile:v baseline -vf 'crop=trunc(iw/2)*2:trunc(ih/2)*2' -pix_fmt yuv420p -an -y barents_drifters.mp4

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2026-08-24 11:15:45 runnervm76f27 matplotlib.animation[2752] DEBUG MovieWriter stderr:
ffmpeg version 9.0.1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 15.3.0 (conda-forge gcc 15.3.0-1)
  configuration: --prefix=/home/runner/micromamba/envs/trajan --cc=x86_64-conda-linux-gnu-cc --cxx=x86_64-conda-linux-gnu-c++ --nm=x86_64-conda-linux-gnu-nm --ar=x86_64-conda-linux-gnu-ar --disable-doc --enable-openssl --enable-demuxer=dash --enable-hardcoded-tables --enable-libfreetype --enable-libharfbuzz --enable-libfontconfig --enable-libopenh264 --enable-libdav1d --disable-gnutls --enable-libvpx --enable-libass --enable-libplacebo --enable-pthreads --enable-alsa --enable-libpulse --enable-libvpl --enable-vaapi --enable-libopenvino --enable-gpl --enable-libx264 --enable-libx265 --enable-libmp3lame --enable-libaom --enable-libsvtav1 --enable-libxml2 --enable-pic --enable-shared --disable-static --enable-version3 --enable-zlib --enable-libvorbis --enable-libopus --enable-librsvg --enable-libjxl --enable-libwebp --enable-ffplay --enable-vulkan --pkg-config=/home/conda/feedstock_root/build_artifacts/ffmpeg_1786704214788/_build_env/bin/pkg-config
  libavutil      61.  1.101 / 61.  1.101
  libavcodec     63.  1.101 / 63.  1.101
  libavformat    63.  1.101 / 63.  1.101
  libavdevice    63.  1.101 / 63.  1.101
  libavfilter    12.  1.101 / 12.  1.101
  libswscale     10.  1.101 / 10.  1.101
  libswresample   7.  1.101 /  7.  1.101
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, start: 0.000000, bitrate: 383680 kb/s
  Stream #0:0: Video: rawvideo (RGBA / 0x41424752), rgba, 1090x1100, 383680 kb/s, 10 tbr, 10 tbn
Please use -b:a or -b:v, -b is ambiguous
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
[libx264 @ 0x555fd2193140] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x555fd2193140] profile Constrained Baseline, level 3.2, 4:2:0, 8-bit
[libx264 @ 0x555fd2193140] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=1800 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'barents_drifters.mp4':
  Metadata:
    encoder         : Lavf63.1.101
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, progressive), 1090x1100, q=2-31, 1800 kb/s, 10 fps, 10240 tbn
    Metadata:
      encoder         : Lavc63.1.101 libx264
    Side data:
      CPB properties: bitrate max/min/avg: 0/0/1800000 buffer size: 0 vbv_delay: N/A
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frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:01.50
frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:02.00
frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:02.50
frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:03.00
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frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:12.00
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frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:13.00
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frame=    0 fps=0.0 q=0.0 size=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:18.00
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frame=   10 fps=0.4 q=4.0 size=       0KiB time=00:00:01.00 bitrate=   0.4kbits/s speed=0.0425x elapsed=0:00:23.50
frame=   11 fps=0.5 q=4.0 size=       0KiB time=00:00:01.10 bitrate=   0.3kbits/s speed=0.0458x elapsed=0:00:24.00
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frame=   13 fps=0.5 q=2.0 size=       0KiB time=00:00:01.30 bitrate=   0.3kbits/s speed=0.052x elapsed=0:00:25.00
frame=   14 fps=0.5 q=2.0 size=       0KiB time=00:00:01.40 bitrate=   0.3kbits/s speed=0.0549x elapsed=0:00:25.50
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frame=   17 fps=0.6 q=0.0 size=       0KiB time=00:00:01.70 bitrate=   0.2kbits/s speed=0.0641x elapsed=0:00:26.50
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frame=   19 fps=0.7 q=0.0 size=       0KiB time=00:00:01.90 bitrate=   0.2kbits/s speed=0.0691x elapsed=0:00:27.50
frame=   20 fps=0.7 q=0.0 size=       0KiB time=00:00:02.00 bitrate=   0.2kbits/s speed=0.0714x elapsed=0:00:28.00
frame=   22 fps=0.8 q=0.0 size=       0KiB time=00:00:02.20 bitrate=   0.2kbits/s speed=0.0772x elapsed=0:00:28.50
frame=   23 fps=0.8 q=0.0 size=       0KiB time=00:00:02.30 bitrate=   0.2kbits/s speed=0.0793x elapsed=0:00:29.00
frame=   24 fps=0.8 q=0.0 size=       0KiB time=00:00:02.40 bitrate=   0.2kbits/s speed=0.0813x elapsed=0:00:29.50
frame=   25 fps=0.8 q=0.0 size=       0KiB time=00:00:02.50 bitrate=   0.2kbits/s speed=0.0833x elapsed=0:00:30.00
frame=   26 fps=0.9 q=0.0 size=       0KiB time=00:00:02.60 bitrate=   0.1kbits/s speed=0.0852x elapsed=0:00:30.50
frame=   28 fps=0.9 q=0.0 size=       0KiB time=00:00:02.80 bitrate=   0.1kbits/s speed=0.0903x elapsed=0:00:31.00
frame=   29 fps=0.9 q=0.0 size=       0KiB time=00:00:02.90 bitrate=   0.1kbits/s speed=0.092x elapsed=0:00:31.50
frame=   30 fps=0.9 q=0.0 size=       0KiB time=00:00:03.00 bitrate=   0.1kbits/s speed=0.0937x elapsed=0:00:32.00
frame=   31 fps=1.0 q=0.0 size=       0KiB time=00:00:03.10 bitrate=   0.1kbits/s speed=0.0954x elapsed=0:00:32.50
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frame=   37 fps=1.1 q=0.0 size=       0KiB time=00:00:03.70 bitrate=   0.1kbits/s speed=0.106x elapsed=0:00:35.00
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[out#0/mp4 @ 0x555fd2192680] video:183KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.854191%
frame=  192 fps=2.4 q=-1.0 Lsize=     185KiB time=00:00:19.20 bitrate=  78.9kbits/s speed=0.24x elapsed=0:01:19.95
[libx264 @ 0x555fd2193140] frame I:1     Avg QP: 2.97  size: 32130
[libx264 @ 0x555fd2193140] frame P:191   Avg QP: 1.12  size:   812
[libx264 @ 0x555fd2193140] mb I  I16..4: 88.1%  0.0% 11.9%
[libx264 @ 0x555fd2193140] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.7%  0.0%  0.0%  0.0%  0.0%    skip:99.1%
[libx264 @ 0x555fd2193140] final ratefactor: -17.65
[libx264 @ 0x555fd2193140] coded y,uvDC,uvAC intra: 9.6% 7.0% 6.9% inter: 0.3% 0.1% 0.1%
[libx264 @ 0x555fd2193140] i16 v,h,dc,p: 88% 10%  2%  0%
[libx264 @ 0x555fd2193140] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 29% 23%  3%  3%  3%  3%  3%  3%
[libx264 @ 0x555fd2193140] i8c dc,h,v,p: 95%  3%  2%  0%
[libx264 @ 0x555fd2193140] ref P L0: 91.4%  4.8%  3.8%
[libx264 @ 0x555fd2193140] kb/s:77.97


Saving barents_drifters.mp4: 100%|██████████| 192/192 [01:20<00:00,  2.39frame/s]


gallery/animations/example_animation_0.gif

Total running time of the script: (4 minutes 21.182 seconds)

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