Adding drifter data tutorial to virtualship docs #92
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| "import numpy as np\n", | ||
| "import xarray as xr\n", | ||
| "import matplotlib.pyplot as plt\n", | ||
| "import trajan\n", |
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It's confusing that there is also a Traja package doing similar things and Trajan is not literally used in the script below
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I hadn't heard of Traja before, to be honest. We use TrajAn for quick plotting of Parcels output in the Parcels tutorials too. And it is used below, as a method on the xarray dataset, when we do ds.traj.plot()
| "outputs": [], | ||
| "source": [ | ||
| "expedition_directory = Path(\"/Users/erik/Desktop/VSC_AgulhasDrifters\")\n", | ||
| "fieldset = InputData._load_default_fieldset(expedition_directory)" |
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Shall we make the data available from surfdrive for now? Or do you suggest everyone does the download themselves? Then maybe be more explicit about that, instead of "we have downloaded"
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I saw that you provided the output in other tutorials but thought here it would be nice to show how to run. So, I wanted to do the full download here, but since virtualship fetch is not yet at the point where it can supersmoothly be run, I decided to be a bit vague here. Depending on how fast the development of #83 goes, we could wait for that and then be more explicit here?
| "outputs": [], | ||
| "source": [ | ||
| "expedition_directory = Path(\"/Users/erik/Desktop/VSC_AgulhasDrifters\")\n", | ||
| "fieldset = InputData._load_default_fieldset(expedition_directory)" |
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Interesting that we're using an _ function from parcels to read in the data. Why?
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This is a private function in VirtualShip, not in Parcels. But indeed, I needed to use this private function to load in the FieldSet, again because the whole virtualship fetch/run workflow isn't quite ready
| "metadata": {}, | ||
| "source": [ | ||
| "The simplest way to plot these trajectories is to use the [TrajAn package](https://opendrift.github.io/trajan/). As you see below, the drifters all start in the Agulhas Current and most are initially advected southwestwards (although some first move northeastwards). At least two drifters take a path farther offshore, where their trajectories are much more eddying. When the inshore drifters reach approximately 25E, some of them start to circulate in eddies, and their tracks become even more convoluted." | ||
| ] |
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Can you add points of the initial releases?
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Not by default I think, but I'll check
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Done now in b1ec83c
Adding a tutorial on how to create, visualize and analyse Drifter data from the VirtualShip