Hello, I am new to Orekit. I hope to use TLE tool to load data. However I failed when I new TLE with 2 line strings. The message shows that “no IERS UTC-TAI history data loaded”. I am confused and not know the reason. I am using orekit-10.0-bin.jar with vscode. I would appreciate your help.
Hello zxx, and welcome to the Orekit community !
What you are experiencing is very common for newcomers. The problem is that Orekit requires data to perform most of its operations. This data is not included in the main jar file, because the user might need to change it. However, a sample zip file containing appropriate data is available to download on Orekit website.
I see in your screenshot that you have a directory named ‘orekit-data’, so maybe you have already downloaded everything. In this case, you probably just need to tell Orekit where to find the data. You can check the following documentation page to learn how to do so : https://www.orekit.org/site-orekit-10.0/configuration.html
For a basic configuration with the default zip file, the quickest answer is provided in the ‘Quick setup using default data’ section of this documentation page.
After that, you might want to check out the ‘tutorial’ section of the documentation. There are some very useful examples and explanations there.
Best wishes for your Orekit-based project
Yannick
Thank you very much. I’ve seen that in configuration page and also seen my question is a common one on the FAQ page. Thank you again!
You’re welcome
These lines don’t work for me in python:
File orekitData = new File(“/path/to/the/folder/orekit-data”);
DataProvidersManager manager = DataProvidersManager.getInstance();
manager.addProvider(new DirectoryCrawler(orekitData));
Is there any way to get them converted and make them usable for python?
Hi,
With the wrapper, the calls work a bit differently (and more generally for Python as opposed to Java). For instance, you don’t need to declare explicitly the type of the variables before you define them (e.g. no File before orekitData) and there is no new keyword needed.
Check out the dedicated gitlab repo for more examples.
Best,
Romain
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Hi @Serrof , thank you so much!
I didn’t know about the examples and found the corresponding lines there.