apogee | Tools for dealing with APOGEE data | Data Visualization library
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kandi X-RAY | apogee Summary
Tools for dealing with APOGEE data
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Top functions reviewed by kandi - BETA
- Main function for all stars
- Download a file
- Return the index of a parameter
- Return the base url
- Process the observation log
- Append a new record to the recarray
- Create a base - sample
- Close the process
- Add precession motifs
- Generate a set of windows
- Plot self self self self
- Fit a polynomial model
- Calculate McmC
- Wrapper for the synth function
- Create an rcsample
- This function extracts all the HEALGITS data for a given image
- Return the aspcapStar path
- Convert wavelength to pixel coordinates
- Plot the histogram
- Return the path to the apStar image
- Load the selection data
- Fit all elements in a list
- Create an observation log file
- Plot the average mass
- Generate atomic numbers
- Plot the pop mass of the population
apogee Key Features
apogee Examples and Code Snippets
Community Discussions
Trending Discussions on apogee
QUESTION
I'm scraping a website that has a table of satellite values (https://planet4589.org/space/gcat/data/cat/satcat.html).
Because every entry is only separated by whitespace, I need a way to split the string of data entries into an array.
However, the .split() function does not suit my needs, because some of the data entries have spaces (e.g. Able 3), I can't just split everything separated by whitespace.
It get's trickier, however. In some cases where no data is available, a dash ("-") is used. If two data entries are separated by only a space, and one of them is a dash, I don't want to include it as one entry.
e.g say we have the two entries "Able 3" and "-", separated only by a single space. In the file, they would appear as "Able 3 -". I want to split this string into the separate data entries, "Able 3" and "-" (as a list, this would be ["Able 3", "-"]).
Another example would be the need to split "data1 -" into ["data1", "-"]
Pretty much, I need to take a string and split it into a list or words separated by whitespace, except when there is a single space between words, and one of them is not a dash.
Also, as you can see the table is massive. I thought about looping through every character, but that would be too slow, and I need to run this thousands of times.
Here is a sample from the beginning of the file:
...ANSWER
Answered 2020-Dec-16 at 06:57One approach is to use pandas.read_fwf(), which reads text files in fixed-width format. The function returns Pandas DataFrames, which are useful for handling large data sets.
As a quick taste, here's what this simple bit of code does:
QUESTION
Hi I am looking to plot a spectra on python of a fits file. ESO has a guide on how to display 1D spectra and a code that should work which is the following:
...ANSWER
Answered 2020-Nov-01 at 20:46I had a look at a random spectrum downloaded from this page. Indeed it contains only one HDU so you will get an IndexError if you try to access data from an HDU that does not exist.
The code you linked to might be old (it is on an "archive" page after all) and is also merely an example, not necessarily appropriate for plotting data from any FITS file.
The specutils package has many utilities for analyzing and plotting 1D spectra. It can also read spectra from many common FITS formats without having to do too much manually.
Here's what I did. First I opened the file, this one in particular:
QUESTION
I'm trying to calculate the perigee and apogee of a given satellite based on its TLE
...ANSWER
Answered 2020-Aug-25 at 00:39Correct, you have a slight misconception about the distance you are asking for; and then there’s some other discrepancy that I am less sure of.
- The “subpoint” beneath a body is the position on the Earth’s surface, where that surface is modeled as the WGS-84 oblate spheroid with several km more fatness at the equator than at the poles. So instead of using the
subpoint.elevation.kmwhich measures against that rising and falling surface as the ISS crosses from high to low latitude, try justgeocentric.distance().km. You can always then subtract the Earth’s mean radius from that if you are less interested in the full shape of the orbit from the Earth’s center, than in just that component that’s above ground. - I am not well enough versed in the math to be sure why your back-of-the-envelope calculation is off. But we can at least compare the maximum and minimum of
geocentric.distance().kmwith, say, NASA HORIZONS output for comparison. I attach some of its output below: it shows the ISS rising and falling from 6788 km to 6803 km over an orbit, almost the same distances as the 6789–6802 km range returned from Skyfield — suggesting that the range in altitude is indeed more than 2 km for the current orbit.
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Install apogee
You can use apogee like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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