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The packages [LsqFit](https://julianlsolvers.github.io/LsqFit.jl/latest/) and [GLM](https://juliastats.org/GLM.jl/v0.11/#Minimal-examples-1) (for generalized linear models) contain functions for performing and evaluating these types of linear fits.
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The packages [LsqFit](https://julianlsolvers.github.io/LsqFit.jl/dev/) and [GLM](https://juliastats.org/GLM.jl/v0.11/#Minimal-examples-1) (for generalized linear models) contain functions for performing and evaluating these types of linear fits.
Copy file name to clipboardExpand all lines: docs/src/tutorials/jwst-image-scale-bar.md
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## Packages
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*[`Downloads`](https://docs.julialang.org/en/v1/stdlib/Downloads/): we'll use this built-in Julia standard library to download the raw image data
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*[`AstroImages`](http://juliaastro.org/AstroImages.jl/dev/): we'll use this package to load and display the image
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*[`Plots`](https://docs.juliaplots.org/latest/): we'll use this package to display coordinates along the image and add the scalebar
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*[`AstroImages`](http://juliaastro.org/AstroImages/stable/): we'll use this package to load and display the image
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*[`Plots`](https://docs.juliaplots.org/stable/): we'll use this package to display coordinates along the image and add the scalebar
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You can install the necessary packages by running Julia, and typing `]` to enter Pkg-mode. Then: `add AstroImages Plots`.
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Alternatively, you can run `using Pkg; Pkg.add(["AstroImages", "Plots"])`.
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```
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## Loading the image
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We can use [`AstroImages.jl`](http://juliaastro.org/AstroImages.jl/dev/) to load the image.
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We can use [`AstroImages.jl`](http://juliaastro.org/AstroImages/stable/) to load the image.
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```julia
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using AstroImages
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```
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Wow, that's over 120 megapixels!
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AstroImages will fall back to downscaling it automatically before displaying it using [`ImageTransformations.restrict`](https://juliaimages.org/latest/function_reference/#ImageTransformations.restrict), but let's make our lives simpler and just use every 10th pixel:
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AstroImages will fall back to downscaling it automatically before displaying it using [`ImageTransformations.restrict`](https://juliaimages.org/stable/function_reference/#ImageTransformations.restrict), but let's make our lives simpler and just use every 10th pixel:
Since we didn't put a semi-colon, the image was displayed. This works automatically if you use the VS Code editor, Jupyter notebooks, or Pluto Notebooks. If you're using a terminal, you can use [ElectronDisplay.jl](https://github.com/queryverse/ElectronDisplay.jl) or [ImageView.jl](https://github.com/JuliaImages/ImageView.jl) to open an interactive window.
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[`imview`](http://juliaastro.org/AstroImages.jl/dev/api/#AstroImages.imview) is the function that was called automatically to display the image, but we can call it ourselves if we want to customize the display.
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[`AstroImages.imview`](@extref) is the function that was called automatically to display the image, but we can call it ourselves if we want to customize the display.
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We can make the image pop a little more by adjusting the display limits, or `clims`. These can be either a tuple of min and max values (i.e. `(0.0, 100.0)`) or a function to calculate them for us based on some criteria. We'll adjust the limits to remove the top and bottom 1% of all pixels:
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```julia
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This shows that the coordinate type for the first axis is "RA---TAN".
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Now, we'll combine AstroImages with the [Plots.jl](https://docs.juliaplots.org/latest/) library to display these coordinates.
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Now, we'll combine AstroImages with the [Plots.jl](https://docs.juliaplots.org/stable/) library to display these coordinates.
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Full documentation for the `implot` function is available in the [AstroImages.jl docs](http://juliaastro.org/AstroImages.jl/dev/api/#AstroImages.implot).
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See [`AstroImages.implot`](@extref) for full documentation.
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## Adding a Scalebar
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To save the image, just run `savefig("output.png")`. `pdf`, `svg`, and other file formats are also supported.
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To learn more about displaying images and world coordinates, see the [AstroImages.jl documentation](http://juliaastro.org/AstroImages.jl/dev/).
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To learn more about displaying images and world coordinates, see the [AstroImages.jl documentation](http://juliaastro.org/AstroImages/stable/).
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For more on plotting in general, see the [Plots.jl documentation](https://docs.juliaplots.org/latest/).
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For more on plotting in general, see the [Plots.jl documentation](https://docs.juliaplots.org/stable/).
Copy file name to clipboardExpand all lines: docs/src/tutorials/tabular-data.md
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## Packages
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*[`FITSIO`](http://juliaastro.org/FITSIO.jl/stable/): we'll use this package to load a table stored in a FITS file
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*[`FITSIO`](http://juliaastro.org/FITSIO/stable/): we'll use this package to load a table stored in a FITS file
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*[`DataFrames`](https://dataframes.juliadata.org/stable/): we'll use this package to examine and manipulate the table
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*[`Plots`](https://docs.juliaplots.org/latest/): we'll use this package to visualize the contents of the table
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*[`AstroLib`](https://juliaastro.org/AstroLib.jl/stable/): general utility package. We'll use a helper function to compute a map projection.
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*[`Plots`](https://docs.juliaplots.org/stable/): we'll use this package to visualize the contents of the table
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*[`AstroLib`](https://juliaastro.org/AstroLib/stable/): general utility package. We'll use a helper function to compute a map projection.
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You can install the necessary packages by running Julia, and typing `]` to enter Pkg-mode. Then: `add FITSIO DataFrames Plots AstroLib`.
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Alternatively, you can run `using Pkg; Pkg.add(["FITSIO", "DataFrames", "Plots", "AstroLib"])`.
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The table in question is hosted alongside the [article](https://iopscience.iop.org/article/10.3847/1538-4365/abf93c). Go to Table 4 and click the link at the bottom to download it in FITS format. You'll need to uncompress the archive to see the `HGCA_vEDR3.fits` file.
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FITS tables can be loaded using the [FITSIO](http://juliaastro.org/FITSIO.jl/stable/) package or the [AstroImages](http://juliaastro.org/AstroImages.jl/dev/) package which wraps it.
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FITS tables can be loaded using the [FITSIO](http://juliaastro.org/FITSIO/stable/) package or the [AstroImages](http://juliaastro.org/AstroImages/stable/) package which wraps it.
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## Loading the table
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```
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Let's improve this plot by using a different map projection. We can make this conversion using [AstroLib.jl](https://juliaastro.org/AstroLib.jl/stable/).
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Let's improve this plot by using a different map projection. We can make this conversion using [AstroLib.jl](https://juliaastro.org/AstroLib/stable/).
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The function [`aitoff`](https://juliaastro.org/AstroLib.jl/stable/ref/#AstroLib.aitoff-Tuple{Real,%20Real}) takes longitude and latitude (or in this case, right-ascension and delcination) and returns a new position using an Aitoff projection.
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The function [`AstroLib.aitoff`](@extref) takes longitude and latitude (or in this case, right-ascension and delcination) and returns a new position using an Aitoff projection.
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```julia-repl
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julia> using AstroLib
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We can save the plot using `savefig("myplot.pdf")`. `png`, `svg`, and other formats are also supported.
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For more on plotting in general, see the [Plots.jl documentation](https://docs.juliaplots.org/latest/).
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For more on plotting in general, see the [Plots.jl documentation](https://docs.juliaplots.org/stable/).
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