| Rohit Kumar

open-source (7)

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Technical-Writing (2)

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Final Report GSoC'19: The curtain Falls

Aug 23, 2019
3 minutes read

With over 2K+ lines of code, 3 repositories and countless discussions, Google Summer of Code 19 with OpenAstronomy (JuliaAstro) came to an end. The following is an attempt to summarize it in words (without the hard parts). Merged Pull Requests Reproject.jl: SLOC -> 586 (Reprojects (a type of image conversion) Astronomical Images from one world coordinate to another.) #1, #2, #3, #4, #5, #6, #7 AstroImages.jl: SLOC -> 1056 (Integration of Astronomical Images with popular Image and Plotting libraries in Julia.) #7, #9, #12, #14, #15, #16, #17, #18, #19, #20, #21, #22, #23, #24 AstroImageView.jl: SLOC -> 604 (A GUI based visualization of AstroImages) #1, #2, #3, #4, #5, #6 With this, I have completed all the things proposed before getting accepted into GSoC. Impact The amount of work done has integrated communities in Julia. Now JuliaAstro can work with JuliaImages, JuliaPlots, and JuliaGraphics. How we deal with astronomical images is different from how we deal with regular everyday images. The integration will now bridge and allow most of the methods coming from JuliaImages to be directly applicable to AstroImages. Plotting is always a great tool to visualize data. Now, with the custom plotting recipes integrated into AstroImages, users can visualize astronomical images on astronomical scales.......

Week 9-10 at JuliaAstro

Aug 10, 2019
3 minutes read

List of Milestones achieved Interpolator tweak #6 Multi File Support #21 ccd2rbg function #15 data matrix and WCSTransform tuple type parser #7 Support for RGB #22 Basic UI panel for AstroImages #3 Interpolator tweak #6 This patch to Reproject.jl was due to some realizations I had upon Mosè Giordano stressing over the fact that I should use isapprox rather than check_diff (my custom test method) in ccd2rgb PR. I realized that there was something at fault and after investigation, I found that there was a custom method of map_coordinate in original reproject of python version which I didn’t understand at that time and left it (as on large scale both gave same results). It created some differences on the edges of images reprojected. So after many hours of figuring out the trick they used, the check_diff was replaced by isapprox along with a tweak to the interpolator. Multi File Support #21 This PR was completed a long time ago but it’s build was failing on appvyeor viz. Windows build. I too along with my mentor was confused at first because Travis (Linux and Mac) build were all green and the logs in appvyeor were also non-sensical.......

Second Evaluation: 2 months into GSoC

Jul 23, 2019
2 minutes read

I thought the first month will be the toughest as there lies the trickiest part of the project. But guess what, the second month proved otherwise. But that’s the reality of GSoC, right? Until you have faced the challenges at least once, you won’t grow better to face it the next time. I am glad of the learning experience GSoC has given me. I used to think coming into OSS has improved my skill a lot but now I can see how much still I have to perfect myself. The following is the experience of the 2nd month of my GSoC project. What things I achieved before my second evaluation? 1. Plotting Interface for AstroImage This involved writing a custom recipe for plotting AstroImages. Now using plot(img, header), users can display the world coordinates of AstroImages in the plot itself. 2. Image Interface for AstroImage Adding image interface required AstroImage package to fortify with many small features. But the toughest part was to maintain the performance and write code in a type stable manner. I got to know about mutiple dispatch from my mentor and how Julia is utilizing it to make everything faster and efficient. Additions for Image interface: * Multi Image support #19 * Multi WCS support #20 * Multi File support #21......