[SoC] [GRASS-dev] ​GSoC 2018 report week 01 - GRASS GIS module for Sentinel-2 cloud and shadow detection

[Roberta Fagandini]

Ciao Stefan!

2018-05-20 21:44 GMT+02:00 Stefan Blumentrath <Stefan.Blumentrath at nina.no>:

> Ciao Roberta,
>
> Thanks for the comprehensive report!
>
> One general hint: Even if the drawback is complex expression(s) I would
> suggest merging r.mapcalc calls. That can improve performance quite a bit
> (less data read and written) and reduces the need to manage temporary data.
>
> See also: https://grass.osgeo.org/
> <https://grass.osgeo.org/grass74/manuals/r.mapcalc.html#multiple-computations>
> grass74
> <https://grass.osgeo.org/grass74/manuals/r.mapcalc.html#multiple-computations>
> /manuals/r.mapcalc.html#multiple-computations
> <https://grass.osgeo.org/grass74/manuals/r.mapcalc.html#multiple-computations>
>
> If you don't need the first_... To fifth_... files later, I would even say
> everything in 3rd_procedure.py until r.to.vect could be solved in a single
> mapcalc operation...
>

Thank you so much for your hints! I'm trying to clean up the code without
creating a too complex expression..I hope to share the new version by this
evening or tomorrow at the latest.


>
> Kind regards and again thank for your GSoC work,
> Stefan
>
>
Thanks again!!
Roberta


>
> ------------------------------
> *From:* grass-dev <grass-dev-bounces at lists.osgeo.org> on behalf of
> Roberta Fagandini <robifagandini at gmail.com>
> *Sent:* Sunday, May 20, 2018 4:33:57 PM
> *To:* soc at lists.osgeo.org; GRASS developers list
> *Subject:* [GRASS-dev] ​GSoC 2018 report week 01 - GRASS GIS module for
> Sentinel-2 cloud and shadow detection
>
> Hi all!
> I'm Roberta Fagandini and I'm working on my GSoC project, a GRASS GIS
> module for Sentinel-2 cloud and shadow detection.
> This is my report for the first week of coding.
> Since my progress has been a bit faster than expected I have already
> discussed with my mentors about further additions to the project. Therefore
> I have already updated my wiki page [0] changing the timeline. In this way,
> I will be able to release a more complete module.
>
> *1) What did I complete this week?*
>
>    - Checked the prototype version of the algorithm for cloud and shadow
>    detection
>    - Tested it
>    - I better studied the documentation of the GRASS Python Scripting
>    Library and started coding the GRASS python script following the
>    workflow schema prepared during the bonding period [1]
>    - Coded the 'data preparation' phase
>    - Coded the clouds detection procedure
>    - Added this first part of python script to my GitHub repository [2]
>    - Discussed with my mentors about further additions
>    - Discussed with the community about testing phase. I received some
>    feedback and some developers stepped forward to help me in testing the
>    algorithm
>    - Shared progress with the community
>
> Unfortunately, I wasn't able to code on Thursday because of a PhD meeting
> with my supervisor.
>
> *2) What am I going to achieve for next week?*
>
>    - Finish the translation of the algorithm in a basic python script
>    adding the shadows detection procedure and the steps for checking and
>    cleaning the final outputs (see [1] for details)
>    - Improve the python script so as to have a "light" working python
>    script (manage temporary file, clean up the code, etc.)
>    - Test it and fix bugs
>    - Start implementing the GUI
>
> *3) Is there any blocking issue?*
> No at the moment.
>
> Best wishes,
> Roberta
>
> [0] https://trac.osgeo.org/grass/wiki/GSoC/2018/CloudsAndShadowsDetection
> [1] https://drive.google.com/file/d/1KYEKvNBurBFHw1xUTLjM0PW
> 80Z-7br81/view?usp=sharing
> [2] https://github.com/RobiFag/GRASS_clouds_and_shadows
>
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