[OSM-dev] Interests in OSM data updates/JOSM 360 images viewer projects of GSoC

[Simon Poole]

Am 07.04.2022 um 22:17 schrieb Fan, Xinyi:
>
> Dear OSM developers,
>
>
> My name is Xinyi (Cynthia) Fan and I’m currently a senior undergrad 
> studying Computer Science and Math. I started to dive into OSM 
> mid-March and learned to use JOSM to contribute my edits in the 
> mapping. I become more interested in two of the GSoC projects about 
> OSM data updates and JOSM image viewer, and would like to get into 
> contact with the mentors to discuss my understanding and procedure.
>
>
> Project: Improve mapsplit offline OSM data updating support (SimonPoole)
>
>
> Thank you for providing the related API and codes. I would like to ask 
> if my understanding for the approach is correct. Are we writing an 
> algorithm to query the augmented diffs to all changes made and then 
> match them with the record from our dataset and using socket 
> connections to pass to the server/desktop/mobile. One question I have 
> is that when you mention directly updating the data from edits, how 
> often or how long in history should we query the API to update the 
> change?
>
Hi Xinyi


Thank you for your interest. I can't comment on the JOSM project, but 
here's my take on the mapsplit related work:


The main focus should be on the update mechanism, how we retrieve the 
diffs in the end is a smaller issue (for conventional diffs this already 
exists, and I'm fairly sure the same applies for augmented diffs too).


An initial short exploratory phase will be needed to determine which 
approach to take for the update process, as there are a couple of 
variants that all have their pros and cons:


- use conventional diffs and build an index of the tiles that need to be 
updated by scanning all tiles in a first pass (disadvantage of that is 
clear, but the diff format is far simpler)

- use overpass augmented diffs (main disadvantage is the complexity of 
the diff format that does far more than what we really require)

- use a new simpler diff format (https://xkcd.com/927/ issue)


though the above would seem to way in the favour of using augmented 
diffs, I think a case can be made to take the time to check that our 
assumptions are correct.


Simon


>
> Project: Creating the high resolution image viewer for 360 images 
> (GhostFoxSledgehammer)
>
>
> Thank you for providing the related material. I read through the 
> material you provided and want to ask about the goals we want to 
> achieve. Are we aiming to create a filter similar to what GIMP does to 
> create a high resolution panorama, and then allowing user to zoom in 
> to view the image? Also, are we also making sure that the types of 
> panorama we created will be accepted and displayed properly by JOSM? I 
> would also appreciate if you can guide me a little through what should 
> be my major input in this project.
>
> Thank you so much for reading my email and I l am looking forward to 
> hearing back from you!
>
> Best,
>
> Cynthia
>
>
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