[PROJ] More about transformations web wasm-proj

[Nick Mein]

Hey Javier,

I was really pleased to discover wasm-proj last week! I'd actually been
looking for something exactly like that the week before. My use-case is
comparing the results produced by Proj with those produced by our own
internal library. I'm pleased to report that (given a sample of one point
in one CRS :-) they match exactly.

Best regards,
Nick.

On Thu, 16 Apr 2026 at 06:16, Javier Jimenez Shaw via PROJ <
proj at lists.osgeo.org> wrote:

> Hi all
>
> I have been improving the webpage to perform coordinate transformations
> with PROJ
> https://jjimenezshaw.github.io/wasm-proj/
>
> One of the improvements is the usage of your own proj.db or auxiliary
> databases.
>
> As you may remember last year I made an auxiliary database for PROJ with
> the beta data published in June 2025 for the modernized NSRS in USA
> (NATRF2022 and friends)
> https://github.com/jjimenezshaw/NSRS-2022-PROJ
>
> You can combine both things to directly run transformations with the
> modernized NSRS.
> To avoid the work of downloading the file nsrs_proj.db, it can be
> specified in the URL with this extra option:
> https://jjimenezshaw.github.io/wasm-proj/transform.html?nsrs_aux_db=1
>
> That loads automatically the auxiliary database mentioned above. Easy!
>
> In this link you can see how both the vertical and horizontal coordinates
> are transformed.
>
> https://jjimenezshaw.github.io/wasm-proj/transform.html?nsrs_aux_db=1&st=combo&tt=combo&sh=EPSG%3A9989&th=NSRS%3ANATRF2022_2D&tv=NSRS%3ANAPGD2022&p3d=1&net=1&coords=35+-100+0+2026.3
>
> There is also a new section to compute "Distortion Factors". Probably too
> niche, but I had fun doing it. Enjoy it.
>
> (Have you seen the section "Last Operation Summary" at the bottom of the
> transformer? It is useful to understand what happened exactly)
>
> No trackers, no ads, no monitoring of user activity. Open Source.
>
> Best regards,
> Javier
>
>
>
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