[PROJ] More about transformations web wasm-proj

[Javier Jimenez Shaw]

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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