[mapguide-users] Issue with External Map Alignment in Version 14.10

[Jackie Ng]

Ok some more things to look at.

Yes, 0.14.10 no longer uses epsg.io, so it fetches the proj4 defn from
spatialreference.org

I did a check and found that epsg.io and spatialreference.org return *different
proj4 defns* for EPSG:2039

epsg.io (https://epsg.io/2039) gives this:

+proj=tmerc +lat_0=31.7343936111111 +lon_0=35.2045169444444 +k=1.0000067
+x_0=219529.584 +y_0=626907.39 +ellps=GRS80
+towgs84=23.772,17.49,17.859,-0.3132,-1.85274,1.67299,-5.4262 +units=m
+no_defs +type=crs

spatialreference.org (https://spatialreference.org/ref/epsg/2039/proj4.txt)
gives this:

+proj=tmerc +lat_0=31.7343936111111 +lon_0=35.2045169444444 +k=1.0000067
+x_0=219529.584 +y_0=626907.39 +ellps=GRS80 +units=m +no_defs +type=crs

It could be that the shift in 0.14.10 is because it now fetches a proj4
defn for EPSG:2039 from spatialreference.org which is missing the +towgs84
parameter

To see if this is the case, open the appdef in Maestro and edit the "Custom
Projections" and manually register the following:

EPSG Code: 2039
proj4 definition: +proj=tmerc +lat_0=31.7343936111111
+lon_0=35.2045169444444 +k=1.0000067 +x_0=219529.584 +y_0=626907.39
+ellps=GRS80 +towgs84=23.772,17.49,17.859,-0.3132,-1.85274,1.67299,-5.4262
+units=m +no_defs +type=crs

Doing this will bypass the spatialreference.org lookup and instead use
whatever you registered instead.

- Jackie


On Sun, 9 Mar 2025 at 05:48, Nimrod Cnaan <nimcnaan at gmail.com> wrote:

> במקרה כזה, כדאי להסביר את המצב הזה למנהל הפרויקט ולהציע חלופות אפשריות.
> הנה הצעה לתגובה שתוכל לשלוח:
> ------------------------------
>
> Hello,
>
> Thank you for your response.
>
> Unfortunately, I am unable to test previous versions (0.14.3 to 0.14.9)
> due to a change in EPSG support: the EPSG.io API endpoints, which we rely
> on for the EPSG:2039 projection,
>
> was deprecated on 01/02/25. As a result, these endpoints are no longer
> functional for me.
>
> Given this limitation, is there an alternative way to troubleshoot this
> issue?
>
> Would sharing my LAYOUT configuration help in diagnosing the issue?
>
> I appreciate your help and any guidance you can provide.
>
> Thank you in advance!
>
> Best regards,
> Nimrod Cnaan
> ------------------------------
>
> ההודעה הזו מסבירה את המגבלות שלך בצורה ברורה ומבקשת הצעות לפתרון חלופי. אם
> תרצה לערוך או להוסיף משהו, רק תגיד! 😊
>
> ‫בתאריך יום ג׳, 4 במרץ 2025 ב-12:08 מאת ‪Jackie Ng via mapguide-users‬‏ <‪
> mapguide-users at lists.osgeo.org‬‏>:‬
>
>> For starters, if something worked in 0.14.2 and "broke" in 0.14.10 can
>> you at least download all the releases in between (0.14.3, 0.14.4, ...
>> 0.14.9) and identify the first release where this stopped working. That
>> will at least help us narrow down the series of changes.
>>
>> - Jackie
>>
>> You wrote:
>>
>> Hello everyone,
>>
>> In previous version of *MapGuide-React-Viewer 0.14.2*, there was an
>> option to influence the position of the *external base map* by setting
>> the following in the *LAYOUT *to be compatible with the: (for example)
>> <projection>EPSG:2039</projection>
>>
>> With this setting, the external map aligned correctly with the map & base
>> map local coordinate\EPSG.
>>
>> This option doesn't seem to be working for the new version 0.14.10, it
>> seems there is no effect on the External Base Map's positioning, and there
>> is a misalignment between local layers and the external map background (See
>> attached pic). This creates an issue where the alignment between the map
>> and the data layers does not match.
>>
>> We are aware that changing the *Map *projection to *EPSG:900913* resolves
>> the shifting issue, but this introduces a problem with the map's coordinate
>> grid, and some of our clients are not willing to work with this coordinate
>> system.
>>
>> Is there a way to work around this issue in version 0.14.10?
>>
>> Looking forward to your thoughts and potential solutions.
>>
>> Thank you in advance!
>> _______________________________________________
>> mapguide-users mailing list
>> mapguide-users at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/mapguide-users
>>
>
>
> --
>
> בכבוד רב,
>
> *נמרוד כנען**   |   *גיאומינד שירותי GIS  –  פיתוח,  ייעוץ  ושירותי ענן
> ישיר: 048101268 | נייד: 0525355483 | nimrod at geomind.co.il
>
> נא בקרו באתר החדש שלנו http://geomind.co.il
>
>

-- 
http://themapguyde.blogspot.com
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