[PROJ] Greek geoid model 2023

[Nikolaos Ves]

> BTW, I do not know that do you mean with epsg:27000 (there is no such a
crs).
sorry; iam working in the UK atm so got a bit confused. Meant to say
*epsg:2100* (https://epsg.io/2100)

Have not been involved in 3D measurements for a very long time so my
vertical knowledge is a bit rusty, but the name rings some bells.

I'll try to ask around, but my feeling is as above: they are trying to keep
it dynamic, and for each big project they declare technical specifications
according to their needs but the final deliverables should always be
transformed epsg/2100 (EGSA'87 or GGRS87 or Greek Grid); which we can say
currently and for the foreseeable future is the de facto coordinate system
of greece.

n


On Tue, Apr 9, 2024 at 10:46 AM Javier Jimenez Shaw <j1 at jimenezshaw.com>
wrote:

> Hi Nikos
>
> Thanks for your answer.
> Yes, more digging would be really appreciated. Every country and agency
> works different... and also they change along time.
>
> In Greece there is a vertical CRS  in EPSG, "Piraeus-heigh"
> https://epsg.org/crs_5716/Piraeus-height.html
>
> BTW, I do not know that do you mean with epsg:27000 (there is no such a
> crs).
>
> Cheers
> Javier.
>
> On Mon, 8 Apr 2024, 17:54 Nikolaos Ves, <vesnikos at gmail.com> wrote:
>
>> Hi Javier,
>>
>> This is an interesting one; I have not found a law that declares
>> the official Greek coordinate system as the one described at epsg:27000.
>> Interestingly enough at this moment, greece is trying to complete it's
>> cadastre, and as a basis to it,  everything is using the GRS80 ellipsoid
>> as well.
>> My take is that if this one was developed by the Hellenic Military
>> Geographical Service, we could very well start seeing it being used for
>> applications in the mid/far future, but for now it's not used in any
>> official civil projects that I am aware of.
>>
>> Happy to dig a bit more to find a more authoritative answer somewhere if
>> that is not sufficient,
>> Let me know,
>> Nikos
>>
>> On Mon, Apr 8, 2024 at 4:14 PM Javier Jimenez Shaw via PROJ <
>> proj at lists.osgeo.org> wrote:
>>
>>> Hi
>>>
>>> I found recently that there is a new geoid model in Greece "HELLAS GEOID
>>> 2023" (HG2023)
>>>
>>> https://www.researchgate.net/publication/372604538_Geoid_model_determination_for_the_Hellenic_area_Hellas_Geoid_2023
>>>
>>> In case it is the official one in Greece, it would be nice to include it
>>> in PROJ (and EPSG).
>>> Has anybody here contacts in Greece? I already wrote a couple of emails
>>> to the authors, but probably I ended up in the spam folder. No useful info
>>> in the webpage (or I couldn't find it).
>>>
>>> Thank you.
>>>
>>> Regards,
>>> Javier.
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>>
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