OSGB OSTN15 supported?

veddycent

Hi all,

I'm currently using v20.1 and wondering whether GM is using OSTN02 or OSTN15 for OSGB36 transforms?

I came across the same question on here from 2018 but doesnt have a response so I'm asking again.

Any help would be much appreciated.
Regards
V

bmg_bob

Hello,

Support for OSTN15 was added in Global Mapper 22.1, which is available now.

Cheers,
Bob

veddycent

To add to the above. I imported a KMZ which has been exported from Arc using NTv2 OSTN02 and loaded into GM with the original SHP and a KMZ exported from GM.

The SHP and KMZ from GM matched perfectly but the KMZ from ArcGis did not. I assume its because Arc is using a newer projection than GM.

Is there any way to add the newer projection to GM?

Any help would be much appreciated.
Regards
V

VincentR

I do support the request of @veddycent to embed the NTv2 OSTN15 transformation in GM (this is widely used nowadays).

OSTN15 transformation (OSGB36 to ETRS89 NTv2 version) has EPSG code 7709, Ordance Survey has published a toolpack for developers on their site:
https://www.ordnancesurvey.co.uk/business-government/tools-support/os-net/for-developers)

bmg_bob

Hello,

We have an open feature request (GM-6663) to add support for the OSTN15 transformation. I have added your information to the feature request and bumped up the number of users requesting this. Thank you.

Cheers,
Bob

VincentR

Much appreciated, thanks!

Gillian

Please add myself to the OSTN15 user request list!

Gillian

When I re-project from WGS84 to OSTN15 using either the OS GridInquest II software, or my Trimble software, I get a result thats within 2mm of each other. When I try this with the Global Mapper demo my result is more than a metre out.