Why surveyors should use up-to-date data!
We’ve been telling you about the campaign we are running to encourage land and property professionals such as surveyors, conveyancers, architects and developers to ensure they are licensed and up-to-date when they use location data. The campaign is supported by RICS, Land Data, FAST and other leading industry figures and features a series of filmswhich explain why it’s important.
In the final of the three films aimed at the Land and Property sector, RICS’ Land Director, James Kavanagh explains why he believes that up-to-date data offers chartered surveyors peace of mind that they can offer the best service to their clients. In short, they need to understand how up-to-date, licensed data plays an important role in maintaining their professional reputation. Professionals who have any doubts about whether their location data licence is up-to-date should contact their data supplier or Ordnance Survey directly for guidance.
GI explained, Uncategorized
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campaign, land and property, licensed data, RICS, surveyors, up-to-date
Themocracy
As a supplementary question – should the vertical also be considered as needing to be up-to-date?
My understanding is that a “corrector surface” OSGM10 has already been developed to link with an improved “geoid model” OSGM05 gifted by the Danes about 7 years ago but to date nothing appears to be publicly available. It was indicated previously that it would be introduced in early 2011. It would appear that just as horizontal accuracy improvements were required for mapping it seems probable that with the increased flooding risk a similar vertical accuracy improvement may also be required and of benefit. I am at a loss to understand the very delayed reaction to a worthwhile change and improvement but is the corrector surface approach the right answer?
Not sure if my first comment got through or if it was too technical a question.
Hi David – yes it got through. As we moderate the blog posts Monday to Friday, 9.00 am to 5.00 pm it didn’t make it through for approval until this morning. It’s certainly a tough question – I’ll speak to some colleagues and get back to you.
Thanks, Gemma
Hi David
I’ve tracked the answer down for you. This topic is a little more technical than we would usually come across on the blog which is aimed at more general GI, geography and mapping topics. If you have any follow-up questions, the best point of contact is customerservices@ordnancesurvey.co.uk as my colleagues are on hand to deal with the more technical queries.
However, in response to your query, the current height corrector surface between ETRS89 and Ordnance Datum is OSGM02. An improved geoid model OSGM05, which encompasses additional satellite gravimetry data, has indeed since been produced and this has led us to commission a new height model to replace OSGM02. This new model was intended to be published as OSGM10 however the release has been delayed due to the need for additional work in refining the fitting of the gravimetric geoid to the orthometric height data. We are also looking at possible options in the long term approach to realising and defining heights in GB and intend to provide more information when we release the successor to OSGM02, hopefully in the next few months.
Kind regards
Gemma
Hi Gemma,
Thanks for accepting the challenge and getting an answer.
A final thought – Should Surveyors use up-to-date data in only 2 dimensions or in today’s world should they be thinking in 3 dimensions?
No answer required.
Best regards
David