Brad, thanks – useful to know. So any occurrence of geographic coordinates in TMS should ideally be accompanied by a field in which to specify the Geodetic Datum used? Would I be right in thinking that, if the Geodetic Datum is known, coordinates could be recalculated to match other Geodetic Data?

Best wishes

Rupert

Rupert Shepherd, PhD FSA
Collection Information Manager
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Tel: +44 (0)20 7747 5921

From: The Museum System (TMS) Users [mailto:[log in to unmask]] On Behalf Of Brad Millen
Sent: 23 August 2017 15:26
To: [log in to unmask]
Subject: Re: Adding VIAF and other linked data references to Constituents

Hi:

Be aware of limitations using Geographic coordinates for locations. All coordinates must have a Geodetic Datum. If not, you get what is called “Datum Shift”. A NAD27 Decimal Latitude is slightly different than a NAD83 or even a WGS84. You can correct this but a lat and long may not plot properly for an address if a NAD83 is used on Google Maps, which is WGS84. A street address may be a block away and the distance from the equator will make that shift worse.




From: The Museum System (TMS) Users [mailto:[log in to unmask]] On Behalf Of David Lowe
Sent: 2017-08-23 10:14 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: Adding VIAF and other linked data references to Constituents

I think that sounds great. And while we're at it, every table describing a physical location should have a field for geo coordinates. I've had to commandeer the Remarks field for over 200,000 constituent addresses<http://pic.nypl.org/map/?address.AddressTypeID=*&address.CountryID=*&bbox=*&Nationality=*&gender.TermID=*&process.TermID=*&role.TermID=*&format.TermID=*&biography.TermID=*&collection.TermID=*&DisplayName=*&Date=*&mode=2>.


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