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Add conversion for Thailand system "47Q" #64

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BTHOM opened this issue Jan 24, 2016 · 2 comments
Open

Add conversion for Thailand system "47Q" #64

BTHOM opened this issue Jan 24, 2016 · 2 comments

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@BTHOM
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BTHOM commented Jan 24, 2016

Bonjour,
Je n'ai pas trouvé dans l'utilitaire de conversion, le système de référence pour la Thaïlande ; par exemple celui qui permet de transformer les coordonnées "47Q" indiquées sur le site "Caves and Caving in Thailand" : http://www.thailandcaves.shepton.org.uk/caves1
Merci

@BTHOM BTHOM closed this as completed Jan 24, 2016
@BTHOM BTHOM reopened this Jan 24, 2016
@ClemRz
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ClemRz commented Jan 28, 2016

Salut Bernard,

Je pense que 47Q est la référence dans la grille ou sur la carte où se trouvent les coordonnées.
J'ai contacté l'auteur du site web pour avoir plus de renseignements.
Je te tiens au courant.

@ClemRz
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ClemRz commented Jan 28, 2016

Hi Clement

Most of the co-ordinates are UTM on the WGS84 datum. This includes the KMZ file.

However, as with Tham Sampeng, some of the older surveys are UTM on the Indian 1954 (Thailand-Vietnam) datum.
Thai 1:50,000 topographic maps were on this datum, before changing to WGS84 about 10 years ago.

The datum is given on all the surveys.

Regards,

Martin

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