Re: sea level on maps

Finding/Owning French Property

sea level on maps

woody234 18/05/2008, 8:24
How do you find the sea level of your house in france using the michelin maps website, is it the numbers in red that are the sea levels or is it the blue numbers, im looking at deux sevres area

Re: sea level on maps

Tandem_Pilot 18/05/2008, 9:24
Usually marked by a triangle with the height in metres next to it (black print)

I can't see any blue numbers

Regards

Alex

Milton Keynes and the Haute Vienne

Re: sea level on maps

Iceni 18/05/2008, 9:48

Just open the window and look out - if you're at or below sea level you will soon know.

John Confused [8-)]

Di
How do I get MY free website?

Re: sea level on maps

ErnieY 18/05/2008, 11:26

You can find it on GEOPORTAIL

Select CARTES/Carte IGN on the left and then slide the opacity slider to the right. You then have a contour map on which spot heights are marked.

PS: Also gives you Northings and Eastings or SatNav coordinates Wink [;-)]

My doctor said one drink per day, I can live with that !

Re: sea level on maps

woody234 18/05/2008, 12:12
thankyou for replys, geoportail is very good, i wonder how they work out the sea level for a particuler village or town

Re: sea level on maps

cassis 18/05/2008, 12:34
I think it used to be calculated using differences in barometric pressure from a fixed point close to mean sea level (sea level itself varies, of course). Each country had its own location at which mean sea level was fixed. Now many agencies use radar measurements taken from the shuttle Endeavour in 2000.

http://srtm.usgs.gov/

Zoggy played guitar, jammin' good with Weird and Golly.

Lyrics copyright Sausage Music 2008

Re: sea level on maps

Clair 18/05/2008, 12:40

woody234 wrote:
thankyou for replys, geoportail is very good, i wonder how they work out the sea level for a particuler village or town

The IGN (Institut Géographique National) ihas "repères de nivellement" on public buildings and/or road sides.
You can see a map and find the nearest ones to your location (indicated by a yellow dot) here: http://geodesie.ign.fr/
(a long click on the hand tool brings a selection menu, go to the second option (Aller à...) and enter the name of your commune under field 1, choose a map scale and search)

More details (in French) here: http://www.ign.fr/telechargement/education/fiches/relief/R%C3%A9seaux_nivellement.pdf and here: http://www.ign.fr/telechargement/education/fiches/relief/Reperes_nivellement.pdf

Clair
Real Virtual French Person

Re: sea level on maps

Quillan 18/05/2008, 18:07

Re barometric pressure. Officially, as many aviators will know, the pressure is deemed to be 1013.2 millibars at sea level except when landing and taking off for obvious reasons. This is the 'magic number' that is used during flight for measuring height.

I was wondering if there was a specific reason the OP was asking. If it's because of flooding and building permission for instance there are other things that come in to play which is why you need a 'cut through' survey of the land to present to the DDE. This is then forwarded to have a computer model created. If its for something else then I appologise.

http://www.chambresdhote.com

Re: sea level on maps

Ian 19/05/2008, 16:32
Google World has a figure for height above sea level - just glide your cursor over the area and the numbers scroll by - likewise the northings and eastings.

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