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24/05/2008, 8:26 woody234 Joined on 16/02/2008 parthenay 79 Posts 196 Re: sea level on maps so ive checked geoportail and I think the sea level is 204 metres for vernoux en gatine deux sevres, do you think this is correct    Report

24/05/2008, 11:05 Mik from LA Joined on 03/09/2006 Haute Garonne Posts 46 Re: sea level on maps The contours shown on the Geoprtail site give heights of contours at 5 metre intervals. (i.e. height difference between contours is 5 metres). Every 25 m  contour (e.g. 100; 125; 150; 175) is labelled somewhere along its length. To get your exact height simply interpolate between contours. In your case the position you want to height should be 4/5 ths of the distance from the 200 metre contour (which should be labelled somewhere) towards the 205 metre contour). There is a 200 metre contour wandering around your village so my guess is that you are correct. If you want me to check this for you, go to Geoportail or Google and place the cursor over the position you want the height of. Read off and send me the lat and long of that position and e-mail or pm me the results and I will confirm the height. These heights were established by IGN (French equivalent of Ordnance Survey) and are relative to observations of mean sea level at Marsaille averaged over something like a 10 year period at the end of the 1800's. As has been said, it depends on what you need the height information for. Observations of height from GPS, as used in Google for example, use a different  reference spheroid so will be slightly different from those shown on IGN maps. In practise you are usually only interested in differences in height so as long as you only use one system (GPS or IGN) you will get a useable result. Mik    Report

24/05/2008, 11:20 Quillan Joined on 23/08/2004 Forum Moderator Posts 3,912 Re: sea level on maps I thought I might add that if you want to know the height for any official reason get a geometric to measure it for you. I say this having had a CU turned down initially because the plot was 28cm below the flood line. Simple enough to deal with as the plot is at an angle, just move the location on the plot or add a mound. They do work down to exact centimeters for this sort of thing. If its just for 'fun' or curiosity then by all means use the systems given below. http://www.chambresdhote.com    Report

24/05/2008, 12:02 woody234 Joined on 16/02/2008 parthenay 79 Posts 196 Re: sea level on maps I need the height level because sea levels are going to rise by 7 metres when the ice caps melt so the low laying lands will probably be flooded     Report

24/05/2008, 13:06 powerdesal Joined on 07/01/2006 Fujeirah, U.A.E Posts 2,239 Re: sea level on maps Do you have a timescale ? Steve Fujeirah Emirate, U.A.E + 50 (in France) ...........................................................................    Report

24/05/2008, 14:02 Chris'nJulie Joined on 10/07/2007 Correze Posts 129 Re: sea level on maps Woody234, I hope you're not serious about the melting of the ice caps!  Water-borne ice melt will make absolutely no difference to sea levels (Arctica), and whilst in some areas in Antarctica land-borne ice  may be melting, it is thickening in others, and probably cancelling out any possible sea level change. Chris Chris & Julie Blimey, what have we done?    Report

24/05/2008, 16:26 Mik from LA Joined on 03/09/2006 Haute Garonne Posts 46 Re: sea level on maps Woody. It is not just a case of adding 7 metres to mean sea level to see which parts are affected. You must add the highest astronomical tide to the height of mean sea level then allow a bit more for weather variations. But don't worry, nowhere within many miles of Vernoux en Gatine is threatened by rising sea levels. Quillan, that is very interesting. In UK the EA publish flood plain maps. Do you know if the same thing is available here?    Report

24/05/2008, 17:28 Quillan Joined on 23/08/2004 Forum Moderator Posts 3,912 Re: sea level on maps  Mik from LA wrote: Quillan, that is very interesting. In UK the EA publish flood plain maps. Do you know if the same thing is available here? Yes they do and I think there is a website you can visit. You should also be able to get a copy from your mayors office or the DDE office but it's only a rough guide. If you live near any water you will have to have a survey done which is passed on to the DDE who in turn pass it on to another department who run a computer model. I did ask the DDE for the heights but it is like extracting blood from a stone. It's probably to do with the French way of thinking as in somebody gives you a figure and you put your application in and it's refused. You then say 'hang on a minute Mr Bloggs said the height was XXX and my house will be above it' and then it all gets complicated. http://www.chambresdhote.com    Report

25/05/2008, 7:52 ErnieY Joined on 05/12/2006 W of Cahors (46) Posts 4,151 Re: sea level on maps  woody234 wrote: I need the height level because sea levels are going to rise by 7 metres when the ice caps melt so the low laying lands will probably be flooded  Woody, I'm sure a great many of us would be very interested in either the source or the recipe for whatever elixir you're taking to ensure your survival until this event happens (if ever that is)   My doctor said one drink per day, I can live with that !    Report

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