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jonnyv Lifetime Member

Joined: Jul 21, 2008 Posts: 27
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Posted: Sun Oct 05, 2008 3:50 pm Post subject: memory map elevation data question |
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Would elevation data for OS 50k maps work with OS 25K maps ?
Thanks |
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Frabble Occasional Visitor

Joined: Mar 09, 2007 Posts: 51
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Posted: Sun Oct 05, 2008 9:41 pm Post subject: |
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It appears to - in that elevations were still displayed when I replaced the sample OS25 map qed file with the one for OS50 maps and renamed. I imagine that if the OS25 sections are covered in the OS50 file it should work.
What's the problem? |
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rothers Regular Visitor

Joined: Mar 28, 2007 Posts: 134
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Posted: Sun Oct 05, 2008 10:44 pm Post subject: Re: memory map elevation data question |
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jonnyv wrote: | Would elevation data for OS 50k maps work with OS 25K maps ? |
Yes, just check the "map/elevation data" menu to see what's being used.
Cheers
Neil |
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jonnyv Lifetime Member

Joined: Jul 21, 2008 Posts: 27
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Posted: Mon Oct 06, 2008 3:39 pm Post subject: |
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Thanks for the replys.
no problems, just got a 50k map and wondered if i bought the cheaper version of it in 25k would i be able to use the elevation data. |
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Darren Frequent Visitor

Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Mon Oct 06, 2008 4:18 pm Post subject: |
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What's wrong with the elevation data supplied with the 1:25k map? _________________ Darren Griffin |
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jonnyv Lifetime Member

Joined: Jul 21, 2008 Posts: 27
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Posted: Mon Oct 06, 2008 5:10 pm Post subject: |
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Darren wrote: | What's wrong with the elevation data supplied with the 1:25k map? |
I thought the cheaper version of the 25k maps just gave you the map and thats all ? |
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Darren Frequent Visitor

Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Mon Oct 06, 2008 5:23 pm Post subject: |
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Ah, I wasn't aware there was a cheaper 1:25 map option? Do you have any references as I can't see a two tier offering on MM's web-site? _________________ Darren Griffin |
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jonnyv Lifetime Member

Joined: Jul 21, 2008 Posts: 27
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Posted: Mon Oct 06, 2008 6:27 pm Post subject: |
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Darren wrote: | Ah, I wasn't aware there was a cheaper 1:25 map option? Do you have any references as I can't see a two tier offering on MM's web-site? |
I think its me thats confused, i thought there was a standard and premium package for the OS maps. |
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Darren Frequent Visitor

Joined: 11/07/2002 14:36:40 Posts: 23848 Location: Hampshire, UK
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Posted: Mon Oct 06, 2008 6:51 pm Post subject: |
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There are Standard and Premium versions for 1:50k. The Premium differs from standard in having aerial photography supplied in addition to the standard map data on the DVD. _________________ Darren Griffin |
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AllyCat Frequent Visitor

Joined: Feb 23, 2005 Posts: 376 Location: Catford, London, UK
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Posted: Wed Oct 08, 2008 10:00 pm Post subject: |
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Hi,
Somewhat surprisingly, the elevation data supplied with the 1:25k maps appears to be identical to that for the 1:50k, even though the former cost more than ten times as much per given area (and have twice as many contour lines).
Incidentally, the elevation data is not in the form of contour "vectors", but "spot heights" on a 50 metre grid. MM then interpolates intermediate values, so there can be some discrepancies between heights displayed and the contour lines or peak heights shown on the map (particularly in areas where there are large changes in the gradient of the land across a grid square).
Cheers, Alan. _________________ Garmin GPS72H/76/60/45, Etrex H, Mapsource v6.5.
Acer N50,HP114,Loox N560,Dell x50,CF/SD cards to 4/32GB.
RoyalTek,Holux236,Navman B10 & Copilot(Globalsat) BT GPS,TomTom5/6.
Memory Map (v5.4.2 & v5.1.3 OS & Euro), GPS gate,OSGPSconverter. |
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ianhb Occasional Visitor

Joined: Jan 05, 2005 Posts: 39 Location: UK
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Posted: Thu Oct 09, 2008 7:07 pm Post subject: |
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Guessing wildly; but I think that you might find that the height data originates from the OS LandForm Profile dataset, which is a 1:10,000 digital terrain model. The 1:50k and 1:25k maps are both rasters and therefore contain no inherant digital data.
Ian |
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