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memory map elevation data question

 
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jonnyv
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Joined: Jul 21, 2008
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PostPosted: Sun Oct 05, 2008 3:50 pm    Post subject: memory map elevation data question Reply with quote

Would elevation data for OS 50k maps work with OS 25K maps ?

Thanks
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Frabble
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Joined: Mar 09, 2007
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PostPosted: Sun Oct 05, 2008 9:41 pm    Post subject: Reply with quote

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
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PostPosted: Sun Oct 05, 2008 10:44 pm    Post subject: Re: memory map elevation data question Reply with quote

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
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PostPosted: Mon Oct 06, 2008 3:39 pm    Post subject: Reply with quote

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
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PostPosted: Mon Oct 06, 2008 4:18 pm    Post subject: Reply with quote

What's wrong with the elevation data supplied with the 1:25k map?
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jonnyv
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PostPosted: Mon Oct 06, 2008 5:10 pm    Post subject: Reply with quote

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
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PostPosted: Mon Oct 06, 2008 5:23 pm    Post subject: Reply with quote

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?
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jonnyv
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PostPosted: Mon Oct 06, 2008 6:27 pm    Post subject: Reply with quote

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
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PostPosted: Mon Oct 06, 2008 6:51 pm    Post subject: Reply with quote

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.
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AllyCat
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PostPosted: Wed Oct 08, 2008 10:00 pm    Post subject: Reply with quote

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.
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ianhb
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PostPosted: Thu Oct 09, 2008 7:07 pm    Post subject: Reply with quote

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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