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Thread: POI file for Trig Points

  1. #1

    Default POI file for Trig Points

    Updated to include details of stonebuilt pillars.

    This will probably be the last update for quite a while, barring some unexpected discovery. I've run out of things to add to it!

    Requests welcome.
    Last edited by agentmancuso; 9th September 2009 at 09:26 PM.

  2. #2
    Sagina nivalis Guest

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    Thanks Bernie. Yes it's about time someone found / refound a few pillars.

  3. #3

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    Trig Points POI file updated today to include some recent status changes & Rob's discoveries in the Hebrides.

  4. #4

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    Updated today to include all 40 Project Emily trigs, plus a couple more stations in the Hebrides & a few status changes.

  5. #5
    Sagina nivalis Guest

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    Quote Originally Posted by agentmancuso View Post
    Trig Points POI file updated today to include some recent status changes & Rob's discoveries in the Hebrides.
    Thanks Bernie. I'll try it out later - when the rain stops

    Finding new trigs via the OS trig archive (as with my Kilda exercise) seems a bit longwinded currently. Is it possible to download the whole database and be done with it? Best I can see is to download as spreadsheet, one LR at a time, which is still 204 sheets, but might be a job for a rainy day (!)

  6. #6

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    Quote Originally Posted by Sagina nivalis View Post
    Is it possible to download the whole database and be done with it? Best I can see is to download as spreadsheet, one LR at a time, which is still 204 sheets, but might be a job for a rainy day (!)
    The problem with that approach is that it only downloads one screen's worth at a time - i.e each page comes as a separate .xls, not each LR. Or at least it did last time I tried. I'll have another look.

  7. #7
    Sagina nivalis Guest

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    (from the St Kilda trigs thread)

    Quote Originally Posted by agentmancuso View Post
    the end result would be (more or less? or exactly?) the OSDB Trig Archive now available in two formats at trigonomy.
    I'd forgotten about that! All 31,467 of em (I wonder if it has changed at all since 2007).

    That would seem to fit the bill. Another POI file in the making?

    Incidentally, I couldn't find Castor FBM Aux 1 on the Passive DB nor the Trig archive. Am I missing something?
    Last edited by Sagina nivalis; 1st November 2009 at 11:07 AM.

  8. #8

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    Quote Originally Posted by Sagina nivalis View Post
    I'd forgotten about that! All 31,467 of em (I wonder if it has changed at all since 2007).

    That would seem to fit the bill. Another POI file in the making?
    I did consider it for a while, but have resolved to hold firm against temptation. I had a good look at LR64 (my homesheet) and decided that as the vast majority were either destroyed or just to ugly to attempt (buried blocks, factory roofs, that sort of thing) it would not be worth the trouble.

    On the other hand, I am quite happy to add certain defined areas like St Kilda or whatever where there is any likelihood that anyone will try to find the stations.


    Incidentally, I couldn't find Castor FBM Aux 1 on the Passive DB nor the Trig archive. Am I missing something?
    Here it is. The problem is probably that it appears under Passive Station number H1TL1398, rather than the H2TL1399 quoted on T:UK.

    The explanation for for this (and other similar) discrepancies was provided by someone a while back - Rod S, or Ian Wilson probably. It goes roughly thus: the H2 originally related to a station being the second passive within the Km square. But sometimes, though very close to an earlier passive, the second station was actually in a different square. At some point all the stations to which this applied were renumbered as H1 in the square they were actually situated in. But as is the way with these things the old labels stubbornly refused to wither & die as intended, and have been perpetuated by the T:UK database picking up the old labels.

  9. #9
    Sagina nivalis Guest

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    Quote Originally Posted by agentmancuso View Post
    I did consider it for a while, but have resolved to hold firm against temptation. I had a good look at LR64 (my homesheet) and decided that as the vast majority were either destroyed or just to ugly to attempt (buried blocks, factory roofs, that sort of thing) it would not be worth the trouble.

    On the other hand, I am quite happy to add certain defined areas like St Kilda or whatever where there is any likelihood that anyone will try to find the stations.
    Might be better (and easier?) to simply do a new POI of the whole DB rather than clutter up the main one with all sorts of stuff which is of limited interest for the reasons you describe. I have to say I'm no great fan of rivets etc, except maybe local to home (LR142).


    Here it is.
    But no sketch apparently! No matter, it's been dug and is now dimensioned on T:UK, so should be findable in future.

    Anyway, how come it doesn't come up in a search for Passives within 5km of the relevant GR i.e. TL130980? It seems to be in limbo.

  10. #10
    RodS Guest

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    Here it is. The problem is probably that it appears under Passive Station number H1TL1398, rather than the H2TL1399 quoted on T:UK.

    The explanation for for this (and other similar) discrepancies was provided by someone a while back - Rod S
    Indeed it was me.

    It goes roughly thus: the H2 originally related to a station being the second passive within the Km square. But sometimes, though very close to an earlier passive, the second station was actually in a different square. At some point all the stations to which this applied were renumbered as H1 in the square they were actually situated in. But as is the way with these things the old labels stubbornly refused to wither & die as intended, and have been perpetuated by the T:UK database picking up the old labels.
    But the sketch for Castor FBM Aux 1 got left behind at http://gps.ordnancesurvey.co.uk/stat...f/H2TL1399.gif

  11. #11
    Sagina nivalis Guest

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    Thanks Rod. I've added the sketch link to the log. I never seem to get quite the same dimensions as OS sketches even when I use a tape!

  12. #12
    RodS Guest

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    Quote Originally Posted by Sagina nivalis View Post
    Thanks Rod. I've added the sketch link to the log. I never seem to get quite the same dimensions as OS sketches even when I use a tape!
    On this sketch, as on many others, dimensions are given from road signs, which have a habit of moving. Fence posts are not much more reliable!

  13. #13
    Sagina nivalis Guest

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    Quote Originally Posted by RodS View Post
    On this sketch, as on many others, dimensions are given from road signs, which have a habit of moving. Fence posts are not much more reliable!
    Ditch-end and road edge should stay put though?

  14. #14

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    Quote Originally Posted by Sagina nivalis View Post
    Ditch-end and road edge should stay put though?
    This ditch end didn't. So much undergrowth that in effect the ground surface had shifted a good few inches.

  15. #15
    Sagina nivalis Guest

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    Quote Originally Posted by agentmancuso View Post
    This ditch end didn't. So much undergrowth that in effect the ground surface had shifted a good few inches.
    Congrats for finding - also for your Donalds completion

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