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  1. #1
    Join Date
    Jul 2023
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    23

    Default Old Maps Vs Google Earth

    Hi, I am trying to superimpose a clip from Google Earth on an 18nth century map. Unfortunately the old mapmaker appears to have used a different scale for the vertical sense to the horizontal. I'm sure that this must be easy but how do I compress the map in the vertical sense without shrinking the horizontal? Any ideas ? E

  2. #2
    Join Date
    Aug 2000
    Location
    Placitas, New Mexico, USA
    Posts
    41,458

    Default Re: Old Maps Vs Google Earth

    There is a small (Lock Aspect Ratio) padlock icon on the Infobar at the top of the page. It should be in the unlocked position.

    Also, right click on the padlock icon and make sure Smart Transform is not selected.
    Gary W. Priester
    Mr. Moderator Emeritus Dude
    , Sir

    gwpriester.com | eyetricks-3d-stereograms.com | eyeTricks on Facebook






  3. #3
    Join Date
    Feb 2007
    Location
    UK
    Posts
    21,238

    Default Re: Old Maps Vs Google Earth

    whilst google earth uses a variant of the mercator map projection, it is one designed for the web - so it may still need some tweaking, as an 18th century [1700's] map, even if it is mercator, may well be different

    larger the area the greater the divergence if so

    something to be aware of ....
    -------------------------------
    Nothing lasts forever...

  4. #4
    Join Date
    Apr 2012
    Location
    SW England
    Posts
    17,635

    Default Re: Old Maps Vs Google Earth

    So it is probably one of vertical scaling as @gwpriester put it - https://en.wikipedia.org/wiki/Histor...y_developments.

    Which are you trying to change old or Google?

    Acorn
    Acorn - installed & active Xara software: Cloud+/Pro+, XDPXv18 , XWDPv12/v15, XPGDv10, X3D7, Xara Xtreme 5, and others back through time (to CC's Artworks).
    Technical remediation and consultancy for your web designs. TG Nuggets you might like. Report faults: Xara Cloud+/Pro+/Magix Legacy; Xara KB & Chat

  5. #5
    Join Date
    Jul 2023
    Posts
    23

    Default Re: Old Maps Vs Google Earth

    Many thanks I hadn't realised that you could turn off both Aspect Ratio and Smart Transform. I, for some reason unknown, assumed that it was one or the other. Interesting to see that the 18nth century very attractive map uses a different scale for its horizontal and vertical distances!Click image for larger version. 

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  6. #6
    Join Date
    Feb 2007
    Location
    UK
    Posts
    21,238

    Default Re: Old Maps Vs Google Earth

    for most of us [I will acknowledge not all] the world is not flat it is round

    therefore no flat map representation is 100% accurate

    the old map uses a different scale for horizontal and vertical distances relative to what?

    old maps are often representational - they are not necessarily based on actual surveys of the land, except very locally

    large scale surveying was underway from the 1700's, so it depends what the map is and who made it [and for what]
    -------------------------------
    Nothing lasts forever...

  7. #7
    Join Date
    Aug 2000
    Location
    Placitas, New Mexico, USA
    Posts
    41,458

    Default Re: Old Maps Vs Google Earth

    The map may have been hand drawn vs based on surveys.

    Smart Transform has never been a popular feature and it is so hidden that most are not aware that it is there.
    Gary W. Priester
    Mr. Moderator Emeritus Dude
    , Sir

    gwpriester.com | eyetricks-3d-stereograms.com | eyeTricks on Facebook






  8. #8
    Join Date
    Jul 2023
    Posts
    23

    Default Re: Old Maps Vs Google Earth

    Mea Culpa!
    Sorry to have troubled you all but I did learn a new technique.
    The old map is in fact quite accurate. The clipped Google Earth map was not flat but inclined. Thus distorting the perspective.
    Sorry

 

 

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