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  • Not able to find the right syntax to downloa a hiking map from a webpage



    Hello again Mike,

    The syntax is: https://www.caimontilattari.it/caimap/Zoom level/X tile #/Y tile #.jpg

    Unfortunately, that's where the simplicity ends.  The map is an interactive tiled web map, so it is being created "on the fly" as you zoom and/or pan, in a manner similar to how Global Mapper's "Map Catalog" function works.  Each time you zoom/pan the website creates URL's for only the tiles necessary to complete that view (with some caching).  When you zoom and still get that nice crisp clear unpixelated image, it isn't "magnifying" as you might imagine, it's creating a new image from a different higher resolution tile set.  (Notice it takes a small time to display each time.)  

    The syntax is the same as the "slippy tile" format that the background map (and Google Earth, OSM, etc.) tiles use.  It is "...caimap/" is followed by a zoom level, which then determines an X and Y tile number for the tile by use of a formula.  I put the formulas below if you want to try it.  So, for example you would use "...caimap/Z15/17687/12317.jpg" for the upper leftmost tile at zoom level 15.

    The problem is the number of tiles you need for the whole map at the resolution I think you're expecting.  This map has a max zoom of 16, but only tiles above zoom 14 will likely be suitable.  Here is the X/Y tile # range and number of tiles in the map for Zoom levels 13-15:

    Zoom 13   (4421-4430), (3079-3083), 36 tiles
    Zoom 14   (8843-8861), 6158-6167), 162 tiles
    Zoom 15   (17687-17723), (12317-12337), 720 tiles

    The 36 Zoom level 13 tiles will create a map image 2304 x 1024 pixels, but it won't be crisp upon zooming anymore (like the web map), it will rapidly pixelate.  I attached a tile of each zoom level, so you can look for yourself at the resolution.  To me, level 13 is worthless, and even level 14 looked fuzzy at it's native size.  Level 15 looks really good, but as you can see, that introduces the next problem - how to mosaic 720 un-georeferenced images.  Even 36 is a formidable task.  (Irfanview might do it.)  But alas, at Zoom 13 resolution is out the window.

    So, the short of it all is that it can be done (and georeferenced too), but it's likely not worth the trouble for your needs.  If you had some small area(s) of the map you really wanted, you can use the formulas and extract an area of Z15 tiles; but it took 72 tiles just to make an area about 3.5 miles per side at Zoom 15.

    "You can't always get what you want"

    If you want to proceed in some way or have other questions, let me know.

    Best regards,

    Mark

    Formulas:

    Lat/Long (decimal degrees) to X/Y tile #'s

    n = 2 ^ zoom
    xtile = n * ((lon_deg + 180) / 360)
    ytile = n * (1 - (log(tan(lat_rad) + sec(lat_rad)) / π)) / 2

    X/Y tile #'s to Lat/long

    n = 2 ^ zoom
    lon_deg = xtile / n * 360.0 - 180.0
    lat_rad = arctan(sinh(π * (1 - 2 * ytile / n)))
    lat_deg = lat_rad * 180.0 / π
    (To automate these, you can find Python [and other] code here: https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Python)



          
    Mykle
  • how to export TIN in globalmapper from lidar data or DEM

    You can save into different formats which is available in the list. but cannot save like *.TIN like in arcgis. because there will be difference in algorithm used for creating TIN in GM and Arcgis for triangulation.
    SilviaTG25
  • Select by location within a distance

    You can do like this:
    Give an attribute to PORTALS:


    Than Copy Attributes between Portals and Cans in a max dist of 100m:




    SilviaTG25
  • gathering Data from created line features

    Does looking at it in 3D help? Perhaps with vertical exaggeration, if it's quite subtle? Otherwise, if something you're doing often, it seems like something you could probably write a script for, which could spit out data for all the lines.
    curves
  • Global Mapper v15 64bit Installation File

    If you have a valid licence file I can help. Please send me a personal message.
    jcsaquet
  • scripting

    Hello Alberto,

    Thanks for letting us know that the link was broken. It has been fixed, so you should be able to download the data now.

    Cheers,
    Bob
    alberto_fr
  • A tough map

    PS. My compliments! You've done a pretty darn good job!!!
    Mykle
  • Buffer Tool - Create Line features instead of Area features

    Hello,

    I have added feature request 26599 requesting the ability to create buffers as line features to our task list. We will post a message to this thread when the status changes.

    Cheers,
    Bob
    DerrickWyianni
  • How to create Cross Sections (3D-lines) with lidar data?

    Hi, I can't figure out how I get Cross Sections (3D-lines) out ouf a point cloud.
    I can use the path-profile tool and can export the points of one profile, but I don't get a 3D-line.

    Is there an other tool or function that I don't see?

    Any ideas?

    (I would not like to transform the pointcloud to an elevation model first)

    Thank you.

    Rainer
    DerrickW
  • Buffer Tool - Create Line features instead of Area features

    Hello,

    I have added feature request 26599 requesting the ability to create buffers as line features to our task list. We will post a message to this thread when the status changes.

    Cheers,
    Bob
    DerrickWyianni