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  1. #1
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    Default Georeferencing a cave map

    Well, I want to georeference a new cave survey on earth, I got the gps position of the entrance of the cave, but since it has no other exit I don't have enough point to calibrate the map, a friend that is a boater gave me a link to a little calculator that I can have the GPS position entering distance and heading, but like that I need to do it point by point.

    is there any of the survey software that allow to enter the coordinates and will calculate the coordinates of the rest of the cave?

    we are doing it in compass but I haven't seen this feature, I find it something very simple to implement in a soft and extremely useful, but I haven't seen that yet.

    well, I want this to check if the cave is going in the direction of other sinkholes in the area between other few stuff

    tanks in advance

    Cristian Pittaro
    www.neptunoworld.com
    and don't forget to check out my MiniSpools
    http://www.dr-ss.com Dominican Republic Speleological Society
    http://la-hispaniola.com Free maps for Dominican Republic and Haiti for Garmin GPS's

  2. #2

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    I have done this for several caves. It can be done, but I feel like I would have to write a book in order to explain how to do it on this forum. If I can find the time, I will try and post a set of instructions, but they will rely on being very good with Google Earth as well as Photoshop.


  3. #3

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    Here is an example:
    Attached Thumbnails Attached Thumbnails Click image for larger version

Name:	OverlayExample.jpg
Views:	175
Size:	95.0 KB
ID:	1291  


  4. #4
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    Default

    looks really good, it has to be photoshop? or can be corel al well?

    Cristian Pittaro
    www.neptunoworld.com
    and don't forget to check out my MiniSpools
    http://www.dr-ss.com Dominican Republic Speleological Society
    http://la-hispaniola.com Free maps for Dominican Republic and Haiti for Garmin GPS's

  5. #5

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    I guess you could use any photo editing program to prep the map, as long as it supports PNG files and transparent layers.


  6. #6
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    New Jersey. Dreaming of Q. Roo.
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    Default

    Maybe I am misinterpreting what you want to do, but if you have a GPS fix and the data in compass you can export the plot to a KML file. Then import it into Google Earth. You can then use Google Earth's pointer or pins to determine the approximate Lat/Lon. Additionally, I believe the recent version of Compass with give you the Lat/Lon of a station if you put in the fixed point. You do not need any drawing programs for the basic mapping. If you want to pretty it up, well that is another story.

    If you need more info on how to do this, let me know.

    Hans


  7. #7
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    Default

    yes I found that function but looks like the map that comes out is off the coordinates for some reason and my google earth is not working anymore... I updated it and my computer does not support the last versions for some reason

    Cristian Pittaro
    www.neptunoworld.com
    and don't forget to check out my MiniSpools
    http://www.dr-ss.com Dominican Republic Speleological Society
    http://la-hispaniola.com Free maps for Dominican Republic and Haiti for Garmin GPS's

  8. #8

    Default

    Quote Originally Posted by Luxrok View Post
    Maybe I am misinterpreting what you want to do, but if you have a GPS fix and the data in compass you can export the plot to a KML file. Then import it into Google Earth. You can then use Google Earth's pointer or pins to determine the approximate Lat/Lon. Additionally, I believe the recent version of Compass with give you the Lat/Lon of a station if you put in the fixed point. You do not need any drawing programs for the basic mapping. If you want to pretty it up, well that is another story.

    If you need more info on how to do this, let me know.

    Hans
    Well that just goes to show you that I don't keep up with the software updates enough! That makes it a lot easier to do if you just want the plot. You can get a lot more detail in the maps if you do it manually though. If no one cares about how to do it manually, I guess I don't need to write my book of instructions now!


  9. #9
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    Default

    Quote Originally Posted by Neptuno View Post
    yes I found that function but looks like the map that comes out is off the coordinates for some reason and my google earth is not working anymore... I updated it and my computer does not support the last versions for some reason
    A mistake that I made when I first started with this is choosing the incorrect datum when I exported my data from Compass into the KML file. From Google's help file, "Google Earth uses Simple Cylindrical projection with a WGS84 datum for its imagery base". Therefore on the export page make sure to select WGS84 from the Datum drop down.

    For more information you can check out: http://earth.google.com/userguide/v4/ug_importdata.html.

    I am sorry to hear Google Earth has quit on you. What operating system are you using? Are you getting an error?

    Hans


  10. #10
    Member
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    Default

    I did use wgs84, another problem that I have is that I am not able to convert the kml to other formats, maybe some kind of error in the export, I guess the only way to fix it would be opening it in google and save it again.

    so, you are exporting it and it is in the exact place it should be????

    Cristian Pittaro
    www.neptunoworld.com
    and don't forget to check out my MiniSpools
    http://www.dr-ss.com Dominican Republic Speleological Society
    http://la-hispaniola.com Free maps for Dominican Republic and Haiti for Garmin GPS's


 

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