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Mapping - Contour tools

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  • 11-06-2015 11:44am
    #1
    [Deleted User]
    Posts: 0 ✭


    Not sure if this is the right board so please move if somewhere else is more appropriate.

    I can't find a way to do this on google earth so would appreciate any advice.

    I would like to produce a map of an area, raising the water level by 1m or so. The purpose is to give an idea of what the local terrain might have been long ago before a river got drained etc...

    The second thing I would like to do is to make a cross section to determine if a point 30km away should be visible from a hill. I know how to do this on paper using ordinance maps but I wonder if its possible online.


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    #2
    RuggieBear
    Registered Users Posts: 17,958 ✭✭✭✭RuggieBear


    not sure if it can be done online but it would be possible using GIS...dtm viewshed or line of sight analysis etc


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    #3
    GetWithIt
    Registered Users Posts: 2,081 ✭✭✭GetWithIt


    Viewshed has plenty of online samples. They do necessitate certain services though. I've seen more recent stuff which utilises GPUs to do the same analysis in real time with your mouse which was pretty impressive when you appreciate how long the same sort of query usually takes.

    https://developers.arcgis.com/javascript/jssamples/gp_viewshed.html
    http://developers.arcgis.com/javascript/samples/gp_viewshed/

    There is a website that allows you increase the sea-levels and observe which areas would be covered. Is that what you're looking for?

    Googling throws up some specialist GIS tools and workflows for animating groundwater levels.


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    #4
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    GetWithIt wrote: »
    Viewshed has plenty of online samples. They do necessitate certain services though. I've seen more recent stuff which utilises GPUs to do the same analysis in real time with your mouse which was pretty impressive when you appreciate how long the same sort of query usually takes.

    https://developers.arcgis.com/javascript/jssamples/gp_viewshed.html
    http://developers.arcgis.com/javascript/samples/gp_viewshed/

    There is a website that allows you increase the sea-levels and observe which areas would be covered. Is that what you're looking for?

    Googling throws up some specialist GIS tools and workflows for animating groundwater levels.

    Thank you! Thats the kind of thing I was looking for and the viewshed sample is already useful, though limited to 5 miles. Im not a programmer but it looks like something the open software community will polish up in the near future.
    Yes, the rising sea level site might be useful and I would appreciate a link. Although I'm looking at an inland situation, with any luck the programme won't differentiate on grounds of distance from the sea.


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