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Posted by napoleone1981 on February 10, 2006, 6:06 am
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Hi,
I'd like to know if exist some GIS or some procedure that, given a
latitude and longitude point, is able to retriev and tell me if the
point is on the sea, lake or is on the land...
It's good enough also if this procedure is able only on a little piece
of the world.
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Posted by willem van deursen on February 10, 2006, 12:24 pm
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Hello,
Any GIS will do this. Just find the right datasets. Google for world data
shapefile. I answered almost the same question a few weeks ago, but then related
to Denmark. I copied and pasted the answer, as it should also be an answer to
this question.
(Copy of the earlier answer)
....
almost any GIS can do this for you, but if you want to build it yourself, one of
the approaches could be:
1. Find and download a shapefile for Denmark. Shapefiles are the de facto
standard for storing vector information in the GIS world. I googled for "Denmark
Shapefile" and this is one of the sites I found:
http://www.vdstech.com/map_data.htm
(Make sure that you get a shapefile with lat/lon projection, I didn't check the
data on this site)
2. Find a convertor to go from shapefile to text. Again: google!
Shp2txt on http://www.obviously.com/gis/shp2text/ seems to do what is needed,
but I didn't check
3. Find the algorithm for pointinpolygon (Google:
http://astronomy.swin.edu.au/~pbourke/geometry/insidepoly/), implement this and
ready to go!
....
But, as I said before, if you don't want to program it yourself, any GIS will do
this for you.
Regards
Willem van Deursen
napoleone1981@gmail.com wrote:
> Hi,
> I'd like to know if exist some GIS or some procedure that, given a
> latitude and longitude point, is able to retriev and tell me if the
> point is on the sea, lake or is on the land...
> It's good enough also if this procedure is able only on a little piece
> of the world.
>
--
Willem van Deursen, The Netherlands
wvandeursen_nospam@nospam_carthago.nl
replace _nospam@nospam_ for @ to get a valid email address
www.carthago.nl
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Posted by N@poleone on February 13, 2006, 8:59 am
Please log in for more thread options Thanks for the response, almost complete... Maybe I don't explain
myself very well..
I need a GIS (probably ArcView or ArcGis) that is able to receive a
"message" from another application (that i'm developing in java) with a
lat, long point and response if it is on the water or not...
Bye
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Posted by PJ Halls on February 13, 2006, 10:12 am
Please log in for more thread options N@poleone wrote:
> Thanks for the response, almost complete... Maybe I don't explain
> myself very well..
> I need a GIS (probably ArcView or ArcGis) that is able to receive a
> "message" from another application (that i'm developing in java) with a
> lat, long point and response if it is on the water or not...
> Bye
>
I presume from your comment that you already have the ESRI products?
Then, the API interface to ArcGIS is likely what you seek.
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