[Geowanking] Converting Lat Long to X Y

[Pall Thayer]

Oh, ps... forgot to mention that the code is GPL'ed (as is noted in  
the complete version at the included link) so please follow GPL  
procedures if you use any of it. Well... not "please" just do, it's  
the law.

best r.
Pall

On 31.1.2008, at 22:01, Pall Thayer wrote:

> Hi Paul,
> Below is a class I wrote for a Java applet a few years ago to  
> convert lat/lon to x/y coordinates for a map of Iceland. It works  
> from a user defined center point so it should be pretty easy to  
> manipulate for use with other areas. Also, if you want to see the  
> class in the full context of it's original use you can download the  
> whole package at http://pallit.lhi.is/insideout/TCMIIaO.tar.gz  
> Parts of it are pretty nasty looking hacks but it works very well.
>
> best r.
> Pall Thayer
>
> class parseMe extends ismap {
> 	/* Aside from the URL and background images, the offslat, offslon,  
> kmbtlat and kmbtlon variables
> 	should be the only things you have to change to make
> 	the map visualize data from a different area than Iceland.
> 	offslat and offslon should represent the center of the
> 	area you wish to show.*/
> 	
> 	//offslat and offslon are the center coords for the map
> 	double offslat = 65.15;
> 	double offslon = 18.8533;
> 	
> 	/*kmbt = Kilometres between These should be
> 	manipulated to give a flattened representation of
> 	GPS data*/
> 	double kmbtlat = 80;
> 	double kmbtlon = 40;
> 	drawMe myDraw;
>
> 	public void init() {
> 		setBackground(Color.white);
> 		myDraw = new drawMe();
> 	   add(myDraw);
> 	   myDraw.init();
> 	
> 	}
> 	
> 	public void translator(String myCol, String myLat, String myLon) {
> 	/*This is where we take the GPS coords and convert them into plots.
> 	Lots of mysterious hacking going on here. Just play around with the
> 	numbers until it looks right.*/
> 		try{
> 			//using Float.valueOf for MSJVM compatibility
> 			float myLat2 = (Float.valueOf(myLat)).floatValue();
> 			float myLon2 = (Float.valueOf(myLon)).floatValue();
> 			myLat2 = ((float)offslat-myLat2);
> 	  	 	myLon2 = ((float)offslon-myLon2);
> 	  	 	//System.out.println("***"+myLat2+" "+myLon2);
> 	      myLat2 = (myLat2*(float)kmbtlat)*1;
> 	      myLon2 = (myLon2*(float)kmbtlon)*1;
> 	      float[] coords = {0,0};
> 			coords[0] = myLat2;
> 			coords[1] = myLon2;
> 			//Send the plot data to the myDraw class
> 			myDraw.readCoords(myCol, coords[0], coords[1]);
> 		}catch(Exception e){System.err.println(e);}
> 	
> 	}
> 	
> 	public void stop() {
> 	
> 	}
>
> }
>
>
>
> On 31.1.2008, at 21:34, Paul Harwood wrote:
>
>> Hi,
>>
>> Just a lazy question from a novice geowanker I suppose...but it  
>> might save me an evenings surfing though if you can help.
>>
>> I have googled a bit, with a few solutions... but does anyone have  
>> a perl script (or a site) to hand, to do Lat Long conversions to X  
>> Y? I have UK postcode/outcode/location database that I want to  
>> convert from L Lo to X Y.
>>
>> I have found this link but don't have enough experience to know  
>> whether its accurate enough, or whether the area I am covering  
>> will have any bearing on it.
>>
>> http://dan.pfeiffer.net/maps/convert.htm
>>
>> Many thanks
>>
>> Paul
>>
>>
>>
>>
>>
>> _______________________________________________
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>
>
>
>
> --
> Pall Thayer
> palli at pallit.lhi.is
> http://www.this.is/pallit
>
>
>
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--
Pall Thayer
palli at pallit.lhi.is
http://www.this.is/pallit