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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Something else to consider if your map uses multiple (or
switches between) “projections”.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My C# map application uses both equirectangular and orthographic
projections. Therefore, I do the following before the lines of code that
Sandeep presented:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:green'>// create a
Mapserver pointObj for the point being converted<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:#2B91AF'>pointObj</span>
pObj = <span style='color:blue'>new</span> <span style='color:#2B91AF'>pointObj</span>(location.LongitudeDeg,
location.LatitudeDeg, 0, 0);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:green'>// create 2
projection objects - a From projection object (a latlong projection) and a To
projection object (the current projection) <o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:#2B91AF'>projectionObj</span>
projectionFrom = <span style='color:blue'>new</span> <span style='color:#2B91AF'>projectionObj</span>(<span
style='color:#A31515'>"+proj=latlong +ellps=WGS84 +datum=WGS84 +over"</span>);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:#2B91AF'>projectionObj</span>
projectionTo = <span style='color:blue'>new</span> <span style='color:#2B91AF'>projectionObj</span>(m_baseMap.getProjection());<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:green'>// perform the
projection of the point from the current projection to a latlong projection;
the point's x (lon) and y (lat) are updated in place<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>bool</span>
bSuccess = (((<span style='color:blue'>int</span>)<span style='color:#2B91AF'>MS_RETURN_VALUE</span>.MS_SUCCESS)
== pObj.project(projectionFrom, projectionTo));<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:blue'>if</span>
(bSuccess)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> // Sandeep’s code here <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span style='color:green'>// cleanup
temporary objects<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> pObj.Dispose();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> projectionFrom.Dispose();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> projectionTo.Dispose();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>Brian<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mapserver-users-bounces@lists.osgeo.org
[mailto:mapserver-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Sucharita
Samuel<br>
<b>Sent:</b> Wednesday, May 07, 2008 7:42 AM<br>
<b>To:</b> Sandeep Kumar Jakkaraju<br>
<b>Cc:</b> mapserver-users<br>
<b>Subject:</b> Re: [mapserver-users] Coverting lat/long to pixel<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'> Thanks a lot Sandeep. I
think the code works.<br>
<br>
Regards,<br>
Sucharita<o:p></o:p></p>
<div>
<p class=MsoNormal>On Wed, May 7, 2008 at 3:40 PM, Sandeep Kumar Jakkaraju <<a
href="mailto:sandeepkumar.jakkaraju@gmail.com">sandeepkumar.jakkaraju@gmail.com</a>>
wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Hi Sucharita <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>these are example values........<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> private double minlat=28.6023 ;<br>
private double minlon=77.2018 ; <br>
private double maxlat=28.6382 ;<br>
private double maxlon=77.2493 ; <br>
<br>
private int screenwidth=2156;<br>
private int screenheight=1674;<br>
private Point p;<br>
<br>
<br>
public Point convertLatLonToPixel(double lat,double lon)<br>
{<br>
double cellsizex =
(maxlon-minlon)/screenwidth;<br>
double cellsizey =
(maxlat-minlat)/screenheight;<br>
<br>
int ix = (int) ((lon-minlon)/cellsizex);<br>
int iy1 = (int)
((maxlat-lat)/cellsizex);<br>
int iy2 = (int)
((maxlat-lat)/cellsizey);<br>
int iy = (int) (iy1+iy2)/2;<br>
<br>
p = new Point(ix,iy);<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>return p;<br>
}<o:p></o:p></p>
</div>
<div>
<div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><br>
<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span class=gmailquote>On 5/7/08, <b>Sucharita Samuel</b>
<<a href="mailto:iworktech.sucharita@gmail.com" target="_blank">iworktech.sucharita@gmail.com</a>>
wrote:</span> <o:p></o:p></p>
<p class=MsoNormal> Hi Sandeep,<br>
A code fragment will be really helpful.<br>
<br>
Thanks,<br>
Sucharita <o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br>
<o:p></o:p></p>
<div>
<p class=MsoNormal>On Wed, May 7, 2008 at 3:20 PM, Sandeep Kumar Jakkaraju <<a
href="mailto:sandeepkumar.jakkaraju@gmail.com" target="_blank">sandeepkumar.jakkaraju@gmail.com</a>>
wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>This can be done using simple interpolation also
....................................<br>
<br>
<o:p></o:p></p>
</div>
<div>
<div>
<div>
<p class=MsoNormal><span class=gmailquote>On 5/7/08, <b>Sucharita Samuel</b>
<<a href="mailto:iworktech.sucharita@gmail.com" target="_blank">iworktech.sucharita@gmail.com</a>>
wrote:</span> <o:p></o:p></p>
</div>
</div>
<blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;
margin-left:4.8pt;margin-right:0in'>
<div>
<div>
<p class=MsoNormal>Hi friends,<br>
Can somebody please help me with a code to convert the latitude and longitude
of a point to pixel co-ordinates? I am using <a href="http://asp.net/"
target="_blank">ASP.NET</a>. I have heard that GDAL has a method for this
conversion. MS4W comes with GDAL as its tools, but I don't know how to
implement it in C#.NET.<br>
<br>
<br>
Thanks in advance,<br>
<br>
Regards,<br>
Sucharita<br>
<br>
<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>
mapserver-users mailing list<br>
<a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<a href="http://lists.osgeo.org/mailman/listinfo/mapserver-users"
target="_blank">http://lists.osgeo.org/mailman/listinfo/mapserver-users</a><o:p></o:p></p>
</blockquote>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br clear=all>
<br>
-- <br>
Thanks<br>
Regards<br>
<span style='color:#888888'><br>
Sandeep Kumar Jakkaraju </span><br>
_______________________________________________<br>
mapserver-users mailing list<br>
<a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<a href="http://lists.osgeo.org/mailman/listinfo/mapserver-users"
target="_blank">http://lists.osgeo.org/mailman/listinfo/mapserver-users</a><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</div>
<p class=MsoNormal><br>
<br clear=all>
<br>
-- <br>
Thanks<br>
Regards<br>
<br>
Sandeep Kumar Jakkaraju <o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
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