<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV>Hmm, sorry to show up again here.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I am not too sure how to handle the following request(s) (by the same user):</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>1) the first map in the browser shows up in the original projection, i.e. geographic</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>2) now the user changes to say Mollweide, and request a redraw of the map</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>3) the reprojection is being done in the background via the two lines mentioned below,</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN> the map displayed in the browser now in global view and Mollweide projection</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>4) the user now makes a second request - either adding a layer or by zooming in</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>So, now the incoming extent coordinates (imgext) are like this:</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>-18040095.70 -9020047.85 18040095.70 9020047.85</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>instead of </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>-180 -90 180 90</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I have now the possibility to </DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>- calculate the values (in meter) back into DD</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>- do the zoom in</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>- and project the map again into Mollweide</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I probably would use something like this</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$mollweide=ms_newprojectionObj("proj=moll,lon_0=0,x_0=0,y_0=0" );</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$newproj = ms_newprojectionObj("proj=longlat,ellps=WGS84,datum=WGS84,no_defs" );</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$oRect= ms_newRectObj();</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$oRect->setextent(-18040095.70, -9020047.85, 18040095.70, 9020047.85);</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$oRect->project($mollweide,$newproj);</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$map->setextent( $oRect->minx, $oRect->miny, $oRect->maxx, $oRect->maxy );</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>and then reproject it again into Mollweide?</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Seems rather "cumbersome"....</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Stefan</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV>Jacob, Nicol,</DIV><DIV><BR class="khtml-block-placeholder"></DIV>Ahhhh.... bit irritating these different coding possibilities...<DIV><BR class="khtml-block-placeholder"></DIV><DIV>Ok, I met the original definition to all layers AND the map file:</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>PROJECTION</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>'init=epsg:4326'</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>END</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>and when using </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$newproj="proj=robin,lon_0=0,x_0=0,y_0=0"; // projection string of your new projection</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>$map->setProjection($newproj,MS_TRUE);</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>it indeed works!</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Great, thanks a lot guys for that help!!!</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Best regards,</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Stef</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR><DIV><DIV>On Aug 24, 2006, at 10:05 AM, Delfos, Jacob wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2">Hi Stefan,</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2">Yes, you do have to specify which projection each layer is in, otherwise when they are reprojected you will run into trouble (if it doesn't know where to reproject FROM, it won't be able to do i). It's not too hard, though. </FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN><FONT face="Arial" color="#0000ff" size="2"></FONT> </DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2">You should not have to recalculate the extent; it should be automatic. Definitely don't try to change the numbers (coordinates) without changing the projection (that would be bad).</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2">Try this:</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006">$newproj="proj=robin,lon_0=0,x_0=0,y_0=0"; // projection string of your new projection</SPAN></DIV> <DIV dir="ltr" align="left"> <DIV>$map-><SPAN class="357264007-24082006">setProjection($newproj,MS_TRUE);</SPAN></DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"></FONT> </DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"><SPAN class="357264007-24082006">I think that ought to be all. The MS_TRUE makes it pick the best fit to the current extent in the new projection. Make sure your projection string is valid.</SPAN></FONT></DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"><SPAN class="357264007-24082006"></SPAN></FONT> </DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"><SPAN class="357264007-24082006">regards,</SPAN></FONT></DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"><SPAN class="357264007-24082006"></SPAN></FONT> </DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"><SPAN class="357264007-24082006">Jacob</SPAN></FONT></DIV> <DIV><FONT face="Arial" color="#0000ff" size="2"><SPAN class="357264007-24082006"></SPAN></FONT> </DIV></DIV> <DIV dir="ltr" align="left"><SPAN class="357264007-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV><BR> <BLOCKQUOTE dir="ltr" style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"> <DIV class="OutlookMessageHeader" lang="en-us" dir="ltr" align="left"> <HR tabindex="-1"> <FONT face="Tahoma" size="2"><B>From:</B> UMN MapServer Users List [<A href="mailto:MAPSERVER-USERS@LISTS.UMN.EDU">mailto:MAPSERVER-USERS@LISTS.UMN.EDU</A>] <B>On Behalf Of </B>Stefan Schwarzer<BR><B>Sent:</B> 24 August 2006 15:35<BR><B>To:</B> <A href="mailto:MAPSERVER-USERS@LISTS.UMN.EDU">MAPSERVER-USERS@LISTS.UMN.EDU</A><BR><B>Subject:</B> Re: [UMN_MAPSERVER-USERS] Mapscript Re-Projection on-the-fly<BR></FONT><BR></DIV> <DIV></DIV>Jacob & Nicol, <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>thanks for your feedback.</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>But I am still struggling. Just to clarify: I wonna reproject not individual layers, but my whole map.</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>Jacob, does "<SPAN class="010195305-24082006"><FONT class="Apple-style-span" face="Arial" color="#0000ff" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 10px">For this, it is required that your layer has a projection object with the native projection of that layer.</SPAN></FONT>" that mean that for each single layer I have to specify the original projection? (Geographic in my case)</SPAN></DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>As Nicol stated I need to "recalculate" the extent, at least when using different units (going from DD to Meters). </DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>But then, I found that piece of code (slightly changed):</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$newproj=ms_newprojectionObj("proj=robin,lon_0=0,x_0=0,y_0=0");</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$latlon=ms_newprojectionObj("proj=longlat,ellps=WGS84,datum=WGS84,no_defs");</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$oldext=ms_newRectObj();</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$oldext->setextent(-180,-90,180,90); //this is the extent of my map in geographic</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$oldext->project($latlon,$newproj); //reproject to Robinson</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$map->setextent($oldext->minx,$oldext->miny,$oldext->maxx,$oldext->maxy); //set the new map extent</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>And another one going like this:</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$projInObj = ms_newProjectionObj( "+proj=tmerc ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+lat_0=49 ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+lon_0=-2 ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+k=0.999601 ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+x_0=400000 ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+y_0=-100000 ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+ellps=airy ".</DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> "+towgs84=375,-111,431,0,0,0,0");</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>with this info in the mapscript documentation...</DIV> <DIV style="MARGIN: 0px; BACKGROUND-COLOR: rgb(229,229,229)"><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">int setProjection(string proj_params, boolean bSetUnitsAndExtents)</SPAN></FONT></DIV> <DIV style="MARGIN: 0px; BACKGROUND-COLOR: rgb(229,229,229)"><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">Set map projection and coordinate system.</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">Parameters are given as</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT></DIV> <DIV style="MARGIN: 0px; BACKGROUND-COLOR: rgb(229,229,229)"><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">a single string of comma-delimited PROJ.4 parameters.</SPAN></FONT></DIV> <DIV style="MARGIN: 0px; BACKGROUND-COLOR: rgb(229,229,229)"><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">The argument : bSetUnitsAndExtents is used to automatically update</SPAN></FONT></DIV> <DIV style="MARGIN: 0px; BACKGROUND-COLOR: rgb(229,229,229)"><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">the map units and extents based on the new projection. Possible</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT></DIV> <DIV style="MARGIN: 0px; BACKGROUND-COLOR: rgb(229,229,229)"><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px"> </SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="FONT-SIZE: 9px">values are MS_TRUE and MS_FALSE. By defualt it is set at MS_FALSE</SPAN></FONT></DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>So, what should I use? And where is coming the <SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"> </SPAN></DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$map -> setProjection</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>into play?</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>Thanks for any clarification.</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>Stefan</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><BR> <DIV> <DIV>On Aug 24, 2006, at 7:59 AM, Delfos, Jacob wrote:</DIV><BR class="Apple-interchange-newline"> <BLOCKQUOTE type="cite"> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2">Stefan,</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2">Your question is not entirely clear. You can not re-project an individual layer on-the-fly, because php_mapscript does not re-write the dataset (hence its projection will always be the same); you CAN however change the projection of the map (using setProjection, as you did), which means all layers in the map get re-projected (the dataset remains unchanged, though). For this, it is required that your layer has a projection object with the native projection of that layer. This will cause the layer to be reprojected along with the map. Is this what you are trying to do? </FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2">You *may* have to save your mapfile, or your session, in order for it to take effect, depending on your setup.</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2">regards,</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2">Jacob</FONT></SPAN></DIV> <DIV dir="ltr" align="left"><SPAN class="010195305-24082006"><FONT face="Arial" color="#0000ff" size="2"></FONT></SPAN> </DIV><BR> <BLOCKQUOTE dir="ltr" style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"> <DIV class="OutlookMessageHeader" lang="en-us" dir="ltr" align="left"> <HR tabindex="-1"> <FONT face="Tahoma" size="2"><B>From:</B> UMN MapServer Users List [<A href="mailto:MAPSERVER-USERS@LISTS.UMN.EDU">mailto:MAPSERVER-USERS@LISTS.UMN.EDU</A>] <B>On Behalf Of </B>Stefan Schwarzer<BR><B>Sent:</B> 24 August 2006 13:45<BR><B>To:</B> <A href="mailto:MAPSERVER-USERS@LISTS.UMN.EDU">MAPSERVER-USERS@LISTS.UMN.EDU</A><BR><B>Subject:</B> Re: [UMN_MAPSERVER-USERS] Mapscript Re-Projection on-the-fly<BR></FONT><BR></DIV> <DIV></DIV>Hey, <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>I can't imagine that such a question stays unanswered in the mapserver community...</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>I meanwhile added a:</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><SPAN class="Apple-tab-span" style="WHITE-SPACE: pre"></SPAN>$map -> setProjection("init=epsg:26711");</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>to my code, but nothing happens - meaning: no error message but no reprojection either.</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>Can anyone help me out?</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>Thanks in advance.</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV>Stefan</DIV> <DIV><BR class="khtml-block-placeholder"></DIV> <DIV><BR> <DIV> <DIV>On Aug 22, 2006, at 10:47 AM, Stefan Schwarzer wrote:</DIV><BR class="Apple-interchange-newline"> <BLOCKQUOTE type="cite"><FONT class="Apple-style-span" face="Arial">Gush,</FONT> <DIV><FONT class="Apple-style-span" face="Arial"><BR class="khtml-block-placeholder"></FONT></DIV> <DIV><FONT class="Apple-style-span" face="Arial">I couldn't find any precise information about how to re-project layers on-the-fly via PHP Mapscript. Here and there (via MailingList and Google) bits and pieces, but altogether it didn't help me a lot. Though I would have said that this is a basic question. But perhaps too basic, so everbody finds out by himself?</FONT></DIV> <DIV><FONT class="Apple-style-span" face="Arial"><BR class="khtml-block-placeholder"></FONT></DIV> <DIV><FONT class="Apple-style-span" face="Arial">So, can anyone let me know - giving a coding example - how to re-project a mapfile on-the-fly from for example Lat/Long (global view) to Lambert or Robin? </FONT></DIV> <DIV><FONT class="Apple-style-span" face="Arial"><BR class="khtml-block-placeholder"></FONT></DIV> <DIV><FONT class="Apple-style-span" face="Arial">Thanks a lot for your help!</FONT></DIV> <DIV><FONT class="Apple-style-span" face="Arial"><BR class="khtml-block-placeholder"></FONT></DIV> <DIV><BR class="khtml-block-placeholder"></DIV></BLOCKQUOTE></DIV><BR></DIV></BLOCKQUOTE></BLOCKQUOTE></DIV><BR></DIV></BLOCKQUOTE></BLOCKQUOTE></DIV><BR></DIV></BLOCKQUOTE></DIV><BR></BODY></HTML>