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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>This is likely based on the Astro Position at <STRONG><EM><FONT size=3>Extremo Nordeste da Base de Leste 1904.</FONT></EM></STRONG></FONT></DIV>
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<FONT face=Tahoma size=2><B>From:</B> proj-bounces@lists.maptools.org on behalf of Kassiane Mentz<BR><B>Sent:</B> Thu 25-Nov-10 07:25<BR><B>To:</B> proj@lists.maptools.org<BR><B>Subject:</B> [Proj] Unknown Datum<BR></FONT><BR></DIV>
<DIV>Hello,<BR><BR>We are in a city in southern Brazil (Porto Alegre - Rio Grande do Sul), and have a lot of maps that have a<BR>unknown local Datum.<BR>We are using an application that uses Mapserver webmapping but is having trouble with our maps becouse<BR>they were using an unknown datum, even our forecast and our ellipsoid are known. <BR>Trying to makem with the mapserver automatically convert our maps to WGS84, which is what most<BR>approached our features, we decided to insert a new proj4 Datum.<BR>In file PJ_Datums.c we inserted a new reference vector in pj_datums [] for our datum, passing the parameters<BR>conversion. Also insert an entry in the archive world for our specific case. <BR>Compiled the library with our modifications and uses MapServer to perform a test. Using the command Shp2img, we realized that this stopped working, which indicates that something happened in Proj4.<BR>We would like to know if there really is a way to include a unknown Datum to the proj4 perform the conversion.<BR><BR>The following parameters used:<BR><BR>Projection: Transverse Mercator<BR><BR>Ellipsoid: International 1909 (Hayford)<BR><BR>X Translation (m) -105.3687744788<BR><BR>Y Translation (m) 128.2533004372<BR><BR>Z Translation (m) 5.9501954062<BR><BR>X Rotation (seconds) 0.2526444267<BR><BR>Y Rotation (seconds) -4.9126506172<BR><BR>Z Rotation (seconds) -2.1177220547<BR><BR>Scaling factor 0.99998717166457<BR><BR>False East X 5,000,000 m<BR><BR>False North Y 200,000 m<BR><BR>PS.: We emphasize that we are just programmers, and we are working with cartographers, who does not dominate the program.<BR><BR><BR clear=all><BR>-- <BR><FONT style="COLOR: rgb(102,0,204)" size=4><SPAN style="FONT-FAMILY: trebuchet ms,sans-serif">Thanks;</SPAN></FONT>
<DIV style="COLOR: rgb(102,0,204); FONT-FAMILY: trebuchet ms,sans-serif"><FONT size=4><BR></FONT></DIV>
<DIV style="COLOR: rgb(102,0,204); FONT-FAMILY: trebuchet ms,sans-serif"><FONT size=4>Kassiane<BR></FONT></DIV>
<DIV><FONT style="COLOR: rgb(102,0,204)" size=4><SPAN style="FONT-FAMILY: trebuchet ms,sans-serif">Microsoft Office Specialist</SPAN></FONT><BR></DIV><BR></DIV></BODY></HTML>