I do this by faking a WMS-service, with the pixel size of the scan as
map boundaries, and using an arbitrary EPSG. It's primitive, but it
works and I use it a lot, especially for large serieses of scans.
See:
http://mapserver.sara.nl/atlas/georef.html
Left the unreferenced scan, right the referenced maps, both zoomable
independently. With a little elementary math, you can even align both
maps (the sync buttons). You can even use it in QGIS or any other
WMS-enabled program, e.g. to set reference points for warping or
designing vector art work. Comments appreciated.
Jan
(file: utils.inc)
<?php
function getSizeRaster($data) {
//Compute size of raster file $data in array $arr
return ($ar);
}
function createMapFromData($title,$epsg,$parms,$data)
$oMap = ms_newMapObj("");
$oMap->setProjection("init=epsg:$epsg");
$oMap->setMetaData("wms_title",$title);
$oMap->setMetaData("wms_srs","epsg:$epsg");
$oMap->setMetadata("wms_contactperson","Jan Hartmann");
$oMap->setMetadata("wms_contactorganization","University of
Amsterdam");
$oMap->setMetadata("wms_contactelectronicmailaddress","j.l.h.hartm...@uva.nl");
$oMap->setMetadata("wms_enable_request","*");
$pwd = "http://mapserver.sara.nl/"; . $_SERVER["SERVER_NAME"];
$pwd = $pwd . $_SERVER["PHP_SELF"];
if ($parms) $pwd = $pwd . "?$parms";
$oMap->setMetadata("wms_onlineresource",$pwd);
$l = ms_newLayerObj($oMap);
$l->set("name",$title);
$l->setProjection("init=epsg:$epsg");
$l->setMetadata("wms_title",$title);
$l->setMetadata("wms_srs","epsg:$epsg");
$l->set("status",MS_DEFAULT);
$l->set("type",MS_LAYER_RASTER);
$l->set("data",$data);
$ar = getSizeRaster($data);
$oMap->setExtent($ar[0],$ar[1],$ar[2],$ar[3]);
$oMap->setMetadata("wms_extent","$ar[0] $ar[1] $ar[2] $ar[3]");
$l->setMetadata("wms_extent","$ar[0] $ar[1] $ar[2] $ar[3]");
$oMap->setSize(600,600 * (($ar[3]-$ar[1]) / ($ar[2] - $ar[0])));
return($oMap);
}
function dispatchMap($oMap) {
$request = ms_newowsrequestobj();
$request->loadparams();
ms_ioinstallstdouttobuffer();
$oMap->owsdispatch($request);
$contenttype = ms_iostripstdoutbuffercontenttype();
if ($contenttype == "text/xml") {
header("Content-type: application/xml");
$buffer = ms_iogetstdoutbufferstring();
echo $buffer;
} else {
header("Content-type:$contenttype");
ms_iogetStdoutBufferBytes();
}
ms_ioresethandlers();
}
?>
The simplest WMS-service would be a PHP-script like
<?php
require("utils.inc");
$fn = <path to scan-file>;
$oMap = createMapFromData("WMS_title",28992,"",$fn);
dispatchMap($oMap);
?>
The WMS-service would just be:
mywms.php
When you have a series of numbered scans in subdirectories, you could do:
<?php
require("utils.inc");
$base = <base directory of scans>;
$subdir = $_REQUEST["subdir"];
$nr = $_REQUEST["nr"];
$path = "$base/$subdir/scan_$nr.tif";
$oMap = createMapFromData("scan",28992,"subdir=$subdir&nr=$nr",$path);
dispatchMap($oMap);
?>
And accessl each scan as a WMS service like:
mywms.php?subdir=<subdir>&nr=<nr>
On 02/14/2013 05:03 PM, Weisbender, Eric wrote:
I would like to use MapServer as just an unreferenced image viewer for
jpgs so I can zoom in and out on the image. Everything I read says
that images have to be georeferenced. Any idea or even examples would
be greatly appreciated.
Thanks,
Eric Weisbender
_______________________________________________
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users
