Help needed in Raster/World file
Ed McNierney
ed at TOPOZONE.COM
Wed May 10 09:46:28 EDT 2006
Raffle -
You know how to set the georeference information for your TIF file (by creating the TFW file). But you don't know what numbers to use.
I cannot tell you the geographic parameters of your image - you need to find that out. If you need to integrate it with other data layers, you need to know the extents and resolution of the raster image; if it is not the same projection as your other layers, then you need to know the details of the projection, too. If the raster image is not georeferenced you need to (a) go back to the source of the image and get that information, or (b) locate several known coordinate points on the image and calculate the image parameters (a tedious and not-very-accurate process in most cases).
- Ed
Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA 01863
ed at topozone.com
(978) 251-4242
-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of grabiel
Sent: Wednesday, May 10, 2006 2:44 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] Help needed in Raster/World file
Hi
Ed
You are right. I didnot set any georeference information set or project information in the .tif file. I simply took one image and trying to display it along with other layers. Also i need to integrate the image with other layer. Can you please tell me how to set the georeference/projection information in my .tif file.
Thanks in advance.
Raffle
--- On Tue 05/09, Ed McNierney < ed at TOPOZONE.COM > wrote:
From: Ed McNierney [mailto: ed at TOPOZONE.COM]
To: MAPSERVER-USERS at LISTS.UMN.EDU
Date: Tue, 9 May 2006 08:21:23 -0400
Subject: Re: [UMN_MAPSERVER-USERS] Help needed in Raster/World file
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.2873" name=GENERATOR></HEAD> <BODY> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2>Raffle -</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2>That's an important difference! If you have a TFW file in the first place, gdalinfo will simply return its contents to you. So you're using the contents of your TFW file to decide what information to put in your TFW file....</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2>You seem to have no georeferencing information in that file. What information do you have about the projection and coordinate extents of that input image? Do you need to only display this single layer, or do you need to integrate it with other data layers?</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><FONT face=Arial color=#0000ff size=2> - Ed</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=190061912-09052006><!-- Converted from text/plain format --> <P><FONT size=2>Ed McNierney<BR>President and Chief Mapmaker<BR>TopoZone.com / Maps a la carte, Inc.<BR>73 Princeton Street, Suite 305<BR>North Chelmsford, MA 01863<BR>Phone: +1 (978) 251-4242<BR>Fax: +1 (978) 251-1396<BR>ed at topozone.com</FONT> </P></SPAN></DIV><BR> <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 [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] <B>On Behalf Of </B>raffle peter<BR><B>Sent:</B> Tuesday, May 09, 2006 3:32 AM<BR><B>To:</B> MAPSERVER-USERS at LISTS.UMN.EDU<BR><B>Subject:</B> Re: [UMN_MAPSERVER-USERS] Help needed in Raster/World file<BR></FONT><BR></DIV> <DIV></DIV> <DIV>Hi</DIV> <DIV> Ed</DIV> <DIV> I changed the status from On to Default but still its not working. One thing i want to tell you that if i delete the .tfw file the output of gdalinfo also changed which like this---></DIV> <DIV> </DIV> <DIV> #gdalinfo test.tif ### Without test.tfw file ######</DIV>
<DIV>Driver: Gtiff/GeoTiff</DIV>
<DIV>Size is 1042, 722</DIV>
<DIV>Co-ordinate System is `'</DIV>
<DIV>METADATA</DIV>
<DIV>----------</DIV>
<DIV>----------</DIV>
<DIV>Upper Left (0.0, 0.0)</DIV>
<DIV>Lower left (0.0, 722.0)</DIV>
<DIV>Upper right (1042.0, 0.0)</DIV>
<DIV>center(521.0, 361.0)</DIV>
<DIV> </DIV>
<DIV>Band 1 Block=1024*64 TYPE=BYTE, ColorInterp=RED</DIV> <DIV>..........................................................................=Green</DIV>
<DIV>......................................................................=BLUE</DIV>
<DIV> </DIV>
<DIV>Then what will be my values in my .tfw file? Now if i put the values in my .tfw file then the output of my gdalinfo also changed according to the values that i put there.</DIV> <DIV> </DIV> <DIV>Where is the problem? Whether i need to put Projection statement in my mapfile?</DIV> <DIV>Please help me </DIV> <DIV>Thanks in advance</DIV> <DIV>Raffle<BR><BR><B><I>Ed McNierney <ed at topozone.com></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<META content="MSHTML 6.00.2900.2873" name=GENERATOR>
<DIV dir=ltr align=left><SPAN class=290361611-08052006><FONT face=Arial
color=#0000ff size=2>Raffle -</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=290361611-08052006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=290361611-08052006><FONT face=Arial
color=#0000ff size=2>If you set your LAYER to STATUS ON it won't display - you
need to set it to STATUS DEFAULT.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=290361611-08052006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=290361611-08052006><FONT face=Arial
color=#0000ff size=2> - Ed</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=290361611-08052006><!-- Converted from text/plain format -->
<DIV><FONT size=2>Ed McNierney<BR>President and Chief Mapmaker<BR>TopoZone.com
/ Maps a la carte, Inc.<BR>73 Princeton Street, Suite 305<BR>North Chelmsford,
MA 01863<BR>Phone: +1 (978) 251-4242<BR>Fax: +1 (978)
251-1396<BR>ed at topozone.com</FONT> </DIV></SPAN></DIV><BR>
<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
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU] <B>On Behalf Of </B>raffle
peter<BR><B>Sent:</B> Monday, May 08, 2006 7:12 AM<BR><B>To:</B>
MAPSERVER-USERS at LISTS.UMN.EDU<BR><B>Subject:</B> Re: [UMN_MAPSERVER-USERS]
Help needed in Raster/World file<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>Hi</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT
color=#0000ff> I have given the mapfile below and after
modifying the value as you suggested in</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT
color=#0000ff>your previous, I am not getting the raster image on my final
output.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT
color=#0000ff>Thanks in advance</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT
color=#0000ff>Raffle</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT size=2>
<DIV> </DIV>
<DIV>NAME "Europe"</DIV>
<DIV>SIZE 200 200</DIV>
<DIV>STATUS ON</DIV>
<DIV>SYMBOLSET ....."</DIV>
<DIV>EXTENT 2700051.860 2462746.020 3582564.801 3012459.468</DIV>
<DIV>UNITS METERS</DIV>
<DIV>SHAPEPATH " "</DIV>
<DIV></DIV>
<DIV>WEB</DIV>
<DIV>IMAGEPATH ""</DIV>
<DIV>IMAGEURL ""</DIV>
<DIV>END</DIV>
<DIV>.......</DIV>
<DIV>LAYER</DIV>
<DIV>DATA "/usr/local/apache/htdocs/gmap/htdocs/data/europe.tif"</DIV>
<DIV>NAME "raster_back"</DIV>
<DIV>TYPE RASTER</DIV>
<DIV>STATUS ON </DIV>
<DIV>END</DIV>
<DIV></DIV>
<DIV>END</DIV></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006></SPAN><SPAN
class=049394813-06052006></SPAN><SPAN class=049394813-06052006></SPAN><SPAN
class=049394813-06052006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>Raffle -</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>Zero is a perfectly nice number! There's nothing
wrong with 0.0 in your world file, especially in the second and third
lines. For the vast majority of raster images you will find that the
fourth line is the same as the first line with the sign reversed, and the
second and third lines are 0.0. A world file will often look
like:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>100.0</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>0.0</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>0.0</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>-100.0</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>12345.67</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2>987654.32</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006>
<FONT face=Arial color=#0000ff size=2>- Ed</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=049394813-06052006><!-- Converted from text/plain format -->
<DIV><FONT size=2>Ed McNierney<BR>President and Chief Mapmaker<BR>TopoZone.com
/ Maps a la carte, Inc.<BR>73 Princeton Street, Suite 305<BR>North Chelmsford,
MA 01863<BR>Phone: +1 (978) 251-4242<BR>Fax: +1 (978)
251-1396<BR>ed at topozone.com</FONT> </DIV></SPAN></DIV><BR>
<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
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU] <B>On Behalf Of </B>raffle
peter<BR><B>Sent:</B> Saturday, May 06, 2006 9:07 AM<BR><B>To:</B>
MAPSERVER-USERS at LISTS.UMN.EDU<BR><B>Subject:</B> [UMN_MAPSERVER-USERS] Help
needed in Raster/World file<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV> </DIV>
<DIV> Hi</DIV>
<DIV> I am trying to include a .tif file for raster
background. For that i have to write a .tfw(world file) for the corresponding
.tif file. The information that i need to put in the world file are X, Y Pixel
size, rotational co-efficient and X, Y location of the center of the top left
pixel. I am trying to find these values by using gdalinfo-- but some values
are 0.0</DIV>
<DIV>in their corresponding field.</DIV>
<DIV> Can anyone plz help me, how to get/set these values for the
world file so that i can</DIV>
<DIV>keep my raster data georeferenced with other layers in my mapfile.</DIV>
<DIV> </DIV>
<DIV>Thanks in advance</DIV>
<DIV>Raffle</DIV>
<DIV> </DIV>
<DIV>
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