Help needed in Raster/World file

[Ed McNierney]

Raffle -
 
gdalinfo is telling you that the upper left corner is at (-521, -371)
but you've put (-521, 371) in your tfw file.  Given your coordinates
that shouldn't matter much, however.  Could you post your MAP file so we
can see the EXTENT and other settings you're using?  That's a somewhat
unusual-looking raster image, but it should be OK if set up properly.
 
     - Ed
 
Ed McNierney
TopoZone.com

________________________________

From: raffle peter [mailto:raffle80 at yahoo.co.uk] 
Sent: Sunday, May 07, 2006 4:57 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Cc: Ed McNierney
Subject: Re: [UMN_MAPSERVER-USERS] Help needed in Raster/World file


Hi
  Yeha thats fine and i ahve used the values from my gdainfo to
 .tfw file but it all the same. But if i use the mapserver demo
  application's .tif file(Which is anyway not similar to projection
  that i am using) it is coming in the browser along with other
  layer. So i assume my values in the .tfw files are wrong. I have   
given the output of gdalinfo as well as the .tfw file below.
 
  @localhost# gdalinfo test.tif
   > Driver ....
   > Size is 1042, 722
   > Coordinate System is `'
   > Origin = (-521.000000, -371.000000)
   > Pixel Size = (1042.0000000, 742.0000000)
   >Metadata:
   >TIFF.........
   >........
   >........
   >TIFFFLAGXRESOLUTION = 96
   >TIFFFLAGYRESOLUTION = 96
   >TIFFFLAG-RESOLUTIONUNIT=2(PIXEL/INCH)
   >Corner Co-ordinates:
   > Upper left(-521.000, -371.000)
   > Lower left(-521.000, 535353.000)
   >Upper right(1085243.000, -371.000)
   >Lower Right(1085243.000, 535353.000)
   >center(542361.000, 267491.000)
And My test.tfw file for test.tif is something like this-->
  1042.0
  0.0
  0.0
  742.0
  -521
  371
 
 I have not used any projection statement in my 
mapfile/phpmapscript.
Plz. guide me. 
Raffle
 
On Sat, 06 May 2006 Ed McNierney wrote :
>Raffle -
>
>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:
>
>100.0
>0.0
>0.0
>-100.0
>12345.67
>987654.32
>
>    - Ed
>Ed McNierney
>President and Chief Mapmaker
>TopoZone.com / Maps a la carte, Inc.
>73 Princeton Street, Suite 305
>North Chelmsford, MA  01863
>Phone: +1 (978) 251-4242
>Fax: +1 (978) 251-1396
>ed at topozone.com
>
>
>________________________________
>
> From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU]
On
>Behalf Of raffle peter
>Sent: Saturday, May 06, 2006 9:07 AM
>To: MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: [UMN_MAPSERVER-USERS] Help needed in Raster/World file
>
>
>
>  Hi
>      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
>in their corresponding field.
>    Can anyone plz help me, how to get/set these values for the world
>file so that i can
>keep my raster data georeferenced with other layers in my mapfile.
>
>Thanks in advance
>Raffle
>
>
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