[mapserver-users] Matching .TFW file with EXTENT parameter?

[kreshna_iceheart at yahoo.com]

Thanks, folks. But how do I know my x-pixel resolution? And y-pixel resolution? Can it be derived from EXTENT parameters?

Thanks again,
-Kresh


--- On Mon, 11/3/08, Robert Sanson <SansonR at asurequality.com> wrote:

> From: Robert Sanson <SansonR at asurequality.com>
> Subject: Re: [mapserver-users] Matching .TFW file with EXTENT parameter?
> To: mapserver-users at lists.osgeo.org, kreshna_iceheart at yahoo.com
> Date: Monday, November 3, 2008, 2:35 PM
> Hi Kresh
> Tiff World File (.tfw) 
> 6 rows:
> First row is x-pixel resolution (width in your coordinate
> system)
> Second and third rows are so-called "rotational
> components" but are set to zero in the case of an
> unrotated mapsheet.
> The fourth row is the y-pixel resolution (dimension in
> coordiantes). The negative sign indicates that the image
> y-axis is positive down which is the opposite from real
> world coordinates.
> The 5th and 6th rows are the Easting and Northing of the
> middle of the upper left pixel
> Robert
> 
> >>> "kreshna_iceheart at yahoo.com"
> <kreshna_iceheart at yahoo.com> 3/11/2008 8:19 p.m.
> >>>
> I have a map file with following MapExtent parameter:
>   EXTENT 106.335006 -6.896956 107.315811 -5.983994
> 
> Recently, I got a TIFF file without coordinates. I plan to
> use the TIFF file with my map. Thus, I'm supposed to
> create a .TFW file using text editor, am I correct?
> 
> Problem is: I'm not sure what parameter to be put in
> the .TFW file. Here is the parameters I put in my TFW file
> so far:
>       1.000
>       0.000
>       0.000
>      -1.000
>     106.335006
>      -5.983994
> 
> And I failed to show the raster on my map.
> 
> Please note that I am merely guessing. It seems that the
> fifth and the sixth like of the TFW should be the leftmost
> and rightmost number of my EXTENT parameter, respectively,
> but I have no idea what the first four lines are for. 
> 
> Based on EXTENT parameter above, what the correct .TFW
> values should be? Many thanks,
> 
> -Kresh
> 
> 
> 
> 
>       
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