Raster Image and Shapefile Alignment

[Bradley Mclain]

@Richard: I tried using those tools you listed but no luck, the outputted 
image was of poor quality and still did not aline correctly.

@Mailing List: My .tiff file comes with a .tfw (world file) is it possible 
to use this to change the georeferencing using? Does mapserver use the world 
file?

Brad




>From: Richard Duivenvoorde <rdmailings at DUIF.NET>
>Reply-To: Richard Duivenvoorde <rdmailings at DUIF.NET>
>To: MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: Re: [UMN_MAPSERVER-USERS] Raster Image and Shapefile Alignment
>Date: Mon, 5 Feb 2007 15:44:51 +0100
>
>Hi Bradley,
>
>I managed to georeference some rasters I had using the free tools listed 
>here:
>http://www.forestpal.com/Help/georeference.html
>
>Richard
>
>
>Bradley Mclain wrote:
>>How would you suggest I go about re-doing the georeferencing?
>>
>>Brad
>>
>>
>>
>>
>>
>>>From: Barend Köbben <kobben at itc.nl>
>>>To: Bradley Mclain <bradleym06 at HOTMAIL.COM>
>>>Subject: Re: [UMN_MAPSERVER-USERS] Raster Image and Shapefile Alignment
>>>Date: Fri, 02 Feb 2007 09:19:33 +0100
>>>
>>>HI,
>>>
>>>The shapefile is in an Australian projection, and your raster has been
>>>georeferenced to *something*, but there's no telling to what projection 
>>>they
>>>georef'd it, because there's no projection info in the raster file.
>>>
>>>In other words: someone told the raster "you fit in this place in the 
>>>world,
>>>between XY 1 and XY 2", but they didn't specify in what projection system
>>>those XY's are. You would suppose to the same projection the vector is 
>>>in,
>>>and in that case, the fit will be OK as long as the projection of the 
>>>shape
>>>remains the same as it was when the raster was georef'd to it. But if one
>>>changes that projection, or maybe only the Datum, as tends to happen
>>>unexpectedly when you transfer files from one GIS to another, things will
>>>misalign...
>>>
>>>To make matters worse, it can also just be a case of sloppy
>>>georeferencing...
>>>
>>>Without knowing the rasterprojection, there's no solution, except 
>>>re-doing
>>>the georeferencing...
>>>
>>>On 02-02-2007 07:16, "Bradley Mclain" <bradleym06 at HOTMAIL.COM> wrote:
>>>
>>> > Umm I know very little about geodata so i'll simply attach the 
>>>readouts from
>>> > ogrinfo and gdalinfo so you can see for yourself cause i have no idea. 
>>>:)
>>> >
>>> > If it helps any they are only out slightly. (as shown in attached
>>> > screenshot)
>>> >
>>> > Bradley Mclain
>>> >
>>> >
>>> >
>>> >
>>> >> From: "Gregor Mosheh" <gregor at hostgis.com>
>>> >> Reply-To: support at hostgis.com
>>> >> To: "Brad_Mclain" <bradleym06 at HOTMAIL.COM>
>>> >> CC: mapserver-users at lists.umn.edu
>>> >> Subject: Re: [UMN_MAPSERVER-USERS] Raster Image and Shapefile 
>>>Alignment
>>> >> Date: Thu, 1 Feb 2007 23:02:05 -0700 (MST)
>>> >>
>>> >>> Ok here is the sitution I have a raster image and shapefile data but 
>>>the
>>> >>> two do not line up correctly.
>>> >>
>>> >> Are you positive that they're both in the same projection? Or, do you 
>>>know
>>> >> the projection for each one? I've had so many annoyances in the past 
>>>where
>>> >> something was in "CA State Plane II" and then had to figure out which 
>>>of
>>> >> the five CA State Plane II projections it really was. :)
>>> >>
>>> >> If you know the projection for each, be sure to specify it in your 
>>>mapfile
>>> >> using a PROJECTION block in your LAYER block. You can probably get 
>>>more
>>> >> help on that once we know a bit more about the matter.
>>> >>
>>> >> Best of luck, Brad.
>>> >>
>>> >> -G
>>> >>
>>> >
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