[udig-devel] tif render error.

[cedric]

This link might help
http://geoserver.org/display/GEOSDOC/Using+the+ImageMosaic+plugin

Cedric

Vince Darley a écrit :
> At 19:47 03/03/2008, Jody Garnett wrote:
>> We are going to have to experiment and see; as far as I know:
>> - GeoTIFF
>> - World + Image (with additional support of a "prj" file if you need 
>> to be exact about your coordinate reference system)
>>> My basic vector map data (roads, locations, routes, etc) is all 
>>> lat/lon based, and my map is therefore using WGS84.
>> And your data is also set for WGS84? ie if it has shapefiles that is 
>> what the .prj file says? If it is is PostGIS the SRID=4326 etc...
>
> All the vector data is in PostGIS, with SRID=4326.  We don't use any 
> shapefiles, in general.
>
>>> The raster tiles I have come with files that look like this:
>>>
>>> tf70ne.tfw:
>>>
>>> 0.635001270002540
>>> 0.000000000000000
>>> 0.000000000000000
>>> -0.635001270002540
>>> 575000.317500635000000
>>> 309999.682499365000000
>>>
>>> tf70ne.tab:
>>>
>>> !table
>>> !version 300
>>> !charset WindowsLatin1
>>>
>>> Definition Table
>>>   File "TF70NE.TIF"
>>>   Type "RASTER"
>>>   (575000,305000) (0,7874) Label "Pt 1",
>>>   (580000,305000) (7874,7874) Label "Pt 2",
>>>   (580000,310000) (7874,0) Label "Pt 3",
>>>   (575000,310000) (0,0) Label "Pt 4"
>>>   CoordSys Earth Projection 8, 79, "m", -2, 49, 0.9996012717, 
>>> 400000, -100000
>>>   Units "m"
>> It looks to me like you are mixing two things: GeoTIFF (where the 
>> details are encoded in the tiff file) and world plus image; where the 
>> details are defined in files with the same base filename as the tiff.
>
> Hmm.  How can I tell whether the tiff files have the geographic 
> details encoded?  My colleague who was looking at this told me that 
> nothing at all worked until he got hold of the tfw/tab files from OS.
>
>> Can you make yourself a ".prj" file using the Well Known Text 
>> available on the advanced tab of the CoordinateReferneceSystem dialog 
>> in uDig?
>
> Can you explain more precisely what I have to do, and then I expect I 
> can do that.
>
>>> Unfortunately when I import one of these images and add it to my 
>>> map, it isn't placed anywhere near the other data, because it seems 
>>> to be using coordinates (British National Grid?) in the range 
>>> 575000, 305000.
>> I see that number (575000) in both your tfw file and your definition 
>> table? Are you defining the range of three axis? Or only two ...
>
> I'm not really sure.  These are all just standard OS data, and I'm 
> just trying to use it.
>
>>> On a related note, there are about a thousand of these tiles.  How 
>>> can I add them to the map in one go (and have them shown in the uDig 
>>> user interface as one entity) rather than as a thousand separate 
>>> layers in the map.
>> On trunk I have support for "Image Moasic" basically a shapefile with 
>> each record indicating what "tile" goes there .. that is the "right" 
>> way to do things; and I am afraid it is not available in 1.1.x.
>
> Is it worth me testing out trunk?  Or is that just going to hit a 
> bunch of other issues?  (is there a trunk sdk available for testing 
> with?)
>
> regards,
>
> Vince.
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