[mapserver-users] Raster dataset recommendations

[Jean-François Gigand]

Back after a few weeks...
You are right obviously. That time, I did not spend time further than
gdaladdo and tiled tiffs.
I thought the reprojection could be equally made statically with
gdalwarp or at mapserver level, considering that map tiles are cached.
And also because I was probably running out of space for another 400
Go, since I wanted to keep the original projection as well, for other
uses.

Thinking of the raster process, it is obvious that reprojecting all
tiffs once is a lot faster, for generating all map tiles, than
requesting MapServer to do it, because every TIFF is used multiple
times.

Thanks Edi for your advise.
"you dont need more than four tiles to display the image"
This rule is enough to make decisions on how to build the pyramidal structure.
Of course, benches needs to be made, and every aspect is important,
including the FS type, HD technology and the whole...

About PostGIS raster and TIFFs, I don't get any clear feedback...
Probably because PostGIS hasn't been used a lot for rasters so far...
I will make my own experiments, then.
Will give feedback here.

JF


2011/2/26 Jeff McKenna <jmckenna at gatewaygeomatics.com>:
> On 11-02-25 6:02 PM, Jean-François Gigand wrote:
>>
>> I take the opportunity of this topic to ask a similar question.
>> I have a larger data set (400 Go) in about 24000 GeoTIFFs files, using
>> the method described by Edi (tiled, internal overviews, index shape).
>> It works pretty well (older version of MapServer), with on-the-fly
>> reprojection, quick enough when the resolution is small-enough.
>
> Hi JF,
>
> You mentioned reprojecting...why would you force MapServer to reproject all
> those files on-the-fly?  I would never recommend that, for speed
> considerations.  I would invest some time in a gdalwarp script.
>
> That was my thought when reading your message :)
>
> -jeff
>
>
> --
> Jeff McKenna
> MapServer Consulting and Training Services
> http://www.gatewaygeomatics.com/
>
>
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