[mapserver-users] Just starting out...

[tuckeratwork]

I'm sorry to reply to this - my subscription hadn't been accepted and the
posting was rejected.  I'm hoping that a reply will get through.  I'm
copying the entire posting only because it was originally rejected.


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tuckeratwork wrote:
> 
> I'm just starting out on a project involving raster maps.  I'm looking for
> some basic guidance about things to consider - this is all pretty new to
> me.
> 
> I've read the Raster Data Access document written by Frank Warmerdam. 
> That was very well written and an excellent resource.
> 
> My project involves loading a large set of overlapping nautical charts
> from the UKHO with the objective of creating Google Maps/OSM-compatible
> tiles.  All of the charts are in GeoTiff format and are in various scales
> and projections.  They are non-rectangular and some have cutouts (which
> were originally inset charts cut out into other GeoTiff files).  Charts
> with higher detail obviously overlap charts of lower detail.
> 
> My current thought is to load everything into MapServer and then extract
> the tiles needed and store them.  Use of MapServer would be for internal
> use only - I'm only interested in creating the tiles in png format.  The
> thing that I think MapServer will give me is the "quilting" together of
> the different maps to create merged tiles.  While most tiles are trivial,
> the tiles at the borders are very complex because they need to be merged
> with an underlying map possibly at a different scale (with a potential
> non-square border).
> 
> A really good example of this with US NOAA nautical charts can be seen at:
>  http://www.geogarage.com/main/examples.html.en#noaa
> http://www.geogarage.com/main/examples.html.en#noaa 
> 
> As you zoom in there, you'll notice how the charts are all merged together
> even though some tiles contain imagery from different scaled original
> data.
> 
> A few questions fall out of this:
> 
> 1. Is this a reasonable way to accomplish this task?  There are Google
> tile cutters which would be great for cutting a single GeoTiff file - but
> then I'd have the "quilting" issue to deal with between multiple sets of
> tiles.  MapServer seems like it'll do that quilting for me.
> 
> 2. Can I define non-rectangular boundaries in the source data including
> cutouts?  Will MapServer quilt the other raster data to those boundaries
> and inside the cutouts?
> 
> 3. Are there any other resources that I should be reading and learning
> about?
> 
> 
> Thank you so much for any information you can provide.  I'm sorry if some
> of these questions are so very basic.  I promise to try to be an active
> member of the community as I learn enough to have something to contribute.
> 
> Best regards,
> 
> Tucker
> 
> 
> 
> 
> 
> 

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