[Mapserver-users] Mapserver and POSTGIS and RASTER layer

[Rosangela Silva]

Ok. For who have the Paintshop program,
in File...Batch Conversion option is possible to convert
several JPG to Tiff (uncompressed) easyly.
----- Original Message -----
From: "Paul Ramsey" <pramsey at refractions.net>
To: "Rosangela Silva" <rosangela.silva at zenitpolar.com.br>
Cc: <mapserver-users at lists.gis.umn.edu>
Sent: Friday, April 25, 2003 3:02 PM
Subject: Re: [Mapserver-users] Mapserver and POSTGIS and RASTER layer


> Rosangela,
> If there is any way you can convert your raster data to TIFF instead of
> JPG you will find your performance is much improved. Mapserver can
> quickly do random access of data within TIFF files, but for "naive
> compressed" formats like JPEG and PNG it has to uncompress the whole
> file before it can access particular areas of the image. For larger
> images this can cause a great deal of overhead and slow things down alot.
> Paul
>
> Rosangela Silva wrote:
> > Paul,
> > I did a test with TILEINDEX and shape files and it's running. (Good!!)
> > I think that (for while) it's solve my problem with mapserver and raster
> > data.
> > I don't know yet about performance, but I do some more testes and with
> > jpg files too.
> > Thanks
> > Rosângela.
> > ----- Original Message -----
> > From: "Paul Ramsey" <pramsey at refractions.net>
> > To: "Rosangela Silva" <rosangela.silva at zenitpolar.com.br>
> > Sent: Wednesday, April 23, 2003 9:31 PM
> > Subject: Re: [Mapserver-users] Mapserver and POSTGIS and RASTER layer
> >
> >>Ah. Now *that* is possible with current mapserver. You do not get to
> >>manage your data in a database, but it can be done. You will want to
> >>create a "tiled" data set. I believe that gdal includes a utility to
> >>turn a set of images into a shape index tile which can be used to create
> >>a tiled raster layer. I have used this to create a complete hillshading
> >>of BC out of 350 raster files.
> >>
> >>Rosangela Silva wrote:
> >>
> >>>Unhappyly I cannot finance the development of this project, but I need
> > to find a solution for this problem in a short time. Does someone have
this
> >>>problem???
> >>>But is possible in Mapserver do something like this:
> >>>LAYER #Raster
> >>>NAME "sp_images"
> >>>=>>>DATA "sp1.tif"  AND "sp2.tif" AND "sp3.tif"   ????
> >>>STATUS DEFAULT
> >>>TYPE RASTER
> >>>END
>
> --
>        __
>       /
>       | Paul Ramsey
>       | Refractions Research
>       | Email: pramsey at refractions.net
>       | Phone: (250) 885-0632
>       \_
>
>