[mapserver-users] Problem display digital raster graphics(drg)

[Jason Wolfe]

The compression is PackBits for both sets of data.  Any suggestions?

Ed McNierney wrote:

> Jason -
>
> Which "compressed TIF format" are you using?  There are two - PackBits
> and LZW.  The standard libtiff library only supports PackBits
> compression due to Unisys patent requirements.  Is it possible that your
> orthoquads are PackBits and your DRGs are LZW?
>
>         - Ed
>
> Ed McNierney
> Chief Mapmaker
> TopoZone.com
> ed at topozone.com
> (978) 251-4242
>
> -----Original Message-----
> From: Jason Wolfe [mailto:jwolfe at sdimaps.com]
> Sent: Monday, March 04, 2002 9:54 AM
> To: mapserver-users at lists.gis.umn.edu
> Subject: [mapserver-users] Problem display digital raster graphics(drg)
>
> I have been trying to solve this issue for awhile, but can not seem to
> figure out what is going on.
>
> I have no problem displaying shapefiles,digital ortho quads in
> compressed tif format.
> But I can not display a digital raster graphic(drg) in compressed tif
> format.
> Something is happening in the conversion process from tif to either jpeg
> or png.
> I have two different images I am testing with, neither one will display
> and the output jpg/png for both images are the exact same size.  This
> does not make any since, I have tried everything I can think of.  Does
> anyone have any other suggestions?
> I don't think it is a .map issue, but just in case here is my .map:
>
> MAP
>   NAME DRGVIEWER
>   EXTENT 678106.875 3458540.750 690518.813 3473092.500
> #  EXTENT -108 30 -110 32
>   SIZE 400 400
>   SHAPEPATH "../downloads/drgs/24k/clipped"
>   STATUS ON
>   IMAGETYPE jpeg
>   UNITS meters
>  IMAGECOLOR 64 105 255
> # IMAGETYPE tiff
>   WEB
>     IMAGEPATH "/var/www/html/tmp/"
>     IMAGEURL "/tmp/"
>     TEMPLATE drg.html
> #    LOG "/tmp/log.dat"
>   END
>
>   LAYER
>     NAME drg_g1
>     DATA "31109c1c.tif"
>     TYPE RASTER
>     LABELCACHE ON
>     POSTLABELCACHE TRUE
>     STATUS ON
>     CLASS
>      NAME '31109c1cg.tif'
>      backgroundcolor 56 56 56
>      COLOR 124 124 124
>      outlinecolor 0 0 0
> #     TEMPLATE counties.html
>     END
>   END
> END
>
> Thanks in advance for the help,
>
> Jason