Improve WMS Server Performance

[Kyle Mulka]

Frank Warmerdam wrote:

>The short answer is that you should convert the data to an
>internally tiled format, and then build overviews.
>
>eg.
>gdal_translate -co TILED=YES your.tif tiled.tif
>gdaladdo tiled.tif 2 4 8 16 32 64 128 256
>
>  
>
That seemed to work pretty well after I first converted my jpegs to 
geotiffs using gdal_translate. It didn't work at all (took hours) trying 
to go directly from jpeg to tiled tiff.

Now, I'm having a problem at the borders of both the original tiles and 
the rended tiles from mapsever:
http://maps.kylemulka.com/spot/

You should notice that the initial map you see when the page first loads 
looks fine. Then, zoom out and you will see two white lines. Any way to 
fix that?

I used gdaltindex to create a shapefile which I then put into my mapfile:

MAP
    NAME "SpotAerialImagery"
    IMAGETYPE jpeg
    EXTENT -180 -90 180 90
    SHAPEPATH "/maps/spot/"
    PROJECTION
        "init=epsg:4326"
    END
    WEB
        METADATA
            "wms_title"  "SpotAerialImagery"
            "wms_onlineresource"    
"http://kylemulka.com:81/cgi-bin/mapserv?map=/maps/spot/spot.map&"
            "wms_srs"    "EPSG:4326"
        END
    END
  LAYER
    NAME "aerial"
    STATUS ON
    TILEINDEX "spot.shp"
    TILEITEM "Location"
    #OFFSITE 0 0 0
    TYPE RASTER
    PROJECTION
        "init=epsg:4326"
    END
  END
END

-Kyle