[OpenLayers-Dev] singleTile optimization

Dan Little danlittle at yahoo.com
Thu Oct 4 08:28:11 EDT 2007

Yikes, first time poster!

I think the speed to generate a single tile is wholely dependent on the map-rendering engine and the dataset.

For example, here at the City of Saint Paul, our streets layer is entirely vector.  I can generate a very very large tile with highly detailed streets for the entire city using Mapserver in less than 1/3 of a second.  Given the nature of MapServer, and the size of the shapefile which stores our streets layer, multiple tiles is much much slower (as the shapefile needs to be read from disk and loaded to memory for each rendered tile).  It would be nice to have some of the effects of tiling without the high-cost it currently presents in rendering performance. 

Dan "Ducky" Little
City of Saint Paul / Public Works / GIS

----- Original Message ----
From: Stephen Woodbridge <woodbri at swoodbridge.com>
To: pspencer at dmsolutions.ca
Cc: dev at openlayers.org
Sent: Wednesday, October 3, 2007 9:37:29 PM
Subject: Re: [OpenLayers-Dev] singleTile optimization

pspencer at dmsolutions.ca wrote:
> What do you think about aligning singleTile bounds to the grid to
> promote cacheability in the client?

I think that this should be an option in the layer definition if it gets 
done. I can see some benefits to doing this, but the down side is that 
all images generated will be larger and slower to generate and the 
singleTile option needs to support more than one use case in my mind anyway.

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