Re: Gallery: running mapserver in docker on kubernetes

Thanks Peter, this is really useful. Do you have any real-world 
benchmarks for MapServer that compare regular file access with vsicurl 
access, using optimized Geotifs? I've seen the tests for GDAL at 
https://trac.osgeo.org/gdal/wiki/CloudOptimizedGeoTIFF, but what about 
servering  large map-sets over the web?

On 8/30/2019 5:20 PM, Peter Schmitt wrote:
> Hi Jan,
>
> On Fri, Aug 30, 2019 at 6:20 AM Jan Hartmann <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     Hi Pete, could you explain what you mean by "cloud-optimized geotiffs?
>
>
> A Cloud Optimized GeoTIFF (COG) is a regular GeoTIFF file in which the 
> data is structured for fast random access.  Some properties of a COG 
> have always been useful for MapServer (Internally tiled & images have 
> overview levels).  Other properties of a COG optimize for cloud access 
> via GDAL's /vsicurl/ virtual filesystem (Image File Directories of the 
> GeoTIFF are structured such that one HTTP request can fetch all the 
> metadata needed to read subsequent blocks from an image).  This layout 
> has been codified somewhat recently... Find out more here:
>
> 1. The COGEO organization summarizes things: https://www.cogeo.org 
> <https://www.cogeo.org/>
> 2. This GDAL page talks about how to take a normal GeoTIFF, make it a 
> COG and how to validate that a given GeoTIFF is a COG: 
> https://trac.osgeo.org/gdal/wiki/CloudOptimizedGeoTIFF
> 3. GDAL >= 3.1 will have a new COG driver. This provides some 
> syntactic sugar to generating a COG in a single gdal_translate 
> command. https://gdal.org/drivers/raster/cog.html
>
> Cheers,
> Pete
>

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