[mapserver-users] Gallery: running mapserver in docker on kubernetes

[Peter Schmitt]

Hi Jan,

On Fri, Aug 30, 2019 at 6:20 AM Jan Hartmann <j.l.h.hartmann at uva.nl> 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
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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