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List:       mapserver-users
Subject:    Re: [mapserver-users] Raster performance hints
From:       Stephen Woodbridge <stephenwoodbridge37 () gmail ! com>
Date:       2018-11-06 23:54:13
Message-ID: 623504C3-BF5E-4B10-B0A0-6173C89172E1 () gmail ! com
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I've had excellent results using jpeg YCBR in geotiff compression. It make small \
files, supports overviews and is fast. Building a custom overview layer is a good \
idea and save a lot in response time over opening a large number if files. 

-Steve W

Sent from my iPhone

> On Nov 6, 2018, at 1:24 PM, Ziegler Stefan <Stefan.Ziegler@bd.so.ch> wrote:
> 
> Hi
> 
> We are using MapServer for vector data stored in a PostgreSQL/PostGIS database. For \
> a new project we are planning to provide a WMS based on raster layers and therefore \
> in need of some performance hints or your experiences. 
> The raw data will be a lot of single GeoTIFF (aerials, hillshading, slopes, etc.) \
> files, like 5'000 - 10'000 from different organizations. Since the originate from \
> different organizations it's possible that they can have different resolutions. \
> Conceptionally for aerials it would look like this: 
> Aerial group
> > _ aerial from organization one (1000 single tiffs, resolution 10cm, approx 10k x \
> > 10k pixels)
> > _ aerial from organization two (600 single tiffs, resolution, 12.5 cm, approx 10k \
> > x 10k pixels)
> > _ aerial from organization three (3000 single tiffs, resolution, 10 cm, approx \
> > 10k x 10k pixels)
> 
> For some hundred single GeoTIFFs we have good experience with the Tileindex \
> approach and an handmade external overview that kicks in at smaller scale. 
> Will this approach still work with a massive amount of single tiffs? Or are the \
> better ones? What about the compression (quality vs. decompression speed vs. disk \
> space?) Or would you expect a much better performance with - let's say - a BigTIFF \
> for each organisation? 
> Thanks for any hints.
> 
> Best regards
> Stefan
> 
> Freundliche Grüsse
> 
> Stefan Ziegler 
> Kantonsgeometer / Leiter Amt für Geoinformation
> 
> Amt für Geoinformation
> Rötistrasse 4 
> 4500 Solothurn 
> 
> Telefon +41 32 627 75 96
> stefan.ziegler@bd.so.ch
> http://www.so.ch 
> 
> 
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