Hi all! I would like to discuss best practice for serving rather large amounts of aerial imagery (ie orthophotos). My setup is Geoserver 2.16 on a local Windows Server. I also have PostgreSQL 10.5/Postgis 2.4.4 running on the same server, but that is not used for imagery at this point.
Imagery is stored in uncompressed geotifs, ~300MB each, and there are 150-250 of these per year so it adds up to hundreds of GB’s. Disk space on the server is already an issue but can be augmented. I have FME and lots of experience working with aerial imagery, but less experience from imagery on Geoserver. I have figured out and tested three approaches and will list them with the pros and cons I have found so far. They are not in order of preference or anything. Less disk space is more important than necessary bandwidth, but overall performance is important. 1/ Use ImageMosaic and serve one folder of tiffs per year. Pros: No file processing necessary, deliveries can simply be dumped in a folder. Folder doubles as data storage if original files need to be retrieved. Original resolution is unchanged. Cons: Will need huge amounts of disk space. Despite some tiles tweaking, very slow performance, esp at small scales. 2/ Mosaic the image files into one ECW file with the original resolution and serve that from an ECW store. Pros: Will take up significantly (1/5-1/10) less disk space. Very fast performance, regardless of scale. Cons: Time consuming file processing, but a one-time job. Original files will need storage elsewhere. Possible licensing limitations on the ecw software. 3/ Mosaic the image files into one JP2k file and serve that from a JP2ECW store. Pros: Will take up much less disk space, but more than ECW. No licensing issues. Cons: Time consuming file processing, but a one-time job. Original files need storage elsewhere. Slightly slower performance than ECW. In a case like this, what is a generally agreed best practice? All hints and suggestions are most welcome. Maybe there are better alternatives than the above? PostGIS raster storage maybe? Thanks in advance and best regards, Mats.E *GisKraft*, GIS och webbkonsult Mats Elfström, Väpplingvägen 21, SE-227 38 LUND, Sweden tel: +46 70 595 39 35 / web: www.giskraft.com
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