Hi Jody, Many thanks for that link – it should prove invaluable once I resolve the primary issue 😊 Thanks to others for suggestions - the primary issue appears to actually be related to the initial export from Arc Map 10.6 e.g. when the GeoTIFF is first created. The issue is a loss of quality (visually in pixellation) in the TIFF when working at a large scale (zoomed in). I’ve been exporting using Arc’s “300 dpi” setting with no compression. This might be off topic now but I wondered if anyone had experience / best practice when preparing GeoTIFF clips from Arc Map? Or perhaps there is a better tool like gdal or QGIS (I haven’t used these before). I’m working with large GeoTIFF “aerial frames” (800Mb) and satellite WMS layers and wish to export clipped GeoTIFF to specific buffers (500m) automatically.
I’ve compared exports against Arc Pro 2.8 which doesn’t have a “DPI” setting per se – only a resolution setting (width x height). When I set the resolution to match the Arc Map export, the resulting GeoTIFF does appear visually better and comparable to the original. All comments welcome! Kind Regards, Neil Saunders Business Consultant [cid:image001.png@01D77FA4.36709170] How was your Lotsearch experience? Click here<https://airtable.com/shrkB2wJTJQ52z6e9>. Lotsearch Pty Ltd Level 3, 68 Alfred Street, Milsons Point, NSW 2061 +61 (0)2 8287 0680 +61 (0) 413 379 883 supp...@lotsearch.com.au www.lotsearch.com.au CONFIDENTIAL INFORMATION This transmission may be privileged and may contain confidential information intended only for the recipient(s) named above. Any other distribution, re-transmission, copying or disclosure of this message is strictly prohibited. If you have received this transmission in error, please notify me immediately by telephone or return email, and delete this message from your system. Thank you. [LinkedIn]<https://linkedin.com/company/4823161> From: Jody Garnett <jody.garn...@gmail.com> Sent: Wednesday, 21 July 2021 4:09 PM To: Neil Saunders <neil.saund...@lotsearch.com.au> Cc: geoserver-users@lists.sourceforge.net Subject: Re: [Geoserver-users] Getting the best results with Raster Neil: Can you describe more in what way the quality is lacking? Is it distorted, or pixelated, or what? Did you do any data prep to your geotiff, say introduce an overview? If so what sampling technique did you use? What does "gdalinfo" return for your image? Some general guidance from Paul Ramsey is here https://blog.cleverelephant.ca/2015/02/geotiff-compression-for-dummies.html -- Jody Garnett On Tue, 20 Jul 2021 at 19:00, Neil Saunders <neil.saund...@lotsearch.com.au<mailto:neil.saund...@lotsearch.com.au>> wrote: Hi folks, Apologies if this is a basic question – I’m fairly new to GIS data. I’m using Geoserver 2.18.2 to host historical aerial clips and exporting the rasters with Arc Map 10.6 to Geotiff with a 500m buffer of a property. However I’m finding the quality of the image in Geoserver does not match the quality in Arc Map when zoomed in. I’ve tried exporting at different DPI but find 300 or above has no discernible improvement. I’m not using any compression when creating the TIFF and using GeoTIFF Tags. I’ve read about resampling and how it can alter the image quality but not sure if that’s it. Assuming this is not a new challenge, I’m curious what steps others have taken to get raster clips into Geoserver in a way that doesn’t compromise the image quality? I’m using the most detailed historical aerial photography as the use case requires inspection of features at the street level. Any help gratefully received! Kind Regards, Neil Saunders Business Consultant [cid:image001.png@01D77FA4.36709170] How was your Lotsearch experience? Click here<https://airtable.com/shrkB2wJTJQ52z6e9>. Lotsearch Pty Ltd Level 3, 68 Alfred Street, Milsons Point, NSW 2061 +61 (0)2 8287 0680 +61 (0) 413 379 883 supp...@lotsearch.com.au<mailto:supp...@lotsearch.com.au> www.lotsearch.com.au<http://www.lotsearch.com.au> CONFIDENTIAL INFORMATION This transmission may be privileged and may contain confidential information intended only for the recipient(s) named above. Any other distribution, re-transmission, copying or disclosure of this message is strictly prohibited. If you have received this transmission in error, please notify me immediately by telephone or return email, and delete this message from your system. Thank you. [LinkedIn]<https://linkedin.com/company/4823161> _______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html If you want to request a feature or an improvement, also see this: https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer Geoserver-users@lists.sourceforge.net<mailto:Geoserver-users@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/geoserver-users
_______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html If you want to request a feature or an improvement, also see this: https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer Geoserver-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geoserver-users
