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#geotiff

0 posts0 participants0 posts today
Public
Bertrand Caron

Salut les cartographes numériques ! Si vous avez un instant pour jeter un coup d’œil à notre description de #GeoTIFF dans une perspective de préservation à long terme (rappel : la fiche fournit un niveau d'info minimal sur les caractéristiques génériques du format mais s'appesantit surtout sur ce qu'on considère être un risque de préservation) :

github.com/hackathonBnF/Fiches

On prend les critiques et les corrections ! (je me permets notamment de pinger @EvenRouault là-dessus...)

GitHubGeoTIFFDescription des formats de fichier. Contribute to hackathonBnF/FichesFormat development by creating an account on GitHub.
#DigiPres_FR
Public *
💧🌏 Greg Cocks

Updates To New Zealand Topo50 Map Coverage - Toitū Te Whenua Land Information New Zealand
--
linkedin.com/posts/toit%C5%AB- <-- shared post
--
linz.govt.nz/products-services <-- Topo50 NZ Map Chooser
--
linz.govt.nz/products-services <-- Topo50 map example - BS24 - Mount Robert
--
H/T Toitū Te Whenua Land Information New Zealand
#GIS #spatial #mapping #map #papermap #geotiff #opendata #NewZealand #coverage #usecase #Topo50 #download #topographic #AI #machinelearning #emergencyresponse #planning #urbanplanning #tramping #tourism #leisure
@Toitū Te Whenua Land Information New Zealand @LINZ

web page screen shot - LINZ Topo50 New Zealand topo maps download functionality
screen shot - New Zealand GeoTiff LINZ Topo50 map example added to QGIS
GIF
graphic - LINZ Topo50 map example - Mount Ruapehu, New Zealand
Public *
Mike Treglia

cloud optimized #geotiff (#cog) question:
I've got a layer that renders fine in @qgis when is stored in a local drive & from a S3 URL.

But when its on a network drive (well, a "drive" through an S3 storage gateway), I get the following when zooming in:
[layername]: IReadBlock failed at X offset 21, Y offset 22: TIFFReadEncodedTile() failed.

Thought maybe its a file system thing & I need to use #gdal virtual file system paths, but not getting that to work at all. Any ideas? #gischat

Continued thread
Public
Sarah Dal

I've used @pwramsey brilliantly simple how-to guide on geotiff compression for a few years now, it makes large orthomosaics easily viewable with no loss of quality. I got a 3gb geotiff down to 300mb!

blog.cleverelephant.ca/2015/02

Paul Ramsey · GeoTiff Compression for DummiesUpdated: August 2022 “What’s the best image format for map serving?” they ask me, shortly after I tell them not to serve their images from inside a database. “Is it MrSid? Or ECW? those are nice and small.” Which indeed they are. Unfortunately, outside of proprietary image server software I’ve never seen them be fast and nice and small at the same time. Generally the decode step is incredibly...
#Geotiff#GIS
Public
Sarah Dal

For GIS beginners like me, I've found this simple website absolutely invaluable for compressing large orthomosaics. I just got a 6.6gb tif down to 516mb! I've never found anywhere else that explains it so simply.

blog.cleverelephant.ca/2015/02

Paul Ramsey · GeoTiff Compression for DummiesUpdated: August 2022 “What’s the best image format for map serving?” they ask me, shortly after I tell them not to serve their images from inside a database. “Is it MrSid? Or ECW? those are nice and small.” Which indeed they are. Unfortunately, outside of proprietary image server software I’ve never seen them be fast and nice and small at the same time. Generally the decode step is incredibly...
#GIS#gdal#QGIS
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