Re: PROJ grid files CDN
Clifford J Mugnier <[email protected]>
| Newsgroups | gmane.comp.gis.proj-4.devel |
|---|---|
| Message-ID | <SN6PR06MB47019EAB2EDF215DF87A9009A8B30@SN6PR06MB4701.namprd06.prod.outlook.com> |
Speaking of grids ... NGS has officially released GEOID18 this week for CONUS. Clifford J. Mugnier, c.p., c.m.s. Chief of Geodesy LSU Center for GeoInformatics (ERAD 266) Dept. of Civil Engineering (P.F. Taylor 3531) LOUISIANA STATE UNIVERSITY Baton Rouge, LA 70803 Academic: (225) 578-8536 Research: (225) 578-4578 Cell: (225) 328-8975 honorary lifetime member, lsps fellow emeritus, asprs member, apsg ________________________________ From: PROJ <[email protected]> on behalf of Even Rouault <[email protected]> Sent: Friday, September 13, 2019 4:24 PM To: [email protected] <[email protected]> Subject: Re: [PROJ] PROJ grid files CDN > I think I'll be in roughly the same situation as QGIS developers. Have you > and Howard considered grids-on-demand as a PROJ API that developers could > use in QGIS or Rasterio or gdalwarp? Or as a service like DNS? Something > about having it built into the library feels not right to me. I have imagined that the network layer could be an interface, with a default libcurl implementation, that applications/libraries could subsitute with their own. As some grids can be pretty big and we don't necessarily want to download them in their entirety, that could be something like DownloadRange(url, start_offset, length) One use case where this solution is kind of compulsory is if you have to do coordinate reprojection in a context like AWS Lambda with a very small footprint for the application. > I'm trying to > think of a precedent for this and am drawing a blank. On your phone, you have the Maps app, but this is just the app: the map content is stored remotely, and you have to connect if the area of interest is not in the cache. -- Spatialys - Geospatial professional services https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.spatialys.com&data=02%7C01%7Ccjmce%40lsu.edu%7C5aec19e54c82469ca61808d73890cfaa%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C1%7C637040066935026197&sdata=g82a9EVFDu%2BdiVaGtPdTAQODd1uO7sLbNG4dGgDMmOo%3D&reserved=0 _______________________________________________ PROJ mailing list [email protected] https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.osgeo.org%2Fmailman%2Flistinfo%2Fproj&data=02%7C01%7Ccjmce%40lsu.edu%7C5aec19e54c82469ca61808d73890cfaa%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C1%7C637040066935026197&sdata=zs9eDbIrcZ5ioMWdI%2BVxAtNB%2Fqf7Zit5VahcpgdBBo8%3D&reserved=0 _______________________________________________ PROJ mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/proj