Hi Folks,
Does r.external generate overviews during the linking process?
Doug
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On Wed, Dec 16, 2020 at 2:26 PM Newcomb, Doug via grass-dev
<grass-dev@lists.osgeo.org> wrote:
Hi Folks,
Does r.external generate overviews during the linking process?
I don't think so.
There is no sign of it in
https://github.com/OSGeo/grass/blob/master/lib/raster/gdal.c
or
https://github.com/OSGeo/grass/blob/master/raster/r.external/link.c
Markus
I ask because I have created a 55 billion pixel vrt of elevation data. I linked it to a GRASS mapset . It did take an hour to link , but the zooming and panning is reasonably responsive afterwards.
Doug
From: Markus Neteler neteler@osgeo.org
Sent: Wednesday, December 23, 2020 4:51 PM
To: Newcomb, Doug doug_newcomb@fws.gov
Cc: grass-dev@lists.osgeo.org grass-dev@lists.osgeo.org
Subject: [EXTERNAL] Re: [GRASS-dev] r.external cache or add overviews?
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On Wed, Dec 16, 2020 at 2:26 PM Newcomb, Doug via grass-dev
grass-dev@lists.osgeo.org wrote:
Hi Folks,
Does r.external generate overviews during the linking process?
I don’t think so.
There is no sign of it in
https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FOSGeo%2Fgrass%2Fblob%2Fmaster%2Flib%2Fraster%2Fgdal.c&data=04%7C01%7Cdoug_newcomb%40fws.gov%7C4f0883ee7d50465461ea08d8a78cf995%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637443571215425088%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Qqzy%2BTGm%2FTciBVpdomqzSW6vcggZMD9vfmvQSV4FDiE%3D&reserved=0
or
https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FOSGeo%2Fgrass%2Fblob%2Fmaster%2Fraster%2Fr.external%2Flink.c&data=04%7C01%7Cdoug_newcomb%40fws.gov%7C4f0883ee7d50465461ea08d8a78cf995%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637443571215425088%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=vQs7F7GNkdpppxsX5iakyWEA64%2FivjqvZx1pbabnFkY%3D&reserved=0
Markus
On Mon, Dec 28, 2020 at 1:54 PM Newcomb, Doug <doug_newcomb@fws.gov> wrote:
I ask because I have created a 55 billion pixel vrt of elevation data. I linked it to a GRASS mapset . It did take an hour to link ,
I think that most of the time during linking in r.external results
from the computation of the exact stats, not approximations for each
band.
but the zooming and panning is reasonably responsive afterwards.
Good!
Markus