)
Cc: 'Brian Case'; 'gdal-dev@lists.osgeo.org'
Subject: Re: [gdal-dev] Fast Pixel Access
Le samedi 01 février 2014 15:04:46, David Baker (Geoscience) a écrit :
Evan,
I am not sure how to profile as I do not have access to the code to
profile. I did do a timing test...
vrt file = 22,970 KB
, 2014 6:36 AM
To: David Baker (Geoscience)
Cc: 'Brian Case'; 'gdal-dev@lists.osgeo.org'
Subject: Re: [gdal-dev] Fast Pixel Access
Le samedi 01 février 2014 15:04:46, David Baker (Geoscience) a écrit :
Evan,
I am not sure how to profile as I do not have access to the code to
profile. I
: [gdal-dev] Fast Pixel Access
Selon David Baker (Geoscience) david.m.ba...@chk.com:
Even,
No not an i386... A Dell Precision T3500 w/Intel W3680 @ 3.33GHhz 6x2 cores
with 12.0GB. Thought the data is on the network, not local, with 1Gbps
access. The GDAL_DISABLE_READDIR_ON_OPEN = TRUE did
a usefull stack trace.
David
-Original Message-
From: Even Rouault [mailto:even.roua...@mines-paris.org]
Sent: Monday, February 10, 2014 8:54 AM
To: David Baker (Geoscience)
Cc: 'Even Rouault'; 'Brian Case'; 'gdal-dev@lists.osgeo.org'
Subject: RE: [gdal-dev] Fast Pixel Access
Selon
be okay.
David
From: gdal-dev-boun...@lists.osgeo.org
[mailto:gdal-dev-boun...@lists.osgeo.org] On Behalf Of Luke Roth
Sent: Monday, February 03, 2014 8:11 AM
To: Jukka Rahkonen
Cc: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel Access
Another thing that might speed up access
David Baker (Geoscience david.m.baker at chk.com writes:
Jukka,
No matter the endpoint the user uses to access the data, behind the
scenes, there must be fast pixel access,
correct? Or are you saying that at WFS would do it quickly out of the box?
Hi,
Fast access to data, yes, but using
Another thing that might speed up access is setting the config option
GDAL_DISABLE_READDIR_ON_OPEN
= TRUE, either as an environment variable or on the command line. That
should help with GDAL reading the directory each time it opens a dataset.
I have an application which reads one value from
: gdal-dev-boun...@lists.osgeo.org
[mailto:gdal-dev-boun...@lists.osgeo.org] On Behalf Of Daniel Clewley
Sent: Saturday, February 01, 2014 1:45 PM
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel Access
Hi David,
Following on from the VRT / Bigtiff comparison Jukka posted. Have you
Luke Roth roth.luke at gmail.com writes:
Another thing that might speed up access is setting the config
option GDAL_DISABLE_READDIR_ON_OPEN = TRUE, either as an environment
variable or on the command line. That should help with GDAL reading the
directory each time it opens a dataset. I have
-Jukka
tileindex, mapserver, and the gdal wms driver
On Mon, 2014-02-03 at 17:20 +, Jukka Rahkonen wrote:
Luke Roth roth.luke at gmail.com writes:
Another thing that might speed up access is setting the config
option GDAL_DISABLE_READDIR_ON_OPEN = TRUE, either as an environment
Hi,
Perhaps, but in this game the rule was not to have any GIS servers. Myself I
would rather consider WFS. It could send heights from single points but also a
profile along a line or all values within a polygon.
-Jukka-
Brian Case [r...@winkey.org] wrote:
-Jukka
tileindex, mapserver, and
...@lists.osgeo.org] On Behalf Of Rahkonen Jukka (Tike)
Sent: Monday, February 03, 2014 11:37 AM
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel Access
Hi,
Perhaps, but in this game the rule was not to have any GIS servers. Myself I
would rather consider WFS. It could send heights from
-Original Message-
From: gdal-dev-boun...@lists.osgeo.org [mailto:
gdal-dev-boun...@lists.osgeo.org] On Behalf Of Rahkonen Jukka (Tike)
Sent: Monday, February 03, 2014 11:37 AM
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel Access
Hi,
Perhaps, but in this game the rule
Hi,
I made a few tests and here comes my conclusions. Hypothesis is that someone
wants to make a DEM query service which is using gdallocationinfo for
queries and DEM data is to be accessed as files from a standard web site. I
compared three alternatives:
1) There are thousands of DEM files on
David Baker (Geoscience david.m.baker at chk.com writes:
Dev’s,
I have a set of 55,501 bil files in a single directory. They are DEMS
data that cover the US in 7.5 minute tiles. I would like to randomly access
elevations at a given lat/lon’s from the whole dataset. I created a vrt
window. Does this give any insight?
David
-Original Message-
From: gdal-dev-boun...@lists.osgeo.org
[mailto:gdal-dev-boun...@lists.osgeo.org] On Behalf Of Even Rouault
Sent: Saturday, February 01, 2014 1:28 AM
To: Brian Case
Cc: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel
Of Jukka Rahkonen
Sent: Saturday, February 01, 2014 7:09 AM
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel Access
David Baker (Geoscience david.m.baker at chk.com writes:
Dev’s,
I have a set of 55,501 bil files in a single directory. They are DEMS
data that cover the US
Of Jukka Rahkonen
Sent: Saturday, February 01, 2014 7:09 AM
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] Fast Pixel Access
David Baker (Geoscience david.m.baker at chk.com writes:
Dev’s,
I have a set of 55,501 bil files in a single directory. They are DEMS
data that cover
...@cape.com]
Sent: Saturday, February 01, 2014 8:23 AM
To: David Baker (Geoscience)
Cc: gdal-dev
Subject: Re: [gdal-dev] Fast Pixel Access
This is an application that is just screaming for a spatial index
For starters you could build a spatialite db of the individual file extents
that returned
David Baker (Geoscience david.m.baker at chk.com writes:
Jukka,
Jukka wrote:
I was experimenting with something like a GIS service without a GIS server)
and I have some examples online but...
I am looking to do as you have, a RESTful service to query the elevation
at a given location.
Now what to do instead? A WMS/WCS service can send a piece of DEM with
thousands of pixels as GeoTIFF in a second and a heavy client like QGIS
could continue the analysis. Or you can use the existing vrt file and read
the region of interest with gdal_translate. This request is not very fast
(Geoscience) david.m.ba...@chk.com
To: 'gdal-dev@lists.osgeo.org' gdal-dev@lists.osgeo.org
Subject: [gdal-dev] Fast Pixel Access
Message-ID:
2a18a4344312134b937df938d992264a0508f...@okcexhprd122.chkenergy.net
Content-Type: text/plain; charset=us-ascii
Dev's,
I have a set of 55,501 bil files
Dev's,
I have a set of 55,501 bil files in a single directory. They are DEMS data
that cover the US in 7.5 minute tiles. I would like to randomly access
elevations at a given lat/lon's from the whole dataset. I created a vrt file
from the directory of bil files, and have been able to access
Le vendredi 31 janvier 2014 17:15:53, David Baker (Geoscience) a écrit :
Dev's,
I have a set of 55,501 bil files in a single directory. They are DEMS data
that cover the US in 7.5 minute tiles. I would like to randomly access
elevations at a given lat/lon's from the whole dataset. I
evenr
what about the use of a tileindex? seems an intersection with a set of
polys first would be quick
brian
On Fri, 2014-01-31 at 19:30 +0100, Even Rouault wrote:
Le vendredi 31 janvier 2014 17:15:53, David Baker (Geoscience) a écrit :
Dev's,
I have a set of 55,501 bil files in a
Le samedi 01 février 2014 00:23:13, Brian Case a écrit :
evenr
what about the use of a tileindex?
You really mean a tileindex as produced by gdaltindex ? Well, that's not
exactly the same beast as a VRT, but yes if it was recognized as a GDAL
dataset then you could potentially save the
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