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List: qgis-user
Subject: Re: [Qgis-user] Qgis-user Digest, Vol 83, Issue 55
From: "Philippe Puig" <phlpppgm () gmail ! com>
Date: 2013-01-31 20:48:10
Message-ID: 000d01cdfff4$450f5bf0$cf2e13d0$ () com
[Download RAW message or body]
Hi Regis
I can now use Hotlink to open all sorts of files in QGIS.
Thank you very much for your help.
Philippe
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Today's Topics:
1. Re: map projection in Myanmar (Leo Kris Palao)
2. JPeg compression of tiff-file (Johan Nilsson)
3. Re: Hotlink field definition (R?gis Haubourg)
4. Re: Installing plugins offline (Siki Zoltan)
5. Re: JPeg compression of tiff-file (Andreas Neumann)
6. Split polygon using area and DEM (Wesley Roberts)
7. Re: out-db postgis raster issue (AndyT)
8. Re: JPeg compression of tiff-file (Andreas Neumann)
----------------------------------------------------------------------
Message: 1
Date: Wed, 30 Jan 2013 16:13:49 +0800
From: Leo Kris Palao <lk.palao@gmail.com>
To: Wirote Laongmanee <wirotela@gmail.com>
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] map projection in Myanmar
Message-ID:
<CAMktv+3KLwTh0eKiQnB03=MGnXHf6qwsExe6bx+gMqZry0CuPw@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Dear Wirote,
Thank you very much. It will surely help.
-Leo
On Mon, Jan 28, 2013 at 6:38 PM, Wirote Laongmanee
<wirotela@gmail.com>wrote:
> Dear Leo,
>
> In Thailand, we are using UTM Zone 47N for majority part and 48N at
> east part of Thailand. And also we are using WGS84-Latlon together, we
> also remain Indian Datum 1975 data but need to consider when work
together.
>
> In Myanmar I am not sure there are specific projection or not but when
> we handle their data we selected WGS84/UTM Zone 46 N, it work well.
> May help you.
>
> Wirote
>
>
> On Mon, Jan 28, 2013 at 5:27 PM, Leo Kris Palao <lk.palao@gmail.com>wrote:
>
>> Good Day QGIS Users,
>>
>> Would like to ask what map projection is suitable for Myanmar? Is it
>> okay to use UTM coordinate system or can you recommend other coordinate
system?
>> Thank you.
>>
>> -Leo
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>>
>
>
> --
> Wirote Laongmanee
> http://wmap.wordpress.com
> http://parn-site.blogspot.com
>
>
--
*******************************************************
*LEO KRIS M. PALAO*
Researcher
World Agroforestry Centre (International Centre for Research in
Agroforestry)
Mobile #: +63(916)7698-367
E-mail: L.Palao@irri.org or lk.palao@gmail.com
*Transforming Lives and Landscapes
*
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Message: 2
Date: Wed, 30 Jan 2013 09:50:50 +0100
From: Johan Nilsson <joni8135@gmail.com>
To: qgis-user <qgis-user@lists.osgeo.org>
Subject: [Qgis-user] JPeg compression of tiff-file
Message-ID:
<CALnM-k8kUfBbt1=D20WMvLx3CL0_5_vFUUEXPTqLKoS=Jh+68Q@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi.
Maybe little of topic but...
I have found a ortofoto as a Geotiff-file that are compressed with jpeg.
Why kompress tiff with jpeg and not make the hole file as jpg?
Cheers
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Message: 3
Date: Wed, 30 Jan 2013 00:56:22 -0800 (PST)
From: R?gis Haubourg <regis.haubourg@eau-adour-garonne.fr>
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Hotlink field definition
Message-ID: <1359536182268-5030861.post@n6.nabble.com>
Content-Type: text/plain; charset=UTF-8
Hi Philippe,
you just have to define native actions on layers as described in manual or
here.
This is located in layer properties/ tab "actions".
Since 1.8, you can add examples to help you define different actions. If you
alreadyu have a url or a field path in a field, just use "open" action, and
insert the name of your field with the tool that inserts an expression. It
should be something like [%myfield%] R?gis
--
View this message in context:
http://osgeo-org.1560.n6.nabble.com/Hotlink-field-definition-tp5030749p50308
61.html
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------------------------------
Message: 4
Date: Wed, 30 Jan 2013 10:05:40 +0100 (CET)
From: Siki Zoltan <siki@agt.bme.hu>
To: Claire McIntyre <cmcintyre44@hotmail.com>
Cc: "qgis-user@lists.osgeo.org" <qgis-user@lists.osgeo.org>
Subject: Re: [Qgis-user] Installing plugins offline
Message-ID: <Pine.LNX.4.64.1301300959430.13435@bme-geod>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Dear Claire,
did you copy plugin into your personal plugin directory?
>From the "\" in the path I suppose you use Windows, then you should
>copy
the plugin into a subdirectory of
\Documents and Settings\<user name>\.qgis\python\plugin
Regards,
Zoltan
On Wed, 30 Jan 2013, Claire McIntyre wrote:
> Hello,
>
> I need to install plugins offline. I have read in posts to download
> from web & unzip to qgis\python\plugins
>
> I have done this and the plugins are visible when I go to Manage Plugins.
>
> When I check the plugin to enable it I get an error. I suspect the file
are in the correct place but not registered/installed correctly.
>
> Other posts are saying QGIS must be connected to the internet, there is no
way round..
>
> I am using QGIS 1.8 on windows.
>
> Anyone know how I can get this working?
>
> Thanks,
> Claire
>
> Sent from mobile device
> _______________________________________________
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
------------------------------
Message: 5
Date: Wed, 30 Jan 2013 10:10:35 +0100
From: Andreas Neumann <a.neumann@carto.net>
To: Johan Nilsson <joni8135@gmail.com>,qgis-user
<qgis-user@lists.osgeo.org>
Subject: Re: [Qgis-user] JPeg compression of tiff-file
Message-ID: <467cbf80-0a7b-4fa9-b0d2-001a613cb222@email.android.com>
Content-Type: text/plain; charset="utf-8"
Hi,
Geotiff files can have tiles and overviews and georeference information
whereas jpeg files cannot to my knowledge. Georeference information for jpeg
files are stored in separate jpw files. Besides, due to tiling and overviews
tif files can be very large. You could store all orthoimages of your region
in a single file without performance problems.
Personally I use JPEG compressed tif files for all of my orthoimages. I
don't like ECW or MrSid due to the unclear license issues. If you look into
the archives of this list you see that people have troubles with these
closed formats.
Andreas
Johan Nilsson <joni8135@gmail.com> schrieb:
>Hi.
>Maybe little of topic but...
>I have found a ortofoto as a Geotiff-file that are compressed with
>jpeg.
>Why kompress tiff with jpeg and not make the hole file as jpg?
>
>Cheers
>
>
>-----------------------------------------------------------------------
>-
>
>_______________________________________________
>Qgis-user mailing list
>Qgis-user@lists.osgeo.org
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Message: 6
Date: Wed, 30 Jan 2013 11:12:28 +0200
From: Wesley Roberts <jwesroberts@gmail.com>
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Split polygon using area and DEM
Message-ID:
<CAFik=FfjCWsK0k+oUdLxspRkEVci_=rHapv7nuYDBegCVx8Zmg@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Dear Colleagues,
I am tasked with defining harvesting strips for a community forest in Zambia
and am struggling to find a suitable solution. Our approach uses the coop
and shelter belt (harvest alternative strips of forest) method and requires
that our area be split into 5 ha "blocks". I understand how to make a grid
of 5 ha blocks, however, we have a topography issue. Our site is located in
some pretty hilly areas so we want to harvest along contours to avoid soil
erosion issues. I am looking for a quantitative approach to portioning our
site up into 5ha blocks that run along contours. I have access to QGIS and R
as well as any other FOSS available. Do any of the Qgis users have a
suggestion with regards to a suitable approach?
Many thanks,
Wesley
--
Dr Wesley Roberts
jwesroberts@gmail.com
Cell: +27(0)83 5355 646
skype: roberts-w
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Message: 7
Date: Wed, 30 Jan 2013 01:17:11 -0800 (PST)
From: AndyT <andy@centremaps.co.uk>
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] out-db postgis raster issue
Message-ID: <1359537431498-5030866.post@n6.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi,
Just wondering if anyone had any thoughts on my issue loading out-db /
filesystem stored rasters from PostGIS.
I began to wonder if the data had loaded correctly but came across the
following psql method to get a basic image out and it is fine:
postgis20test=# SELECT oid, lowrite(lo_open(oid, 131072),png) AS num_bytes
FROM ( VALUES (lo_create(0), ST_AsPNG((SELECT rast FROM
public.raster2pgsqltest_local _outdb WHERE rid=1)) )) AS v(oid,png);
oid | num_bytes
-------+-----------
19094 | 8769
(1 row)
postgis20test=# \lo_export 19094 `C:/test.png`
However, i note a PostGIS raster option ST_AsGDALRaster and i tried
replacing the ST_AsPNG clause with this (which runs as a SELECT query) and
it doesn't seem to work.
ST_asgdalraster((SELECT rast FROM public.raster2pgsqltest_local_outdb WHERE
rid=1),'png',NULL,27700)
Any ideas on what i can do to further narrow down my search for the issue
would be fantastic? Or even if i'm asking in the wrong place... i have also
popped something on the gdal site.
Andy
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------------------------------
Message: 8
Date: Wed, 30 Jan 2013 13:20:27 +0100
From: Andreas Neumann <a.neumann@carto.net>
To: qgis-user <qgis-user@lists.osgeo.org>
Subject: Re: [Qgis-user] JPeg compression of tiff-file
Message-ID: <83f9f230538a09c5c818d36a01e3073b@carto.net>
Content-Type: text/plain; charset=UTF-8; format=flowed
Hi Johan,
There may be two reasons why the opening of the tiff files take so
long:
1. They do not have internal pyramids.
2. Your QGIS version is calculating histograms
You can see if your raster files have pyramids by checking the pyramids
tab in the raster layer properties. If they do not have the pyramids you
will see red cross-marks. You can build or rebuild the pyramids directly
from this tab. Depending on the file-size the process of pyramid building
takes a long time.
As to two: some QGIS versions out there (don't ask me which version
exactly) always calculated histograms on opening the file. If you have
such a version, you should upgrade your QGIS.
If neither of the above are the case the file should open in less than a
second, regardless of the file size.
The recommended compression inside the tiff-file depends on the nature of
the data:
Pure black and white files or files with a handful of colors should not be
jpeg-compressed. A better compression would be deflate or ccittrle or rle.
These are all lossless compressions. JPEG is a lossy compression.
For photo-data or maps with a lot of colors, also for grayscale photos,
JPEG is the better option. You can also set the quality. Be aware though
that JPEG can destroy bits of the data (depending on the quality
setting) - so keep your original data as well.
See http://www.gdal.org/frmt_gtiff.html for more information.
Hope this helps.
Andreas
On Wed, 30 Jan 2013 10:40:45 +0100, Johan Nilsson wrote:
> Thanks.
> Little as I suspected, but even more and that are maybe a way for me
> to find a solution... I have a lot of pure tiff files as black and
> white ortophoto from different years, but when I open the project?in
> Qgis?is take a long time to 'read in' them. Is there a solution to
> save ortophoto (tiff files) and just load them that are of interest?
> I
> have just add them as raster in a project in Qgis. There tiff-files
> have namne korrensponding to a grid number.
>
> 2013/1/30 Andreas Neumann
>
>> Hi,
>>
>> Geotiff files can have tiles and overviews and georeference
>> information whereas jpeg files cannot to my knowledge. Georeference
>> information for jpeg files are stored in separate jpw files.
>> Besides, due to tiling and overviews tif files can be very large.
>> You could store all orthoimages of your region in a single file
>> without performance problems.
>>
>> Personally I use JPEG compressed tif files for all of my orthoimages.
>> I don't like ECW or MrSid due to the unclear license issues. If you
>> look into the archives of this list you see that people have troubles
>> with these closed formats.
>>
>> Andreas
>>
>> Johan Nilsson schrieb:
>>
>>> Hi.
>>> Maybe little of topic but...
>>> I have found a ortofoto as a Geotiff-file that are compressed with
>>> jpeg. Why kompress tiff?with jpeg and not make the hole file as jpg?
>>> ?
>>> Cheers
>>>
>>> -------------------------
>>>
>>> Qgis-user mailing list
>>> Qgis-user@lists.osgeo.org [1]
>>> http://lists.osgeo.org/mailman/listinfo/qgis-user [2]
>>
>> --
>> Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail
>> gesendet.
>
>
>
> Links:
> ------
> [1] mailto:Qgis-user@lists.osgeo.org
> [2] http://lists.osgeo.org/mailman/listinfo/qgis-user
> [3] mailto:joni8135@gmail.com
> [4] mailto:a.neumann@carto.net
--
--
Andreas Neumann
B?schacherstrasse 10A
8624 Gr?t (Gossau ZH)
Switzerland
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