[Qgis-user] Qgis-user Digest, Vol 90, Issue 71
Leo Kris Palao
lk.palao at gmail.com
Sun Sep 1 19:20:26 PDT 2013
Hi Stefan,
Thanks for taking the time reply. It did work the Sextante > Saga > Grid
Tools > Reclassify Grid Values tool.
Thank you.
-Leo
On Fri, Aug 30, 2013 at 4:21 PM, <qgis-user-request at lists.osgeo.org> wrote:
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> Today's Topics:
>
> 1. Converting null(no data) to 0 (Leo Kris Palao)
> 2. OSX - QGIS not loading Grass plugin (Graeme Merrall)
> 3. How to show images of arster and vector files? (Yoshiaki Tsuzuki)
> 4. Re: Converting null(no data) to 0 (skampus)
> 5. Re: How to show images of arster and vector files?
> (Alexandre Neto)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 30 Aug 2013 13:44:15 +0800
> From: Leo Kris Palao <lk.palao at gmail.com>
> To: QGIS Mailing List <qgis-user at lists.osgeo.org>, a.maunahan at irri.org
> Subject: [Qgis-user] Converting null(no data) to 0
> Message-ID:
> <
> CAMktv+2RizZbED107BKCRY9kq_H+DOx+tZKuS1B+5Ob5m5kgKg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear QGIS Community,
>
> Good Day!
>
> We are currently processing srtm_5 minutes resolution data for asia. We
> have polygons (125 features) that covers 9 raster cells each. Our task is
> to compute the average cell values using the zonal statistics plugin. In
> our data we have negative values and NULL values; we managed to mask those
> negative values using raster calculator -- our syntax is *srtm at 1 > 0) *
> srtm at 1*. But we are having a problem dealing with the NULL values. We
> tried
> the raster > conversion > translate module and set the No Data value to 0.
> It did convert the No Data to 0 values as indicated in the metadata. But
> when we clicked on the pixels the value is -3.40282e+38. My observation
> was, in the polygons where the pixel values are mix of actual elevation
> values and -3.40282e+38, it creates inconsistency in the results. For
> instance, we have a polygon that covers 9 cells -- the 7 cells contains
> elevation values ranging from 4 to 4.59, and the other two cells have
> values -3.40282e+38, the result was: *MEAN = -7.56182992530064e+22* and
> *SUM
> = -6.80564693277058e+22*. If the NULL values have been successfully
> converted to 0 the result should be MEAN = 2.90103 and SUM = 26.10925.
>
> How can I do this properly.
>
> Thank you in advance for any suggestion and help.
>
> Thanks,
> -Leo
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>
> Message: 2
> Date: Fri, 30 Aug 2013 16:04:14 +1000
> From: Graeme Merrall <dasfreak at gmail.com>
> To: qgis-user at lists.osgeo.org
> Subject: [Qgis-user] OSX - QGIS not loading Grass plugin
> Message-ID:
> <CAG5_Ya0yc00m47Pe=VjNYZeRnsLX-f8LR1foZ=
> gdcCLRiykndQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I'm trying to get the Grass plugin to load in QGIS in OSX Mountain Lion.
>
> QGIS ver: 1.8.0 (kyngchaos)
> Grass ver: 6.4 (kyngchaos)
> GDAL ver: 1.10 (kyngchaos with Grass plugin)
> Python: 2.7.2
>
> The error I'm getting is:
> Failed to load
> /Applications/QGIS.app/Contents/MacOS/../PlugIns/qgis/libgrassplugin.so
> (Reason: Cannot load library
> /Applications/QGIS.app/Contents/MacOS/../PlugIns/qgis/libgrassplugin.so:
>
> (dlopen(/Applications/QGIS.app/Contents/MacOS/../PlugIns/qgis/libgrassplugin.so,
> 5): Library not loaded:
> /Applications/GRASS-6.4.app/Contents/MacOS/lib/libgrass_gis.6.4.2.dylib
> Referenced from:
> /Applications/QGIS.app/Contents/PlugIns/qgis/libgrassplugin.so
> Reason: image not found))
>
> Following errors include libgrassprovider and libgrassrasterprovider.
>
> >From from searching about I saw very old references to fftw install
> (tried,
> no joy) and tweaking your LD_LIBRARY_PATH. For LD_LIBRARY_PATH I exported
> both the QGIS plugins dir and Grass lib dir and started QGIS from the
> command line - still didn't work.
>
> Can anyone point out what's going wrong?
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> ------------------------------
>
> Message: 3
> Date: Fri, 30 Aug 2013 07:11:21 +0000
> From: Yoshiaki Tsuzuki <y.tsuzuki at uq.edu.au>
> To: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
> Subject: [Qgis-user] How to show images of arster and vector files?
> Message-ID:
> <F97F5CA2885B5341BCA3735A9FBD9027C02BC2 at uqexmdb8.soe.uq.edu.au>
> Content-Type: text/plain; charset="us-ascii"
>
> Dear QGIS user ML
>
> I am trying to read datasets in the Queensland State, Australia. I could
> open and show image of the DEM file by changing the file properties from
> "no stretch" to "streatch to MinMax", however, I am struggling with other
> raster and vector files. These files can be seen in the TOC, however, no
> image in the map window. I look forward to your help.
>
> (1) Landcover data, raster
> 03/06/2013 12:31 PM 17,020 Metadata_QLD_LANDCOV_2001_25M_X.htm
> 03/06/2013 12:31 PM 22,285 Metadata_QLD_LANDCOV_2001_25M_X.xml
> 03/06/2013 12:30 PM 6,150 QLD_LANDCOV_2001_25M_X.aux
> 03/06/2013 12:30 PM 94 QLD_LANDCOV_2001_25M_X.tfw
> 03/06/2013 12:30 PM 35,406,889 QLD_LANDCOV_2001_25M_X.tif
> 29/08/2013 12:34 PM 6,435 QLD_LANDCOV_2001_25M_X.tif.aux.xml
> 03/06/2013 12:31 PM 17,314 QLD_LANDCOV_2001_25M_X.tif.vat.dbf
>
> (2) Drainage area, vector
> 21/12/2010 05:42 PM 127,924,762 IQ_QLD_DRAINAGE_25K.DAT
> 03/12/2010 01:58 PM 152,186,318 IQ_QLD_DRAINAGE_25K.dbf
> 21/12/2010 05:42 PM 8,822,384 IQ_QLD_DRAINAGE_25K.ID
> 21/12/2010 05:42 PM 337,022,976 IQ_QLD_DRAINAGE_25K.MAP
> 03/12/2010 01:59 PM 145 IQ_QLD_DRAINAGE_25K.prj
> 30/08/2013 04:40 PM 16,369,060 IQ_QLD_DRAINAGE_25K.qix
> 30/08/2013 04:43 PM 1,993 IQ_QLD_DRAINAGE_25K.qml
> 09/12/2010 01:23 PM 18,276,732 IQ_QLD_DRAINAGE_25K.sbn
> 09/12/2010 01:23 PM 193,716 IQ_QLD_DRAINAGE_25K.sbx
> 03/12/2010 01:59 PM 681,175,604 IQ_QLD_DRAINAGE_25K.shp
> 03/12/2010 02:02 PM 17,644,868 IQ_QLD_DRAINAGE_25K.shx
> 21/12/2010 04:32 PM 247 IQ_QLD_DRAINAGE_25K.tab
> 03/12/2010 02:03 PM 27,138 Metadata_IQ_QLD_DRAINAGE_25K.htm
> 03/12/2010 02:03 PM 18,563 Metadata_IQ_QLD_DRAINAGE_25K.xml
>
>
> Kind regards
> Yoshi
>
> Yoshiaki Tsuzuki, Engineering, Architecture and Information Technology
> (EAIT), The University of Queensland, St Lucia, QLD 4072, Australia
> (Office) +61 (0)7 3365 3912: The number has been changed because of the
> moving of office; (Mobile) +61 (0)410 230 355
> E-mail: y.tsuzuki at uq.edu.au<mailto:y.tsuzuki at uq.edu.au>;
> tsuzuki.yoshiaki at gmail.com<mailto:tsuzuki.yoshiaki at gmail.com>
> Homepage: http://sites.google.com/site/yoshiakitsuzuki/Home
>
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> ------------------------------
>
> Message: 4
> Date: Fri, 30 Aug 2013 01:16:50 -0700 (PDT)
> From: skampus <stefano.campus at regione.piemonte.it>
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Converting null(no data) to 0
> Message-ID: <1377850610601-5075169.post at n6.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> you can reclassify null values by means of SEXTANTE
>
> QGIS 1.8 --> Analysis --> Sextante toolbox --> SAGA --> Grid Tools -->
> Reclassify Grid Values
>
> QGIS dev --> Processing --> Toolbox --> Geoalgorithms --> Raster -->
> Edition
> --> Reclassify Grid Values
>
> it is the same function coming from SAGA.
>
> keep the values of all the cells and change only the cell values equal to
> NULL
>
> s.
>
>
>
> --
> View this message in context:
> http://osgeo-org.1560.x6.nabble.com/Converting-null-no-data-to-0-tp5075130p5075169.html
> Sent from the Quantum GIS - User mailing list archive at Nabble.com.
>
>
> ------------------------------
>
> Message: 5
> Date: Fri, 30 Aug 2013 09:21:30 +0100
> From: Alexandre Neto <senhor.neto at gmail.com>
> To: Yoshiaki Tsuzuki <y.tsuzuki at uq.edu.au>
> Cc: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
> Subject: Re: [Qgis-user] How to show images of arster and vector
> files?
> Message-ID:
> <
> CA+H0G_H7M6bRykgz0mYkhh2GAGcvmhbf3mk0tjmT5uZgF28x6g at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> Hello,
>
> Did you try, for each of your layers, do Right-click > Zoom to layer
> extent?
>
> It might be a CRS problem.
>
> Alexandre Neto
>
>
> On Fri, Aug 30, 2013 at 8:11 AM, Yoshiaki Tsuzuki <y.tsuzuki at uq.edu.au
> >wrote:
>
> > Dear QGIS user ML****
> >
> > ** **
> >
> > I am trying to read datasets in the Queensland State, Australia. I could
> > open and show image of the DEM file by changing the file properties from
> > ?no stretch? to ?streatch to MinMax?, however, I am struggling with other
> > raster and vector files. These files can be seen in the TOC, however, no
> > image in the map window. I look forward to your help.****
> >
> > ** **
> >
> > (1) Landcover data, raster****
> >
> > 03/06/2013 12:31 PM 17,020
> Metadata_QLD_LANDCOV_2001_25M_X.htm
> > ****
> >
> > 03/06/2013 12:31 PM 22,285
> Metadata_QLD_LANDCOV_2001_25M_X.xml
> > ****
> >
> > 03/06/2013 12:30 PM 6,150 QLD_LANDCOV_2001_25M_X.aux****
> >
> > 03/06/2013 12:30 PM 94 QLD_LANDCOV_2001_25M_X.tfw****
> >
> > 03/06/2013 12:30 PM 35,406,889 QLD_LANDCOV_2001_25M_X.tif****
> >
> > 29/08/2013 12:34 PM 6,435
> QLD_LANDCOV_2001_25M_X.tif.aux.xml*
> > ***
> >
> > 03/06/2013 12:31 PM 17,314
> QLD_LANDCOV_2001_25M_X.tif.vat.dbf*
> > ***
> >
> > ** **
> >
> > (2) Drainage area, vector****
> >
> > 21/12/2010 05:42 PM 127,924,762 IQ_QLD_DRAINAGE_25K.DAT****
> >
> > 03/12/2010 01:58 PM 152,186,318 IQ_QLD_DRAINAGE_25K.dbf****
> >
> > 21/12/2010 05:42 PM 8,822,384 IQ_QLD_DRAINAGE_25K.ID****
> >
> > 21/12/2010 05:42 PM 337,022,976 IQ_QLD_DRAINAGE_25K.MAP****
> >
> > 03/12/2010 01:59 PM 145 IQ_QLD_DRAINAGE_25K.prj****
> >
> > 30/08/2013 04:40 PM 16,369,060 IQ_QLD_DRAINAGE_25K.qix****
> >
> > 30/08/2013 04:43 PM 1,993 IQ_QLD_DRAINAGE_25K.qml****
> >
> > 09/12/2010 01:23 PM 18,276,732 IQ_QLD_DRAINAGE_25K.sbn****
> >
> > 09/12/2010 01:23 PM 193,716 IQ_QLD_DRAINAGE_25K.sbx****
> >
> > 03/12/2010 01:59 PM 681,175,604 IQ_QLD_DRAINAGE_25K.shp****
> >
> > 03/12/2010 02:02 PM 17,644,868 IQ_QLD_DRAINAGE_25K.shx****
> >
> > 21/12/2010 04:32 PM 247 IQ_QLD_DRAINAGE_25K.tab****
> >
> > 03/12/2010 02:03 PM 27,138
> Metadata_IQ_QLD_DRAINAGE_25K.htm***
> > *
> >
> > 03/12/2010 02:03 PM 18,563
> Metadata_IQ_QLD_DRAINAGE_25K.xml***
> > *
> >
> > ** **
> >
> > ** **
> >
> > Kind regards****
> >
> > Yoshi****
> >
> > ** **
> >
> > Yoshiaki Tsuzuki, Engineering, Architecture and Information Technology
> > (EAIT), The University of Queensland, St Lucia, QLD 4072, Australia****
> >
> > (Office) +61 (0)7 3365 3912: The number has been changed because of the
> > moving of office; (Mobile) +61 (0)410 230 355****
> >
> > E-mail: y.tsuzuki at uq.edu.au; tsuzuki.yoshiaki at gmail.com****
> >
> > Homepage: http://sites.google.com/site/yoshiakitsuzuki/Home****
> >
> > ** **
> >
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >
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