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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks David, I will explore using the bands to store multiple rasters later. For now I am just trying to see how I can visualise one raster (stored in one
row of a multi-raster i.e. multiple row, table). I assume I will have the same problem with a multiband raster i.e. selecting only one band to visualise in QGIS. As I need to perform calculations using either individual rows or bands, I need to resolve this.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I am convinced this is simple but the brain cells are not working well today.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Darrel<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> postgis-users-bounces@lists.osgeo.org [mailto:postgis-users-bounces@lists.osgeo.org]
<b>On Behalf Of </b>David Haynes<br>
<b>Sent:</b> 01 August 2014 13:51<br>
<b>To:</b> PostGIS Users Discussion<br>
<b>Subject:</b> Re: [postgis-users] Sorry for simple question!<o:p></o:p></span></p>
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<p class="MsoNormal">You can place rasters into a single raster using ST_BAND. If you are familiar with rasters this will make a multispectral raster. I don't believe there is a limit to the bands as I have added over 50. To make the multispectral raster your
other rasters (matrices) will need to be the same cell size and alignment. <o:p></o:p></p>
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<p class="MsoNormal">You might try <a href="http://www.gdal.org/gdal_merge.html">http://www.gdal.org/gdal_merge.html</a> (using the -separate) <o:p></o:p></p>
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<p class="MsoNormal">This will create a 2 banded raster in postgis<o:p></o:p></p>
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<p class="MsoNormal">ST_AddBand(ST_MakeEmptyraster(layers.modis_rast),ARRAY[layers.modis_rast, layers.stack_rast]) as rast<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Aug 1, 2014 at 6:42 AM, Darrel Maddy <<a href="mailto:darrel.maddy@newcastle.ac.uk" target="_blank">darrel.maddy@newcastle.ac.uk</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Dear all,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am just reacquainting myself with postgres and postgis and trying to decide how best to store the output from my model (large matrices stored in gtiff format). I really want
to store multiple rasters in one table but when I try to visualise these in QGIS (via an sql extract in dbmanager using import to new layer) nothing happens. I can add one raster per table to the canvas but I do not want thousands of tables. Will the dbmanager
sql add layer work with rast as a geometry?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I suspect this is simple, but it eludes me at present.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks in anticipation of your help.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#888888"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#888888">Darrel<o:p></o:p></span></p>
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