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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Let us introduce ourselves, we are a GIS team of the
Cartographic division of INDEC (the national census buro of <st1:place w:st="on"><st1:country-region
w:st="on">Argentina</st1:country-region></st1:place>), we are working on the
next national Agricultural Census 2018, which will be carried out on Tablets
with Android O.S., running Leaflet to show the maps.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>We have strong storage restrictions (SD 16 GB memory)
and the hole program (images included) has to <b><span style='font-weight:bold'>run
local on the tablet</span></b> (no internet signal in the most areas to be
covered)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>We get an province wide 30mts. LANDSAT mosaic,
resampled at 15mts with the monocromatic band (each pair: census tacker/tablet)
are restricted to only one province.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>But for some zones (intensive agricultural use) we
need SPOT 2,5 mts images.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>We get to generate the tiled pyramid of the 15mts
landsat, using GDAL gdal2tile<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>gdal2tiles.py -t "BS AS" -c INDEC -z 0-8 -e
-d -a 0 -p raster -v -s EPSG:22185 -r cubic /BsAsGK5.tif /tiles_bs_as<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>After that we convert the png files to jpg, using :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>find tiles_bsas -iname '<em><i><font
face="Times New Roman">.png' | while read i; do mogrify -format jpg
"$i" && rm "$i"; echo "Converted $i to ${i%.</font></i></em>}.jpg";
done</span></font><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Here is our question: How should we generate the
tiled pyramids of the 2,5 mts SPOT images in a way that both images use the
same grid without 'resampling' the whole landsat to 2,5mts, of course, </span></font><font
size=2 face="Courier New"><span lang=EN-US style='font-size:10.0pt;font-family:
"Courier New"'>hoping to make one web tile tree that goes down to <st1:metricconverter
ProductID="2.5 meters" w:st="on">2.5 meters</st1:metricconverter> in some
places, but only down to 15meters in other places. (as Frank Warmerdam clearly
put out)</span></font><font size=2 face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>If you are willing to give us some advice, we will
send you the link`s to some sample images.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Link to LANDSAT 15mts. example (prov of BsAs) 6.5GB<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'>Link to SPOT 2,5mts. example (Department of San
Pedro) 2.3Gb<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank`s in advance<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>JC<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=gray face="Times New Roman"><span
style='font-size:10.0pt;color:gray'>---------------------------------------------------------------------</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=gray face="Times New Roman"><span
style='font-size:10.0pt;color:gray'>Arqto. - Mgster. Juan Carlos Fuchs<br>
Sistema de Información Geográfica</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=gray face="Times New Roman"><span
style='font-size:10.0pt;color:gray'>Instructor y Soporte de Firma Digital<br>
Instituto Nacional de Estadística y Censos - INDEC<br>
Av. Julio A. Roca 609, 8° piso, of. 807/808 - CABA (1067)<br>
Tel.: 54 11 4349-9704 - 4349-9702/03/05/06/08/00</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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