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</div><div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Dear gdal
users</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">I hope you
can help me with a question that is puzzling me, since a couple of days. So let
me explain my problem.</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span><span style="mso-ansi-language:EN-US" lang="EN-US">2 years ago,
I downloaded a SRTM 90m .asc file into GRASS GIS. </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">A week ago, I
decided to generate some contours lines using gdal_contour command (version FWTools2.4.7)
and compare the contours lines with contours already produced in GRASS GIS. I was quite
disturbed when in fact, I found a horizontal shift of the contours lines to the
south of about -/+35m or to north (unknown distance), with respect to the grass gis- generated contours<br></span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Technical aspect of my hardware<br></span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">I am<span style="mso-spacerun:yes"> </span>in Grass GIS <span style="mso-spacerun:yes"> </span>MS Windows environment (native using MinGW)
combined with QGIS for visualisation purposes</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Using FWtools
2.4.7</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">So, here are
the steps I followed</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Part I</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-tab-count:1"> </span>-Produced 90m contours lines in GRASS
GIS out of the SRTM DEM 90 by using the r.contour command</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-tab-count:1"></span>-Visualised the contours lines in QGIS
and saved them as shp format</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Part II</span></div>
<div class="MsoListParagraphCxSpFirst" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="" lang="EN-US">-</span><span style="mso-ansi-language:EN-US" lang="EN-US">Export SRTM 90 rasterfile as <span style="mso-spacerun:yes"> </span>an ESRI ASCII GRID fomat and converted it to .tif
format using FWTools2.4.7</span></div>
<div class="MsoListParagraphCxSpLast" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-spacerun:yes"> </span>Using gdal_contours utility I generated 90
meters contour lines</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-tab-count:1"> </span>Results 1<br></span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Comparison
between the GRASS-generated and the GDAL- generated contours lines exhibited a horizontal
shift of -/+ 35m to the south in relation to GRASS GIS generated contours</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US"> </span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">Part III</span></div>
<div class="MsoListParagraphCxSpFirst" style="text-indent: -18pt;"><span style="mso-ansi-language:EN-US" lang="EN-US"><span style="mso-list:Ignore">1<span style="font:7.0pt "Times New Roman""></span></span></span><span style="" lang="EN-US">--Export the raster file SRTM90m from
GRASS GIS; as a Geotiff using gdal</span><span style="" lang="EN-US"><br></span></div><div class="MsoListParagraphCxSpFirst" style="text-indent: -18pt;"><span style="mso-ansi-language:EN-US" lang="EN-US">-Generate 90m contours using gdal</span></div><div class="MsoListParagraphCxSpFirst" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><span style="mso-ansi-language:EN-US" lang="EN-US"><br></span></div>
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<div class="MsoListParagraphCxSpMiddle"><span style="mso-ansi-language:
EN-US" lang="EN-US"> </span></div>
<div class="MsoListParagraphCxSpMiddle"><span style="mso-ansi-language:
EN-US" lang="EN-US">Result 2 </span></div>
<div class="MsoListParagraphCxSpMiddle"><span style="mso-ansi-language:
EN-US" lang="EN-US"> </span></div>
<div class="MsoListParagraphCxSpLast"><span style="" lang="EN-US">Comparing the GRASS GIS contours with the geotiff- generated contours a
displacement to the north was observed, no distance measured.</span></div><div class="MsoListParagraphCxSpLast"><br><span style="" lang="EN-US"></span></div><div class="MsoListParagraphCxSpLast">I hope you can give some hints..</div><div class="MsoListParagraphCxSpLast">best regards <br></div><div class="MsoListParagraphCxSpLast">Rengifo<br><span style="" lang="EN-US"></span></div><div class="MsoListParagraphCxSpLast"><span style="mso-ansi-language:
EN-US" lang="EN-US"><br></span></div>
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