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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Hi Larry,<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'>it’s difficult to tell what went wrong without knowing the steps and the data you used. I just tried all the slope algorithms in the toolbox (gdal:slope, qgis:slope) and all work nicely here. I use QGIS 3 from the OSGeo4W-Installation … used a projected (in meters) SRTM scene and had no troubles running the slope algorithms.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'>Frank<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Dipl. Geogr. Frank Broniewski<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Waldhölzbacher Str. 51<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>66679 Losheim am See<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>06872 509 068 4<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>0176 611 26 9 2 6<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><a href="http://www.frankbroniewski.com"><span style='color:#0563C1'>www.frankbroniewski.com</span></a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b>Von:</b> Qgis-user <qgis-user-bounces@lists.osgeo.org> <b>Im Auftrag von </b>larry mason<br><b>Gesendet:</b> Montag, 9. Juli 2018 19:29<br><b>An:</b> qgis-user@lists.osgeo.org<br><b>Betreff:</b> [Qgis-user] Python error when trying to do a slope analysis in a DEM raster file<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><img border=0 id="_x0000_i1025" src="https://mailtrack.io/trace/mail/4790cfbaf39d64c696d840259962559ef60d0b91.png?u=651070"><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.5pt;font-family:"Helvetica",sans-serif;color:#202124'>I know I should read the documentation just not sure where to find it. I'm trying to do a slope analysis of a DEM raster layer... I get the following python stack trace:</span><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>snip---------------<o:p></o:p></p></div><div><p style='margin:0cm;margin-bottom:.0001pt;white-space:pre-wrap'><b><span style='color:red'>An error has occurred while executing Python code:</span></b> <o:p></o:p></p><p style='mso-margin-top-alt:10.5pt;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm;white-space:pre-wrap'><b><span style='font-size:18.0pt'>AttributeError: 'slope' object has no attribute 'preprocessParameters' </span></b><o:p></o:p></p><pre style='mso-margin-top-alt:9.0pt;margin-right:0cm;margin-bottom:9.0pt;margin-left:0cm'>Traceback (most recent call last):<br> File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\gui\menus.py", line 181, in <br> action.triggered.connect(lambda: _executeAlgorithm(alg))<br> File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\gui\menus.py", line 227, in _executeAlgorithm<br> dlg = alg.createCustomParametersWidget(None)<br> File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\gdal\GdalAlgorithm.py", line 62, in createCustomParametersWidget<br> return GdalAlgorithmDialog(self)<br> File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\gdal\GdalAlgorithmDialog.py", line 58, in __init__<br> self.mainWidget().parametersHaveChanged()<br> File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\gdal\GdalAlgorithmDialog.py", line 110, in parametersHaveChanged<br> parameters = self.parent.getParameterValues()<br> File "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\gui\AlgorithmDialog.py", line 119, in getParameterValues<br> return self.algorithm().preprocessParameters(parameters)<br>AttributeError: 'slope' object has no attribute 'preprocessParameters'<o:p></o:p></pre><p style='margin:0cm;margin-bottom:.0001pt;white-space:pre-wrap'><br><b>Python version:</b> 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] <br><b>QGIS version:</b> 3.0.0-Girona Girona, 001c80b0c3 <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>end snip-----------------------<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>So I'm wondering if I need to set anything up for QGIS is use python modules. Or where one sets up preprocessing Parameters. Any good tutorials on loading DEMs. configuring properties, and running analysis. Thanks,<o:p></o:p></p></div><div><p class=MsoNormal>Larry<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='user-select: none'><tr><td style='padding:6.0pt 6.0pt 6.0pt 6.0pt'><p class=MsoNormal><a href="https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality6&"><span style='text-decoration:none'><img border=0 width=32 height=32 style='width:.3333in;height:.3333in' id="_x0000_i1026" src="https://s3.amazonaws.com/mailtrack-signature/sender_notified.gif" alt=Mailtrack></span></a><o:p></o:p></p></td><td style='padding:6.0pt 6.0pt 6.0pt 6.0pt'><p class=MsoNormal><span style='color:#777777'>Sender notified by</span> <br><a href="https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality6&"><span style='color:#4374F7'>Mailtrack</span></a> <span style='font-size:1.0pt'>07/09/18, 12:25:29 PM</span> <o:p></o:p></p></td><td style='padding:6.0pt 6.0pt 6.0pt 6.0pt'></td></tr></table><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></body></html>