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List: qgis-user
Subject: Re: [Qgis-user] calculate areas of polygons imported from a dxf file
From: Jose Sanchez via QGIS-User <qgis-user () lists ! osgeo ! org>
Date: 2024-03-23 22:13:30
Message-ID: F28E67C6-D004-4BA2-B127-BEE6FF3FE4DB () hxcore ! ol
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--></style></head><body lang=ES-MX link=blue vlink="#954F72" \
style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Thank you \
very much Zoltan!,</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Now \
it is working.</p><p class=MsoNormal><o:p> </o:p></p><p \
class=MsoNormal>Thanks,</p><p class=MsoNormal><o:p> </o:p></p><p \
class=MsoNormal>Jose</p><p class=MsoNormal><o:p> </o:p></p><p \
class=MsoNormal>Sent from <a \
href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows</p><p \
class=MsoNormal><o:p> </o:p></p><div \
style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 \
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal \
style='border:none;padding:0cm'><b>From: </b><a \
href="mailto:siki1958@gmail.com">Zoltán Siki</a><br><b>Sent: </b>sábado, 23 de \
marzo de 2024 02:59 p. m.<br><b>To: </b><a \
href="mailto:jsanchezo.cam@gmail.com">jsanchezo.cam@gmail.com</a><br><b>Cc: </b><a \
href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br><b>Subject: \
</b>Re: [Qgis-user] calculate areas of polygons imported from a dxf file</p></div><p \
class=MsoNormal><o:p> </o:p></p><div><div><div><p class=MsoNormal>Dear \
Jose,</p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p \
class=MsoNormal>I think you imported a line layer from the DXF file which has no \
area.</p></div><div><p class=MsoNormal>Convert the line layer to polygon one using \
Vector/Geometry tools/Lines to Polygons from the menu.</p></div><div><p \
class=MsoNormal><o:p> </o:p></p></div><div><p \
class=MsoNormal>Regards,</p></div><div><p class=MsoNormal>Zoltan</p></div><p \
class=MsoNormal><o:p> </o:p></p></div><p \
class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Jose Sanchez via \
QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>> \
ezt írta (időpont: 2024. márc. 23., Szo, 19:30):</p></div><blockquote \
style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm \
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><div><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi,</p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I added a \
vector layer to QGIS 3.36.0 by importing a dxf file (it contains two polygons). I \
want to calculate the differentce in área of the polygons (considering the \
topography of a DEM file visualized in hillshade). So, I opened the attribute table, \
created a calculated field (ANRio) with the $area expression, but I get a NULL \
value. I see that my attribute table has NULL values for Paper Space and Line Type (I \
do not know if that might be the problem). I am probably not importing the polygons \
properly. I also tried importing as shape file using "anotherDXFimport" plugin but \
still I get NULL values in the area calculated field.</p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I would \
appreciate your help.</p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks,</p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Jose</p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Imported \
polygons</p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><img border=0 width=624 \
height=351 style='width:6.5in;height:3.6562in' \
id="m_5426854801401005769_x005f_x0000_i1026" src="cid:ii_18e6ca82131b18185b01" \
alt="Mapa Descripción generada automáticamente"></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Attribute \
tables</p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><img border=0 width=624 \
height=351 style='width:6.5in;height:3.6562in' \
id="m_5426854801401005769Imagen_x0020_1" src="cid:ii_18e6ca821327263f6282" \
alt="Interfaz de usuario gráfica, Aplicación Descripción \
generada automáticamente"></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Sent from \
<a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows</p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> </p></div></div><p \
class=MsoNormal>_______________________________________________<br>QGIS-User mailing \
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class=MsoNormal><br clear=all></p><p \
class=MsoNormal><o:p> </o:p></p></div></body></html>
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