<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div><br></div><div>Any csv with a wkt field will behave just like any shape file. Since we can’t add a new field to a csv as it’s in read only mode, you have to export it to an editable format like a virtual layer, dbf, or SpatiaLite and then create the geometries.<br><br><div dir="ltr">Nicolas Cadieux</div><div dir="ltr"><br><blockquote type="cite">Le 13 nov. 2020 à 09:24, Andreas Neumann <a.neumann@carto.net> a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Hi Nicolas,<br>
</p>
<p>Yes - but that doesn't magically turn a "non geometry" table into
a "geometry table" - as far as I know. So you probably need to
create a "Virtual Layer" and create the geometry similar to what
you propose.<br>
</p>
<p>Andreas<br>
</p>
<div class="moz-cite-prefix">Am 13.11.20 um 15:22 schrieb Nicolas
Cadieux:<br>
</div>
<blockquote type="cite" cite="mid:E3F9A1DC-1A61-4A25-82DC-BA85EE92CCF8@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Hi,
<div>You can create a geometry from WKT if you have x and y fields
using and expression in the field calculator.</div>
<div>
<pre style="color: var(--highlight-color); -webkit-text-size-adjust: auto; margin-top: 0px; margin-bottom: 0px; padding: 12px; border: 0px; font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace, sans-serif; font-stretch: inherit; line-height: 1.30769231; font-size: 13px; vertical-align: baseline; box-sizing: inherit; width: auto; max-height: 600px; overflow: auto; border-top-left-radius: 5px; border-top-right-radius: 5px; border-bottom-right-radius: 5px; border-bottom-left-radius: 5px; word-wrap: normal;"><code style="margin: 0px; padding: 0px; border: 0px; font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace, sans-serif; font-style: inherit; font-variant-caps: inherit; font-stretch: inherit; line-height: inherit; vertical-align: baseline; box-sizing: inherit; white-space: inherit; color: var(--black-800); border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px;">geom_from_wkt('POINT('||"x"||' '||"y"||')')</code></pre>
<div><br>
</div>
<div><a href="https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry" moz-do-not-send="true">https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry</a></div>
<div><br>
</div>
<div dir="ltr">Nicolas Cadieux</div>
<div dir="ltr"><br>
<blockquote type="cite">Le 13 nov. 2020 à 09:07, Andreas
Neumann <a class="moz-txt-link-rfc2396E" href="mailto:a.neumann@carto.net"><a.neumann@carto.net></a> a écrit :<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Hi</p>
<p>Neither GeometryGenerators nor Vector Field Markers work
on tables without geometry, unfortunately. You didn't
inform us, that you don't have geometry in your table.<br>
</p>
<p>You can, however, create a "Virtual Layer" and write some
SQL to create a geometry from your attributes: menu
"Layer" --> "Create Layer" --> "New Virtual Layer" -
where you can use your existing tables and create a new
geometry column with SQL. See
<a class="moz-txt-link-freetext" href="https://docs.qgis.org/testing/en/docs/user_manual/managing_data_source/create_layers.html#creating-virtual-layers" moz-do-not-send="true">https://docs.qgis.org/testing/en/docs/user_manual/managing_data_source/create_layers.html#creating-virtual-layers</a></p>
<p>Or, if your table is a CSV file, then you can assign
attribute columns to a point geometry and then just hide
the point rendering if you don't need it.<br>
</p>
<p>This is an unfortunate limitation of QGIS, that there is
no "easy" way to add a geometry column to table that
doesn't have geometry (or if it is possible, then I don't
know it).</p>
<p>Hope this helps you,</p>
<p>Andreas<br>
</p>
<div class="moz-cite-prefix">Am 13.11.20 um 14:52 schrieb
L.W.:<br>
</div>
<blockquote type="cite" cite="mid:7f9befd5-d44c-8aec-7036-71461c7964e2@gmx.de">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Does it works on Layers with no geometry?</p>
<p>My layers do not have a geometry.</p>
<p><br>
</p>
<div class="moz-cite-prefix">Am 13.11.2020 um 11:56
schrieb Andreas Neumann:<br>
</div>
<blockquote type="cite" cite="mid:80d2b9f3-0896-999d-a5ab-17ad4573d522@carto.net">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Yes, you need point data to start from, but then
vectors can bei/are generated from the attributes you
mentioned.</p>
<p>Andreas<br>
</p>
<div class="moz-cite-prefix">Am 13.11.20 um 11:47
schrieb L.W.:<br>
</div>
<blockquote type="cite" cite="mid:cd1f5b7c-4703-530f-d5b7-b51caa5632d5@gmx.de">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>from the docs ...</p>
<p>****It can only be used to render point data****</p>
<h4 style="box-sizing: border-box; margin-top: 0px;
font-weight: 700; font-family: "Roboto
Slab", ff-tisa-web-pro, Georgia, Arial,
sans-serif; font-size: 18.4px; color: rgb(64, 64,
64); font-style: normal; font-variant-ligatures:
normal; font-variant-caps: normal; letter-spacing:
normal; orphans: 2; text-align: start; text-indent:
0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color:
rgb(252, 252, 252); text-decoration-style: initial;
text-decoration-color: initial;"><a class="toc-backref" href="https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#id15" style="box-sizing: border-box; color: rgb(64, 64,
64); text-decoration: none; cursor: pointer;
outline-width: 0px !important; user-select: auto
!important;" moz-do-not-send="true"><span class="section-number" style="box-sizing:
border-box;">12.2.2.2.6.<span> </span></span>The
Vector Field Marker</a></h4>
<p class="" style="box-sizing: border-box;
line-height: 24px; font-size: 16px; margin: 0px 0px
24px; color: rgb(64, 64, 64); font-family: Lato,
proxima-nova, "Helvetica Neue", Arial,
sans-serif; font-style: normal;
font-variant-ligatures: normal; font-variant-caps:
normal; font-weight: 400; letter-spacing: normal;
orphans: 2; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows:
2; word-spacing: 0px; -webkit-text-stroke-width:
0px; background-color: rgb(252, 252, 252);
text-decoration-style: initial;
text-decoration-color: initial;">The vector field
marker is used to display vector field data such as
earth deformation, tidal flows, and the like. It
displays the vectors as lines (preferably arrows)
that are scaled and oriented according to selected
attributes of data points. ****It can only be used
to render point data****; line and polygon layers
are not drawn by this symbology.</p>
<p style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px 0px 24px; color:
rgb(64, 64, 64); font-family: Lato, proxima-nova,
"Helvetica Neue", Arial, sans-serif;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align:
start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color:
rgb(252, 252, 252); text-decoration-style: initial;
text-decoration-color: initial;">The vector field is
defined by attributes in the data, which can
represent the field either by:</p>
<ul class="simple" style="box-sizing: border-box;
margin: 0px 0px 24px; padding: 0px; list-style:
disc; line-height: 24px; color: rgb(64, 64, 64);
font-family: Lato, proxima-nova, "Helvetica
Neue", Arial, sans-serif; font-size: 16px;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align:
start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color:
rgb(252, 252, 252); text-decoration-style: initial;
text-decoration-color: initial;">
<li style="box-sizing: border-box; list-style: disc;
margin-left: 24px;">
<p style="box-sizing: border-box; line-height:
24px; font-size: 16px; margin: 0px;"><strong style="box-sizing: border-box; font-weight:
700;">cartesian</strong><span> </span>components
(<code class="docutils literal notranslate" style="box-sizing: border-box; font-family:
SFMono-Regular, Menlo, Monaco, Consolas,
"Liberation Mono", "Courier
New", Courier, monospace; font-size:
12px; white-space: nowrap; max-width: 100%;
background: rgb(255, 255, 255); border: 1px
solid rgb(225, 228, 229); padding: 2px 5px;
color: rgb(231, 76, 60); overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">x</span></code><span> </span>and<span> </span><code class="docutils literal notranslate" style="box-sizing: border-box; font-family:
SFMono-Regular, Menlo, Monaco, Consolas,
"Liberation Mono", "Courier
New", Courier, monospace; font-size:
12px; white-space: nowrap; max-width: 100%;
background: rgb(255, 255, 255); border: 1px
solid rgb(225, 228, 229); padding: 2px 5px;
color: rgb(231, 76, 60); overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">y</span></code><span> </span>components
of the field)</p>
</li>
<li style="box-sizing: border-box; list-style: disc;
margin-left: 24px;">
<p style="box-sizing: border-box; line-height:
24px; font-size: 16px; margin: 0px;">or<span> </span><strong style="box-sizing: border-box; font-weight:
700;">polar</strong><span> </span>coordinates:
in this case, attributes define<span> </span><code class="docutils literal notranslate" style="box-sizing: border-box; font-family:
SFMono-Regular, Menlo, Monaco, Consolas,
"Liberation Mono", "Courier
New", Courier, monospace; font-size:
12px; white-space: nowrap; max-width: 100%;
background: rgb(255, 255, 255); border: 1px
solid rgb(225, 228, 229); padding: 2px 5px;
color: rgb(231, 76, 60); overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">Length</span></code><span> </span>and<span> </span><code class="docutils literal notranslate" style="box-sizing: border-box; font-family:
SFMono-Regular, Menlo, Monaco, Consolas,
"Liberation Mono", "Courier
New", Courier, monospace; font-size:
12px; white-space: nowrap; max-width: 100%;
background: rgb(255, 255, 255); border: 1px
solid rgb(225, 228, 229); padding: 2px 5px;
color: rgb(231, 76, 60); overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">Angle</span></code>.
The angle may be measured either clockwise from
north, or Counterclockwise from east, and may be
either in degrees or radians.</p>
</li>
<li style="box-sizing: border-box; list-style: disc;
margin-left: 24px;">
<p style="box-sizing: border-box; line-height:
24px; font-size: 16px; margin: 0px;">or as<span> </span><strong style="box-sizing: border-box; font-weight:
700;">height only</strong><span> </span>data,
which displays a vertical arrow scaled using an
attribute of the data. This is appropriate for
displaying the vertical component of
deformation, for example.</p>
</li>
</ul>
<p style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px 0px 24px; color:
rgb(64, 64, 64); font-family: Lato, proxima-nova,
"Helvetica Neue", Arial, sans-serif;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align:
start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color:
rgb(252, 252, 252); text-decoration-style: initial;
text-decoration-color: initial;">The magnitude of
field</p>
<p style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px 0px 24px; color:
rgb(64, 64, 64); font-family: Lato, proxima-nova,
"Helvetica Neue", Arial, sans-serif;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align:
start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color:
rgb(252, 252, 252); text-decoration-style: initial;
text-decoration-color: initial;"><br>
</p>
<div class="moz-cite-prefix">Am 13.11.2020 um 11:34
schrieb Andreas Neumann:<br>
</div>
<blockquote type="cite" cite="mid:9d5955ce-6f3b-14ba-b27c-5f409d3382cd@carto.net">Or
even easier: use the "Vector Field Marker": <br>
<br>
<a class="moz-txt-link-freetext" href="https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#the-vector-field-marker" moz-do-not-send="true">https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#the-vector-field-marker</a>
<br>
<br>
Am 13.11.20 um 11:33 schrieb Andreas Neumann: <br>
<blockquote type="cite">Hi, <br>
<br>
Yes - you can use Geometry Generators for that.
Use the make_point() and make_line() expressions
for that. <br>
<br>
See <a class="moz-txt-link-freetext" href="https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?highlight=geometry%20generator#the-geometry-generator" moz-do-not-send="true">https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?highlight=geometry%20generator#the-geometry-generator</a><br>
<br>
Greetings, <br>
Andreas <br>
<br>
Am 13.11.20 um 11:26 schrieb L.W.: <br>
<blockquote type="cite">Hi, <br>
<br>
is it possible to draw automatically a line
between two points defined <br>
by 4 fields (x1,y1 - x2,y2) in an
attributetable? <br>
<br>
but I do not want to add a line-layer based on
this table nor want to <br>
draw the line by hand. <br>
<br>
thanks <br>
<br>
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