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On 11/26/2011 04:58 PM, David wrote:
<blockquote
cite="mid:1322319488.59553.YahooMailNeo@web24102.mail.ird.yahoo.com"
type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255); font-family: times new roman,new york,times,serif;
font-size: 12pt;">
<div>Hello again</div>
<div>I'm still having trouble using a csv file. </div>
<div><br>
</div>
<div>Having loaded the csv file as a layer, right click
properties opens the layer properties box for the csv file and
Fields has the full list of columns in my file: so far, so
good. </div>
<div><br>
</div>
<div>However they are all described as string, width 0 and
precision 0 when many should be integer or decimal. Is it
possible to change them in the properties box? I looked at
the User Manual but don't understand the Edit widget.</div>
<div><br>
</div>
</div>
</blockquote>
<br>
Maybe try creating the associated *.csvt file. From the GDAL [1]
site:<br>
Limited type recognition can be done for Integer, Real, String, Date
(YYYY-MM-DD), Time (HH:MM:SS+nn) and DateTime (YYYY-MM-DD
HH:MM:SS+nn) columns through a descriptive file with same name as
the CSV file, but .csvt extension. In a single line the types for
each column have to be listed: double quoted and comma separated
(e.g., "Integer","String"). It is also possible to specify
explicitely the width and precision of each column, e.g.
"Integer(5)","Real(10.7)","String(15)". The driver will then use
these types as specified for the csv columns.<br>
<br>
And a bit more on Anita's blog [2].<br>
<br>
[1] <a class="moz-txt-link-freetext" href="http://www.gdal.org/ogr/drv_csv.html">http://www.gdal.org/ogr/drv_csv.html</a><br>
[2]
<a class="moz-txt-link-freetext" href="http://underdark.wordpress.com/2011/03/07/how-to-specify-data-types-of-csv-columns-for-use-in-qgis/">http://underdark.wordpress.com/2011/03/07/how-to-specify-data-types-of-csv-columns-for-use-in-qgis/</a><br>
<blockquote
cite="mid:1322319488.59553.YahooMailNeo@web24102.mail.ird.yahoo.com"
type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255); font-family: times new roman,new york,times,serif;
font-size: 12pt;">
<div>David Asquith</div>
<div>UK</div>
</div>
<br>
<br>
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</blockquote>
<p><br>
</p>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
GIS Consultant, Arava Development Co.
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il">http://www.surfaces.co.il</a></pre>
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