<div dir="ltr">I have replied to your questions in-line, below:<br><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 30, 2015 at 11:03 AM, Alex Mandel <span dir="ltr"><<a href="mailto:tech_dev@wildintellect.com" target="_blank">tech_dev@wildintellect.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Kenneth,<br>
<br>
How many records, and how much memory do the files take on disc?<br></blockquote><div>The Zip.shp file contains 41,342 rows and takes up ca. 400KB on disk.<br></div><div>The Zip2Terr.csv file contains 87,632 rows and occupies 4KB on disk. <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Are you joining the SHP and the CSV and then doing Dissolve?</blockquote><div>Yes. <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Did you<br>
save the joined layer to a new file? </blockquote><div>Yes <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Does this shapefile have a spatial<br>
index created?</blockquote><div>Yes <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Is the topology of the polygons clean (are there self<br>
intersections, lots of slivers, or overlaps?<br></blockquote><div>It is clean. There don't appear to be any slivers. <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Other than saving the intermediate to a file, the next suggestion is to<br>
use Spatialite or Postgis databases.<br></blockquote><div>Can you elaborate a little on what's involved in using one of the two named databases?<br></div><div>Do I simply need to read the .csv file into Spatiallite or Postgres? <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Keep in mind, that an operation like this is single threaded.<br>
<br>
Thanks,<br>
Alex<br>
<div><div class="h5"><br>
On 08/30/2015 09:53 AM, Ken Walenga wrote:<br>
> Looking for help. I have an unsimplified ZIP.shp file and want to create my<br>
> own custom boundary files for territories which are a collection of zip<br>
> code areas. I bring in the Zip.shp file and join to a Zip2Terr.csv file on<br>
> the Zip field. When I try to dissolve the TERR_NBR field, the dissolve<br>
> process can take longer than 2 whole days (!). Any ideas on ways to speed<br>
> it up? I have tried using a simplified Zip.shp file, but that results in<br>
> way less than satisfactory boundary files with gaps, etc. Might this be a<br>
> problem with v2.10? Is it possible that I would see better performance<br>
> using an earlier rev?<br>
><br>
> I am using v2.10 of QGIS, running on a Win7 HP destop machine, quad core, 8<br>
> GB RAM.<br>
><br>
> Thanks.<br>
><br>
> ----<br>
> Kenneth Walenga<br>
> Commercial BI & Reporting<br>
> Genentech, A Member of the Roche Group<br>
> US CommOps - USMA Data Services<br>
> "Every moment matters. Making IT happen."<br>
> (O) 650-467-6855<br>
> (F) 650-467-2570<br>
> (M) 650-438-4505<br>
><br>
><br>
><br>
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