Timeline for How can I create a merged buffer in QGIS then count points that fall within it
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 13, 2013 at 20:38 | comment | added | Jo Pedder | I get a blank shape file after clicking ok in the Join attributes dialogue box, then it asks if I would like a new layer in the TOC, to which I say yes. A new layer appears, which I cant 'see' on the plan and the attribute table is empty. | |
| Dec 13, 2013 at 20:28 | comment | added | artwork21 | Blank shapefile, after what step? | |
| Dec 13, 2013 at 20:26 | comment | added | Jo Pedder | ok, I've now tried this. When following as per your direction, I end up with a new shapefile which appears blank. I have used the layer "onsite pond buffer" as the target vector layer and the layer "ponds" as the join vector layer. If I re-run selecting keep all records, I get all the pond references, but NULL results for SUM. This must mean that QGIS doesn't think that there pond points within those buffers (but there are plenty). | |
| Dec 13, 2013 at 17:40 | comment | added | artwork21 | @Jo Pedder, See my update answer. | |
| Dec 13, 2013 at 17:40 | history | edited | artwork21 | CC BY-SA 3.0 |
added 301 characters in body
|
| Dec 13, 2013 at 16:52 | comment | added | Jo Pedder | @Gerald and artwork21. Thank you for you help. For Question 2, your suggestion works well. I can select each buffer in turn and use spatial query for the layer with the on-site ponds and the layer with the off site ponds, then add the two. There are some 26 ponds, so this would take 52 queries. Is there another way to run the query once and get the count from two layers for each buffer separately? - even if I just had to run it twice, once for each layer that would be useful. | |
| Dec 13, 2013 at 16:22 | comment | added | Jo Pedder | thank you - I had tried dissolve early on, but perhaps without the dissolve all, this works perfectly. | |
| Dec 13, 2013 at 16:21 | vote | accept | Jo Pedder | ||
| Dec 16, 2013 at 10:53 | |||||
| Dec 13, 2013 at 15:45 | history | answered | artwork21 | CC BY-SA 3.0 |