#1277 closed bug (wontfix)
digitizing with snapping option works verry slow
| Reported by: | gespiel | Owned by: | nobody |
|---|---|---|---|
| Priority: | major: does not work as expected | Milestone: | |
| Component: | Digitising | Version: | Trunk |
| Keywords: | Cc: | ||
| Must Fix for Release: | No | Platform: | All |
| Platform Version: | XP, sp2 | Awaiting user input: | no |
Description
when "snapping options" in the menue "project properties" ist enabled to a large shp-layer (17.000 objects) the digitize function (edit shp file) work verry slow.
Attachments (2)
Change History (13)
comment:1 by , 16 years ago
comment:3 by , 16 years ago
| Component: | Build/Install → Digitising |
|---|---|
| Platform: | Windows → All |
comment:4 by , 16 years ago
The most effective way to speed up the snapping is to have a spatial index. Otherwise, every vertex of the whole dataset needs to be tested.
Do you already have an index on the dataset? If not, you may create one in the vector layer properties dialog:
Open vector layer properties dialog, go to tab 'general', press button named 'create spatial index'.
Marco
by , 16 years ago
| Attachment: | raeumlicher_index.pdf added |
|---|
follow-up: 6 comment:5 by , 16 years ago
Thanks for advice, but creating spatial index failes (see attached pdf-file
comment:6 by , 16 years ago
Replying to gespiel:
Thanks for advice, but creating spatial index failes
Works for me, with my data. If you can still reproduce it please open a separate ticket and attach sample data to reproduce the problem.
(see attached pdf-file
FWIW, you can attach JPEGs or PNGs as well.
comment:8 by , 16 years ago
Replying to gespiel:
sample data produce the same problem (see attached jpg)
I asked you to open a separate ticket for the issue regarding spatial index. It's bad to discuss 2 separate issues in the same ticket.
And please upload some sample data into that new ticket (e.g. a Shapefile) to reproduce the problem with - a screendump is not enough!
comment:10 by , 16 years ago
| Resolution: | → wontfix |
|---|---|
| Status: | new → closed |
I'm closing this ticket as the problem is covered by the new ticket. Without a spatial index, it is not possible to have good snapping performance for large data files.
Marco
A way to speed digitizing up was to use "Cross" instead of "Semi transparent circle" for the "Marker style" in Preferences, in my case. See if that helps and please report back.