Opened 9 years ago
Closed 5 years ago
#5762 closed enhancement (wontfix)
Add indexing to VRT raster implementation
| Reported by: | hrz | Owned by: | warmerdam |
|---|---|---|---|
| Priority: | normal | Milestone: | closed_because_of_github_migration |
| Component: | GDAL_Raster | Version: | svn-trunk |
| Severity: | normal | Keywords: | |
| Cc: |
Description
As described in the conversation at http://article.gmane.org/gmane.comp.gis.gdal.devel/39099 there is no indexing in the VRT implementation. For VRT data sources with a large number of source datasets (over 700,000 in the example) this lack of indexing can lead to performance problems since each RasterIO() request will have to go test if each source interstects the requested area of interest.
Possible solutions mentioned in the mailing list include adding an in-memory spatial index after opening the VRT.
Another solution mentioned included referencing a shapefile tile index as a VRT datasource and delegating indexing to that format. From my point of view having a shapefile tile index as a first class raster datasource would be very useful.
It is possible the OGR VRT implementation could benefit from similar enhancement.
Change History (1)
comment:1 by , 5 years ago
| Milestone: | → closed_because_of_github_migration |
|---|---|
| Resolution: | → wontfix |
| Status: | new → closed |
This ticket has been automatically closed because Trac is no longer used for GDAL bug tracking, since the project has migrated to GitHub. If you believe this ticket is still valid, you may file it to https://github.com/OSGeo/gdal/issues if it is not already reported there.