nsw_lidar
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revision | Next revisionBoth sides next revision | ||
nsw_lidar [2020/08/05 18:50] – bushwalking | nsw_lidar [2020/08/05 21:14] – [Merge DEMs] bushwalking | ||
---|---|---|---|
Line 24: | Line 24: | ||
The NSW DEM data is supplied in 2km squares. The squares need to be merged into a single DEM for further operations. | The NSW DEM data is supplied in 2km squares. The squares need to be merged into a single DEM for further operations. | ||
- | While this can be done in theory using a Virtual Raster, I have had poor performance with this (including recent version 3.12 Bucuresti). Any operation seems to result in screen redrawing, so moving around | + | Most of the eastern ranges, where a lot of bushwalking happens, are 2m DEMs. The coast is typically 1m, and the western slopes |
- | <insert function here> | + | ==== Virtual Raster ==== |
+ | |||
+ | While merging can be done in theory using a Virtual Raster (Raster- | ||
+ | |||
+ | That said, if you are just using the Virtual Raster for future steps, then the limitations from the screen redrawing may not be important. | ||
+ | |||
+ | QGIS uses [[https:// | ||
+ | |||
+ | |||
+ | ==== Merge Raster ==== | ||
I generally use the the Raster- > Miscellaneous -> Merge... function | I generally use the the Raster- > Miscellaneous -> Merge... function | ||
- | Note that while most of the eastern ranges, where a lot of bushwalking happens, are 2m DEMs, the coast is typically 1m, and the western slopes and plains are 5m (with major rivers 1m!). | ||
QGIS uses [[https:// | QGIS uses [[https:// |
nsw_lidar.txt · Last modified: 2024/04/05 19:00 by bushwalking