You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
The y-coordinates for groups imported from raster files are offset by one pixel southwards. The issue is that the half pixel distance is subtracted from instead of being added when calculating the final cell coordinate.
This is a long standing bug. The main impact is where data are imported from multiple sources, e.g. raster and shapefile. Otherwise the cells will be consistently shifted so any calculations are consistently offset (think of it as a spatially global error for an internally consistent data set). Another point of impact is where shapefiles are used to define regions in spatial conditions when analysing such offset basedatas. It is unclear how common this is.
Update: This only affects north-oriented rasters, i.e. those that list the rows of the raster from the bottom up. Most do the reverse, i.e. the top row is listed first in the file.
Update 2: Nope, this affected a range of files, not just north orientated
The text was updated successfully, but these errors were encountered:
shawnlaffan
changed the title
Basedata raster imports shifted south by one pixel
Basedata raster imports shifted south by one pixel - affects north oriented files
Jan 31, 2023
shawnlaffan
changed the title
Basedata raster imports shifted south by one pixel - affects north oriented files
Basedata raster imports shifted south by one pixel
Jan 31, 2023
The y-coordinates for groups imported from raster files are offset by one pixel southwards. The issue is that the half pixel distance is subtracted from instead of being added when calculating the final cell coordinate.
This is a long standing bug. The main impact is where data are imported from multiple sources, e.g. raster and shapefile. Otherwise the cells will be consistently shifted so any calculations are consistently offset (think of it as a spatially global error for an internally consistent data set). Another point of impact is where shapefiles are used to define regions in spatial conditions when analysing such offset basedatas. It is unclear how common this is.
Update: This only affects north-oriented rasters, i.e. those that list the rows of the raster from the bottom up. Most do the reverse, i.e. the top row is listed first in the file.
Update 2: Nope, this affected a range of files, not just north orientated
The text was updated successfully, but these errors were encountered: