[postgis-users] Pixel size verses tile size

[muhammad imran]

hi People,

I am trying to import *.tif files into PG. These tif images
are basically the MODIS data (three images covering the
whole study area, pixel size 500m). But, when I try to load
them I got the following error 
Error: > Cannot load raster with different pixel size in the same
raster table
(However, individually the images can be loaded into three
different raster tables)
 
Secondly, does the tiling (with -k 100X100) physically
merges these pixels into on big pixel of the size of 100X100
pixels or it is just logical merging and the pixel size
remain 500m.

Regards,
Imran