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I see a different output, namely: > m2 <- update( m1, corr = corExp(c(300, 0.7), form = ~ x + y, nugget = T) ) Error in lme.formula(fixed = log(zinc) ~ 1, data = meuse, random = ~1 | : nlminb problem, convergence error code = 1 message = false convergence (8) this is nlme_3.1-119 on R version 3.1.2 (2014-10-31) Platform: x86_64-pc-linux-gnu ...


Depending on your image type you can use Esri Raster Mosaic dataset - have your tiles and mosaic too without any (much) extra storage. The mosaic dataset works like a VRT file where the rasters are referenced but not imported so the table in the database stores the path and location of the tiles; overviews are a good idea but they don't take up much space. ...


I've done some work of this manner. Archaeologists love their giant DEMs for some reason... I don't have anything formal but can lend some insight from experience. I found it was nice to have something that covered the whole area but it doesn't need to be at the highest resolution you've got. For example, a mosaic of the DEMs for the whole area at 1/3 ...


There is a new option as well, which is www.aequilibrae.com, working as a plugin for QGIS (I need to disclose that I am the developer of it). It much less powerfull than TRANUS, but it is completely written in python and cython.

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