.bt bugs on write

[warmerdam]

Frank Warmerdam wrote:

> OK, I found a serious bug in reading the georef bounds from .bt, and
> the imagery access was completely messed up think it was row-record
> data as I am accustomed to.  I have committed fixes for the problems,
> and I think it is working now, but the read/write access is deathly
> slow because each scanline read results in reading through the whole
> file.


It is indeed deathly slow. However I could live with that if it allowed me to
automate conversion of our AI grids to VT. Unfortunately it still doesn't work
(as of gdalcvs-040203.zip). A sample dataset is attached which holds both my
source data and the results.

> This could be corrected but would require substantial effort.

Ben is this something you have some insight into? Loading an ArcInfo Binary Grid
into VTBuilder and saving it out as .bt doesn't take all that long.

> I kind of regret doing the driver now.

Not so much that you'll pull it out altogether I hope! (but then again I guess
if it doesn't work there's not much point in keeping it around.)


thanks in advance,

-- 
matt wilkie

[warmerdam]

All problems corrected with what is essentially a rewrite of the driver.