Hi Alex,
I tried some of the performance tips you mentioned, e.g. converted the
.txt to a tiled TIFF to optimize performance. I can not see significant
changes in rendering speed.
gdal_translate -co TILED=YES input.txt output.tif
The major brake still is the expression stuff. I really wonder
On 10-07-28 09:25 AM, Tobias Weiß wrote:
The major brake still is the expression stuff. I really wonder what
makes this task so time-consuming, it should not be more than a simple
comparison.
Do you have experiences with this issue? Or do I have to live with
this constraint?
With vector
I don't know anything about your work flow, but if possible, you could add a
pre-processing step where you use a script to read your text file and
pre-classify the data. You would end up with integers representing each class
as 'cell' values.
Instead of :
EXPRESSION([pixel] = -4 AND [pixel]
Fawcett, David (MPCA) wrote:
I don’t know anything about your work flow, but if possible, you could
add a pre-processing step where you use a script to read your text file
and pre-classify the data. You would end up with integers representing
each class as ‘cell’ values.
Instead of :
