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Sent from my phone
On Mar 31, 2010, at 9:59 PM, David <[email protected]> wrote:
Hello. First posting on this list but I have been working with
Mapnik for a couple months now and have appreciated the assistance
provided by others.
I would like to make sure I understand what http://trac.mapnik.org/ticket/54
provides and how it may help me. If I have a large tiff file such
as one that would represent hill shading for the entire United
States created with gdalmerge, at low zoom levels when one tile
represents the entire US, the entire tiff file would have to be
loaded into memory and scaled by Mapnik. This would probably not be
possible because of the large memory requirements. With support for
overviews created with gdaladdo, in 0.7.0 I could create many
overviews for different zoom levels that would have considerably
smaller memory footprint then the full resolution tiff file. The
only downside to this approach is the increased disk space required
for the overviews. Are these statements correct and/or is this
the correct approach?
Yes.
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