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Re: [las_users] overriding subsampling
Hi Upendra,
Subsampling is in LAS to prevent overly large data requests, and is done
in a way to try to minimize the effect on the end result. It is not done
for data downloads, only graphics.
The Ferret scripts compute the amount of striding based first on the
amount of memory available to Ferret running as the backend. Next, they
compute the size in pixels of the output image and base the amount of
sampling on that - if there are 600x800 pixels then we won't get a
better 2D image by using full-resolution data that is larger than that.
Time series plots may lose some extreme values of course, so there's an
argument for allowing control in some cases. If the time series is being
extracted from, say, an aggregation of many large datasets, it can
create huge requests, so one wants to think it through. Allowing control
that at the level of the LAS installer means that you could decide when
to turn this on or off.
Right now there's not a way to override this in the configuration but it
could be added. I'll write you off-line and we can talk about some ideas.
You're quite right that we need documentation that lists the Ferret
properties that can be used for customizing dataset configurations. I've
added an item to our to-do list to create that.
Ansley
On 6/9/2011 1:31 PM, Upendra Dadi wrote:
Hi,
For some of the time series graphs, LAS puts the following on top of
the graph "Subsampled x in T". How do I override subsampling and show
the entire data? Is there a Ferret property I need to override? Also,
is there a list of mapping between Ferret properties and the
corresponding LAS XML tags. Please help. Thanks!
Upendra
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