[postgis-devel] [PostGIS] #1005: [raster] Problem with ST_SummaryStats(text, text) results
PostGIS
trac at osgeo.org
Tue Jun 7 16:55:56 PDT 2011
#1005: [raster] Problem with ST_SummaryStats(text, text) results
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Reporter: pracine | Owner: pracine
Type: defect | Status: new
Priority: medium | Milestone: PostGIS 2.0.0
Component: postgis raster | Version: trunk
Keywords: |
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Comment(by dustymugs):
Thanks for catching the error with the sum as I forgot to collect the sum
for coverages. My next revision will fix that.
As for the standard deviation of a coverage, I do confirm the issue. To
do this correctly will require going over the coverage table twice, once
for the coverage's mean and the second for the mean's standard deviation.
So, do we want to be accurate at the expense of speed or be close at the
expense of accuracy? Maybe we need to add an option flagging whether or
not to get the accurate standard deviation for a coverage?
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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1005#comment:2>
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