[Osgeo4w-trac] [osgeo4w] #421: BAG uncertainty NoData value should be 1000000, not 0

[OSGeo4W]

#421: BAG uncertainty NoData value should be 1000000, not 0
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Reporter:  jdvarner  |       Owner:  osgeo4w-dev@…              
    Type:  defect    |      Status:  new                        
Priority:  minor     |   Component:  Package                    
 Version:            |    Keywords:  GDAL BAG                   
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 The NODATA value for the uncertainty in BAG files is being reported as 0.
 However, I think it should be set to 1000000.

 There's some inconsistency in the documentation:
 From OpenNavSurf
 (http://www.opennavsurf.org/papers/BAG_FSD_Release_1.5.1.pdf, page 11):
 "The *unknown* state for uncertainty is defined to be 0.0"

 From IHO S-102 Format Standard
 (http://www.iho.int/iho_pubs/standard/S-102/S-102_Ed1.0.0_Apr12.pdf, page
 34):
 "The *undetermined* state for uncertainty is defined to be 1,000,000.0
 (1.0e6)."

 I've checked a sampling of BAGs that we archive here at NOAA/NGDC. All of
 them have 1000000 in the uncertainty band in areas with no data.

 Thanks to Mike Wilburn from Esri for pointing out this issue.

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Ticket URL: <http://trac.osgeo.org/osgeo4w/ticket/421>
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