Steve Ansari wrote:
Yuan,
Yes. That is what I got too.
Steve
These two tags should be recognized by Arcmap, and no idea what's wrong
here.
Yuan
Yuan Ho wrote:
Steve Ansari wrote:
Yuan,
I've put the files on our FTP site:
http://www1.ncdc.noaa.gov/pub/download/KSGF_NTP_20050105_0004.nc
http://www1.ncdc.noaa.gov/pub/download/KSGF_NTP_20050105_0004.tif
Thanks for looking into this,
Steve
Steve,
What I got is:
15 IFDEntry == tag = 340 (SMinSampleValue) type = FLOAT count = 1
values = 0.0
16 IFDEntry == tag = 341 (SMaxSampleValue) type = FLOAT count = 1
values = 3.0
Does it look right?
Yuan
Yuan Ho wrote:
Steve Ansari wrote:
Yuan,
I'm not using greyscale. I've printed out the max and min values
from the section of GeotiffWriter.java that sets the tag values to
verify that the correct max/min values are calculated. It appears
that they are.
MAMath.MinMax dataMinMax = grid.getMinMaxSkipMissingData( data);
float min = (float) (dataMinMax.min);
float max = (float) (dataMinMax.max);
System.out.println(min+","+max); geotiff.addTag( new
IFDEntry(Tag.SMinSampleValue, FieldType.FLOAT).setValue( min));
geotiff.addTag( new IFDEntry(Tag.SMaxSampleValue,
FieldType.FLOAT).setValue( max));
Steve,
Could you send me a copy of this nc file? Or a ftp site
if the file is too big.
Yuan
Thanks,
Steve
Yuan Ho wrote:
Steve Ansari wrote:
Hi John,
I did have one other question...
I've been exporting GeoTIFFs from NetCDF files using the
ucar.nc2.geotiff.GeotiffWriter class. When I load the images in
ESRI ArcMap the default max and min values are incorrect. Ex)
High : 3.40282e+038
Low : 1.17549e-038
Steve,
Is the output file greyscale? Otherwise the min and max
value should be stored in these two tags: Tag.SMinSampleValue and
Tag.SMaxSampleValue.
Let me know how do you get these High and Low values, and what
are the values of above two tags.
Yuan
The actual data values are ok and the image is correctly
geolocated. It seems that there may be max/min header or tag
information that may be missing.
Thanks,
Steve
