I am using 30m SRTM DEM data but there are many no data pixels, how could i resolve this problem?
There is an attachment of screen shot.
What is the classification scheme you used?
Look at the histogram, I suspect you have data but you have data, but clouds (perhaps, which is causing the image to be stretched. Consider reclassifying it to you can reveal it
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I did not use any classification scheme, it is a DEM and i downloaded for ArcHydro processing. In ArcGIS version 9X there was an extension named HEC-GeoDozer and i used this extension for no data values in DEM, but now this extension is not available for ArcGIS version 10X.
if the histogram shows 2 classes, then it already has been classed. If it has a table, open it up, what is shown? otherwise examine the histogram. If you want to get rid of nodata pixels, there is a procedure, but there is no point in going into it unless you can confirm that there is actual elevation data. Search this site using filling gaps in SRTm
so unless you have negative elevations in your location, then that is noise. and It appears that the maximum elevation in your area is about 800, if it really goes up to 1063 meters, then that data is also noise. So try to use a manual classification rather than a stretched std dev classification. Try 8 classes from 0-100, 100-200 etc and see what you get
Thank you so much Dan now i got you , problem solved..
Retrieving data ...