topic Can some one explain how standard deviation is calculated for a multiband image? in Spatial Statistics Questions https://community.esri.com/t5/spatial-statistics-questions/can-some-one-explain-how-standard-deviation-is/m-p/510189#M1630 <HTML><HEAD></HEAD><BODY><SPAN>Hi all,</SPAN><BR /><BR /><SPAN>I have been working with multiband images and on calculating standard deviation I am not sure what happens ? So can some one explain how standard deviation is calculated for a multiband image? Usually its a single band operation so how is it dealt with in ARC GIS?</SPAN><BR /><BR /><SPAN>Thanks and Regards </SPAN><BR /><SPAN>Samee</SPAN></BODY></HTML> Fri, 20 Sep 2013 11:07:23 GMT Sameeazmi 2013-09-20T11:07:23Z Can some one explain how standard deviation is calculated for a multiband image? https://community.esri.com/t5/spatial-statistics-questions/can-some-one-explain-how-standard-deviation-is/m-p/510189#M1630 <HTML><HEAD></HEAD><BODY><SPAN>Hi all,</SPAN><BR /><BR /><SPAN>I have been working with multiband images and on calculating standard deviation I am not sure what happens ? So can some one explain how standard deviation is calculated for a multiband image? Usually its a single band operation so how is it dealt with in ARC GIS?</SPAN><BR /><BR /><SPAN>Thanks and Regards </SPAN><BR /><SPAN>Samee</SPAN></BODY></HTML> Fri, 20 Sep 2013 11:07:23 GMT https://community.esri.com/t5/spatial-statistics-questions/can-some-one-explain-how-standard-deviation-is/m-p/510189#M1630 Sameeazmi 2013-09-20T11:07:23Z Re: Can some one explain how standard deviation is calculated for a multiband image? https://community.esri.com/t5/spatial-statistics-questions/can-some-one-explain-how-standard-deviation-is/m-p/510190#M1631 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE class="jive-quote">Hi all,<BR /><BR />I have been working with multiband images and on calculating standard deviation I am not sure what happens ? So can some one explain how standard deviation is calculated for a multiband image? Usually its a single band operation so how is it dealt with in ARC GIS?<BR /><BR />Thanks and Regards <BR />Samee</BLOCKQUOTE><BR /><BR /><SPAN>Hi Samee,</SPAN><BR /><BR /><SPAN>Not sure which aspect you refer to, so I�??ll try to tackle a few. </SPAN><BR /><BR /><STRONG>Visualization of multispectral raster data</STRONG><BR /><SPAN>When you display a multispectral image you have the possibility to stretch the bands before the Red, Green and Blue components are combined to&nbsp; a color. One of the stretch methods is �??Standard deviation�?�. In this case it is calculated per band for all cells. More info here:</SPAN><BR /><A href="http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000059000000">http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000059000000</A><SPAN> </SPAN><BR /><BR /><SPAN>If you look at the explanation in the �??Raster data statistics�?� you�??ll see that:</SPAN><BR /><SPAN>"</SPAN><SPAN style="font-style:italic;"><SPAN style="text-decoration:underline;">Statistics are calculated for each band</SPAN>; if there is more than one band in the raster dataset, the statistics for each band are present. You can see that the parameters used to build the statistics are listed. The statistics that are calculated include the minimum and maximum pixel values as well as the mean and standard deviation of the calculated pixel values�?�</SPAN><SPAN>". More info here:</SPAN><BR /><A href="http://resources.arcgis.com/en/help/main/10.2/index.html#//009t0000001s000000">http://resources.arcgis.com/en/help/main/10.2/index.html#//009t0000001s000000</A><SPAN> </SPAN><BR /><BR /><STRONG>Statistics (raster) functions</STRONG><BR /><SPAN>There is also the possibility to make use of focal statistics functions (on a single band data). In this case a �??virtual�?� new raster is created where each cell value will be the result of a standard deviation in a 3x3 or 5x5 moving windows. More info here:</SPAN><BR /><A href="http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000058000000">http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000058000000 </A><BR /><BR /><SPAN>In general more info on raster bands you�??ll find here:</SPAN><BR /><A href="http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000005000000">http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000005000000 </A><BR /><BR /><SPAN>Kind regards,</SPAN><BR /><BR /><SPAN>Xander</SPAN></BODY></HTML> Mon, 23 Sep 2013 13:03:16 GMT https://community.esri.com/t5/spatial-statistics-questions/can-some-one-explain-how-standard-deviation-is/m-p/510190#M1631 XanderBakker 2013-09-23T13:03:16Z