topic Re: How to create a percentile raster from .gdb containing multiple rasters? in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588627#M8547 <HTML><HEAD></HEAD><BODY><P>with numpy, there is np.nanpercentile which accounts for nodata cells</P><P><A href="https://community.esri.com/thread/208011">How to calculate the percentile for each cell from timeseries raster</A>&nbsp;</P><P>A raster stack (3D) can be easily created</P><P><A href="https://community.esri.com/blogs/dan_patterson/2018/02/06/cell-statistics-made-easy-raster-data-over-time">/blogs/dan_patterson/2018/02/06/cell-statistics-made-easy-raster-data-over-time</A>&nbsp;</P><P>and any statistic can be done.</P><P>If you have a ridiculously large data set, then it would be useful to split into chunks and read from a *.npy file using numpy memory management. &nbsp;</P><P>As for your questions, the tools to make the raster stack are given in your thread.</P><P>Rasters in a gdb are not really the preferred rasters, but if that is all you have, just make sure you specify an output raster as a tif in a folder.&nbsp; I would also np.save(…) your array in numpy format, they are very easy to work with for future work.</P></BODY></HTML> Mon, 11 Mar 2019 18:05:19 GMT DanPatterson_Retired 2019-03-11T18:05:19Z How to create a percentile raster from .gdb containing multiple rasters? https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588626#M8546 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I am trying to create a 5th and 95th percentile raster from a geodatabase containing multiple rasters (ranging from 26-60 rasters per .gdb).&nbsp; Essentially, I would like to perform the same function as cell stats (mean, max, median, etc) but calculating percentiles rather than simple stats.&nbsp; I've seen a few threads on this matter (this one in particular seems useful:&nbsp;<A href="https://community.esri.com/thread/168133">Pool of raster values to calculate percentile</A>)&nbsp;but none that seem to address how to do make an output percentile raster using rasters located in a .gdb.&nbsp; I haven't begun developing the code yet and wanted to solicit answers to these questions before beginning.&nbsp; A few questions:</P><P></P><P>1. Is there a tool that can do this or will I need to develop Python code using numpy?</P><P></P><P>2. Is it easier to do this with rasters located inside a folder or can I perform this calculation with rasters located in a .gdb?</P><P></P><P>Any help would be greatly appreciated.&nbsp; Thanks!</P></BODY></HTML> Mon, 11 Mar 2019 17:29:54 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588626#M8546 Anonymous User 2019-03-11T17:29:54Z Re: How to create a percentile raster from .gdb containing multiple rasters? https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588627#M8547 <HTML><HEAD></HEAD><BODY><P>with numpy, there is np.nanpercentile which accounts for nodata cells</P><P><A href="https://community.esri.com/thread/208011">How to calculate the percentile for each cell from timeseries raster</A>&nbsp;</P><P>A raster stack (3D) can be easily created</P><P><A href="https://community.esri.com/blogs/dan_patterson/2018/02/06/cell-statistics-made-easy-raster-data-over-time">/blogs/dan_patterson/2018/02/06/cell-statistics-made-easy-raster-data-over-time</A>&nbsp;</P><P>and any statistic can be done.</P><P>If you have a ridiculously large data set, then it would be useful to split into chunks and read from a *.npy file using numpy memory management. &nbsp;</P><P>As for your questions, the tools to make the raster stack are given in your thread.</P><P>Rasters in a gdb are not really the preferred rasters, but if that is all you have, just make sure you specify an output raster as a tif in a folder.&nbsp; I would also np.save(…) your array in numpy format, they are very easy to work with for future work.</P></BODY></HTML> Mon, 11 Mar 2019 18:05:19 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588627#M8547 DanPatterson_Retired 2019-03-11T18:05:19Z Re: How to create a percentile raster from .gdb containing multiple rasters? https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588628#M8548 <HTML><HEAD></HEAD><BODY><P>resolved? or still open?</P></BODY></HTML> Sun, 14 Apr 2019 12:37:41 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/how-to-create-a-percentile-raster-from-gdb/m-p/588628#M8548 DanPatterson_Retired 2019-04-14T12:37:41Z