topic Random Sampling of Satellite Image pixels in Data Management Questions https://community.esri.com/t5/data-management-questions/random-sampling-of-satellite-image-pixels/m-p/178511#M10075 <HTML><HEAD></HEAD><BODY><P>Is there a way I can sample random raster pixels with a minimum distance from a satellite image? I need each randomly-chosen pixel to have a pre-defined minimum distance in order to minimize spatial autocorrelation, and I would be sampling from the near infrared band. I also need to output the sampled pixels into a new raster .tif file. Is there a way to do this in ArcGIS, ArcPy/Arc toolbox or even Python?&nbsp; Thanks.</P></BODY></HTML> Tue, 29 Jan 2019 06:26:49 GMT J_L_ 2019-01-29T06:26:49Z Random Sampling of Satellite Image pixels https://community.esri.com/t5/data-management-questions/random-sampling-of-satellite-image-pixels/m-p/178511#M10075 <HTML><HEAD></HEAD><BODY><P>Is there a way I can sample random raster pixels with a minimum distance from a satellite image? I need each randomly-chosen pixel to have a pre-defined minimum distance in order to minimize spatial autocorrelation, and I would be sampling from the near infrared band. I also need to output the sampled pixels into a new raster .tif file. Is there a way to do this in ArcGIS, ArcPy/Arc toolbox or even Python?&nbsp; Thanks.</P></BODY></HTML> Tue, 29 Jan 2019 06:26:49 GMT https://community.esri.com/t5/data-management-questions/random-sampling-of-satellite-image-pixels/m-p/178511#M10075 J_L_ 2019-01-29T06:26:49Z Re: Random Sampling of Satellite Image pixels https://community.esri.com/t5/data-management-questions/random-sampling-of-satellite-image-pixels/m-p/178512#M10076 <HTML><HEAD></HEAD><BODY><P><A _jive_internal="true" href="https://community.esri.com/blogs/dan_patterson/2018/12/30/point-tools">Spaced points in Point Tools</A> then perhaps</P><P></P><P><A class="link-titled" href="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/extract-by-points.htm" title="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/extract-by-points.htm">Extract by Points—Help | ArcGIS Desktop</A>&nbsp;</P><P><A class="link-titled" href="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/extract-values-to-points.htm" title="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/extract-values-to-points.htm">Extract Values to Points—Help | ArcGIS Desktop</A>&nbsp;</P><P><A class="link-titled" href="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/extract-multi-values-to-points.htm" title="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/extract-multi-values-to-points.htm">Extract Multi Values to Points—Help | ArcGIS Desktop</A> or</P><P><A class="link-titled" href="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/c-extracting-cell-values-to-point-features.htm" title="http://pro.arcgis.com/en/pro-app/tool-reference/spatial-analyst/c-extracting-cell-values-to-point-features.htm">Extracting cell values to point features—Help | ArcGIS Desktop</A> (maybe best?)</P><P>You could use arcpy.da.RasterToNumPyArray to spit out your raster layer I suppose then do the sampling from there</P></BODY></HTML> Tue, 29 Jan 2019 11:06:44 GMT https://community.esri.com/t5/data-management-questions/random-sampling-of-satellite-image-pixels/m-p/178512#M10076 DanPatterson_Retired 2019-01-29T11:06:44Z