https://community.esri.com/t5/arcgis-pro-questions/multidimensional-trend-time-unit-used-in-nedcdf/m-p/1134704#M50150 <P><STRONG>Solved using "trend" in CDO</STRONG> (<A href="https://code.mpimet.mpg.de/projects/cdo)" target="_blank" rel="noopener">https://code.mpimet.mpg.de/projects/cdo)</A>. Gives reasonable value in line with "manual" calculations. Even if multidimensional tools are nice and very computational effective (which CDO is as well) I find it tricky to keep track of time settings etc. And why can't TREND take normal multiband rasters files as input? The ARCMAP tool Curvefit (<A href="https://www.umesc.usgs.gov/management/dss/curve_fit.html)" target="_blank">https://www.umesc.usgs.gov/management/dss/curve_fit.html)</A> is excellent but slow for big data sets, the data set below ( <FONT face="courier new,courier">SUBDATASET_1_DESC=[20x19070x18091] Npp_500m (16-bit integer)</FONT> ) took a about 3 minutes to calculate the trend (gain, offset) with either CDO&nbsp; "Trend" or ARCGIS Pro "Multidimensional Trend", using the *.nc file as direct input. Interesting pattern in east Congo?</P><P>/Jonas Ardö</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Trend.png" style="width: 583px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/31736i15FCF88A962EFAD2/image-dimensions/583x821?v=v2" width="583" height="821" role="button" title="Trend.png" alt="Trend.png" /></span></P> Tue, 18 Jan 2022 19:23:19 GMT jonasardo 2022-01-18T19:23:19Z https://community.esri.com/t5/arcgis-pro-questions/multidimensional-trend-time-unit-used-in-nedcdf/m-p/1134435#M50112 <P>Using ArcGIS Pro 2.9.1 on windows 10 I imported a netcdf file to a Multidimensional Raster Layer. The data is a time series with one data set per year for 20 years (2001-2020). The original time dimension in the netcdf file is days&nbsp; When I calculate the trend using ArcGIS Pro (Multidimensional Trend) I get very small values and I suspect that Multidimensional Trend uses days instead of year as time unit. How can I correct that?</P><P><BR />Details in attached PDF, data attached.</P><P>Any suggestion appreciated</P><P>/Jonas Ardö</P> Tue, 18 Jan 2022 07:00:52 GMT https://community.esri.com/t5/arcgis-pro-questions/multidimensional-trend-time-unit-used-in-nedcdf/m-p/1134435#M50112 jonasardo 2022-01-18T07:00:52Z https://community.esri.com/t5/arcgis-pro-questions/multidimensional-trend-time-unit-used-in-nedcdf/m-p/1134704#M50150 <P><STRONG>Solved using "trend" in CDO</STRONG> (<A href="https://code.mpimet.mpg.de/projects/cdo)" target="_blank" rel="noopener">https://code.mpimet.mpg.de/projects/cdo)</A>. Gives reasonable value in line with "manual" calculations. Even if multidimensional tools are nice and very computational effective (which CDO is as well) I find it tricky to keep track of time settings etc. And why can't TREND take normal multiband rasters files as input? The ARCMAP tool Curvefit (<A href="https://www.umesc.usgs.gov/management/dss/curve_fit.html)" target="_blank">https://www.umesc.usgs.gov/management/dss/curve_fit.html)</A> is excellent but slow for big data sets, the data set below ( <FONT face="courier new,courier">SUBDATASET_1_DESC=[20x19070x18091] Npp_500m (16-bit integer)</FONT> ) took a about 3 minutes to calculate the trend (gain, offset) with either CDO&nbsp; "Trend" or ARCGIS Pro "Multidimensional Trend", using the *.nc file as direct input. Interesting pattern in east Congo?</P><P>/Jonas Ardö</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Trend.png" style="width: 583px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/31736i15FCF88A962EFAD2/image-dimensions/583x821?v=v2" width="583" height="821" role="button" title="Trend.png" alt="Trend.png" /></span></P> Tue, 18 Jan 2022 19:23:19 GMT https://community.esri.com/t5/arcgis-pro-questions/multidimensional-trend-time-unit-used-in-nedcdf/m-p/1134704#M50150 jonasardo 2022-01-18T19:23:19Z