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Hi, This will run a little long, so thanks for bearing with me. I pulled down these 6 files: ftp://nomads.gfdl.noaa.gov/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly/tas_CLIVAR_atm_monthly.198204-198303.nc ftp://nomads.gfdl.noaa.gov/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly/tas_CLIVAR_atm_monthly.198304-198403.nc ftp://nomads.gfdl.noaa.gov/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly/tas_CLIVAR_atm_monthly.198404-198503.nc ftp://nomads.gfdl.noaa.gov/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly/zg_CLIVAR_atm_monthly.198204-198303.nc ftp://nomads.gfdl.noaa.gov/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly/zg_CLIVAR_atm_monthly.198304-198403.nc ftp://nomads.gfdl.noaa.gov/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly/zg_CLIVAR_atm_monthly.198404-198503.nc If I build the aggregation using this XML <?xml version="1.0"?> <catalog xmlns=" http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0"; xmlns:xlink="http://www.w3.org/1999/xlink"; name="CLIVAR Datasets"> <service name="ipcc" base="" serviceType="compound"> <service name="ipcc_odap" serviceType="OpenDAP" base="/thredds/dodsC/"/> <service name="wcs" serviceType="WCS" base="/thredds/wcs/"/> <service name="wms" serviceType="WMS" base="/thredds/wms/"/> <service name="ncss" serviceType="NetcdfSubset" base="/thredds/ncss/grid/"/> <service name="ncml" serviceType="NCML" base="/thredds/ncml/"/> <service name="uddc" serviceType="UDDC" base="/thredds/uddc/"/> <service name="iso" serviceType="ISO" base="/thredds/iso/"/> </service> <dataset name="GFDL CM2.1 Seasonal-Interannual Experimental Forecast"> <dataset name="CM2.1U_CDAef_v1.0_apf"> <dataset name="r1"> <dataset name="atmos"> <dataset ID="CM2.1U_CDAef_v1.0_apf r1 Atmosphere" name="CM2.1U_CDAef_v1.0_apf r1 Atmosphere" urlPath="CM2.1U_CDApf_v1.0_r1Atmos_wo_vars"> <dataType>Grid</dataType> <property name="viewer" value=" http://data1.gfdl.noaa.gov:8380/lasV7/getUI.do?data_url=http://data1.gfdl.noaa.gov:8380/thredds/dodsC/CM2.1U_CDApf_v1.0_r1Atmos, Visualize with Live Access Serve r"/> <serviceName>ipcc</serviceName> <netcdf xmlns=" http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation type="union"> <netcdf xmlns=" http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation dimName="time" type="joinExisting" timeUnitsChange="true"> <scan location="/home/users/rhs/clivar/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly" suffix="tas_*.nc"/> </aggregation> </netcdf> <netcdf xmlns=" http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation dimName="time" type="joinExisting" timeUnitsChange="true"> <scan location="/home/users/rhs/clivar/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly" suffix="zg_*.nc"/> </aggregation> </netcdf> </aggregation> </netcdf> </dataset> </dataset> </dataset> </dataset> </dataset> </catalog> I get a time axis and a time_bnds that looks like this: Dataset { Float64 time[time = 36]; Float64 time_bnds[time = 36][bnds = 2]; } CM2.1U_CDApf_v1.0_r1Atmos_wo_vars; --------------------------------------------- time[36] 28.0, 58.5, 89.0, 119.5, 150.5, 181.0, 211.5, 242.0, 272.5, 303.5, 333.0, 362.5, 393.0, 423.5, 454.0, 484.5, 515.5, 546.0, 576.5, 607.0, 637.5, 668.5, 698.5, 728.5, 759.0, 789.5, 820.0, 850.5, 881.5, 912.0, 942.5, 973.0, 1003.5, 1034.5, 1064.0, 1093.5 time_bnds[36][2] [0], 0.0, 30.0 [1], 30.0, 61.0 [2], 61.0, 91.0 [3], 91.0, 122.0 [4], 122.0, 153.0 [5], 153.0, 183.0 [6], 183.0, 214.0 [7], 214.0, 244.0 [8], 244.0, 275.0 [9], 275.0, 306.0 [10], 306.0, 334.0 [11], 334.0, 365.0 [12], 0.0, 30.0 [13], 30.0, 61.0 [14], 61.0, 91.0 [15], 91.0, 122.0 [16], 122.0, 153.0 [17], 153.0, 183.0 [18], 183.0, 214.0 [19], 214.0, 244.0 [20], 244.0, 275.0 [21], 275.0, 306.0 [22], 306.0, 335.0 [23], 335.0, 366.0 [24], 0.0, 30.0 [25], 30.0, 61.0 [26], 61.0, 91.0 [27], 91.0, 122.0 [28], 122.0, 153.0 [29], 153.0, 183.0 [30], 183.0, 214.0 [31], 214.0, 244.0 [32], 244.0, 275.0 [33], 275.0, 306.0 [34], 306.0, 334.0 [35], 334.0, 365.0 In each of the of the original files the time coordinate looks like this: time = 15, 45.5, 76, 106.5, 137.5, 168, 198.5, 229, 259.5, 290.5, 320, 349.5 ; So I would expect the aggregation time axis to start with 15. Based on some emails in the list archive, I'm pretty sure the time_bnds is a known issue. So the main questions how are the values for the time axis calculated? This is all being done with: Implementation-Vendor: UCAR/Unidata Implementation-Title: THREDDS Data Server (TDS) Implementation-Version: 4.3.20 And for completeness, I know I can get close to what I want by defining the time coordinate and time bounds myself, but it seems like a lot of extra work. <?xml version="1.0"?> <catalog xmlns=" http://www.unidata.ucar.edu/namespaces/thredds/InvCatalog/v1.0"; xmlns:xlink="http://www.w3.org/1999/xlink"; name="CLIVAR Datasets"> <service name="ipcc" base="" serviceType="compound"> <service name="ipcc_odap" serviceType="OpenDAP" base="/thredds/dodsC/"/> <service name="wcs" serviceType="WCS" base="/thredds/wcs/"/> <service name="wms" serviceType="WMS" base="/thredds/wms/"/> <service name="ncss" serviceType="NetcdfSubset" base="/thredds/ncss/grid/"/> <service name="ncml" serviceType="NCML" base="/thredds/ncml/"/> <service name="uddc" serviceType="UDDC" base="/thredds/uddc/"/> <service name="iso" serviceType="ISO" base="/thredds/iso/"/> </service> <dataset name="GFDL CM2.1 Seasonal-Interannual Experimental Forecast"> <dataset name="CM2.1U_CDAef_v1.0_apf"> <dataset name="r1"> <dataset name="atmos"> <dataset ID="CM2.1U_CDAef_v1.0_apf r1 Atmosphere" name="CM2.1U_CDAef_v1.0_apf r1 Atmosphere" urlPath="CM2.1U_CDApf_v1.0_r1Atmos"> <dataType>Grid</dataType> <property name="viewer" value=" http://data1.gfdl.noaa.gov:8380/lasV7/getUI.do?data_url=http://data1.gfdl.noaa.gov:8380/thredds/dodsC/CM2.1U_CDApf_v1.0_r1Atmos, Visualize with Live Access Serve r"/> <serviceName>ipcc</serviceName> <netcdf xmlns=" http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation type="union"> <netcdf xmlns=" http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <variable name="time" shape="time" type="float"> <attribute name="units" value="days since 1982-04-01 00:00:00"/> <attribute name="bounds" value="tbnds"/> <attribute name="_CoordinateAxisType" value="Time"/> <values start="15" increment="30.5"/> </variable> <variable name="time_bnds" shape="time bnds" type="float"> <values> 0 30 30 61 61 91 91 122 122 153 153 183 183 214 214 244 244 275 275 306 306 334 334 365 365 395 395 426 426 456 456 487 487 518 518 548 548 579 579 609 609 640 640 671 671 700 700 731 731 761 761 792 792 822 822 853 853 884 884 914 914 945 945 975 975 1006 1006 1037 1037 1065 1065 1096 </values> </variable> <aggregation dimName="time" type="joinExisting" timeUnitsChange="true"> <scan location="/home/users/rhs/clivar/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly" suffix="tas_*.nc"/> </aggregation> </netcdf> <netcdf xmlns=" http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <variable name="time" shape="time" type="float"> <attribute name="units" value="days since 1982-04-01 00:00:00"/> <attribute name="bounds" value="tbnds"/> <attribute name="_CoordinateAxisType" value="Time"/> <values start="15" increment="30.5"/> </variable> <variable name="time_bnds" shape="time bnds" type="float"> <values> 0 30 30 61 61 91 91 122 122 153 153 183 183 214 214 244 244 275 275 306 306 334 334 365 365 395 395 426 426 456 456 487 487 518 518 548 548 579 579 609 609 640 640 671 671 700 700 731 731 761 761 792 792 822 822 853 853 884 884 914 914 945 945 975 975 1006 1006 1037 1037 1065 1065 1096 </values> </variable> <aggregation dimName="time" type="joinExisting" timeUnitsChange="true"> <scan location="/home/users/rhs/clivar/gfdl_cm2_1/CM2.1U_CDAef_v1.0_apf/r1/pp/atmos/ts/monthly" suffix="zg_*.nc"/> </aggregation> </netcdf> </aggregation> </netcdf> </dataset> </dataset> </dataset> </dataset> </dataset> </catalog>
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