Cdo regrid. The operators include simple statistical and arithmetic functions, data selection and subsampling tools, and spatial interpolation. nc infile. PopLatLonV, ESMF_regrid. The netCDF files say the data format is F32. There shouldn't be any! Robert should get credit for this answer too as I couldn't remember the gridboxmean command exactly, his comment reminded me. ysize = 480. I tried CDO, and also ncremap, but did not work. Each input file contains the same variables for a different time period. For regridding categorical data to a finer resolution, please use "nearest-neighbor" regridder. 5 grid to a 0. 1 deg) and plotting on the basemap using matplotlib. The following methods are supported: Note that "Most common value" is designed to regrid categorical data to a coarse resolution. With xarray-regrid it is possible to regrid between two rectilinear grids. In most cases, 'bilinear' should be good enough. 6. nc outfile. CDO was developed to have the same set of processing functions for GRIB [ GRIB How to regrid population data (total not density) Added by Alexander Killick almost 3 years ago. 7. Then, I want to remap it to be usual coordinate. 05 degree PFT file, so that I have high resolution LAI data. cdo -remapcon,EUR-11_grid. 5 grid of a 3d matrix ("air"). Warning (cdfScanVarAttr): NetCDF: Variable not found - >XLAT_U<. [pmdtest@pmd CRU]$ cdo sinfov GLOBAL_CRU_CTL_CRU-TS31_MM_0. You can change the grid resolution and extent of the input data to a different grid resolution. Hello, I am currently attempting to get two datasets (different variables) on the same grid and possibly merging them into a single file. % this function makes 360 columns and 180 rows based on the lon and lat of your input file. I had already tried with remaplaf, but Apr 3, 2017 · Note that creating a map file is useful even if you don't want to regrid the data to a rectililinear grid. nc") cdo_path = '/opt/local/bin/cdo'. Apr 14, 2021 · This video outlines four main methods to remap or interpolate gridded datasets in netcdf or grib format:- nearest neighbour interpolation- bilinear interpola Popular options include CDO (Climate Data Operators) and NCO (NetCDF Operators). The dimensions in the netCDF file will be named "latitude" and "longitude". nc), it does not map Ireland correctly to the new grid and maps it to the wrong location (see ncview_cosmo Working with CDO . Aug 27, 2018 · I need to regrid hundreds of netCDF files but when I used the CDO command in R, there is always a problem like this: cdo remapnn (Abort): Too few streams specified! Operator needs 1 input and 1 output streams. Replies (5) RE: regrid never completeshelp - Added by Jaison-Thomas Ambadan about 12 years ago. Unfortunately this won't help you, because the function uv2dv needs the input data on a global Gaussian grid. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. nc B_regrid. 04167 -d lat,41. 1. nc Share. Here is the code for bilinear interpolation to (say) Gaussian N32. Now you can use the newly generated custom weights file custom_weights. nc cdo setgrid,targetgrid. If you and your team are looking for high-quality, standardized nationwide parcel data, then reach out to our team at parcels@regrid. Thus, one can regrid all data (in a regular or irregular grid) to a regular grid with coordinate information. 9. However, there is also a suite of tools called NCO, which stands for netCDF Operators. There are numerous grid interpolation methods and users should choose the method appropriate for Nov 23, 2020 · I have two . regrids ¶. 0,83. 5 by 0. Using the NetCDF module, declare the dimensions, variables, and necessary metadata for your regridded dataset. Jul 21, 2023 · I am trying remap interpolation using cdo by: cdo remapbil,black_sea. 2) script to compute non-linear trends and a few CDO (version 1. That's a mistake during file creation. nc. from 144 x 73 x 72 -to- 721 x 361 x 72. I tried. The result is that, sometimes, there are small gaps in the interpolated grids. data (data object) – Input data to be regridded. regrid_2. I have a population grid of 1/8th * 1/8th degree which displays total population per grid square, I want to change this to a 1. 0,-52. My own solution was to 1) regrid the global netCDF file with the following command: cdo remapbil r4320,2160 B. But, the resultant netCDF have values from -300 to 300. Hi Erik, I couldn't reproduce the problem; for me it worked fine! Here is the command sequence that I used: 1. ¶. # For some (strange) reason, grib_set converts it to hybrid coordinates but keeps level index, the file you uploaded ( gom_lwrad_era1. grb. The menu Data Preparation ‣ Regrid Spatial Data allows to perform a spatial regridding of netCDF datasets. cdo, which we then regrid to, either on the fly or delivered with the tool. 5 degree LAI file into 0. Aug 30, 2021 · I want to regrid population data from 0. I want to regrid the file to a half degree grid but I can't set the grid to lonlat. Aug 28, 2014 · If you regrid your data to a coarser lat/lon grid using e. 45833 B_regrid. There might reasons for you to use in R only . cdo griddes infile. ncdump gom_lwrad_era1. In some cases, edge points may not Regrid the data Use the regridding utility provided in this repository to convert the 2-dimensional latitude and longitude grid to a regular (rectilinear) grid where latitude and longitude are 1-dimensional. 7; eastlimit=69. 4 the grid information among others depending on the rotated pole can be retrieved using. txt that can then be used to regrid not just this ERA5 temperature netCDF but all ERA5 data on this grid. nc B_regrid_subset. Create an interpolation function trained on your original data f(ψ1,ϕ1) f ( ψ 1, ϕ 1) for the data you will regrid. nc where grid. nc" For all other identically gridded ERA5 data (e. 0-beta), this function will return type float if data is float, and double if data is double or the special "ReturnDouble" attribute is set to True (see below). However, I met following warning and an error: Warning (cdfScanVarAttr): NetCDF: Variable not found - >XLONG_U<. nc . The model grid is not straightforward as far as I can see, and needs to be put in 'CDO grid' (manual section 1. nc Jun 5, 2019 · I can dive into that if necessary. txt', but I still got the problem: I have a high-resolution variable (0. The option you need is remapdis, if the file is global you can simply specify the resolution using the regular grid specifier, for example with a 1x1 degree grid: cdo remapdist,r360x180 precip Nov 7, 2021 · 1. GEOS-Chem uses the regridding software MAP_A2A from S-J Lin. Feb 9, 2023 · 0. You can use the CDO operator sinfo or griddes to check the grid information of the source grid. I can seemingly do that using cdo remapcon using the commands below, However it doesn't produce quite what I expected. nc) is 63MB. This function requires that following libraries be loaded prior to invoking the function: Perform regridding. The xESMF Regridder features the parameter ignore_degenerate to deal with collapsing cells, but when using the patch or conservative methods, the halo would still distort the results, since the halo cells are added up. When I do this, the output file "remap1. My aim is to use the time-varying biomes labelled 16 and 17 to extract fgco2 values from the observational data. #/bin/sh # Run these commands to regrid the CMIP5 data using the Climate Data Operators (CDO) # The script will convert the grids to rectangular 0-360 and -90-90. Examples. Dec 3, 2019 · You can use cdo in the following way. Hi all, Has anyone successfully regrided WRF output files into a normal regular grid with CDO or NCL or other resources? Any help would be appreciated. nc (Note that occasionally you may find CDO throwing a wobbly due to loss of precision during the conversion if the data is "packed" and in this case it will suggest you use the option "-b f32" or "-b f64". Apr 10, 2017 · However, if you a very simple one liner, you can can do inverse distance weighting remapping of netcdf files by simply calling CDO with a system command. Compress a netCDF file. May 12, 2020 · I am trying to regrid the data (file attached "air") from a 2. Oct 26, 2020 · Open the original dataset. I tried to do that using: cdo remapcon,r1440x720 a. 84s 932MB]. Make a regridder by xe. RE: Remapping data without interpolation - Added by Anna marra over 6 years ago. if resample 1deg map from 4by5 map, by default the center is -89. The air variable is characterized as lon x lat x time (144 x 73 x 72). nc with just extended domain area and values will be as original in small area and extended value of the area would be 0. nc input_file. 832 to -114. 1118 degree, and lon range from -116. nc > targetgrid. Regrid is the leading provider of land parcels & location context data for your maps, apps & spatial analysis. I want to regrid using remapcon the data in SAFRAN_PR_19890101net3. I've been trying some commands from ncremap, but nothing is working. answered Jul 14, 2020 at 18:36. nc -setgrid,grid_corners_SAFRAN. I used CDO to regrid my NetCDF file after that I used my outputs in R. grid_mapping_name = rotated_latitude_longitude. 1 degrees. I need to regrid it to a similar resolution domain, covering similar area, but in regular lat-lon grid. cdo setgrid,grid. However, one of the files actually has data values that are outside the maximum range accepted by F32. ncl " example on the original regridding examples page, which uses the linint2 function to do the regridding. Improve this answer. sh. bilinear interpolation, this will result in a smoother field. Jan 13, 2014 · Regridding is the process of interpolating from one grid resolution to a different grid resolution. nc files: zmksrf_lai. References. Thanks, Simon Jul 13, 2023 · The MAP_A2A algorithm. I have data downloaded from Cordex project with domain EUR-11 with rotated coordinate. nc where newgrid. Please help me to regrid one or both at same grids. xarray-regrid: Regridding utilities for xarray. 5x0. However, when I now try to regrid WRF (wrf_output. Contribute to IsaakBM/CDO-climate-data-operators- development by creating an account on GitHub. Many of these commands utilize the nco and cdo utilities. files(path = common_path,pattern = ". i. regrids. 1 x . I compared files using a text version printing all data with vimdiff. ncl - uses an existing weights file and does the regridding with a call to ESMF_regrid_with_weights This example was taken from the " regrid_1. Example: the actual interpolation is conducted using g2gsh_Wrap, a wrapper function that will assign all the appropriate meta data, including the gaussian latitudes, to resulting output. nc (attached). 75 and edge is -89. ESMF_regrid_with_weights regrids data from a source grid to a destination grid, using weights stored in the wgtFile NetCDF file. wgrib2 data_halfdeg. RE: Regrid error: Unsupported generic coordinates - Added by Estanislao Gavilan almost 2 years ago I think it is because cdo cannot find the variables XLONG_U, XLAT_U and XTIME that appear in the coordinate attributes I am trying to regrid Time_Varying_Biomes. 875 * 1. and then 2) spatial subsetting (or CDO equivalent): ncks -d lon,-141. RE: Divergence / Vorticity (uv2dv problem) - Added by Uwe Schulzweida over 3 years ago. 05 degrees) with values between 0 to 100. Added by Haochen Tan almost 2 years ago. We would like to show you a description here but the site won’t allow us. Feb 6, 2011 · a datafile that used the target grid - CDO will read the grid from it and use it; In you case (Europe only), you might use this eastlimit=-10. Here is an example: cdo remapnn,eragrid -setgrid,<gridfile> icon. 5; If you desire to define the edges exactly as you need (eg. A example 2D field that is already in the right format, is also attached (INPDUST_mhw. Warning (find_time_vars): Time variable >time< not found! and. If I do, e. It shouldn't be trying to allocate that much RAM. Sep 23, 2023 · In some cases, it may be necessary to regrid NetCDF files to a specific template or resolution for further analysis or model integration. The CDO are implementated from the unix/linux command line. Firstly I use this : cat > EUR11-grid << EOR. I compared both files with CDO: no differences. This article explores the process of regridding NetCDF files to a desired template resolution, focusing on its relevance in WRF chemistry and earth science. I have tried to do it using NCL ( rcm2rgrid_Wrap function), but it is doing a bad job in the center of the domain. txt', but I still got the problem: I need to regrid a 2D field (128x64 lonxlat for 12 time steps) to a model grid (180x193 lonxlat), which are both attached to this message. nc remap1. nc File format: netCDF-1 : Institut Source Name Time Typ Grid Size Num Levels Num 1 : unknown unknown pr var F32 259200 1 1 1 Horizontal grids : {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"DATA","path":"DATA","contentType":"directory"},{"name":"RESULT","path":"RESULT","contentType For more robust regridding, see the ESMF regridding examples, which show how to regrid data from and to rectilinear, curvilinear, or unstructured grids. Then check the differences. The -new_grid option interpolates the fields to a new grid. ncl - does the regridding in a single call to ESMF_regrid ESMF_wgts_1. Looking at the Horizontal grids section of the CDO documentation, it seems that we have to create the ASCII grid description file of the WRF (i. Below are several useful commands for editing netCDF files. nc #for regridding. GRIB2 files come without coordinates of the horizontal grid. Nov 4, 2021 · The code consists of an NCL (version 6. gridtype = lonlat. cdo -f nc -sellonlatbox,-35,35,-20,35 -random,r360x180 template. nc is on a generic grid that cdo does not Sep 14, 2017 · Then, you can convert the regridded file to netCDF with. $ ncdump -cts file. You have to add these information in order to use the interpolation functions in CDO. 0. the code is as follows: files <- list. There are two possible ways to do this: Manually create the file, including the corners. MAP_A2A is an area-preserving mapping scheme. These tools can help prepare models for submissions by enabling the user to add/remove/change variables, attributes etc. -Karin. cdo remapbil,n32 infile. eg. Try to use the griddes operator, as cdo griddes INFILE. csv cordex. txt is the grid information of the original file and lonlat set to the grid type instead of curvilinear. The input file contains regional data. nc out_bs_mask. 5 by 2. nc also 63MB. nc ofile. See Also. Display the header and coordinate variables of a netCDF file, with the time variable displayed in human-readable format. I have a question regarding the remapping data. In forum, I have read cdo setvals and cdo setgridcell,value= etc used for specific values replacement and for specific points. Feb 29, 2024 · xarray-regrid: Regridding utilities for xarray. nc output. I wonder if I could do this regrid in nco. nc contains the grid corner lats and lons. cdo remapbil,rotRegGrid. It comes from Climate Data Operator (CDO). For GRIB files you have to change the code numbers: cdo uv2dv -chcode,165,131,166,132 -setgridtype,regular uv_N320. For a specific reason I would like to Hei, I'm working with the AWI-CM-1-1-MR data on the DKRZ server (CMIP6: historical r1 until r3). com to get the conversation started. Example HH_local_emission_regrid. It has the variable named Band1, which has 3d dimension (time, lat, lon). nc, and zmksrf_pft. I want to interpolate the 0. Because it is population, I should aggregate (sum) population values for resampling data to a coarser resolution. I need to regrid the variable Band1 I failed to regrid this data, so I tried to add the coordinates and missing_value following the suggestion by Ralf: cdo -setattribute,sithick@coordinates = "clat clon",sithick@missing_value = 9999. You can add the grid coordinates with the CDO operator setgrid. The problem is the final grid product does not exactly align with the target netCDF Regrid Spatial Data. txt CCRC_NARCliM_01H_1990-1990_pracc. I'm using cdo to regrid ERA5 data from regular grids to polar stereographic grids. nc output_file. If the result is not correct or there is no grid information available (gridtype: generic) then you also have to define the source grid with setgrid: cdo remapbil,targetgrid -setgrid,souregrid ifile ofile One has to regrid all data (model and reanalysis) into a common resolution before the computation of statistical metrics. nc > gridfile. Ocean and sea-ice data from the AWI Climate Model (AWI-CM) and AWI Earth System Model (AWI-ESM) for CMIP6 Regridding two files. 5 Regridding with CDO. nc Then I regrid 't. 5). grid_north_pole_latitude = 39. can be used to do: "cdo remapbil,grid. md","contentType":"file"},{"name":"gridfile_0. -1 : Institut Source Ttype Levels Num Gridsize Num Dtype : Parameter name. nc as attached with 411 lon and 361 lat grids, lat range from 32. grb -netcdf data_halfdeg. Return the field regridded onto a new latitude-longitude grid. e. g. As of V6. My issue is that the Time_Varying_Biomes. It is also not clear to me how time series of variables are handled. nc). 2. nc but I'm receiving the message: Warning (cdf_read_ycoord): Unsupported array structure, skipped variable thkcello! problem regridding using a destination grid. txt. nc out. for the target grid (0. . nc I got this error: remapbil (Abort): Unsupported target grid type (generic)! I guess cdo does not handle with generic type. nc SAFRAN_PR_19890101net3. grid is just an xarray Dataset containing lat and lon values. Also show status of file compression and/or chunking. An example netCDF file is attached represent 1 month of daily data for total precipitation. nc > gom_lwrad_era1. Thanks, Simon I'm using cdo to regrid ERA5 data from regular grids to polar stereographic grids. 0) scripts to regrid data and correct CMIP6 data biases. ) Common regridding options to consider are: remapbil: Bilinear interpolation The CDO operator verifygrid is very useful in detecting duplicated and collapsing cells. if it is precipitation, or temperature, this is irrespective). Your suggestion is highly appreciated. variable T,U and V on the levels 200, 500 and 850 from all 3 input files, use: cdo -select,name=T,U,V,level=200,500,850 infile1 infile2 infile3 outfile. For example, if you have a quantity such as kg/m2/s or W/m2, MAP_A2A will multiply by the area on the input grid, then regrid, and divide by the area on the output grid, such that the total quantity is preserved. 25 degree population grid with total population per grid square. To select the. I'm trying to regrid the variable thkcello using CDO: cdo remapycon,global_1 thkcello_Ofx_AWI-CM-1-1-MR_historical_r1i1p1f1_gn. Oct 22, 2015 · Edit: I have been reading some pages and I found a function called remapbil. comto get the conversation started. Parameters. This could involve temporal, vertical or spatial ('horizontal') interpolations. In order for the vector interpolation to work, the vector quantities must be in a (U,V) order. Defining the WRF grid for CDO ¶. Oct 5, 2019 · cf. Hi Karin, thank you very much for your answer. For example, generate a weight file that will conservatively regrid the POP data to (say) a 1x2 grid. To remap / convert from the native grid to a generic cartesian grid use the CDO command remap used in teh script remapCMIP6. Select the format of the input data to regrid. Nov 2, 2018 · We would like to show you a description here but the site won’t allow us. 125. The default interpolation is bilinear but that can be changed using the -new_grid_interpolation option. For other methods see Comparison of 5 regridding algorithms. txt input. md","path":"README. If your application is anticipating "lat" and "lon", you can rename these with the NetCDF operators: ncrename -dlatitude,lat -dlongitude,lon \. xsize = 1000. This option uses scalar and vector interpolation as appropriate. grb dv. 25. This is my netCDF file info: File format: netCDF. nctoolkit will generate the appropriate CDO grid file and commands for you. 0 and later. The Climate Data Operator ( CDO) software is a collection of many operators for standard processing of climate and forecast model data. If you still think of regridding using CDO. How to use remapcon. Regrid error: Unsupported generic coordinates. Additionally, many GIS packages such as ArcGIS, QGIS, and GRASS also have the ability to regrid (remap) NetCDF ESMF_regrid_1. Apr 27, 2023 · cdo remapbil (Abort): Unsupported generic coordinates (Variable: DN)! I suppose the root cause lies in WRF netCDF incompatibilities with CF Convention ; and I don't know if there's anything to do ? Thank you to enlighten me on that matter if you have any information. 0 (not V6. nc test. I also attempted using weights for the remapping. 0, any interior points not interpolated in the initial interpolation pass will be filled using linear interpolation. The plot I am trying to do is contour lines. nc sic_sub. Retrieve the grid description from the input file and make some changes. I tried to do the regrid but it did not work. As you continue your tour, you'll see exactly the commands that control Ferret. cdo remaplaf,targetgrid infile outfile. The commands will be in capital letters; FERRET prompts for input with the word "yes?" The images shown are drawn using PyFerret. The easy to implement option would be an empty master grid from, e. 984 over California. Feb 25, 2020 · This tour will introduce the basic capabilities of the FERRET program through examples. nc can be any file which has the target grid and input_file is the file which is to be regridded. Figure modified from Danilov 2013 “Ocean modeling on unstructured meshes”. 25 degree) and mask the ocean features to NaN. I assume this is the correct gridfile. See the section Creating and congfiguring a map file for better zooming, below. So I wanted to change the longitude and latitude resolution without affecting the time variable i. nc onto the CORDEX EUR-11 grid using the command. I failed to regrid this data, so I tried to add the coordinates and missing_value following the suggestion by Ralf: cdo -setattribute,sithick@coordinates = "clat clon",sithick@missing_value = 9999. nc to regrid the icon sample file: Regrid the input data object so that its grid matches the reference data grid. Jul 1, 2022 · I want to regrid it to a structured long/lat grid at 0. Available in version 6. Here is a Ferret script to define a rectilinear grid and compute the mapping function to regrid a curvilinear grid to it. txt","path can be used to do: "cdo remapbil,grid. 4; northlimit=72. Based on CDO commands,this uses griddes to retrieve the grid from the reference data and remap to remap the input data based on the reference grid. This is causing problems in CDO when nctoolkit calls it. I processed it with cdo -sorttimestamp to a new file gom_lwrad_era1-sorted. nc) and COSMO output (cosmo_output. RE: Regarding Regridding/ Mapping - Added by Karin Meier-Fleischer over 4 years ago. . This problem appears to be caused by issues in the raw data. dump. regrid netcdf data to finer resolution in python. Thank you. mask. 1. The NCAR ClimateData guide has a nice introduction to regridding (general, not Python-specific). cf. You could try solving this with nctoolkit, which uses CDO as a backend: If your file is 2 GB, then presumably you have made a mistake with the grid file in your CDO example. In FESOM, the polygons around each node (triangular vertex) are composed not only by the adjacent triangular centroids but also by the edge medians in between. To remap this to another grid you need a grid description file. However, most commonly, regridding refers to spatial interpolation. The simple search algorithm used by rcm2rgrid is not capable of handling all cases. Field. The regridding method must be specified. Although I thought that there going to be a simple answer to this question, I did find any yet. Jul 14, 2020 · 0. nc' on the grid 'outgrid1. May 14, 2016 · I have a netcdf file with high resolution grided data (. Description. cdo griddes RF_1901_2016. Unlock tools, layers, and more with a Regrid Pro account. where grid_corners_SAFRAN. cdo remapbil, sic_inverted1. nc (attached) to the same grid type and resolution as the observation dataset fgco2_obs. 0. Regridder(grid_in, grid_out, method). 9 PIOMAS1979. nc the input and output files are exactly the same, as expected, so the target grid definition seems to be ok. Delete first timestep in file: cdo -delete,timestep=1 infile outfile. 8; southlimit=35. Important to note this is total population per Jun 2, 2021 · cdo griddes infile. I want to remap it to a lower resolution (0. nc t. Dec 19, 2022 · The way to test the behaviour is to 1) regrid using boxmean to a coarser grid, and then 2) regrid to that coarser grid using remapcon. by default, can run: $ cdo remapcon,r360x180 ifile ofile. If you want to regrid and interpolate a netCDF file with CDO, the easiest way (for me!) is to create a standard grid file with the argument griddes. cdo remapcon,newgrid. But I couldn't remap this "generic" grid to a lonlat. , target) grid ourselves. A better implementation would require a solution based on a regridding function. Instead of 6 points in a sea of missing values (which is what I want), I get a swath of nonzero points surrounding the 6 locations and the actual points you can use the remaplaf operator - 'The result of remaplaf is the index with the largest area fraction for each target grid cell'. 5), then cdo remapcon,r720x360 in. This gives CDO is a suite of tools that enables the regridding of datasets as mentioned above. 3. Regridding, also called remapping or interpolation, is the process of changing the grid underneath field data values while preserving the qualities of the original data. -90 on left edge, center point be -89. 25deg resolution. create the target grid with (set the resolution with the parameter of topo) cdo -sellonlatbox,-11,70,35,75 -topo,global_2 targetEuropeGrid. The rotated pole grid information variables are not xnpole and ynpole, but you get. 5deg_1971-2000_pr. 4905 to 34. nc" does not display anything in ncview. grid_mapping = rotated_pole. Added by Fredrik Boberg almost 7 years ago. Available data formats are: One NetCDF file, Multiple NetCDF files or CDT Regrid’s data spans all industries needing land insight. regridll : regrid an object to a lat-lon box of a CDO regular grid cdo gennn: Nearest neighbor weights from unstructured (2949120) to lonlat (601x301) grid cdo gennn: Processed 6 variables over 1 timestep [22. I have a netcdf file LAI_2020_all_lambert. Use your interpolation function, so you get y2 = f(ψ2,ϕ2) y 2 = f ( ψ 2, ϕ 2). Dear all, I was trying to regrid the data that I have from WRF outputs. Beginning with NCL version 6. 05 degrees to 0. ncl: An example of using g2gsh, which interpolates from one gaussian grid to another using spherical harmonics. So, I tried to edit the mask file with "ncatted". Below is the info of the two files. wj lp fg mv if oa gv sx th zo