netcdf-c

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re: PR https://github.com/Unidata/netcdf-c/pull/3068 Part of splitting PR 3068 1. Libdap2+Libdap4: Update to change "_FillValue" to NC_FillValue constant. 2. Libdap4: Update the algorithm for sizing the packet buffer. 3. Libdap4: Dynamically...

DennisHeimbigner

`read` operations cause too many disk reads with unlimited dimensions

20

@lesserwhirls - the problem as far as I can tell exists in netcdf-java as well. This is a repeat of [this issue](https://github.com/Unidata/netcdf-fortran/issues/465) which can probably be closed in favor of...

haileyajohnson

Support scalars in Zarr

5

Quick patch for https://github.com/Unidata/netcdf-c/issues/3108. This PR relies on `.zarray` having `chunk` and `shape` keys that are empty arrays, also checking if `.zattrs` contains an empty array for `_ARRAY_DIMENSIONS`. Under this...

mannreis

DAP server error when trying to subset a variable

24

We are seeing an inconsistent NC_EDAPSVC error when trying read a subset from variables in [http://opendap.nccs.nasa.gov:80/dods/GEOS-5/fp/0.25_deg/assim/inst3_3d_asm_Np](https://url.us.m.mimecastprotect.com/s/e2ukCn5lVBTY5yEnI9frUJkjLn?domain=opendap.nccs.nasa.gov) file. For example, the error happens if trying to subset into the variable right...

krisfed

For static build, libraries are listed in wrong order

1

netCDF-c version 4.9.3 OS -- macos and linux were only ones tested When I build netCDF-c as a static only library, the generated dependent libraries in `nc-config` and `libnetcdf.settings` list...

gsjaardema

This is a draft on how one could test interoperability between netcdf and zarr-python on a systematic manner using python to create datasets to be using by netcdf and vice-versa....

mannreis

ncdump issues HTTP GET requests with headers that are too big (>8k bytes)

16

**Overview** Our good friends at NASA's GSFC are having trouble with data that they are serving (through Hyrax-1.16.3) and accessing said data with **_`ncdump`_**. The problem is that the web...

ndp-opendap

ncdump DAP4 response fails to handle the attribute name that contains special characters

4

When using "ncdump -h" to access the following file via DAP4 with dmrpp: http://test.opendap.org/opendap/GESDISC/S5P_NRTI_L2__O3_TCL_20250320T235705_20250324T222325_38546_03_020701_20250325T000000.nc It issues the following error(Note: the dmrpp after .nc): ``` ./ncdump -h dap4://test.opendap.org/opendap/GESDISC/S5P_NRTI_L2__O3_TCL_20250320T235705_20250324T222325_38546_03_020701_20250325T000000.nc.dmrpp (d4meta.c:410) ./ncdump: dap4://test.opendap.org/opendap/GESDISC/S5P_NRTI_L2__O3_TCL_20250320T235705_20250324T222325_38546_03_020701_20250325T000000.nc.dmrpp:...

kyang2014

Issue with ncdump and DAP4?

17

netcdf library version 4.9.0 of Mar 18 2025 16:42:02 $ Dataset URL: `http://test.opendap.org:8080/opendap/GESDISC/S5P_OFFL_L1B_IR_SIR_20180430T001950_20180430T020120_02818_01_010000_20180430T035011.nc.h5` Here's the ncdump interaction: ``` ncdump -h "dap4://test.opendap.org:8080/opendap/GESDISC/S5P_OFFL_L1B_IR_SIR_20180430T001950_20180430T020120_02818_01_010000_20180430T035011.nc.h5" (d4meta.c:499) Error:Inferred type name conflict ncdump: dap4://test.opendap.org:8080/opendap/GESDISC/S5P_OFFL_L1B_IR_SIR_20180430T001950_20180430T020120_02818_01_010000_20180430T035011.nc.h5: NetCDF: String...

ndp-opendap

Zarr scalars aren't not correctly handled

2

As an example here's some python code that writes a xarray dataset into netcdf and zarr (version 2): ```python import xarray as xr ds = xr.Dataset({'var':123456789}) ds.to_netcdf('xr.nc') ds.to_zarr('xr.zarr') ``` In...

mannreis