Add openmesh (#6)

Add the OpenMesh dataset examples with OpenSense format, including wireless microwave links, personal weather station (PWS), and ASOS reference station example files, along with notebooks demonstrating data access and analysis with opensense packages.


* Add OpenMesh dataset with CML, PWS, and ASOS example files

- Add 1d, 1w, 20d sample files for CML, PWS, and ASOS
- Add notebooks: create, analyze, and ASOS processing
- Add openmesh_data_io.py and ws_opensense_conversion.py helpers
- Add README for OpenMesh folder
- Update main README with available datasets
- Gitignore notebooks/data/ (raw downloads, not tracked)
- Remove previously tracked data files from git

* Fix gitignore and remove tracked data/DS_Store files

* Fix notebook errors and save guard in analyze_OpenMesh_data.ipynb

- Cell 7: assign known ASOS station coordinates (lon/lat were NaN in .nc
  file due to ID mismatch between data short IDs and K-prefixed metadata)
- Cell 35: wrap interpolate_precipitation in try/except ValueError to
  handle pypwsqc bug with irregular time coordinates (shape mismatch)
- Cell 43: remove duplicate ASOS coord fix (now handled in cell 7)
- Cell 45: gate save logic under 'if save:' flag (was always executing)
- README: fix double space

* Fix ASOS station coordinates in openmesh_asos_ws_20d.nc

lon/lat/elev were all NaN due to ID mismatch between the short station
IDs used in the data (JFK, EWR, LGA, NYC) and the K-prefixed ICAO IDs
in the metadata CSV (KJFK, KEWR, KLGA, KNYC). Added correct coordinates
from known station locations.

* Fix ASOS variable names and update notebook execution timestamps

Rename precip_amount/precip_rate to rainfall_amount/rainfall_rate in
openmesh_asos_ws_20d.nc to follow OpenSense naming convention; add
long_name note that values may represent non-rainfall precipitation.

* Rename precip_amount/rate to rainfall_amount/rate in all notebooks

* Improve QC cell output and split baseline estimation into description, config, and implementation cells

Author: drorjac

.gitignore

@@ -1,4 +1,7 @@
 .ipynb_checkpoints
 OpenMRG/notebooks/data
 OpenRainER/notebooks/data
-*.pyc
+OpenMesh/notebooks/data
+*.pyc
+.DS_Store
+.idea/

OpenMesh/README.md

@@ -0,0 +1,69 @@
+# OpenMesh
+
+OpenMesh is a dataset of microwave link and personal weather station (PWS)
+measurements over New York City, covering January 2024. It also includes ASOS reference station
+data for validation. The raw data is sourced from two Zenodo records (jacoby_2025_OpenMesh).
+
+
+## Example files
+
+The root folder contains ready-to-use NetCDF sample files at three time windows.
+File names follow the convention: openmesh_{sensor}_{duration}.nc
+
+CML files (75 links, received signal level in dBm):
+  openmesh_cml_1d.nc       one day
+  openmesh_cml_1w.nc       one week
+  openmesh_cml_20d.nc      20 days
+
+PWS files (35 Weather Underground stations, rainfall, temperature, humidity, wind, pressure):
+  openmesh_wu_pws_1d.nc    one day
+  openmesh_wu_pws_1w.nc    one week
+  openmesh_wu_pws_20d.nc   20 days
+
+ASOS reference station files (airport weather stations, used for comparison and validation):
+  openmesh_asos_ws_20d.nc  20 days
+
+
+## Notebooks
+
+create_OpenMesh_data.ipynb
+  Downloads the raw CML and PWS data from Zenodo into notebooks/data/jacoby_2025_OpenMesh.
+  Generates sample NetCDF files for any time window using the functions in openmesh_data_io.py.
+  Also produces the root example files above. 
+
+analyze_OpenMesh_data.ipynb
+  Loads CML and PWS datasets either from the root example files or by creating them on the fly
+  from the raw data for a custom time window. Provides an overview of the dataset dimensions,
+  link/station metadata, and basic visualizations of signal level and weather variables.
+
+ASOS_opensense.ipynb
+  Downloads and processes ASOS airport station data (JFK, EWR, LGA) for the same time window
+  as the CML and PWS data. Converts the data to the opensense NetCDF format and saves it to
+  the samples folder. Used to generate the reference files for validation.
+
+
+## Helper modules
+
+openmesh_data_io.py
+  Central module for all data operations. Key functions:
+  - download_openmesh() and download_pws_wu(): download and extract Zenodo archives
+  - create_openmesh_sample() and create_pws_wu_sample(): slice a time window from raw data
+  - create_asos_sample(): fetch and convert ASOS data for a given time window
+  - create_all_datasets(): run all three in one call, with save and resample options
+  - load_cml() and load_pws_wu(): load the full raw source files into memory
+
+ws_opensense_conversion.py
+  Handles unit conversions and variable transformations for PWS data, converting raw
+  Weather Underground fields to the opensense standard format.
+
+
+## Data folder
+
+The raw downloaded data is stored in notebooks/data/jacoby_2025_OpenMesh and is not tracked
+by git. Running create_OpenMesh_data.ipynb will populate it automatically. The layout is:
+
+  raw/        full source NetCDF files downloaded from Zenodo
+  meta/       station and link metadata CSVs, and HTML map visualizations
+  archived/   original ZIP archives from Zenodo
+  examples/   example notebooks included in the Zenodo release
+  docs/       README from the Zenodo release