DEM notebook fails in headless environments: pds4_tools.view() requires Tkinter GUI

[jordanpadams]

🐛 Describe the bug

DEM_MapVisualization.ipynb calls pds4_tools.view() which requires Tkinter (a GUI library). This fails in any headless environment (CI, servers, macOS without a display) with ModuleNotFoundError: No module named '_tkinter'.

🕵️ Expected behavior

Notebook visualizes the DEM data without requiring a GUI window.

📜 To Reproduce

1. Install requirements-geo.txt
2. Run notebooks/discipline/geo/DEM_MapVisualization.ipynb
3. Cell calling pds4_tools.view(xml_urls[1][0]) raises ModuleNotFoundError: No module named '_tkinter'

⚙️ Fix

Replace the pds4_tools.view() GUI call with inline matplotlib rendering using pds4_tools.read() to load the data and then plot it directly. The viewer is convenient locally but incompatible with headless or CI execution.

🖥 Environment Info

• pds4-tools~=1.4, Python 3.13.1, macOS headless via nbmake