Zachary Hoppinen

Supplementary material to "Brief communication: First NISAR Interferometric snow water equivalent change retrieval evaluated against airborne lidar"

Zachary Hoppinen, Hans-Peter Marshall, Ross T. Palomaki, Coleman Kane et autres

S1 Candidate pairsThe NIVAL lidar flights were timed to coincide with NISAR ascending track 077 frame 024, so we drew candidate pairs from the operational interferograms on that track.Pairing each available 077 acquisition over Mores Creek Summit with its neighbor, and keeping …

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Brief communication: First NISAR Interferometric snow water equivalent change retrieval evaluated against airborne lidar

Zachary Hoppinen, Hans-Peter Marshall, Ross T. Palomaki, Coleman Kane et autres

Abstract. NISAR's global L-band repeat-pass interferometry should be sensitive to snow water equivalent change (ΔSWE). We compare ΔSWE from an operational NISAR interferogram to near-coincident airborne lidar snow-depth change over a February 2026 pair in southwest Idaho. Across the scene, ΔSWE correlates …

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Interferometric Synthetic Aperture Radar (InSAR) for Monitoring Seasonal Snow

Jack Tarricone, Ross T. Palomaki, Randall Bonnell, Zachary Hoppinen et autres

Abstract Interferometric Synthetic Aperture Radar (InSAR) offers a potential pathway for measuring seasonal snow water equivalent (SWE) and snow depth at spatial and temporal scales needed for basin‐scale hydrology. First proposed for seasonal snow more than 25 years ago, InSAR uses repeat‐pass …

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Using LIDAR and SNOTEL data for evaluating the performance of snow water equivalent retrieval using Sentinel-1 repeat-pass interferometry

Shadi Oveisgharan, E. Havazli, Robert Zinke, Zachary Hoppinen

Abstract. Accurate estimation of snow water equivalent (SWE) at high spatial and temporal resolution remains a critical challenge for hydrologic prediction and climate monitoring. Interferometric Synthetic Aperture Radar (InSAR) provides a promising approach for retrieving SWE by exploiting phase changes induced by …

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ASFHyP3/hyp3: HyP3 v10.17.6

Andrew Johnston, Jake Herrmann, Joseph H. Kennedy, James Rine et autres

Added Added RDS Connection Permission to the TaskRole. Added FIRE_TRACK job spec to hyp3-ak-fire-safe. Added parameter upload_to_db to AK_FIRE_SAFE job spec. Added environment variable DB_HOST to AK_FIRE_SAFE job spec. Changed Parquet file products are now visible. Sentinel-1D scenes are now accepted by …

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Automated workflows for airborne lidar and photogrammetry snow depth analyses

Naheem Adebisi, Joachim Meyer, Brenton A. Wilder, Hans-Peter Marshall et autres

Lidar and photogrammetry techniques provide highly accurate methods for mapping snow depth distribution. However, postprocessing point clouds for snow depth estimation is more complex compared to other earth science applications. This paper presents ice-road-copters (IRC), an open-source Python toolkit that facilitates processing …

Spicy Snow

Zachary Hoppinen, George Brencher, Ross T. Palomaki

Use Sentinel-1 volumetric scattering at C-band to retrieve snow depths.

A spatiotemporal analysis of errors in InSAR SWE measurements caused by non-snow phase changes

Ross T. Palomaki, Zachary Hoppinen, Hans‐Peter Marshall

Abstract. Spatially distributed measurements of snow water equivalent (SWE) in mountainous terrain are not currently feasible from existing satellite platforms. The NISAR satellite has the potential to provide high resolution (80 m) SWE measurements on a 12-day orbit cycle over many of …

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Spicy Snow

Zachary Hoppinen, George Brencher, Ross T. Palomaki

Use Sentinel-1 volumetric scattering at C-band to retrieve snow depths.

Spicy Snow

Zachary Hoppinen, George Brencher, Ross T. Palomaki

Use Sentinel-1 volumetric scattering at C-band to retrieve snow depths.

rpalomaki/SWE_error_analysis: manuscript

Ross T. Palomaki, Zachary Hoppinen

Initial release for published manuscript

rpalomaki/SWE_error_analysis: manuscript

Ross T. Palomaki, Zachary Hoppinen

Initial release for published manuscript