Memory-Efficient I/O-Improved Drainage Analysis System (MIDAS)

Predefined flow direction encodings in GeoTIFF: power2 (default, r.terraflow, ArcGIS), taudem (d8flowdir), 45degree (r.watershed), degree

Custom flow direction encoding is also possible by passing -e E,SE,S,SW,W,NW,N,NE (e.g., 1,8,7,6,5,4,3,2 for taudem).

Binaries for Windows

• MEFA (Memory-Efficient Flow Accumulation)
• MESHED (Memory-Efficient Watershed Delineation)
• MELFP (Memory-Efficient Longest Flow Path)
• MEFLEN (Memory-Efficient Flow Length)

Testing

git clone https://github.com/HuidaeCho/midas.git
cd midas\windows\test
pretest.bat
test.bat

Benchmark results

MEFA

System specifications

• CPU: Intel Core i9-12900 @ 2.40GHz
• Cores: 16
• Logical processors: 24
• Memory: 64 GiB
• OS: Windows 11

Citation

• Huidae Cho, July 2023. Memory-Efficient Flow Accumulation Using a Look-Aroun d Approach and Its OpenMP Parallelization. Environmental Modelling & Software 167, 105771. doi:10.1016/j.envsoft.2023.105771.

MESHED

MELFP

MEFLEN

System specifications

• CPU: Intel Core i9-12900 @ 2.40GHz
• Cores: 16
• Logical processors: 24
• Memory: 64 GiB
• OS: Windows 11
  • Downstream flow length (compute time only)
    • Texas results
      • 8.2 s (24 threads)
      • 19.6 s (1 thread)
    • CONUS results
      • 4.7 m (24 threads)
      • 7.3 m (1 thread)
• OS: Linux 6.6.30
  • Downstream flow length (compute time only)
    • Texas results
      • 9.4 s (24 threads)
      • 20.0 s (1 thread)
    • CONUS results
      • 2.0 m (24 threads)
      • 4.0 m (1 thread)