Differences

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--- fast_flow_accumulation [2020-07-04 11:54 pm] – [Table] hcho
+++ fast_flow_accumulation [2023-02-28 11:58 pm] (current) – hcho
@@ Line 17: / Line 17: @@
 | ''FastFlow Jiang fdr.tif fac.tif''                           |  304                  |  333         |
 | ''FastFlow BTI fdr.tif fac.tif''                             |  118                  |  144         |
-| TauDEM ''aread8 -p taud8.tif -ad8 tauad8.tif''               |  402                  |  606         |
+| TauDEM ''aread8 -p taud8.tif -ad8 tauad8.tif''               |  402                  |  607         |
-| TauDEM ''mpiexec -n 2 aread8 -p taud8.tif -ad8 tauad8.tif''  |                       |              |
+| TauDEM ''mpiexec -n 2 aread8 -p taud8.tif -ad8 tauad8.tif''  |  310                  |  514         |
 | ArcGIS Flow Accumulation                                     |                       |  478         |
 | Arc Hydro Flow Accumulation                                  |                       |  681         |
 | **Coming soon**                                              |  **48**               |  **107**     |
+| **Yet another coming soon**                                  |  **21**               |  **33**      |
+===== Results =====
+{{https://hcho.isnew.info/research/fig-fdr.png?400}}
+{{https://hcho.isnew.info/research/fig-benchmark-results-compute.png?400}}
+===== Discussion =====
+Too much overhead for raster I/O. Need to reimplement I/O using [[https://gdal.org/tutorials/raster_api_tut.html|GDAL]] or [[https://docs.fileformat.com/image/tiff/|from scratch]]? Done using GDAL.
 ===== References =====
   * [[http://skl.iswc.cas.cn/zhxw/xslw/201811/P020181116568187439544.pdf|A fast and simple algorithm for calculating flow accumulation matrices from raster digital elevation models]] (https://doi.org/10.1007/s11707-018-0725-9)
+  * [[https://gdal.org/tutorials/raster_api_tut.html|Raster API tutorial]]
+  * [[https://docs.fileformat.com/image/tiff/|TIFF - Image File Format]]
+  * [[https://medium.com/planet-stories/reading-a-single-tiff-pixel-without-any-tiff-tools-fcbd43d8bd24|Reading a Single TIFF Pixel Without Any TIFF Tools]]
+{{tag>projects}}