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Adding a DOI to the slope citation. #398

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Jun 25, 2024
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5 changes: 3 additions & 2 deletions src/pygeoprocessing/geoprocessing_core.pyx
Original file line number Diff line number Diff line change
Expand Up @@ -300,8 +300,9 @@ def calculate_slope(
"""Create a percent slope raster from DEM raster.

Base algorithm is from Zevenbergen & Thorne "Quantitative Analysis of Land
Surface Topography" 1987 although it has been modified to include the
diagonal pixels by classic finite difference analysis.
Surface Topography" 1987 (https://doi.org/10.1002/esp.3290120107) although
it has been modified to include the diagonal pixels by classic finite
difference analysis.

For the following notation, we define each pixel's DEM value by a letter
with this spatial scheme::
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