Hydrography90m layers

Here is an overview of all the current layers of the Hydrography90m dataset. Please see the paper by Amatulli et al. (2022) for further details.

For each computed layer is reported:

  • a figure sample
  • the layer file name with an asterisk which stands for the tile ID. The layer file name is a hyperlink that leads to the sub-directory download page
  • the visualization webgis link

Table of Contents

Tile map

Click below on the tiled map to get the download link or use the script here to dowloand the full data archive.
In case of downloading multiple tiles and you want merge them use the script here

Input layers

Input layers to derive the Hydrography90m: MERIT HYDRO DEM, depression. The MERIT HYDRO DEM can be directly download from the official MERIT HYDRO webpage The depression layer is stored at r.watershed archive folder directory.

Elevation
elv_*.tif



Depression
Depression areas not present in the study area.

Base layers

Base layers of Hydrography90m: flow accumulation, flow direction maps computed with the r.watershed GRASS GIS module. These files are stored in the r.watershed archive folder directory.

Flow accumulation
accumulation_*.tif



Flow direction




Network layers

Network layers of Hydrography90m: drainage basins, stream segments, subcatchments, outlets maps computed with the r.stream.extract GRASS GIS module. These files are stored in the r.watershed archive folder directory.

Drainage basin
Drainage basin



Stream segment
Stream segment



Sub-catchment
Sub-catchment



Outlet
Outlet



Stream slope layers

Stream slope of Hydrography90m: curvature, gradient (elevation difference divided by distance), and elevation difference raster maps computed with the r.stream.slope GRASS GIS module. These files are stored in the r.stream.slope archive folder.

Maximum curvature between highest upstream cell, focal cell and downstream cell
slope_curv_max_dw_cel_*.tif



Minimum curvature between lowest upstream cell, focal cell and downstream cell.
slope_curv_min_dw_cel_*.tif



Elevation difference between focal cell and downstream cell
slope_elv_dw_cel_*.tif



Focal cell gradient
slope_grad_dw_cel_*.tif



Stream distance layers

Stream/outlet distance of Hydrography90m: stream/outlet distance and elevation difference raster maps computed with the r.stream.distance GRASS GIS module. These files are stored in the r.stream.distance archive folder.

Shortest upstream distance between focal grid cell and the nearest sub-catchment drainage divide
Shortest upstream distance



Longest upstream distance between focal grid cell and the nearest sub-catchment drainage divide
Longest upstream distance



Distance between focal grid cell and its nearest downstream stream grid cell
stream_dist_dw_near_*.tif



****Distance between focal grid cell and the outlet grid cell in the network
outlet_dist_dw_basin_*.tif



Distance between focal grid cell and the downstream stream node grid cell
outlet_dist_dw_scatch_*.tif



Euclidean distance between focal grid cell and the stream network
stream_dist_proximity_*.tif



Elevation difference of the shortest path from focal grid cell to the sub-catchment drainage divide
stream_diff_up_near_*.tif



Elevation difference of the longest path from focal grid cell to the sub-catchment drainage divide
stream_diff_up_farth_*.tif



Elevation difference between focal grid cell and its nearest downstream stream pixel
stream_diff_dw_near_*.tif



Elevation difference between focal grid cell and the outlet grid cell in the network
outlet_diff_dw_basin_*.tif



Elevation difference between focal grid cell and the downstream stream node grid cell
outlet_diff_dw_scatch_*.tif



Stream segment properties layers

Stream segment properties of Hydrography90m: curvature, gradient (elevation difference divided by distance), and elevation change raster maps computed with the r.stream.channel GRASS GIS module. These files are stored in the r.stream.channel archive folder.

Segment downstream mean gradient between focal cell and the node/outlet
channel_grad_dw_seg_*.tif



Segment upstream mean gradient between focal cell and the init/node
channel_grad_up_seg_*.tif



Upstream gradient between focal cell and the next cell
channel_grad_up_cel_*.tif



Cell stream course curvature of the focal cell
channel_curv_cel_*.tif



Segment downstream elevation difference between focal cell and the node/outlet
channel_elv_dw_seg_*.tif



Segment upstream elevation difference between focal cell and the init/node
channel_elv_up_seg_*.tif



Upstream elevation difference between focal cell and the next cell
channel_elv_up_cel_*.tif



Downstream elevation difference between focal cell and the next cell
channel_elv_dw_cel_*.tif



Segment downstream distance between focal cell and the node/outlet
channel_dist_dw_seg_*.tif



Segment upstream distance between focal cell and the init/node
channel_dist_up_seg_*.tif



Upstream distance between focal cell and next cell
channel_dist_up_cel_*.tif



Stream order layers

Stream order of Hydrography90m: stream order raster and vector files computed with the r.stream.order GRASS GIS module. These files are stored in the r.stream.order archive folder.

Strahler’s stream order
stream_strahler_*.tif



Shreve’s stream magnitude
stream_shreve_*.tif



Horton’s stream order
stream_horton_*.tif



Hack’s stream order
stream_hack_*.tif



Topological dimension of streams
stream_topo_*.tif



All stream segments and nodes attributes




Flow index layers

Flow index of Hydrography90m: flow index computed using flow accumulation and terrain slope. These files are stored in the flow.index archive folder.

Stream power index
spi_*.tif



Stream transportation index (sti)
sti_*.tif



Compound topographic index
cti_*.tif