A situation in which the density of artificial bridges to be corrected is low (as indicated in red in the figure below, road in green and river in white). In this case, the user should open the merged land cover, the road and the hydrographic network layers in a GIS software and:- Generate a buffer with a radius equivalent to 1.75 time the resolution of the original land cover grid (in light blue in figure b below);
- Put the hydrographic network layer in the editing mode and move the concerned segments outside of the buffer area as presented in c figure c below (highlighted blue line). You might also want to adjust the way the hydrographic network cuts the road network by placing them perpendicularly as also shown in c figure c below;
- Save your edits, import the new layer in AccessMod and run the merge land cover tool once again. The new resulting merged land cover should then look like presented in d figure d below.
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caption | Example of correction process operated on the hydrographic network with low density of artificial bridges with rivers showing up in white and roads showing up in green (see text above for explanations)2. A situation in which the density of vertex on the segments to be corrected is dense (indicated in red in
a below, road in green and river in white). In this case, open the merged land cover, the road and the hydrographic network layers in a GIS software and:- Generate a buffer with a radius equivalent to 1.75 time the resolution of the original land cover grid (in blue in b below)
- Put the hydrographic network layer in the editing mode and add a new river segment outside of the buffer area as presented in c below (light blue line)
- Save your edits and run the first module of AccessMod. The new resulting merged land cover should then look like presented in d below