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The merged land cover grid is typically constructed only once. Further alternative scenarios of travel (various speeds and/or modes of transportation) can be easily set up using the travelling scenario text file. This being said, it is possible to create different merged land cover layers to simulate the impact of flooding or the construction of a new road.
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"No Data" cells in the merged land cover grids are considered as cells in which movement is not possible. It is recommended that users directly classify areas over which no movement is expected, as well as areas located outside of the study area, as "No data" before importing the land cover layer in AccessMod. This will not only reduce the computation time, but also reduce the number of classes to be managed during the application of AccessMod. However, note that the integration of the road network on top of barriers (rivers for example) within the merged land cover layer will result in the creation of bridges and therefore reclassify the concerned "No Data" cells into the corresponding road class. |
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