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The columns presenting a label starting with “am” are not coming from the attribute table, but have been generated by AccessMod. These particular columns are the following: - "amSelect": allows you to select/unselect the facilities to be run in the analysis - "amOnBarrier": informs whether the health facility is located (“yes”) or not (“no”) on a barrier. The analysis cannot be performed if health facilities are located on barriers. If one or several of the health facility(ies) is/are located on a barrier, you can do one of two options:
- "amOnZero": informs whether the health facility is located (“yes”) or not (“no”) on a landcover category that has a speed of zero set in the travel scenario table. In this case the analysis cannot be performed, and you can do one of two options:
- "amOutsideDEM": informs whether the health facility is located (“yes”) or not (“no”) outside of the DEM extent (i.e. outside of the extent of the project). Facilities that are outside the DEM extend cannot be considered in the analysis and their coordinates must be corrected if there are supposed to be within the DEM extent. - "amCatLandCover": provides information on the land cover classcategory, i.e. the pixel value in the land cover raster layer. - "amDemValue": provides information on the DEM, i.e. the pixel value in the DEM raster layer. |
(6) “Type of analysis”: Select the type of analysis you want to conduct: isotropic (ignores the DEM and is slope-independent) or anisotropic (uses the DEM and is slope-dependent). In this exercise, we will select “Anisotropic” under "Type of analysis". This implies that the DEM is used to compute slopes, that are in turn used to modify the speed of travel indicated in the travel scenario table when either the "walking" or "bicycling" travel modes have been chosen for at least one landcover category. Refer to Section 3.3.2 for details on how the slope affects speeds of travel. If the "isotropic" type of analysis is chosen, slopes have no effects and the speeds of travel are not corrected.
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