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(9) “Add short tags”: Give short tags to be attached to the different outputs of the analysis. We will use "accessibility 120" for the present exercise.
Validation:
(10) The validation section tells you if everything is fine for you to start the analysis. First it gives you an estimation of the required memory and disk space necessary to run your analysis. Note that these estimations are indicative, and the real requirements may vary. If the memory requirements are close to the memory allocation you gave to the Virtual machine, it is a good idea to increase the latter (see Section 4.2 for how to do that). If anything is wrong in the settings, the "Compute button" will be red and a warning/error message will appear in the list, indicating errors that you will need to address prior to running the analysis. If everything is fine and all the fields have been correctly filled, a green “OK” will appear next to each item in the list and the "Compute button" will be grey (example here above). When this is the case, you can hit the button to launch the analysis.
A transparent window with some text and a progress bar will appear in front of the panel while the analysis is being conducted. Please wait until this window disappears to continue using AccessMod. Once this is the case, go back to the Data module to check the four two output data sets that have been generated:
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- scenario processed class: Table containing the travel scenario that has been processed.
- travel time class: Raster format layer containing the spatial distribution of the travel time expressed in minutes.
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Before being able to open and look at these datasets you need to archive and export them outside AccessMod (i.e. outside the AccessMod virtual machine). To do that, do the following steps in the "Data" module:
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Note |
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The .img file exported by AccessMod might need to be converted into a raster format grid before you can use it to perform other types of analysis in the GIS software you are using. Please refer to the user manual of the GIS software in question to find out how to perform such a conversion. This layer can be used in the zonal statistics tool to measure accessibility coverage at the zone level. Please see Section 5.5.6 for more information. |
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