Filters restrict the passes extracted from the geographical selections. Three criteria are used to filter:
Facts / to do. The inclusion of passes already climbed or to be climbed. This filter is only included when you are in memberFor it to work, you need to have downloaded the codes for the passes you have already climbed from the Settings page (details). Note that even if you have ticked both types, the two types of collar are displayed differently on the files. See the help pages for each file type in the user guide on the Settings page. By default, both collar types are included.
Altitudes. The altitude range to be used. Passes outside this range will be excluded. For example, you can include only passes of 2000 metres or more by using a minimum altitude of 2000 m : Note that passes over 2000 m and those under 2000 m are differentiated in the geolocation files by different symbols. See the help pages for each type of file in the user guide on the Settings page. By default all altitudes are included (from zero to 9999 m)
Collar categories. They correspond to the "degrees of difficulty" or type of route in the catalogues. The list differs slightly from country to country. You can choose one or more categories. There are also two shortcuts for checking and unchecking everything. By default, only road passes are included. Note that if a geographical selection is made on a map road (e.g. Michelin, GKP) bearing the words (Truck drivers) or (Road only)only the passes road (tarmac) will be extracted, even if the filters select other categories of non-road passes.
The effect of the filters is cumulativeFor example, if you use the set of filters above, you will extract from your geographical selection all the passes over 2000 m that you have not yet climbed, whether by road, by bike or that you can easily push.
Please note The categories of passes have been largely unified between the different countries, with the exception of the USA where a very simplified scale is used, based on the type of access (road, trail and off-trail). Depending on the country and even the region, the categories are more or less well known. The proportion of passes for which the rating is unknown thus varies from a few percent for countries without high mountains to 2/3 or more for countries with many passes that are difficult to access and therefore less well known by our members. Everyone can contribute to improving this data by sending their suggestions for ratings to the following address: cols@centcols.org. So don't hesitate to share your knowledge of the passes in the regions you've visited with others.
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