| | 5 | Geo data edited in JOSM is only available locally and only usable by the user who entered the data unless the user decides to make it available to the community too. In order to publish data the user has to '''upload''' it. Uploading means that the geo data is transferred to a central server run by the OSM community where it is integraded with geo data from other mappers in a central database. It's by uploading data that locally edited geo data both becomes part of the [http://www.openstreetmap.org public maps] and can be used by other members of the OSM community. |
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| | 8 | == Changesets and upload requests == |
| | 9 | Geo data contributed to the OSM server consists of [wiki:/Help/Concepts/Object nodes, ways, and relations]. Because there are hundreds of mappers publishing their geo data on the OSM server it is important to track who published what data in which context. It would be tedious for mappers to describe for every singe node and every single way why it is published. A more convenient approach is to package a group of related objects and assign the package a comment, not the individual objects. |
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| | 11 | The OSM project calls such a package a '''[wiki:/Help/Concepts changeset changeset]'''. A '''changeset''' is a collection of related changes (new objects, object modifications, or object deletings) applied to OSM data. |
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| | 13 | Changesets are not equal to '''upload requests''', though. A changeset is a '''logical''' grouping of [wiki:/Help/Concepts/Object objects] whereas an upload request is a '''technical grouping''' for the purpose of transferring geo data to the central OSM server only. In JOSM we say, that objects are uploaded '''using''' upload requests '''to''' a changeset. The JOSM Upload Dialog allows one to configure both aspects of the upload requests to be used and of the changeset objects are uploaded to. Some of the settings are compulsory (i.e. the user has to configure them before he or she can upload geo data) but most of them are optional and JOSM works with reasonable default values. |
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| | 15 | In the most simple case there is only one upload request into a changeset: |
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