Changes between Version 17 and Version 18 of Help/Concepts/Object


Ignore:
Timestamp:
2012-01-24T18:32:38+01:00 (14 years ago)
Author:
skyper
Comment:

format update

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  • Help/Concepts/Object

    v17 v18  
    1111== Nodes, ways, and relations == #NodesWaysRelations
    1212=== Nodes ===
    13 [[Image(source:trunk/images/data/node.png)]] A **node** is an individual point with a defined position.
     13[[Image(source:trunk/images/data/node.png,20)]] A **node** is an individual point with a defined position.
    1414
    1515=== Ways ===
    16 [[Image(source:trunk/images/data/way.png)]] A **way** is a sequence of nodes. Despite its name a [[Image(source:trunk/images/data/way.png)]] **way** doesn't represent ways in the real-world only. An OSM [[Image(source:trunk/images/data/way.png)]] **way** is also used to represent a river, the boundaries of a country, or even a building.
     16[[Image(source:trunk/images/data/way.png,20)]] A **way** is a sequence of nodes. Despite its name a [[Image(source:trunk/images/data/way.png)]] **way** doesn't represent ways in the real-world only. An OSM [[Image(source:trunk/images/data/way.png)]] **way** is also used to represent a river, the boundaries of a country, or even a building.
    1717
    1818==== Closed Ways (Areas) ==== #ClosedWays
    19 If a [[Image(source:trunk/images/data/closedway.png)]] **way** is closed, i.e. if the last [[Image(source:trunk/images/data/node.png)]] **node** is the same as  the first [[Image(source:trunk/images/data/node.png)]] **node**, it is also called an [[Image(source:trunk/images/data/closedway.png)]] **area**.
     19[[Image(source:trunk/images/data/closedway.png,20)]] If a **way** is closed, i.e. if the last [[Image(source:trunk/images/data/node.png)]] **node** is the same as  the first [[Image(source:trunk/images/data/node.png)]] **node**, it is also called an [[Image(source:trunk/images/data/closedway.png)]] **area**.
    2020
    2121=== Relations ===
    22 [[Image(source:trunk/images/data/relation.png)]] A **relation** is an sequence of other objects, for instance a sequence of [[Image(source:trunk/images/data/way.png)]] **ways** (representing road segments) and [[Image(source:trunk/images/data/node.png)]] **nodes** (representing bus stops) which represent a bus route. Each object participating in a [[Image(source:trunk/images/data/relation.png)]] **relation** can be assigned a **role**, for instance `stop` for a bus stop in the bus route, or `forward` for a road segment which is part of the bus route and which is only used in forward direction.
     22[[Image(source:trunk/images/data/relation.png,20)]] A **relation** is an sequence of other objects, for instance a sequence of [[Image(source:trunk/images/data/way.png)]] **ways** (representing road segments) and [[Image(source:trunk/images/data/node.png)]] **nodes** (representing bus stops) which represent a bus route. Each object participating in a [[Image(source:trunk/images/data/relation.png)]] **relation** can be assigned a **role**, for instance `stop` for a bus stop in the bus route, or `forward` for a road segment which is part of the bus route and which is only used in forward direction.
    2323
    2424== Tags ==
    2525A **tag** is a name/value pair assigned to an object. Tags are used to describe an object in detail. If we write `foo`=`bar` we mean ''The tag with key foo is assigned the value bar''. Here are some examples:
    26 * `name`=`Main road` assigned to a **way**. This tag indicates that the name of the way is `Main road`.
    27 * `amenity`=`restaurant` assigned to a **node**. This tag indicates that the **node** represents a restaurant in the real-world.
    28 * `route`=`bus` assigned to a **relation**. This tag indicates that the relation represents a bus route.
     26* `name`=`Main road` assigned to a [[Image(source:trunk/images/data/way.png)]] **way**. This tag indicates that the name of the [[Image(source:trunk/images/data/way.png)]] **way** is `Main road`.
     27* `amenity`=`restaurant` assigned to a [[Image(source:trunk/images/data/node.png)]] **node**. This tag indicates that the [[Image(source:trunk/images/data/node.png)]] **node** represents a restaurant in the real-world.
     28* `route`=`bus` assigned to a [[Image(source:trunk/images/data/relation.png)]] **relation**. This tag indicates that the  [[Image(source:trunk/images/data/relation.png)]] **relation** represents a bus route.
    2929
    3030Tags can be combined. An object can carry as many tags as necessary. Here's a more complex example:
    … …  
    3939}}}
    4040
    41 Assigned to a [[Image(source:trunk/images/data/way.png)]] **way**, this set of **tags** indicate, that the [[Image(source:trunk/images/data/way.png)]] '''way''' represents a living street with name ''Main road'' (the German name be ''Hauptstrasse''). Speed is limited to 30km/h and heavy goods vehicles (hgv) are not allowed. Furthermore, it's a one way street.
     41Assigned to a [[Image(source:trunk/images/data/way.png)]] **way**, this set of **tags** indicate, that the [[Image(source:trunk/images/data/way.png)]] **way** represents a living street with name ''Main road'' (the German name be ''Hauptstrasse''). Speed is limited to 30km/h and heavy goods vehicles (hgv) are not allowed. Furthermore, it's a one way street.
    4242
    4343You are free to assign an object whatever tag you feel necessary. However, there is a list of so called [https://wiki.openstreetmap.org/wiki/Map_Features Map Features], i.e. a canonical list of **tags** with a well-defined meaning which are often used by mappers. Whenever possible you are adviced to stick to these tags because map renderers, routing engines, and other pieces of software rely on them.
    … …  
    4747== Object ids ==
    4848The OSM server assigns each object a unique number, the **object ID** or **OSM ID**. A new object doesn't have an ID (it's ID is 0) until it is uploaded the first time to the OSM server.
    49 
    50 Under **''[[Image(source:trunk/images/preference.png)]] [Action/Preferences Preferences] -> [[Image(source:trunk/images/preferences/display.png,20)]] [Preferences/Display Display Settings] -> Look and Feel''** it is possible to en- or disable the display of objects ids in the toggle dialogs.
    51 
    52 With **''[Menu/File File] -> [[Image(source:trunk/images/downloadprimitive.png)]] [Action/DownloadObject Download object ...]''** (''{{{Ctrl+Shift+O}}}'') it is possible to download **objects** by Ids.
    53 
    54 **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/InfoAboutElements Advanced info]''** (''{{{Ctrl+I}}}'') opens seperated windows with informations about selected objects in text format. [[BR]]
    55 **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/InfoAboutElementsWeb Advanced info (web)]''** (''{{{Ctrl+Shift+I}}}'') opens the **objects' pages** of selected objects on the [http://www.openstreetmap.org OSM website] in your web browser.
     49* Under **''[[Image(source:trunk/images/preference.png)]] [Action/Preferences Preferences] -> [[Image(source:trunk/images/preferences/display.png,20)]] [Preferences/Display Display Settings] -> Look and Feel''** it is possible to en- or disable the display of objects ids in the toggle dialogs.
     50* With **''[Menu/File File] -> [[Image(source:trunk/images/downloadprimitive.png)]] [Action/DownloadObject Download object ...]''** {''{{{Ctrl+Shift+O}}}''} it is possible to download **objects** by Ids.
     51* **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/InfoAboutElements Advanced info]''** {''{{{Ctrl+I}}}''} opens seperated windows with informations about selected objects in text format.
     52* **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/InfoAboutElementsWeb Advanced info (web)]''** {''{{{Ctrl+Shift+I}}}''} opens the **objects' pages** of selected objects on the [http://www.openstreetmap.org OSM website] in your web browser.
    5653
    5754Alternatively, you can browse the objects directly by entering following address in your web browser:
    … …  
    6461Each object has a **version**. The **version** is incremented whenever the object is uploaded to the server and the OSM server not only stores the most recent version of an object, but it's complete **history**.
    6562
    66 **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/ObjectHistory History]''** (''{{{Ctrl+H}}}'')  opens the [Dialog/History#Workingwiththehistorybrowser History Browser]. The History Browser will show you the **versions** of a particular object.
    67 [[BR]]
    68 Alternatively, **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/ObjectHistoryWeb History (web)]''** (''{{{Ctrl+Shift+H}}}'')  opens a page on the [http://www.openstreetmap.org OSM website] in your web browser which displays the object history, too.
    69 
    70 In the [[Image(source:trunk/images/dialogs/history.png)]] [Dialog/History History Dialog] you can load the **history** of an object and launch the [Dialog/History#Workingwiththehistorybrowser History Browser].
     63* **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/ObjectHistory History]''** {''{{{Ctrl+H}}}''} opens the [Dialog/History#Workingwiththehistorybrowser History Browser]. The History Browser will show you the **versions** of a particular object.
     64* Alternatively, **''[Menu/View View] -> [[Image(source:trunk/images/about.png)]] [Action/ObjectHistoryWeb History (web)]''** {''{{{Ctrl+Shift+H}}}''} opens a page on the [http://www.openstreetmap.org OSM website] in your web browser which displays the object history, too.
     65* In the [[Image(source:trunk/images/dialogs/history.png)]] [Dialog/History History Dialog] you can load the **history** of an object and launch the [Dialog/History#Workingwiththehistorybrowser History Browser].
    7166
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