Changes between Version 19 and Version 20 of Introduction

Timestamp:

2009-04-24T11:59:19+02:00 (17 years ago)

Author:

frawe

Comment:

some more clarification

Introduction

@@ -3 +3 @@
 == Terminology ==
 
-A "node" is a point and a "way" is a line connecting multiple nodes, and a "relation" is an ordered sequence of ways. An "area" is a way whose ends are connected, but other than that isn't special. If a road or track or path is curved, it is approximated using a number of nodes within a way, and short lines connecting them. A way has a direction, which is useful for a number of tags, e.g. "oneway=yes" is a road which goes only in the direction the way is drawn. Other tags refer to being on the left and right; of the direction of travel along the way.
+A "node" is a point and a "way" is a line connecting multiple nodes. This means "way" is a general term for series of joined nodes, not only for roads or ways in reality. A "relation" is an ordered sequence of ways and nodes, a logical container to group elements. An "area" is a way whose ends are connected, but other than that isn't special.
+
+If a road or track or path is curved, it is approximated using a number of nodes within a way, and short lines connecting them. A way has a direction, which is useful for a number of tags, e.g. "oneway=yes" is a road which goes only in the direction the way is drawn. Other tags refer to being on the left and right; of the direction of travel along the way.
 
 == Starting JOSM ==
 
-JOSM is a Java program, and comes in a .jar file. If you don't know how to start it, ask someone familiar with your platform how to run a Java program.
+JOSM is a Java program, and comes in a .jar file. If you don't know how to start it, ask someone familiar with your platform how to run a Java program. JOSM is an offline editor which means everything you do won't be visible for anyone else until uploading it to the server. This makes it possible to experiment and repeatedly moving, tagging, adding and deleting elements without harming anything. Subsequential actions on a single element will go into the database as a single modification when uploaded.
 
 When JOSM starts up, it presents you with a few messages about recent changes in JOSM. You should have a look at this page from time to time as it keeps you informed on some of the more interesting changes.
@@ -19 +21 @@
 The first step of actual editing is to add a node to the OSM data where there will be a junction or a significant change in direction. To add a node, highlight the node button, either by clicking the 2nd button in the left menu bar, or by hitting the "A" key on the keyboard (the 2nd button should then be highlighted). Move the mouse cursor over your GPS track, and left click it wherever you want a node to be. A white dot (a selected node) should appear and a rubberline span from that dot to the mouse cursor. As you create subsequent nodes the earlier nodes will be shown as yellow dots.
 
-A series of joined nodes forms a way. This means "way" is a general term for series of joined nodes, not only for roads or ways in reality.
+A series of joined nodes forms a way.
 
 Ways on their own are not of much use unless they are tagged to say what they represent. [http://wiki.openstreetmap.org/index.php/Map_features Map Features] shows all the current key value pairs which could be used on a way. Ensure the properties pane is open on the right hand side of JOSM, the 8th button on the left (an icon with a wrench over a document) should be highlighted. If not click that button or hit "Alt+Shift+P". The properties pane has three buttons: a plus sign with "Add" next to it, then "Edit", then "Delete".