Changes between Version 14 and Version 15 of Introduction


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Timestamp:
2009-02-02T02:41:38+01:00 (17 years ago)
Author:
russ@…
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  • Introduction

    v14 v15  
    1 '''This page is out of date. Please fix it.'''
    21
    32= Introduction to JOSM =
    43== Terminology ==
    54
    6 I'll refer to "roads" below, but the same applies to any
    7 "way", eg footpaths, bridleways, railways, rivers etc, basically any line
    8 you want represented in OSM.
     5A "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.
    96
    10 A "node" represents the start and end of a segment, and should be wherever
    11 there is a significant change in direction, or a junction. Segments are
    12 then drawn between each node, with curves being made up of a series of
    13 segments.  A collection of these segments forms a "way", which is a group of
    14 segments which are collected together.  In general in urban areas it would
    15 be usual for most roads to be formed into only one way, but when you get out
    16 of towns the roads become longer and may be represented by a number of ways
    17 next to each other.
     7== Starting JOSM ==
    188
    19 == Prior to actually editing ==
     9JOSM 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.
    2010
    21 Before you start to add or amend OpenStreetMap data, you will somehow need to know where your roads are going to be!
    22 
    23 The easiest case to start with is where you have your own GPX track of a route saved on your own computer.   Use menu option Files > Open to load the GPX file into JOSM.  You will then see in the [wiki:Help/MapView main map view] window a series of dots representing your GPX track.
     11When JOSM starts up, it presents you with a few messages about recent changes in JOSM.  Your next step should be to download some data.  If you have a GPX file (downloaded from your GPS receiver) for the area of interest, load it into JOSM (File/Open).  That will show you the area of the GPX file.  Click on the green down arrow [[JosmImage(download)]] to fetch the data from openstreetmap.org.
    2412
    2513An alternative is to download existing GPX points from the OSM server.  In order to start this process you will need to know the latitude  and longitude coordinates of the relevant area.  The easiest way to do this is to visit the [http://www.openstreetmap.org/index.html map] and to zoom in to the area you are interested in, then to move the mouse over the View tab, and copy the resulting link.  You will need to have zoomed in to a fairly small area, in residential areas where there is a lot of existing OSM activity you will need to be at a zoom level of 12, other less dense areas will probably be able to be downloaded at zoom level 14.  Once you have copied the OSM link ( which will look something like {{{http://www.openstreetmap.org/index.html?lat=50.687181128986&lon=-1.0795289310465817&zoom=14}}}) you can then paste this into the "URL from open streetmap.org box on the JOSM [wiki:Help/Action/Download download option].
    … …  
    5240
    5341If you are happy with all that you have done then you need to upload this to
    54 OSM server.
     42OSM server.  Click on the green down arrow [[JosmImage(upload)]].
    5543
    5644== Conventions ==