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Introduktion til JOSM

Terminologi

Et "punkt" er en prik og en "vej" er en linje der forbinder flere punkter. Dette betyder at "vej" er en generel betegnelse for en række af forbundne punkter, ikke kun for veje og gade i virkeligheden. En relation er en ordnet rækkefølge af veje og punkter, en logisk beholder til at gruppere elementer. Et "område" er en vej hvis ender er forbundet, men er derudover ikke noget særligt.

Hvis en vej eller sti er kurvet, angives det ved at bruge en antal punkter i en vej, med korte linjer til at forbinde dem. En vej har en retning, hvilket er nyttigt for et antal tags. F.eks "oneway=yes" er en vej hvor kørsel kun er tilladt i den retning den er tegnet. Andre tags henviser til at være til venstre eller højre, i kørselsretningen på vejen.

Start af JOSM

JOSM er et Java program, og kommer i en .jar fil. Hvis du ikke ved hvordan du skal starte det, så spørg nogen som kender din platform om hvordan man kører et Java program. Du bør måske også læse installations noterne.

Når JOSM starter, viser den dig nogle beskeder om de nyeste ændringer i JOSM. Du bør kigge på denne side en gang i mellem for at holde dig informeret om nogle af de mere interessante ændringer.

Dit næste skridt bør være at hente nogle data. Hvis du har en GPX-fil (downloadet fra din GPS modtager) for et område, kan du indlæse det i JOSM (Filer/Åbn). Dette vil vise dig område for din GPX-fil. Klik på den grønne nedadpegende pil for at hente data fra openstreetmap.org.

Et andet alternativ er at downloade eksisterende GPX punkter fra OSM serveren. For at starte denne process skal du kende breddegrad- og længdegradskoordinaterne for et relevant område. Den nemmeste måde at gøre dette, er ved at bruge downloadvinduets flytbare kort, i den første fane. Du kan flytte rundt på kortet, zoome ind og ud og markere det område du er interesseret i. Læs mere om download vinduet.

Redigering i JOSM

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 breaking anything. Subsequential actions on a single element will go into the database as a single modification when uploaded.

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.

Ways on their own are not of much use unless they are tagged to say what they represent. ​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".

Editing properties refers to all the currently selected, i.e. highlighted, elements (nodes and ways). To select anything you must be in select mode which can be switched into by clicking the first of the left hand icons or hitting the "S" key. Ensure your new way is highlighted, then click the "Add" button, a dialog box will appear and you will be asked to select a key and a value. Type in the key/value pair which represents the way you are creating, e.g. for the key type "highway" without the quotes, and for value type "secondary" again without the quotes. Now click OK. You have now tagged your way.

Uploading to OSM

If you are happy with all that you have done then you need to upload this to OSM server. Click on the green up arrow .

JOSM will give you an overview on the elements it's about to upload. You're also asked to provide a short freetext summary of your edits. This description will be saved with your data on the server and serves information purposes like for example the ​Recent Changes list.

With a click on "Upload changes" your data will be uploaded and visible for everyone else.

See Upload to OSM for further informations on uploading.

Conventions

A couple of other points about creating ways.

1) Dual carriage ways should be drawn as two separate parallel ways, with each carriage way being a different way.

2) If a street is one way (including the individual carriageways of a dual carriageway) the way should be drawn in the direction of travel.

3) The key / value tagging is case sensitive, all keys should be entered in lower case.

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