To pan around, drag with the right mouse button. Alternatively, you can hold down Ctrl and use the arrow keys. While zooming in you need to point the mouse at the data you wish to zoom towards. Yellow hatching diagonal lines indicates areas which are not loaded into JOSM at the moment. You should see a rectangular area with a plain black background. This is area you have downloaded.

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You added presets to these objects in order to attach information about them. By the end, you were able to draw your own map in JOSM.

This was good practice, and now we are ready to edit OpenStreetMap. But because JOSM is a desktop application, it works a little bit differently. Remember that you need to do this every time that you want to make changes to the map, because the map is often being updated by other users. This will open up the download window. You can access this window more simply by clicking on the download button, shown here: When the download window opens, you should see a map.

Use your mouse to pan and zoom it to an area that you know very well, such as your hometown or neighborhood. The controls are the same as in the JOSM map window. The right mouse button lets you drag the map, and your scroll wheel allows you to zoom in and out. Sometimes if you are working on a notebook computer it can be difficult to scroll in and out.

Working in JOSM is much easier if you have a mouse, but most modern notebooks allow you to scroll using the touchpad. Draw a box around the area that you want to download.

To draw a new box, click on the map, hold your left mouse button down, and drag your mouse to create a box. Release the mouse button to finish drawing the box. Add Imagery If you followed along when we added our first points with the iD editor, you remember that beneath the map data there was a satellite image that helped us identify objects on the ground. This imagery was from Microsoft Bing, which generously provides its imagery for OpenStreetMap users to reference while contributing to the map.

You may need to click on the down arrow to find it. The main window you are already familiar with - this is the map window, and it is where most of the action takes place. Here you will view, edit, and add to the OpenStreetMap data. To the right of the map window are a series of panels, each of which has its own function.

When you select a point, line, or shape in the map window, it will be shown in the Selection panel. Information about the object will be shown in the Properties panel, and the username of the author of that object will be shown in the Authors panel.

These panels can be opened or closed by clicking on the various buttons on lower left side of JOSM. Above these buttons in the upper right are tools which change what you can do with your mouse. You are already familiar with some of them, the Select tool and the Draw tool. Below them are tools which make it easier to zoom in, delete an object, draw a shape, or create a line that is parallel to another line.

Edit So we have completed step one of the editing process - Downloading. We have prepared JOSM with satellite imagery as a reference. The next step is to edit the map and add new items. Depending on the area that you chose to download, there may be a lot or very little existing map data.

But notice that it is the same sort of data that we have seen previously - points, lines, and shapes that represent real-life locations.

Use the techniques you have already learned to add a couple points to the map of places that you know. If you see any mistakes, try to fix them. If you want to move a point, line, or shape, use the select tool. Click on an object and drag it where it should be. This can be used to correct the location of items that have been put in the wrong place.

Use the draw tool to draw new points, lines, and shapes. Describe these objects by selecting from the Presets menu, as you did in the previous section. Never edit the map outside of the area you have downloaded. You can see the rectangular area you have downloaded has a solid background, while the area you have not downloaded has diagonal pinstriped lines. Save Changes The third and final step to complete our edits is to upload the changes we have made to the OpenStreetMap database.

To save the changes, we must be connected to the internet. This will open up the upload window. You can access this window more simply by clicking on the upload button, shown here: The window that appears shows a list of the objects that you are adding and the objects you are modifying or deleting.

In the box at the bottom you are asked to provide a comment about the changes that you are making. Type in here a description of your edits. If this is your first time saving changes to OpenStreetMap, you will be asked for your OpenStreetMap username and password.

Enter them in the window that appears. You will need to wait a few seconds for your changes to be uploaded, and then you are done!

You have edited the map on OpenStreetMap. When you are editing, always be sure to upload your changes before you close JOSM. Even if you still have more editing to do, upload your changes, and then go through the process again later when you have time to edit. You should see your changes now appearing on the map! Also, check your additions in JOSM to make sure that you added them correctly. Of course you also need to learn how to go outside and collect information about places on the ground.



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Keyboard Shortcuts

Remember in the introduction chapter when we asked you to draw a map of your town or village? We will conclude this chapter by drawing your map again, this time digitally. After this you should have a good understanding of how to draw maps in JOSM. In the address bar at the top of the window, enter the following text and press Enter: josm. If you have a different operating system, click on the link for your system. Your download should begin.

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