Using the Map
The Japan Disasters Digital Archive (JDA) MAP has two modes of display.
HEAT MAP DISPLAY: When there are more than 250 items displayed on the portion of the map that is visible on your screen, the geo-located items in the archive are displayed as a heat map. This provides users a broad view of the relative distribution and concentrations of items in the archive. If you filter your search by keywords, the heat map will show you the distribution and concentration of items on a specific topic, in the area you are looking at. This can be helpful to understand which issues are significant in which regions.
CONTENT DISPLAY: When fewer than 250 items are visible, they are displayed as red dots. In some cases, there are multiple items for the same location, so a single dot will give access to all those items.
To view a specific item, place the cursor over the relevant dot and left-click your mouse. That will open the title of the item. A second left click opens the full item. You can drag and drop the items into a Collection directly from the map.
OTHER FEATURES – MAP ZOOM: You can zoom in to a specific area either by using the +/- buttons on the upper left-hand corner or (and highly recommended) you can create a box around any area on the map and immediately zoom to that area. To do this, place the cursor over the area where you want to zoom in. Then, press the shift key and left click on the mouse to draw the box. When you unclick, the map zooms into the boxed area.
OTHER FEATURES – DATE & TIME SLIDER: You can also specify a date and time range for a map search using the time slider in the upper right corner of the map. You can add any of a wide array of layers (tsunami inundation zone, cumulative radiation, etc.) by clicking on the tile icon next to the time slider.
Please note that only archived items with geo-location metadata are displayed on the map.