Join GitHub today
GitHub is home to over 28 million developers working together to host and review code, manage projects, and build software together.Sign up
Clone this wiki locally
A typical user interaction with the tool includes 3 stages: Georeferencing the historic map image, annotating the map contents and obtaining the map description. The first stage is georeferencing where the spatial transformation parameters are obtained. The second stage consists of creating links from the map to DBpedia resources. In the third stage, the map description is stored or given to the user. These links can be of two kinds: Links from a map to modern places and links from the map to historic places.
A typical user interaction would go over the following steps:
- An user opens an Internet browser and then he types the application URL.
Georeferencing the map image
- The default tab in the left panel is called Image. The user types the URL of a scanned historic map and then he presses the Load image button.
- The user starts georeferencing the map by choosing the control point tool and pinpoints a feature in both the historic and reference map.
- When the user has pinpointed and matched certain number of POIs, the map of reference displays the borders of the historic map. The user can go to Control Points tab where a table displays the coordinates of the pinpointed features; by selecting a row, the icons in the maps change accordingly. The user can also press the button Suggest POIs which retrieves POIs from DBpedia, when the user click on a suggestion both maps pan to the suggestion's location.
- The user selects the tool Draw a map area on image located in the historic map panel. With this tool the users can draw the map area polygon in the historic map. Then the map area is displayed in the map of reference.
- Now the user can draw a 1 cm line in the historic map using the tool Draw an 1 cm line. These data is used to estimate the historic map's size and scale.
- The user can now type metadata in the tabs under the map of reference. The second tab is for general information (Metadata). Here the user can type descriptive information such as the identifier (URI) of the paper map.
Annotating the map contents
- The next tab under the map of reference is Places. This is for linking historic map contents to modern places. Here the user can type a list comma-separated names of modern places and when the Find matches button is pressed, the application retrieves matches from DBpedia. The user can check the ones matching his entries.
- The Links tab retrieves time-enabled places form DBpedia using the map's area and publication date. The user must press the button Suggested tags and then he checks the places matching the map contents.
- The Description tab allows the user to type a description for the map. By pressing the Find matches button the application retrieves potential matches to DBpedia pages. The users can check those which apply to the map.
Obtaining the map description
- Now the user can go back to the left panel where he will find the Results with the KML button. This button opens a new browser window with KML code. The user can save the KML code in a text file which can be used later for displaying the historic map in a KML-enabled software. This is just an approximation of the georeferencing results since this application does not resample the historic map in order to get a transformed image.
- Likewise, the Get RDF button in the Results tab opens a new browser window with a SPARQL query for inserting the collected metadata in a triple store.