Map

The interactive map (based on Leaflet) is a tool to present and enter a place’s location. PostGIS is used for creating and manipulating spatial data.

Navigation

• Zoom in/out of the map by using your mousewheel or the +/- buttons in the upper left corner

• Drag the content with the mouse (left click and hold)

• Change the basemap by using layer button in the upper right corner

• Switch to full screen with the rectangle in the upper left corner

Search

Press the magnifying glass icon on the left side to search for a places. The search filters data on GeoNames and provides a list of places with the same name. Choosing the desired places allows to import the geonames ID and/or the coordinates of said place into the OpenAtlas place form (see below).

WKT import

With the icon WKT text can be imported. Clicking this button will open a new popup where a WKT geometry can be entered. If the geometry is valid, the draw geometry button will be enabled. By clicking this button the geometry will be drawn on the map and the respective geometry popup will open to enter title and description for this geometry.

Possible WKT geometries with examples are:

• POINT(30 10)

• LINESTRING(30 10, 10 30, 40 40)

• POLYGON((30 10, 40 40, 20 40, 10 20, 30 10))

Adding new geometries

When in insert or update mode of a place you have the following options (more than one can be used):

• Set a marker/point at the position where the physical thing is located

• Draw a line connected to a physical object’s spatial characteristics, e.g. the course of a road or the bed of a river

• Draw the shape of a physical thing if the precise extend is known

• Draw an area in which the physical thing is located with 100% certainty

GeoNames

The GeoNames ID field can either be entered manually or imported from the map’s search result

Exact match should be used if there is a high degree of confidence that the concepts can be used interchangeably. By default it is a close match, which means that the concepts are sufficiently similar that they can be used interchangeably in some information retrieval applications. Please refer to SKOS for further information.

Map Overlay

If the module map overlay is activated in the Profile settings, added overlays for places will be visible on the map by default and can be toggled with the map layer button at the upper right corner.

To insert new overlays (only available for editors and admins) go to the view of a specific place. After adding an image file in the file tab you can click link in the overlay column to enter coordinates (Easting and Northing) for:

• top left corner

• top right corner

• bottom left corner

of the image to position it on the map. The coordinates have to be stated in WGS84 decimal degrees (EPSG 4326).