• Begin by creating or linking into your taxonomy a Variable of type "coordinate." This is a special variable type that expects an x and y, and optionally z, decimal value. See Variables of Type Coordinate.
• Create a Predefinition that includes the coordinate-type variable created above. This may or may not include other properties. The predefinition should contain only one coordinate-type variable (if others are present then only the first will be used).
• Create a Resource for a georeferenced raster image. Be sure that the image is tagged as a "geospatial"-type resource. Go into OCHRE's Map View to view this image.

• Use the Linked Items pane to find the database item whose coordinates you wish to assign. For example, find the "Locations & Objects" item using the "Find by name" feature and select it using the checklist feature of the Query Results pane. Alternatively, navigate to the required item in Map View's navigation pane (on the left-hand-side).
• Click the "Identify Coordinate" tool from the Map viewer toolbar. The cursor will become a cross-hair. Position the cross-hair at the required location on the map and click. OCHRE will capture the x and y coordinate values at the mouse-click location.

• OCHRE will have you confirm the value of the given property being assigned to the selected item. Upon confirmation this property will be merged with any other properties of this item and posted to the database. If the property-variable already exists a new instance of it will be added (that is, it will not overwrite existing values). If an observation is needed (that is, if the item has not yet been described using any properties) it will be created automatically.
• Repeat as necessary, selecting appropriate items from the Map View navigation pane, or the Query Results pane and clicking on their coordinate locations. Note the toggle button on the toolbar that lets you turn on grid-lines, drawn at integral-intervals based on the map unit across the extent of the map both horizontally and vertically, to help locate coordinates..

Copying Point Coordinates

(since summer 2017)

Point coordinates can be copied from one item to another. An archaeologist may want to do this, for example, to assign the closing elevation(s) of a locus of excavation to be used as the opening elevation(s) of a new locus.

• Begin by bringing into view the elevation points to be copied.
• Zoom in far enough to be able to distinguish and select the point(s) you wish to copy.
• In the navigation pane in the left-most panel, select the item to which the points are to be assigned.
• In the Predefinition pick-list, select a predefinition to be used to assign the point(s). Be sure to choose a predefinition that includes an appropriate coordinate-type property.
• Click the x,y-marquee coordinates button to activate its selection mode. Click-and-drag to select the point(s) to be copied. OCHRE will copy only visible points.
• OCHRE will display a confirmation message, indicating the action that will be performed; confirm or cancel. If you proceed, the selected coordinates on the map canvas will be assigned to the currently selected item in the navigation pane.