Search

The Search page allows users to query the Geographic Calculator geodetic Datasource to view details of coordinate systems, transformations, and other object definitions. The Datasource is one of the largest in the industry; use the provided filters to narrow your search results.

The search results can be filtered by text search in the left sidebar and/or the map search in the center of the screen. In mobile view or a narrow browser window, the map search will appear below the text search.

Text-Filtered Search

The left side bar contains the option to search by text. Type all or part of an identifying term in the Search For field.

Below the search bar are a number of optional filters that can be applied to constrain the search results.

Search Within

Use the Search Within drop-down to narrow the search to find matching text within a specified category.

Everything	Search within all fields. This includes object names, remarks, identifiers, and area of use names and remarks.
Names	Search within the descriptive name of the object.
Remarks	Search within the comments saved with the object. This may include supplementary information.
Geographic Areas	Search the name and descriptions of the area of use of the object.
EPSG Codes	Search by the EPSG code
Codes of Issuer	Search by other issuer codes. Choose the issuer from the drop down list.

Include Deprecated	Enable to include objects that have been deprecated. EPSG objects that are deprecated are older definitions that have been replaced by another definition that is seen to supersede the deprecated object. Deprecated records should only be used when documenting or reversing use of the record that was made before it was declared invalid.
Display Verbose Results	Enable to display additional information about objects in the search results, including Datum, Unit, Min and Max Point, Area of Use, Dimensions, etc. For Early Bound Coordinate Systems, verbose results will also display the Base Coordinate System and Transform Name. When Verbose results are off, the search will only display the Name, EPSG code when applicable, and Remarks.

Object Type Filter

Filter the search results by object type. See Object Type Definitions for further information.

Units of Measure	Search units of measure object definitions. This can be further restricted by the unit type: Angular, Linear, or Scalar units.
Prime Meridian	Search Prime Meridian object definitions.
Ellipsoid	Search Ellipsoid object definitions.
Coordinate Points	Search point style definitions. These are subdivided into Cartesian, Geodetic, Projected, Vertical, and String point styles.
Area of Use	Search Area of Use objects.
Horizontal Datum	Search Horizontal Datums.
Vertical Datum	Search Vertical Datums.
Coordinate Systems	Search within Coordinate Systems. This can be restricted to just Horizontal or Vertical Coordinate Systems. When applicable, additional filters for Coordinate Systems will be available to search by Area of Interest or Datum.
Single Transforms	Search within Single Transformation objects. This can be further filtered to Datum, Parametric, or Vertical transformations. When this Object Type is selected, additional search filters will be available for searching Area of Interest.
Concatenated Transform	Search within Concatenated Transform definitions. When this object type is selected, additional filtering will be available by Area of Interest.
Scope	A description of the primary purpose to which a coordinate reference system, datum, or coordinate operation is applied.
Usage	Defines how and where a coordinate system, datum, or transformation, is intended to be used. A coordinate system or transformation can be tied to multiple usages. A usage includes both a scope and an area of use. Area of use represents just the geographic extent.

Map Search / Area Filtering

The Map Search Options filter the search results to only objects which have Area of Use containing or intersecting your specified location. This can be used separate from or in conjunction with the text search.

To zoom in and out, scroll the mouse wheel, pinch/spread two fingers on a touchscreen, or use the plus and minus buttons in the top left. To pan the map, click on the map with a mouse button (or tap on touchscreen) and drag the map to reposition. In desktop mode, the current cursor location will be displayed in the top right of the map window.

Contains Location

This option will return all objects that have an area of use containing the point. Click or tap on the map to specify a point, or enter a latitude and longitude in decimal degrees.

Intersects Bounds

The Geolocate option will center the map on your current location. The web tool will prompt you for permission to access your current location information. After accepting, the map will center on your current location. A coordinate pair or bounding box is still required for filtering the search results.

 

Search Results

The results of the search query will display in a pop-up table organized by object type. The total number of matching objects is listed in blue at the right side of each category type.

Click or tap on a object type to show or hide the results for that category.

Specify an Items per page value to determine how many results to show for each object type. Objects that contain more matches than the page limit will show page numbers at the bottom of the results. Click the page number at the bottom of the results table to move between pages.

Click the object name to view the full object definition in a new tab. For more information on these definitions, see Definitions

Actions

Choose the Actions menu to perform an action with the object.

The View GML Definition and View WKT Definition options will open a new tab with the GML or WKT definition.