This section describes ways to interact with the map. These controls work at any time, before, during, or after a search.
To pan around the map, click and drag. The map will move under your cursor. To stop dragging, release the mouse.
To get a better view of areas on the map, use your mouse wheel to zoom in and out. Wheel up to zoom in, and wheel down to zoom out.
If you don't have a mouse wheel, use the small zoom control in the upper left corner of the map. + zooms in, - zooms out.
This section describes the various search parameters you can use to run queries. By combining some of these parameters, your search will return more relevant results.
Keywords are words or phrases that express the main ideas of a document. Steward will limit its search to the documents relevant to your keywords. For example, if you want to find documents related to hurricanes, use the keyword hurricane.
NOTE: Including a geographical reference (e.g. "Florida") in the keywords is unnecessary. You can set a geographical reference with the Location parameter.
The location parameter restricts your search to a specified area. To set the search location, first click the "Set Location" button. Then, click on the map area you'd like to search. A will appear on the map to indicate the search location. Also, the latitude and longitude of your search point will be displayed in the search form.
To clear the location parameter, click the "Clear Location" button.
When you've selected a search location, you can choose how Steward returns search results. The order by parameter gives Steward a method of ordering results. By default, Steward returns documents by increasing distance from the search location. However, you can specify "state" to return all results in the closest state first, then the next closest state, and so on. Currently, Steward supports ordering by distance, state, county, congressional district, or school district.
NOTE: The default, "distance", is suitable for most purposes.
In general, documents have many geographic references sprinkled throughout their text. Most geographic references could refer to multiple geographic locations. For example, there are over 50 cities or towns named "Springfield" in the USA. Steward assigns one location to each reference, as well as a measure of confidence that it made the correct assignment.
By tuning the confidence parameter, you can change the minimum level of confidence needed to display a document result. A high confidence setting will cause Steward to retrieve documents containing high confidence geographical references, but might filter out some relevant documents. A low setting will allow Steward to match low confidence references, but might return less relevant documents.
Move the confidence slider toward the red for higher confidence matches. Move it toward the blue to relax the confidence restriction.
NOTE: The default is suitable for most purposes.