The Show on Map function is located on screens in the Census, EPA, and USGS databases. Clicking "Show on Map" will allow you to choose how you would like to view the data. You can select Current record, Show all records, or Show only records.
The Show on Map operation will be successful only if the database records have a corresponding map object in MARPLOT®. If a record does not have a corresponding map object, MARPLOT will tell you it cannot find the object. Nearly all of the database records in LandView® IV have corresponding map objects, although there are cases where the data record did not have the latitude & longitude values that would enable a map object to be created.
When MARPLOT finds the record it will "select" it (MARPLOT places tiny boxes around the border of selected polygons, or around the symbol of selected point objects). For polygon objects like states, counties, and census tracts, MARPLOT will zoom in so that the selected object just fits the screen.
For example, you may want to look at how many EPA sites are in Wilmington, Delaware. To get the number of sites in Wilmington you would perform a Query.
Current: Show and zoom in on current record
To view a single record from the results of the query select Current record under the Show on Map button. MARPLOT will then zoom in and place tiny red squares around the site.
All: Show all records, and highlight those in the "found set"
The Show all records function shows the map objects for a collection of records. Typically, this collection of records results from a query. Whenever this option is chosen, MARPLOT will zoom in or out to fit all the selected objects on the screen. For the example above, MARPLOT would map all the EPA sites in Delaware, but highlight only the sites that are located in Wilmington by placing tiny red boxes around the borders to highlight them. If MARPLOT cannot find one or more of the map objects in the collection, it will tell you so. Nevertheless, it will select and show the objects it does find.
Only: Show only those records in the "found set"
The Show only records function allows MARPLOT to show a collection of map objects usually resulting from a query operation. MARPLOT does not select the objects, but rather hides all objects on the layer that are not in the collection. Therefore, in the example above only the 74 sites that were found in Wilmington would be shown and all other EPA sites in Delaware would be hidden.
Whenever "Show only records" is chosen, MARPLOT will zoom in or out to fit all the objects on the screen. If MARPLOT cannot find one or more of the map objects in the collection, it will tell you so. Nevertheless, it will show the objects it does find.
Source: U.S. Census Bureau
Last Revised: Wednesday, 18-Oct-2000 16:54:38 EDT
