To use the zoom tool to zoom-in,

The zoom-in view appears. Reverse the process to zoom out.  Refer to user guide for additional information.

Also illustrates use of identify tool to display mini-profile for selected tract (see pointer)

The Add Layer button is used to create another instance of the state by tract boundary file.

The Layer Editor is used to select different subject matter.

The resulting thematic map shows population density by census tract.

To develop the above view, the rendering query is set for two sections/intervals in the Layer Editor -- graphic below.

The query DP1001/(lasqmt/2589988)<300 is used to display tracts meeting this criteria light blue.

DP1001 is total population; lasqmt is land area in square meters; the constant adjusts square meters to square miles.

The Texas statewide all public schools shapefile is included in the project setup file (CVInstaller described in Step 1).  The shapefile is named schools2008_tea.shp sourced from the Texas Education Agency.  This shapefile is included so that you can see how add and use your own point/marker shapefile.

Texas shapefile dbf attributes

Use the Add Layer toolbar button to add another instance of the state by tracts shapefile to the project.  Add the shapefile c:\cv\tracts\tracts_tx.shp.  Uncheck the $MHI by Tract layer.  The view now appears as shown below.

Use the Add Layer toolbar button to add the schools shapefile to the project. Add the shapefile c:\cv\tracts\schools2008_tea.shp.  The view now appears as shown below.

Use the zoom tool to zoom in to the Dallas area (see pointer in above view)

The above view is centered in Dallas County ('square-ish' boundary).  Zoom further to the pointer in the above view and expand the overall window. dbl-click on the new tracts layer in the legend panel starting the Layer Editor.  Use the Label tab to add the TRACT field as the label; select the position as centered.  The view appears as shown below.

Suppose you only want to view middle schools.  Dbl-click the schools layer in the legend panel starting the Layer Editor.

Use the Section tab and set the query to GRADEGRP='2' and distname like 'DALLAS ISD%' (Dallas ISD Middle Schools) as shown below.

Click the Label tab and select campname (campus name) as the label.  Click OK.

The following view appears.  This process illustrates how to select all schools of a given type in a particular school district.  The identify tool (see pointer) is used to profile one school.

Selected higher income tracts are selected for a study area.  The item DP1023 (Population 65 years and over) is selected as subject matter.  There are 8,780 people 65 years and over in the selected 18 tracts (see upper right section in next graphic by pointer).  Tract codes are listed in the lower right section.

To add roads for a county, using Texas and Dallas County as an example, use a Web browser and connect to http://www2.census.gov/cgi-bin/shapefiles/county-files?county=48113 (state 48 county 113).  Dbl-click "All lines" and expand that set of files to c:\cv\tracts.  Use the CV Add Layer button to add the all lines shapefile to the project (C:\cv\tracts\tl_2008_48113_edges.shp).  To view just roads (not all lines), dbl-click the new all lines layer name in the legend panel.  In the Layer Editor panel, click the Section tab.  In the Render if edit box, key the text: ROADFLG='Y' and click OK.  The roads now appear.

To add counties, using Texas as an example, use a Web browser and connect to http://www2.census.gov/cgi-bin/shapefiles/state-files?state=48 (state 48) and dbl-click "Current County and Equivalent".  Expand all files in that zip file to c:\cv\tracts.  The following example shows the county boundaries and counties labeled with name.

Tract 007604 (highlighted) is shown in the map view for site analysis and other tract labeled graphics above.