CV XE Geographic Information System
... Point Latitude-Longitude to Block Geocode and Shapefile
Use the CV XE GIS Point to Geocode (P2G) feature to convert point/location/address latitude-longitude to Census 2000 or Census 2010 census block geocode and create related point shapefile. The P2G feature is available as an integrated component of CV XE GIS or as a standalone Windows program.
P2G operates using an API. P2G can operate with a GUI interface, as shown in this section, or in a batch mode. The batch mode can operate with parameters passed in a command-line manner or with inputs read from a user supplied file. There are no software/data dependencies, other than your own data. Required inputs to P2G include: the input file name, input file containing the point latitude-longitude data, latitude column number, longitude column number and output file name. The input point CSV file contains a row for each point/location and a column with latitude and longitude expressed in decimal degrees. Other columns are optional. The output files are:
- CSV file with same data as in input file with additional column containing 15-character census block code
- point shapefile containing attributes included in CSV file.
Note that P2G provides a tool to convert locations by latitude-longitude to a shapefile even if the census block code is not needed.
The census block code is a 15 character code. It is comprised of:
State FIPS code (1-2)
County FIPS code (3-5)
Census tract code (6-11)
Census block code (11-15)
Directly derivable from the block code are the block group (character 1 of the block code), census tract, county and state. By having the census block code, crosswalks can be used to determine a wide range of political statistical areas where the point/address is located. Among these are city/place, school district, congressional district, legislative district, ZIP code area, metro and others.
Use this secure charge link to purchase a P2G stand-alone perpetual use license.
The following graphic illustrates the user interface and operation. The inputs are set in the left panel and the Go button is clicked to start the coding operation. This example codes a file containing 350 public schools located in New York County, NY (Manhattan). The sample file nycschools.csv is included with the P2G installer. The input values are shown in the upper section grid. The lower section shows the point shapefile that is created.
The output file is shown in the same upper section grid. The next view shows the block code has been added in the rightmost column.
Exiting P2G, the point shapefile is then used in a CV XE GIS project. The points appear as red markers in context of an OpenStreetMap layer.
The next view shows a zoom in. A school (see pointer/hand) is shown in context of related streets, census blocks (blue/white label) and block groups (red/yellow label). The identify tool is used to show a mini-profile. Note the block geocode at the bottom of the mini-profile is the same as the census block geocode shown in the map.
The next view shows a further zoom in. The identify tool is used to click on the relevant street segment and show a mini-profile.
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