# Forum: Ruby US Zipcode API for Ruby?

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on 2005-12-13 19:48
```Does anyone know of API (and database) for Ruby to provide information
(city/state) for zipcodes?  Also helpful would be zipcodes within a
given

If something doesn't exist natively for Ruby I might utilize a web
service.```
on 2005-12-13 20:03
```There is a 40,000+ zip code database in CivicSpace labs that has lat and
long by zip code:

http://civicspacelabs.org/releases/zipcodes/zipcod...

Distance between two points (lat, long) is calculated using the
Haversine formula:

dlon = lon2 - lon1
dlat = lat2 - lat1
a = (sin(dlat/2))^2 + cos(lat1) * cos(lat2) * (sin(dlon/2))^2
c = 2 * atan2(sqrt(a), sqrt(1-a))
d = R * c

http://mathforum.org/library/drmath/view/51879.html```
on 2005-12-13 20:12
```Excellent!  The only thing remaining is an efficient algorithm for a
search
for all zipcodes within a given radius.

I suppose one technique might be to first narrow the databse search
within a
given a given square latitude/longitude range and then filter those
results
by testing that they are within the given circle radius```
on 2005-12-13 20:30
```>The only thing remaining is an efficient algorithm for a search for all zipcodes within a

http://www.4guysfromrolla.com/webtech/040100-1.shtml

' THIS VARIABLE SETS THE RADIUS IN MILES  iRadius = 150    LatRange =
(((cos(cdbl(iStartLat * _              3.141592653589 / 180)) * 6076.) /
5280.) * 60)    LowLatitude = istartlat - LatRange  HighLatitude =
istartlat + LatRange  LowLongitude = istartlong - LongRange
HighLongitude = istartlong + LongRange```
on 2005-12-15 05:49
```* Mark E. (removed_email_address@domain.invalid) wrote:
> Excellent!  The only thing remaining is an efficient algorithm for a search
> for all zipcodes within a given radius.

Using Ruby and SQLite3:

pabs@halcyon:~/proj/zip> ./import.rb zipcode.{csv,db}
pabs@halcyon:~/proj/zip> ./find.rb zipcode.db 22003 3
"city","state","zip","distance (mi)"
"Annandale","VA","22003","0.0"
"Springfield","VA","22161","1.62363604423677"
"Springfield","VA","22151","1.87190097838136"
"Falls Church","VA","22042","2.97362028549975"

Here's the code for each piece (also available at the URL
http://pablotron.org/files/zipfind.tar.gz):

---- import.rb ----
#!/usr/bin/env ruby

require 'rubygems' rescue nil
require 'sqlite3'

# constants
SCAN_RE =
/"(\d{5})","([^"]+)","(..)","([\d.-]+)","([\d.-]+)","([\d-]+)","(\d)"/
SQL = "INSERT INTO zips(zip, city, state, lat, long, timezone, dst)
VALUES (?, ?, ?, ?, ?, ?, ?)"
TABLE_SCHEMA = "CREATE TABLE zips (
id        INTEGER     NOT NULL PRIMARY KEY,

zip       VARCHAR(5)  NOT NULL,
city      TEXT        NOT NULL,
state     VARCHAR(2)  NOT NULL,
lat       FLOAT       NOT NULL,
long      FLOAT       NOT NULL,
timezone  INTEGER     NOT NULL,
dst       BOOLEAN     NOT NULL
);"

# handle command-line arguments
unless ARGV.size == 2
\$stderr.puts "Usage: #\$0 <csv> <db>"
exit -1
end
csv_path, db_path = ARGV

# load database, create zip table and prepared statement
db = SQLite3::Database.new(db_path)
db.query(TABLE_SCHEMA)
st = db.prepare(SQL)

# parse CSV and add each line to the database
db.transaction {
}
----------

---- find.rb ----
#!/usr/bin/env ruby

require 'rubygems'
require 'sqlite3'

MI_R = 1.15

# grab base zip code
unless ARGV.size > 1
\$stderr.puts "Usage: #\$0 <db> <zipcode> [radius]"
exit -1
end

# open database
db = SQLite3::Database.new(db_path)

# get lat/long for specified zip code
sql = "SELECT lat, long FROM zips WHERE zip = ?"
src_lat, src_long = db.get_first_row(sql, src_zip).map { |v| v.to_f }

unless src_lat && src_long
\$stderr.puts "Unknown zip code '#{src_zip}'"
exit -1
end

# calculate min/max lat/long
ret, range = [], radius / 69.0

# get all codes within given rectangle
sql = "SELECT lat, long, city, state, zip
FROM zips
WHERE lat > ? AND lat < ?
AND long > ? AND long < ?"
args = [src_lat - range, src_lat + range,
src_long - range, src_long + range]

db.prepare(sql).execute(*args).each do |row|
# get row values, convert lat/long to floats
dst_lat, dst_long, dst_zip, dst_city, dist_st  = row
dst_lat, dst_long = dst_lat.to_f, dst_long.to_f

# calculate distance between zip codes.  if dst_zip is within the
d = Math.sqrt((dst_lat - src_lat) ** 2 + (dst_long - src_long) ** 2)
ret << [dst_zip, dst_city, dist_st, d * 69.0] if d <= range
end

# sort results by distance
ret = ret.sort { |a, b| a[-1] <=> b[-1] }

# print out results as a CSV
puts '"city","state","zip","distance (mi)"',
ret.map { |row| '"' << row.join('","') << '"' }
----

> I suppose one technique might be to first narrow the databse search within a
> given a given square latitude/longitude range and then filter those results
> by testing that they are within the given circle radius

That's all the code above does.  There's some room for optimization
there; for example, you could create a region field, then calculate list
of regions that intersect with the search radius.  If you index on the
region field, then the query becomes essentially an index lookup instead
of a lat/long comparison (you still have to do the second distance
calculation, of course).

Anyway, I didn't do that because the code above runs pretty quickly on
my machine.```
on 2005-12-15 06:01
```Excellent!  You beat me to it.  My approach to import was somewhat

require 'csv'
require 'dbi'

Catalog=USZipCodes;User Id=test;Password=test") do | dbh |

sql = "INSERT INTO ZipData (zipcode, city, state, latitude,
longitude,
timezone, dst) VALUES (?, ?, ?, ?, ?, ?, ?)"
dbh.prepare(sql) do | sth |
begin
rdr = CSV.open("zipcode.csv", "r")
rdr.each do |row|
sth.execute(row[0], row[1], row[2], row[3], row[4], row[5],
row[6])
end
ensure
CSV.close unless CSV.nil?
end
end
end```
on 2005-12-15 15:42
```On Wednesday 14 December 2005 10:46 pm, Paul D. wrote:

>   pabs@halcyon:~/proj/zip> ./find.rb zipcode.db 22003 3

So where does one find zipcode.db?

SteveT

Steve L.
http://www.troubleshooters.com
on 2005-12-15 19:55
```> So where does one find zipcode.db?

In an earlier post Dan D. shared this:

There is a 40,000+ zip code database in CivicSpace labs that has lat
and long by zip code:

http://civicspacelabs.org/releases/zipcodes/zipcod...```
on 2005-12-15 20:19
```CivicSpaceLabs have that zip code file of about 40,000 zips. Commercial
packages and the USPS sell zip code programs and database that are over
twice that large. I believe the CivicSpaceLabs zip code database comes
out of the US Census Bureau. The 4GuysFromRolla article previously given
gave a url to the Gazetterr which is broken - I think this is the
correct url:

http://www.census.gov/geo/www/gazetteer/gazette.html
http://www.census.gov/tiger/tms/gazetteer/zips.txt
http://www.census.gov/tiger/tms/gazetteer/zips.zip

Maybe will will see a geo-tagging based ruby quiz in the future ...```
on 2005-12-16 00:46
```* Steve L. (removed_email_address@domain.invalid) wrote:
> On Wednesday 14 December 2005 10:46 pm, Paul D. wrote:
>
> >   pabs@halcyon:~/proj/zip> ./find.rb zipcode.db 22003 3
>
> So where does one find zipcode.db?

It's generated from the zipcode CSV pasted in a previous email.

That's what the "./import.rb zipcode.{csv,db}" line does; imports the
contents of the CSV into the database.

Incidentally, I also wrote a quick script to calculate the distance
between two zip codes.  It works the same as the others:

pabs@halcyon:~/proj/zip/zipfind> ./len.rb ./zipcode.db 22003 97405
3187.72 miles

I packaged all of them up at the following URL:

http://pablotron.org/files/zipfind-0.2.tar.gz

Here's the OpenPGP signature for that tarball:

http://pablotron.org/files/zipfind-0.2.tar.gz.asc

Hope that helps.```
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