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The reference data Note that the UK is on "exceptional reserve" for the locations (which provides the longitude and latitudes) is taken from use by the United Kingdom of Great Britain (U.S.GB) National Geospatial-Intelligence Agency's [[GEOnet Names Server]] which covers the world excluding the U.S. and AntarticaNorthern Island and is often used in its place.
The perl module (GNS.pm) loads, indexes and provides key variables from this data.==Reference Data==
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This page details the various matching techniques used to Geocode inventor locations in the NBER patent data. Geocoding inventor locations entails matching the inventor addresses provided in the patent data to known locations through-out the world and recording their longitude and latitude.
==Reference DataCountry Codes== This project uses [http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 ISO3166-1 alpha-2] two-character country codes, as recognised by the UN and (with exceptions) used for top level domains on the internet. A list of codes for the 246 recognised countries or self-governing territories is as follows: AD,AE,AF,AG,AI,AL,AM,AN,AO,AQ,AR,AS,AT,AU,AW,AX,AZ,BA,BB,BD,BE,BF,BG,BH,BI,BJ,BL,BM,BN,BO,BR,BS,BT,BV,BW,BY,BZ,CA,CC,CD,CF,CG,CH,CI,CK,CL,CM,CN,CO,CR,CU,CV,CX,CY,CZ,DE,DJ,DK,DM,DO,DZ,EC,EE,EG,EH,ER,ES,ET,FI,FJ,FK,FM,FO,FR,GA,GB,GD,GE,GF,GG,GH,GI,GL,GM,GN,GP,GQ,GR,GS,GT,GU,GW,GY,HK,HM,HN,HR,HT,HU,ID,IE,IL,IM,IN,IO,IQ,IR,IS,IT,JE,JM,JO,JP,KE,KG,KH,KI,KM,KN,KP,KR,KW,KY,KZ,LA,LB,LC,LI,LK,LR,LS,LT,LU,LV,LY,MA,MC,MD,ME,MF,MG,MH,MK,ML,MM,MN,MO,MP,MQ,MR,MS,MT,MU,MV,MW,MX,MY,MZ,NA,NC,NE,NF,NG,NI,NL,NO,NP,NR,NU,NZ,OM,PA,PE,PF,PG,PH,PK,PL,PM,PN,PR,PS,PT,PW,PY,QA,RE,RO,RS,RU,RW,SA,SB,SC,SD,SE,SG,SH,SI,SJ,SK,SL,SM,SN,SO,SR,ST,SV,SY,SZ,TC,TD,TF,TG,TH,TJ,TK,TL,TM,TN,TO,TR,TT,TV,TW,TZ,UA,UG,UM,US,UY,UZ,VA,VC,VE,VG,VI,VN,VU,WF,WS,YE,YT,ZA,ZM,ZW
The reference data for the locations (which provides the longitude and latitudes) is taken from the (U.S.) National Geospatial-Intelligence Agency's [[GEOnet Names Server | GEOnet Names Server (GNS)]] which covers the world excluding the U.S. and Antartica.
The perl module [http://www.edegan.com/repository/GNS.pm] loads, indexes and provides an interface to key variables from this data. The source code is the primary module documentation. Exported Methods include:
*new() - Constructor. Takes an ISO9660 code, calls Load
*Load() - Expects to find GNS-XX.txt (where XX is an ISO9660 code) and it to have GNS standard column names; Loads it.
*Index - Build all of master index and all sub-indices
*GetIndex() -Takes a specific GNS NT code (e.g. P,L,A) or ALL and returns an index
*GetUNIs() - Takes a place name and a type (e.g. P,L,A,ALL); returns a list of corresponding UNIs
*GetLongLat() - Takes a UNI, returns a longitude, latitude pair
==The Source And Reference Files==
Source files are currently extracted from the NBER patent data on a per country basis. The original format of the source files was:
