Geoparsing text using the geoparser.io API

In geoparser: Interface to the Geoparser.io API for Identifying and Disambiguating Places Mentioned in Text

NOT_CRAN <- identical(tolower(Sys.getenv("NOT_CRAN")), "true")
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  purl = NOT_CRAN,
  eval = NOT_CRAN
)

What is geoparsing?

According to Wikipedia, geoparsing is the process of converting free-text descriptions of places (such as "Springfield") into unambiguous geographic identifiers (such as lat-lon coordinates). A geoparser is a tool that helps in this process. Geoparsing goes beyond geocoding in that, rather than analyzing structured location references like mailing addresses and numerical coordinates, geoparsing handles ambiguous place names in unstructured text.

Geoparser.io works best on complete sentences in English. If you have a very short text, such as a partial address like "Auckland New Zealand," you probably want to use a geocoder tool instead of a geoparser. In R, you can use the opencage package for geocoding!

How to use the package

You need to input a text whose size is less than 8KB.

library("geoparser")
output <- geoparser_q("I was born in Vannes and I live in Barcelona")

The output is list of 2 data.frames (dply::tbl_dfs). The first one is called properties and contains

• the api version called apiVersion

• the source of the results

• the id of the query

• text_md5 is the MD5 hash of the text that was sent to the API.

output$properties

The second data.frame contains the results and is called results:

knitr::kable(output$results)

• country is the ISO-3166 2-letter country code for the country in which this place is located, or NULL for features outside any sovereign territory.

• confidence is a confidence score produced by the place name disambiguation algorithm. Currently returns a placeholder value; subject to change.

• name is the best name for the specified location, with a preference for official/short name forms (e.g., "New York" over "NYC," and "California" over "State of California"), which may be different from exactly what appears in the text.

• admin1 is a code representing the state/province-level administrative division containing this place. (From GeoNames.org: "Most adm1 are FIPS codes. ISO codes are used for US, CH, BE and ME. UK and Greece are using an additional level between country and fips code. The code '00' stands for general features where no specific adm1 code is defined.").

• type is a text description of the geographic feature type — see for a complete list. Subject to change.

• geometry.type is the type of the geographical feature, e.g. "Point".

• longitude is the longitude.

• latitude is the latitude.

• reference1 is the start (index of the first character in the place reference) -- each reference to this place name found in the input text is on one distinct line.

• reference2 the end (index of the first character after the place reference) -- each reference to the place name found in the input text is on one distinct line.

• text_md5 is the MD5 hash of the text that was sent to the API.

You can input a vector of characters since the function is vectorized. This is the case where the MD5 hash of each text can be useful for further analysis.

library("geoparser")
output_v <- geoparser_q(text_input = c("I was born in Vannes but I live in Barcelona.",
"France is the most beautiful place in the world.", "No place here."))
knitr::kable(output_v$results)
knitr::kable(output_v$properties)

How does it work?

The API uses the Geonames.org gazetteer data. Geoparser.io uses a variety of named entity recognition tools to extract location names from the raw text input, and then applies a proprietary disambiguation algorithm to resolve location names to specific gazetteer records.

What happens if the same place occurs several times in the text?

If the input text contains several times the same placename, there is one line for each repetition, the only difference between lines being the values of reference1 and reference2.

output2 <- geoparser_q("I like Paris and Paris and Paris and yeah it is in France!")
knitr::kable(output2$results)

What happens if there are no results for the text?

In this case the results table is empty.

output_nothing <- geoparser_q("No placename can be found.")
output_nothing$results

How well does it work?

The API team has tested the API un-scientifically and noticed a performance similar to other existing geoparsing tools. A scientific evaluation is under way. The public Geoparser.io API works best with professionally-written, professionally-edited news articles, but for Enterprise customers the API team says that it can be tuned/tweaked for other kinds of input (e.g., social media).

Let's look at this example:

output3 <- geoparser_q("I live in Hyderabad, India. My mother would prefer living in Hyderabad near Islamabad!")
knitr::kable(output3$results)

Geoparser.io typically assumes two mentions of the same name appearing so closely together in the same input text refer to the same place. So, because it saw "Hyderabad" (India) in the first sentence, it assumes "Hyderabad" in the second sentence refers to the same city. Also, "Islamabad" is an alternate name for Chittagong, which has a higher population than Islamabad (Pakistan) and is closer to Hyderabad (India).

Here is another example with a longer text.

text <- "Aliwagwag is situated in the Eastern Mindanao Biodiversity \
Corridor which contains one of the largest remaining blocks of tropical lowland \
rainforest in the Philippines. It covers an area of 10,491.33 hectares (25,924.6 \
acres) and a buffer zone of 420.6 hectares (1,039 acres) in the hydrologically \
rich mountainous interior of the municipalities of Cateel and Boston in Davao \
Oriental as well as a portion of the municipality of Compostela in Compostela \
Valley. It is also home to the tallest trees in the Philippines, the Philippine \
rosewood, known locally as toog. In the waters of the upper Cateel River, a rare \
species of fish can be found called sawugnun by locals which is harvested as a \
delicacy." 

output4 <- geoparser_q(text)
knitr::kable(output4$results)

What can I do with the results?

You might want to map them using leaflet or ggmap or anything you like. The API website provides suggestions of use for inspiration.

Meta

• Please report any issues or bugs.
• License: GPL
• Get citation information for geoparser in R doing citation(package = 'geoparser')
• Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

geoparser documentation built on July 27, 2019, 1:02 a.m.