OVCCoordenadas Web Service"
In CatastRo: Interface to the API 'Sede Electronica Del Catastro'

CatastRo allows to query the OVCCoordenadas Web Service provided on Sede electrónica del Catastro API directly through a R IDE.

This API is used to retrieve the spatial coordinates of a urban property, moreover it is not needed to be the owner to get the information, actually it is enough to know the cadastral reference (RC) of the property and its address (in fact, it is only completely compulsory to know the RC, however, to ensure a good result from the response and to avoid mistakes in the RC, the address can be passed to the query too).

Secondly, the API can be used to obtain a RC of a urban property, for this information, the API asks for the longitude and the latitude. Furthermore, it allows to choose the spacial reference system (SRS, also known as CRS) between a list of them to express the coordinates.

Finally, the API tackles the issue of not knowing the exact point which the urban property has been registered. In this case, it will return all the properties located in a square 50-meters-side around the given point.

The documentation of this API can be found here.

These functions are named catr_ovc_* and returns a tibble, as provided by the package tibble.

CatastRo API

The OVCCoordenadas Web Service can be reached using the following functions:

catr_ovc_get_rccoor()
catr_ovc_get_rccoor_distancia()
catr_ovc_get_cpmrc()

Reverse Geocoding Cadastral References

The function catr_ovc_get_rccoor() receives the coordinates (lat and lon) and the spatial reference system (srs) used to express them. The return is a tibble with the cadastral reference of the property in that spatial point, including also other information as the address (town street and number).

result <- catr_ovc_get_rccoor(
  lat = 38.6196566583596,
  lon = -3.45624183836806,
  srs = "4230"
)

|refcat |address |pc.pc1 |pc.pc2 | geo.xcen| geo.ycen|geo.srs |ldt | |:--------------|:----------------------------------------------------------------------------------------------------|:-------|:-------|---------:|--------:|:---------|:----------------------------------------------------------------------------------------------------| |13077A01800039 |DS DISEMINADO Polígono 18 Parcela 39 000100200VH67C EL TIRADERO. SANTA CRUZ DE MUDELA (CIUDAD REAL) |13077A0 |1800039 | -3.456242| 38.61966|EPSG:4230 |DS DISEMINADO Polígono 18 Parcela 39 000100200VH67C EL TIRADERO. SANTA CRUZ DE MUDELA (CIUDAD REAL) |

The function accept as a srs argument the following values:

data(catr_srs_values)

# OVC valid codes
library(dplyr)

catr_srs_values %>%
  filter(ovc_service == TRUE) %>%
  select(SRS, Description) %>%
  knitr::kable()

| SRS|Description | |-----:|:----------------------| | 4230|Geográficas en ED 50 | | 4258|Geográficas en ETRS89 | | 4326|Geográficas en WGS 80 | | 23029|UTM huso 29N en ED50 | | 23030|UTM huso 30N en ED50 | | 23031|UTM huso 31N en ED50 | | 25829|UTM huso 29N en ETRS89 | | 25830|UTM huso 30N en ETRS89 | | 25831|UTM huso 31N en ETRS89 | | 32627|UTM huso 27N en WGS 84 | | 32628|UTM huso 28N en WGS 84 | | 32629|UTM huso 29N en WGS 84 | | 32630|UTM huso 30N en WGS 84 | | 32631|UTM huso 31N en WGS 84 |

It is also possible to get all the cadastral references in a square of 50-meters' side centered in the coordinates lat and lon through the function catr_ovc_get_rccoor_distancia().

catr_ovc_get_rccoor_distancia(
  lat = 40.96002,
  lon = -5.663408,
  srs = "4230"
) %>%
  knitr::kable()

| geo.xcen| geo.ycen|geo.srs |refcat |address |cmun_ine |pc.pc1 |pc.pc2 |dt.loine.cp |dt.loine.cm |dt.lourb.dir.cv |dt.lourb.dir.pnp |ldt |dis | |---------:|--------:|:---------|:--------------|:-----------------------------------------------|:--------|:-------|:-------|:-----------|:-----------|:---------------|:----------------|:-----------------------------------------------|:-----| | -5.663408| 40.96002|EPSG:4230 |5877501TL7357F |AV REYES DE ESPAÑA 1 SALAMANCA (SALAMANCA) |37274 |5877501 |TL7357F |37 |274 |643 |1 |AV REYES DE ESPAÑA 1 SALAMANCA (SALAMANCA) |21.81 | | -5.663408| 40.96002|EPSG:4230 |5778706TL7357H |AV REYES DE ESPAÑA 2 N2-4 SALAMANCA (SALAMANCA) |37274 |5778706 |TL7357H |37 |274 |643 |2 |AV REYES DE ESPAÑA 2 N2-4 SALAMANCA (SALAMANCA) |23.18 |

Geocoding a Cadastral Reference

The opposite query is possible as well. Being given to the function catr_ovc_get_cpmrc() a cadastral reference (rc), the province (province) and the town (municipality), catr_ovc_get_cpmrc() returns its coordinates lat and lon in a particular srs besides the address (town, street and number).

catr_ovc_get_cpmrc(
  rc = "13077A01800039",
  srs = "4230",
  province = "CIUDAD REAL",
  municipality = "SANTA CRUZ DE MUDELA"
) %>%
  knitr::kable()

| xcoord| ycoord|refcat |address |pc.pc1 |pc.pc2 |geo.xcen |geo.ycen |geo.srs |ldt | |---------:|--------:|:--------------|:----------------------------------------------------------------------------------------------------|:-------|:-------|:-----------------|:----------------|:---------|:----------------------------------------------------------------------------------------------------| | -3.456242| 38.61966|13077A01800039 |DS DISEMINADO Polígono 18 Parcela 39 000100200VH67C EL TIRADERO. SANTA CRUZ DE MUDELA (CIUDAD REAL) |13077A0 |1800039 |-3.45624183836806 |38.6196566583596 |EPSG:4230 |DS DISEMINADO Polígono 18 Parcela 39 000100200VH67C EL TIRADERO. SANTA CRUZ DE MUDELA (CIUDAD REAL) |

Neither the province nor municipality are required to be passed to the function, unless the argument municipality is not NULL, in that case the argument province is needed to be passed. If it is passed a value to the province argument while the municipality argument is NULL, the function catr_ovc_get_cpmrc() will throw a message and would return a tibble with no data.

catr_ovc_get_cpmrc(
  rc = "13077A01800039",
  municipality = "SANTA CRUZ DE MUDELA"
) %>%
  knitr::kable()
#> Error code: 11. LA PROVINCIA ES OBLIGATORIA

|refcat |geo.srs | |:--------------|:---------| |13077A01800039 |EPSG:4326 |

When using only rc the result is provided as expected:

# No warning, get the result
catr_ovc_get_cpmrc(rc = "13077A01800039") %>%
  knitr::kable()

| xcoord| ycoord|refcat |address |pc.pc1 |pc.pc2 |geo.xcen |geo.ycen |geo.srs |ldt | |---------:|--------:|:--------------|:----------------------------------------------------------------------------------------------------|:-------|:-------|:-----------------|:----------------|:---------|:----------------------------------------------------------------------------------------------------| | -3.457532| 38.61843|13077A01800039 |DS DISEMINADO Polígono 18 Parcela 39 000100200VH67C EL TIRADERO. SANTA CRUZ DE MUDELA (CIUDAD REAL) |13077A0 |1800039 |-3.45753233627867 |38.6184314024661 |EPSG:4326 |DS DISEMINADO Polígono 18 Parcela 39 000100200VH67C EL TIRADERO. SANTA CRUZ DE MUDELA (CIUDAD REAL) |