Read feature field types.

Source: R/vapour_input_attributes.R

Obtains the internal type-constant name for the data attributes in a source.

vapour_report_fields(dsource, layer = 0L, sql = "")

vapour_report_attributes(dsource, layer = 0L, sql = "")

Arguments

dsource

data source name (path to file, connection string, URL)

layer

integer of layer to work with, defaults to the first (0) or the name of the layer

sql

if not empty this is executed against the data source (layer will be ignored)

Value

named character vector of the GDAL types for each field

Details

Use this to compare the interpreted versions converted into R types by vapour_read_fields.

This and vapour_read_fields() are aliased to older versions named 'vapour_report_attributes()' and 'vapour_read_attributes()', but "field" is a clearer and more sensible name (in our opinion).

These are defined for the enum OGRFieldType in GDAL itself. https://gdal.org/doxygen/ogr__core_8h.html#a787194bea637faf12d61643124a7c9fc

Examples

file <- "list_locality_postcode_meander_valley.tab"
mvfile <- system.file(file.path("extdata/tab", file), package="vapour")
vapour_report_fields(mvfile)
#>     LOCAL_ID         NAME     POSTCODE     PLAN_REF     GAZ_DATE   NOM_REG_NO 
#>    "OFTReal"  "OFTString" "OFTInteger"  "OFTString"    "OFTDate"  "OFTString" 
#>          UFI   CREATED_ON    LIST_GUID   SHAPE_AREA    SHAPE_LEN 
#>  "OFTString"  "OFTString"  "OFTString"    "OFTReal"    "OFTReal" 

## modified by sql argument
vapour_report_fields(mvfile,
  sql = "SELECT POSTCODE, NAME FROM list_locality_postcode_meander_valley")
#>     POSTCODE         NAME 
#> "OFTInteger"  "OFTString"