(default; detailed soil map) or "STATSGO"
(general soil map).
+
+
extract
Logical. Extract ZIP files to exdir
? Default: TRUE
@@ -118,6 +123,7 @@ Value
Details
To specify the Soil Survey Areas you would like to obtain data you use a WHERE
clause for query of sacatalog
table such as areasymbol = 'CA067'
, "areasymbol IN ('CA628', 'CA067')"
or areasymbol LIKE 'CT%'
.
+When db="STATSGO"
the WHERE
argument is not supported. Allowed areasymbols
include "US"
and two-letter state codes e.g. "WY"
for the Wyoming general soils map.
Pipe-delimited TXT files are found in /tabular/ folder extracted from a SSURGO ZIP. The files are named for tables in the SSURGO schema. There is no header / the files do not have column names. See the Soil Data Access Tables and Columns Report: https://sdmdataaccess.nrcs.usda.gov/documents/TablesAndColumnsReport.pdf for details on tables, column names and metadata including the default sequence of columns used in TXT files. The function returns a try-error
if the WHERE
/areasymbols
arguments result in
Several ESRI shapefiles are found in the /spatial/ folder extracted from a SSURGO ZIP. These have prefix soilmu_
(mapunit), soilsa_
(survey area), soilsf_
(special features). There will also be a TXT file with prefix soilsf_
describing any special features. Shapefile names then have an a_
(polygon), l_
(line), p_
(point) followed by the soil survey area symbol.