landsat {rsae}

LANDSAT Data: Prediction of County Crop Areas Using Survey and Satellite Data

Description

The landsat data is a compilation of survey and satellite data from Battese et al. (1988). It consists of data on segments (primary sampling unit; 1 segement approx. 250 hectares) under corn and soybeans for 12 counties in north-central Iowa.

Usage

data(landsat)

Format

A data frame with 37 observations on the following 10 variables.

SegmentsInCounty

number of segments per county.

SegementID

sample segment identifier (per county).

HACorn

hectares of corn for each sample segment (as reported in the June 1978 Enumerative Survey).

HASoybeans

hectares of soybeans for each sample segment (as reported in the June 1978 Enumerative Survey).

PixelsCorn

number of pixels classified as corn for each sample segment (LANDSAT readings).

PixelsSoybeans

number of pixels classified as soybeans for each sample segment (LANDSAT readings).

MeanPixelsCorn

county-specific mean number of pixels classified as corn.

MeanPixelsSoybeans

county-specific mean number of pixels classified as soybeans.

outlier

outlier indicator; observation number 33 is flagged as outlier.

CountyName

county names (factor variable): Cerro Gordo, Hamilton, Worth, Humboldt, Franklin, Pocahontas, Winnebago, Wright, Webster, Hancock, Kossuth, Hardin.

Details

The landsat data in Battese et al. (1988) is a compilation of the LANDSAT satellite data from the U.S. Department of Agriculture (USDA) and the 1978 June Enumerative Survey.

Survey data

The survey data on the areas under corn and soybeans (reported in hectares) in the 37 segments of the 12 counties (north-central Iowa) have been determined by USDA Statistical Reporting Service staff, who interviewed farm operators. A segment is about 250 hectares.

Satellite data

For the LANDSAT satellite data, information is recorded as "pixels". A pixel is about 0.45 hectares. The USDA has been engaged in research toward transforming satellite information into good estimates of crop areas at the individual pixel and segments level. The satellite (LANDSAT) readings were obtained during August and September 1978.

Data for more than one sample segment are available for several counties (i.e., unbalanced data).

Observations No. 33 has been flaged as outlier; see Battese et al. (1988, p. 28).

Source

The landsat data is from Table 1 of Battese et al. (1988, p. 29).

References

Battese, G. E., Harter, R. M., and W.A. Fuller (1988). An error component model for prediction of county crop areas using. Journal of the American Statistical Association 83, 28–36. doi:10.2307/2288915

See Also

landsat_means

Examples

head(landsat)