Description Usage Format Source References

Polygon-based reference data used by Stage and Crookston (2007) to demonstrate partitioning of error components and related statistics. Observations are summaries of data collected on forest stands (ploygons).

1 |

A data frame with 847 rows and 29 columns:

Ground based measurements of trees (Y-variables):

`TopHt`

Height of tallest trees (ft)`LnVolL`

Log of the volume*(ft^3/acre)*of western larch`LnVolDF`

Log of the volume*(ft^3/acre)*of Douglas-fir`LnVolLP`

Log of the volume*(ft^3/acre)*of lodgepole pine`LnVolES`

Log of the volume*(ft^3/acre)*of Engelmann spruce`LnVolAF`

Log of the volume*(ft^3/acre)*of alpine fir`LnVolPP`

Log of the volume*(ft^3/acre)*of ponderosa pine`CCover`

Canopy cover (percent)

Geographic Location, Slope, and Aspect (X-variables):

`utmx`

UTM easting at plot center`utmy`

UTM northing at plot center`elevm`

Mean elevation (ft) above sea level over plot`eevsqrd`

*(elevm-1600)^2*`slopem`

Mean slope (percent) over plot`slpcosaspm`

Mean of slope (proportion) times the cosine of aspect (see Stage (1976) for description of this transformation)`slpsinaspm`

Mean of slope (proportion) times the sine of aspect

Additional X-variables:

`ctim`

Mean of slope curviture over pixels in stand`tmb1m`

Mean of LandSat band 1 over pixels in stand`tmb2m`

Mean of LandSat band 2 over pixels in stand`tmb3m`

Mean of LandSat band 3 over pixels in stand`tmb4m`

Mean of LandSat band 4 over pixels in stand`tmb5m`

Mean of LandSat band 5 over pixels in stand`tmb6m`

Mean of LandSat band 6 over pixels in stand`durm`

Mean of light duration over pixels in stand`insom`

Mean of solar insolation over pixels in stand`msavim`

Mean of AVI for pixels in stand`ndvim`

Mean of NDVI for pixels in stand`crvm`

Mean of slope curviture for pixels in stand`tancrvm`

Mean of tangent curvature for pixels in stand`tancrvsd`

Standard deviation of tangent curvature for pixels in stand

USDA Forest Service

Stage, A.R.; Crookston, N.L. 2007. Partitioning error components
for accuracy-assessment of near neighbor methods of imputation.
*For. Sci.* 53(1):62-72 http://www.treesearch.fs.fed.us/pubs/28385

Stage, A.R. (1976). An expression for the effect of aspect, slope, and
habitat type on tree growth. *For. Sci.* 22(4):457-460.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.