Sample tree growth data with locations

This file provides measurements of annual radial growth for randomly distributed adult trees in the Rocky Mountains of the United States. Measurements were derived from increment cores collected in 2012 and 2013. A total of 5 tree species were sampled. Sample trees were distributed across a latitudinal gradient from the southern terminus of the Rockies in New Mexico to the Canadian border in the north. Target tree species include: Abies lasiocarpa (subalpine fir), Picea engelmannii (Engelmann spruce), Pinus contorta (lodgepole pine), Pinus ponderosa (ponderosa pine) and Pseudotsuga menziesii (Douglas-fir). Annual radial increment over a 20 year period was measured in millimeters for each sample tree. File headings include:

Sample tree ID: Identification code for the sample or target tree
Species: Species of the sample tree
Year: The year of growth
Site: General location of sample tree
Longitude and Latitude: Geographical coordinates of sample (based on North American Datum 1983)
Elevation: Elevation above sea level in meters
Aspect: Dominant terrain aspect in degrees from north
Terrain slope: Average slope of land surface measured in percent
Stem diameter: Diameter of tree stem at breast height (1.3 meters above root crown) in year of growth measured in centimeters
Age: Age of sample in year of growth
Ring width: Measured width of annual radial increment in millimeters
Date collected: Month, day, and year the sample was collected