These files contain the laboratory analysis of the soil samples taken during the Sonora
2007 Field Campaign in the Rio Sonora/San Miguel (NSF IRES project).

Four files are included:

1. Excel Spreadsheet containing all the data (SonoraSoilsAnalysis2007.xls)
2. Text file with Surface Samples (SonoraSoilsAnalysis_SurfaceSamples2007.txt)
3. Text file with Soil Pits (SonoraSoilsAnalysis_SoilPits2007.txt)
4. Text file with Station Samples (SonoraSoilsAnalysis_Stations2007.txt)

All files have ID, X, Y, Z, Soil Texture, Bulk Density, % Sand, % Silt, % Clay, %LOI

The X,Y,Z are in UTM zone 12 N, WGS84 Datum with elevation in meters.

Soil texture and bulk density (g/cm3) are derived from percentages of each particle size using 
U.S.D.A Soil Texture Triangle. Calculations are performed using: http://www.pedosphere.com/resources/bulkdensity/worktable_us.cfm

Measured PSDA (Particle Size Distribution Analysis) are based on corrected laboratory samples 
performed by Whitney Defoor with help from Luis Mendez and Enrique Vivoni at New Mexico Tech. 
Calculated PSDA values have certain issues related to their derivation. When possible, use of 
Measured PSDA is preferred over Calculated PSDA. 


