Accuracy of Umny Inc. Soil Thermal Conductivity Model (SoK)

Summary

The current best analytical models available for predicting Soil Thermal Conductivity can be found in“Evaluation of soil thermal conductivity models”.This chart compares the accuracy of our SoK predictor to the 3 models evaluated in that study. As you can see our model is significantly more accurate accross all soil types than the best analytical models available (and its much easier to use!).

barry-macaulay, cote and konrad, lu et al., balland and arp, soil thermal conductivity comparison

Accuracy by Soil Type

Umny SoK Soil Texture Triangle, Thermal Conductivity

Soil Texture

Soil Texture Thermal Conductivity Accuracy SoK

Sand Silt Rock Clay Thermal Conductivity SoK Umny

Sand:

More than 50% particles are USDA Sand

Silt:

More than 50% particles are USDA Silt

Clay:

More than 40% particles are USDA Clay

Loam:

None of the above apply

Saturation %

Soil Saturation Thermal Conductivity Accuracy SoK

Saturation % W/mK Thermal Conductivity SoK Umny

No Sat.:

Saturation less than 1%

Low Sat.:

Saturation between 1% and 25%

Med Sat.:

Saturation between 25% and 50%

High Sat.:

Saturation between 50% and 75%

Full Sat.:

Saturation above 75%

Rock Content

Rock Coarse Particle % vs W/mK Thermal Conductivity Accuracy SoK

Saturation % W/mK Thermal Conductivity SoK Umny

No Rocks:

No particles larger than 2mm in soil

Some Rocks:

Rocks/Coarse Particles between 0% and 50% of soil volume

Mostly Rocks:

Rocks/Coars Particles above 50% of soil volume

Organic Carbon Content

Soil Organic Carbon g/cm3 Thermal Conductivity Accuracy SoK

Organic Matter Carbon % W/mK Thermal Conductivity SoK Umny

Low Carbon:

Organic Carbon density less than 0.002 g/cm3

Med. Carbon:

Organic Carbon density between 0.002 and 0.02 g/cm3

High Carbon:

Organic Carbon density above 0.02 g/cm3

Soil Temperature

Ground Temperature Soil degrees Celcius vs thermal conductivity accuracy

Machine Learning Error ground temperature vs thermal conductivity

Warm:

Soil temperature above 1 °C

Transition Zone:

Soil temperature between 1 and -3 °C

Frozen:

Soil temperature below -3°C

Reality vs SoK: Comparison Charts

The following graphs plot the measured versus SoK predicted soil thermal conductivity values across the validation dataset.

sok accuracy in sandy soils divided by organic matter

soil thermal conductivity in sandy soils by total soil saturation

thermal conductivity measured vs predicted for silty soils by carbon levels

thermal conductivity of soil prediction accuracy for silt dry and wet

thermal conductivity accuracy by carbon, clay and rock

soil thermal conductivity clay, gravel, dry and saturated

soil thermal conductivity accuracy in loam soils by carbon content

soil k accuracy in loam vs water saturation

Umny Ground Properties AI