NMR instrument for soil moisture ground-truth data collection
Abstract
Research was conducted to develop an instrument capable of measuring volumetric soil-water content using nuclear magnetic resonance (NMR) techniques. NMR is very attractive since it is both non-destructive and non-invasive. An NMR instrument was designed to continuously measure volumetric water content in the soil surface while moving at ground speeds of up to 17 km/h. The instrument will be used to gather ground data for calibration and verification of data collected by remote sensing instruments. This use requires a method that is relatively accurate, rapid and independent of soil type, organic matter content, texture and clay mineralogy. Calibration measurements were made on large soil samples with varying water content. The average correlation coefficient of the NMR results with the soil moisture content for six combinations of measurement depth and sensor configuration was 0.97.
- Publication:
-
ITC Journal
- Pub Date:
- 1986
- Bibcode:
- 1986ITCJ....1....9P
- Keywords:
-
- Ground Truth;
- Nuclear Magnetic Resonance;
- Remote Sensing;
- Soil Moisture;
- Calibrating;
- Correlation Coefficients;
- Data Acquisition;
- Magnets;
- Moisture Content;
- Instrumentation and Photography