"Real Moisture Level" for Everyday Use

GeoDrops is designed to make complex soil physics incredibly easy for everyday users to understand. When you open the GeoDrops App, the most important piece of information to look for is simply the "Moisture Level", presented to you in plain English.  Instead of forcing you to interpret complex numbers, the GeoDrops AI translates the current state of your soil into intuitive adjectives, such as "Wet", "Moist", or "Dry".

For most average users, this is all you really need to know. You can safely ignore the underlying "soil moisture percentages" and simply rely on these descriptive adjectives to make your watering decisions. The GeoDrops AI automatically factors in your specific soil type, environmental data, and sensor readings to output an accurate adjective that reflects exactly what your plant's roots are experiencing.

Real Dominant Moisture Percent vs. Raw Depth Metrics

For power users who want to dive deeper into the data, both the GeoDrops App and the GeoDrops BigData Dashboard report the soil moisture in actual percentage values, down to two-decimal-point precision.
 

Real (Calibrated) vs Raw (Uncalibrated) Soil Moisture

The soil's real (calibrated) soil moisture is a 0% to 100% scale where the data has been AI-calibrated against your specific garden environment. On this scale, 0% represents soil that is completely dry and crumbling, while 100% indicates that the soil is fully saturated and has reached its maximum water-holding capacity.

On the other hand, Raw (uncalibrated) soil moisture bypasses the GeoDrops AI's calibration and shows the direct data coming from the sensor probes.  The value will give you a rough moisture level but it is not ideal to drive irrigation. 
 

Dominant vs Depth-Aware Soil Moisture

By default, GeoDrops shows you the "dominant" soil moisture.  It represents the predominant soil moisture for the entire root zone across the depth of the sensor probe, filtering out minor surface-level fluctuations.  This reading is useful if your plant root is equal to or deeper than the length of the probe, which is typically true for mature lawn grass, as well as most flowers and vegetables.

On the other hand, power users can also enable "depth-aware" soil moisture views. Instead of an aggregated dominant moisture reading, this feature breaks down the exact soil moisture wetness at specific underground depths — typically 1.5" (4cm), 2.5" (6.5cm), and 3.5" (9cm). This is highly useful for diagnosing isolated issues, like surface-level evaporation or poor deep drainage.

Note: An additional advantage of the "dominant" soil moisture view is that GeoDrops AI can use the entire length of the sensor probe for self-recovery against localized loose soil events, which significantly improves the soil sensor's resistance to small local soil disturbances. We highly recommend using  the "dominant" soil moisture value as much as possible, for the most stable and reliable soil moisture readings.

GeoDrops vs. Other Scientific Soil Moisture Units

For advanced users, it may be vital to understand how GeoDrops' soil moisture percentages compare to other industry-standard units. Under GeoDrops' soil moisture unit (which we call "Scaled VWC"):

• Field Capacity (FC) = 100% soil moisture

• Permanent Wilting Point (PWP) = xx% soil moisture  (typ. somewhere between 20% ~ 80%)

• Dry Soil = 0% soil moisture

Commercial-grade smart irrigation controllers typically use a soil moisture unit called "Managed Allowed Depletion" (MAD), which is impossible to calibrate in practice, since PWP cannot be measured without literally causing your plant to wilt.  Under the MAD soil moisture unit:

• FC = 100% soil moisture

• PWP = 0% soil moisture

• Dry Soil = -xx% soil moisture (below zero)

Agricultural-grade and academic papers use a soil moisture unit called "Volumetric Water Content" (VWC), which requires hours-long calibration in a well-controlled environment.  These scientific sensors typically cost over $500~$1000.  Under the VWC soil moisture unit:

• Pure Water = 100% soil moisture

• FC = xx% soil moisture  (typ. somewhere between 20% ~ 50%)

• PWP = yy% soil moisture  (typ. somewhere between 10% ~ 40%)

• Dry Soil = 0% soil moisture

Finally, to the best of our knowledge, no other consumer-grade sensor (besides GeoDrops) has any sensor calibration.  The soil moisture values reported by these sensors are simply "unitless" moisture percentages that lack any scientific meaning.

In summary, GeoDrops brings the best of all worlds. The real "dominant" soil moisture (reported in the GeoDrops App by default) acts as a "Scaled VWC" value, allowing the moisture percentage to be easily compared to MAD without tedious manual calibration. For professionals requiring traditional agricultural-grade VWC units, the Raw soil moisture makes translation possible:

• 100% GeoDrops Raw moisture  =  Roughly 40~45% actual VWC for common loamy earth soil

 
WARNING:  Always verify the soil moisture unit you are working with, as 50% soil moisture depletion (MAD) on a commercial-grade irrigation controller means something completely different than 50% VWC soil moisture on an agricultural sensor.

The Science of Field Capacity (FC)

Field Capacity (FC) represents the maximum amount of water your soil can physically retain. In the GeoDrops App, a 100% Real Moisture reading means the soil is fully saturated at this FC limit.

Watering is a delicate balancing act; exceeding Field Capacity frequently is extremely detrimental. Oversaturated soil cuts off essential oxygen to the roots, suffocating the plant and promoting harmful fungal growth. By establishing a precise 100% baseline, GeoDrops ensures you do not inadvertently push your garden into this danger zone.

Because GeoDrops uses Predictive AI algorithms and computational physics, it automatically tracks drifts in your soil's Field Capacity over time as your garden's soil density evolves. Every GeoDrops device utilizes a redundant sensor array that maintains extreme reading stability despite soil disturbance or weather fluctuations. This means the system generally avoids the complex manual recalibrations required by most commercial sensors.

Estimating the Permanent Wilting Point (PWP)

Somewhere within the 0% to 100% moisture range lies the Permanent Wilting Point (PWP) — the absolute minimum amount of moisture a plant needs to survive without wilting. Because PWP varies heavily based on soil composition and aeration, the GeoDrops AI provides an intelligent, data-backed estimate based on your soil profile response.

The underlying PWP percentages vary drastically by soil type:

• 10~40% for sandy soil

• 30~60% for aerated loamy soil

• 50~80% for compacted loamy soil

• 70~90% for aerated clay soil

• 85~95% for compacted clay soil

Fortunately, you do not need to memorize these complex threshold percentages.  The GeoDrops AI automatically identifies your soil type and maps these nuanced PWP percentages to easy-to-understand Real Moisture Level readings.

Dialing in Your Target Moisture

To set a perfect target watering routine, the most effective approach is to rely on the GeoDrops App's dominant moisture level adjectives ("Moist", "Wet", etc.) while observing how your plants physically respond over a few weeks. Once you find the moisture level and/or corresponding soil moisture percentages where your garden thrives without stress, you can lock that "sweet spot" moisture target in the GeoDrops App. GeoDrops will then monitor and/or maintain this moisture level for you across all weather conditions.

Generally, your target should sit comfortably between the "Dry" (Permanent Wilting Point) and "Wet" (100% max moisture) thresholds. Adjust this target slightly lower for drought-tolerant plants, like roses, and higher for thirsty plants, like tomatoes.

Troubleshooting & FAQ

Below are common questions and troubleshooting insights sourced directly from our GeoDrops Community Forum.