How We Measure the
Value of Land
Twelve biophysical measurements from satellites, weather stations, and census data flow into
seven financial pipelines. Each variable is grounded in peer-reviewed science and applied
cell by cell across MALT's 58,768 acres at 64-meter resolution — 57,840 individual measurements across 12 months.
These are the numbers behind the $90.1M/yr — $3,790/ha ($1,534/acre) — and why they change every month.
A Word on What This Is — and What It Is Not
The word methodology carries weight. It implies rigor. We use it deliberately, but also honestly:
what you see here is scaffolding — a structured framework for measuring ecological value,
not a finished building. These numbers are only as trustworthy as the data that feeds them, and right now,
that data comes from a single source: satellite imagery interpreted through models we built ourselves.
That is not enough. A single data stream can be noisy, biased, or simply wrong — clouds blind optical
sensors, algorithms carry assumptions, and models are approximations of reality, never reality itself. We know this.
This is why we are building an oracle. Not a single pipeline, but 3–5 independent data streams
that must all agree before a value is recorded as truth:
800 km
Satellite
Sentinel-2, MODIS, ECOSTRESS
120 m
Drones
Multispectral, LiDAR, cm resolution
▼ convergence ▼
In-situ
Soil Sensors
IoT probes, moisture, carbon
Autonomous
Ground Robotics
Sample collection, terrain mapping
Laboratory
Lab Analysis
Soil assays, tissue tests
▼ convergence ▼
AI Computation
Cross-validates all streams, flags divergence
Human Stewards
Local knowledge, the final word
Drones went from military hardware to sub-$500 multispectral cameras in under a decade.
Ground robotics is on the same curve — autonomous units that walk a ranch, collect samples,
and return data without human intervention. As these tools get cheaper, the oracle gets denser,
and the distance between measurement and ground truth shrinks toward zero.
Each data point must correlate with the others. When satellite NDVI says the land is healthy,
the soil sensors should confirm it. When the model says carbon is being sequestered, the lab assay
should show rising organic matter. When all five streams converge on the same answer, we have something
approaching truth. When they diverge, we have a signal to investigate — not to paper over.
The formulas below are the scaffolding. The oracle is what makes them honest.
We publish this methodology not because it is finished, but because transparency is the only
foundation worth building on.
The Yearly Picture
12 monthly Sentinel-2 satellite scans, January – December 2025. Real CDEC rain gauge data, MVC NDVI compositing. One snapshot lies. A full year tells the truth.
Data loading — 0 of 12 months complete. The sweep is still running.
From Satellite to Dollar
How raw data becomes ecosystem value
Sentinel-2 + MODISSatellite imagery
→
12 MeasurementsBiophysical inputs
→
7 PipelinesFinancial valuation
→
57,840 Cells × 12 MonthsPer-cell ESV ledger
→
$90.1M/yr$3,790/ha · $1,534/ac
How many tons of carbon dioxide this land pulls from the atmosphere each year. Trees, grasses, and soil microbes absorb CO₂ and lock it into organic matter. Healthy oak woodland sequesters about
3.5 tons per hectare per year. Pavement sequesters zero — and actually leaks carbon as buried soil slowly decomposes.
Value = sequestration rate × $190 (Social Cost of Carbon, EPA 2024)
MALT: The Marin Carbon Project measured ~1 tC/ha/yr on rangeland, higher in oak woodlands. Across 58,768 acres, this produces $4.4M/yr in carbon value (5% of total). These easements have been sequestering carbon for 45 years — the soil is a bank that grows richer every season.
Total rainfall the land receives in a year, in millimeters. This is the raw water input. What matters financially is what happens to this rain — does the land filter it into clean groundwater, or does it bounce off pavement as toxic runoff?
Precipitation minus evapotranspiration = net water yield.
MALT: West Marin receives ~900 mm/yr in a Mediterranean climate — winter-wet, summer-dry. This rainfall feeds the Marin Municipal Water District and recharges the aquifers that 100,000+ residents depend on. The land filters it for free.
Water that plants breathe back into the air through their leaves. This is nature's air conditioning — every liter evaporated absorbs heat energy and cools the surroundings. High ET means the land is
actively cooling itself and filtering water through roots. This one number connects the water pipeline to the cooling pipeline.
MALT: The oak and bay laurel canopy across MALT easements drives high ET, acting as natural air conditioning for communities from Novato to Point Reyes. This dual service — water filtration and cooling — is why MALT's water pipeline reaches $11.7M/yr (13%), peaking in wet winter months when rainfall exceeds evapotranspiration.
What it costs your local utility to clean and deliver one cubic meter of water. This is the
replacement cost — if the land wasn't filtering water for free, someone would have to pay to do it artificially. Ranges from $0.50 in rural areas to $3+ near cities.
MALT: Marin Municipal Water District (MMWD) rates are among the highest in California. The watershed that feeds their reservoirs runs directly through MALT easements. Every acre of protected rangeland and forest is a water treatment plant that never sends a bill.
How much hotter or cooler this land is compared to the regional baseline, measured by satellite infrared sensors. Forests are typically
4°C cooler than bare ground. Downtown concrete can be 8°C hotter. This directly drives electricity costs and health outcomes.
MALT: Satellite thermal data shows MALT easements are consistently 3–5°C cooler than developed areas in Novato and San Rafael. This cooling effect extends well beyond the easement boundaries, reducing AC demand for surrounding communities and contributing $29.7M/yr in cooling value (33% of total — the largest single pipeline).
The percentage of land covered by buildings with roofs and HVAC systems. This determines how much of the heat island penalty translates into
actual electricity bills. A parking lot is hot but has no AC units. A downtown block at 60% building footprint means 60% of that heat is being fought with air conditioning.
Cooling cost = 0.7 kWh/m²/°C × heat delta × building % × electricity rate
MALT: Building footprint on conservation easements is effectively 0%. That's the entire point of a conservation easement — removing the right to develop. This keeps the cooling pipeline firmly positive instead of becoming an energy liability.
Local price per kilowatt-hour. This multiplier turns excess heat into dollars. The same heat island costs more in California than in Texas. It's the bridge between
a physical measurement and a financial liability.
MALT: PG&E rates in Marin County average ~$0.37/kWh — among the highest in the nation. This means every degree of cooling that MALT lands provide is worth significantly more here than almost anywhere else in the country. Geography and energy policy amplify the value of conservation.
The single most important number. Percentage of land sealed by concrete, asphalt, or buildings. This is the master switch — it flips almost every pipeline from positive to negative. Above 50% impervious, water becomes a liability, biodiversity drops to zero, soil stops forming, and health costs appear. Downtown LA is 95% impervious. A forest is 0%. This one measurement explains most of the $80,000/ha gap between them.
MALT: Conservation easements are 0–5% impervious. The legal protection of these easements guarantees that the master switch stays in the positive position — permanently. This is what makes MALT's model so powerful: they didn't just protect land for a season. They removed the right to destroy it. All seven pipelines stay positive, every year, forever.
People per square kilometer. This is the
exposure multiplier. A hot parking lot in the desert hurts nobody. The same heat in a dense city sends thousands to the ER. Population density doesn't change what the land does — it changes how many people are affected by it.
MALT: Population density on the easements themselves is low (~17/km²). But the communities adjacent to MALT land — Novato, San Rafael, Petaluma — are home to over 100,000 people who directly benefit from the clean air, clean water, and cooler temperatures. The health pipeline captures $11.8M/yr (13%) of that value.
NDVI is a satellite index measuring how green and alive the land is (0 = bare, 1 = dense vegetation).
Variance — how much the greenness changes through seasons — is a proxy for biological diversity. A monoculture has high NDVI but low variance. A mixed woodland has high variance because different species leaf out at different times, creating year-round habitat niches. More niches = more species = higher ecological value.
MALT: This is exactly why we run 12 monthly Sentinel-2 scans instead of one. MALT's mix of oak woodland, coastal scrub, wetlands, and rangeland produces high seasonal NDVI variance — a direct signal of biodiversity. The 13,079 acres of forest and 647 acres of wetlands across these easements contribute $10.5M/yr in biodiversity value (12%).
From the Universal Soil Loss Equation (USLE). Ranges from 0 (full cover, no erosion) to 1.0 (bare soil, maximum erosion). Dense forest = 0.01. Bare construction site = 1.0. This tells you how well the land
holds its soil in place. Erosion isn't just losing dirt — it's losing the carbon, nutrients, and water-holding capacity that took centuries to build.
Soil value = (1 − C-factor) × $800/ha/yr
MALT: Dense perennial grassland and oak cover across the easements give a C-factor of 0.01–0.05. The 34,155 acres of rangeland are permanently protected from conversion, holding soil that took millennia to form. Soil retention value: $17.5M/yr (19%).
The economic value of wild pollinators supported by this habitat for surrounding agriculture. Land next to almond orchards in California's Central Valley could be worth $1,000+/ha in pollination alone. This is a direct input because it depends entirely on what crops are nearby.
MALT: West Marin's working ranches and farms depend on native pollinators that nest and forage in the wildlands protected by MALT easements. Unlike industrial agriculture that trucks in honeybee colonies, this is a self-sustaining pollination economy — worth $4.5M/yr (5%).
How They Connect
Impervious surface is the master switch. MALT keeps it near 0% on every easement. That single fact guarantees all seven pipelines stay positive — permanently. This is the structural genius of the conservation easement: remove the right to destroy, and every ecological service follows.
Evapotranspiration links water and cooling. MALT's oak canopy breathes water into the air, simultaneously filtering groundwater for MMWD reservoirs and cooling the air for surrounding communities. One biological process, two financial pipelines, $41M+ combined (46% of total ESV).
Population density is the beneficiary multiplier. MALT easements sit next to 100,000+ people in Novato, San Rafael, and Petaluma. Every degree of cooling, every liter of filtered water, every breath of cleaner air reaches far beyond the fence line.
Carbon works on deep time. The Marin Carbon Project showed that compost application on rangeland increases soil carbon by ~1 tC/ha/yr. But the soil carbon stock these easements protect took millennia to accumulate. Lose the soil and you lose the carbon capacity permanently.
The 12-month average captures what a single snapshot misses. January NDVI in Marin looks radically different from August. Winter rains drive green-up; summer drought turns grasslands golden. A single scan would overvalue or undervalue by tens of millions. Twelve scans tell the truth.
