Key Takeaways
- Satellite imagery at 30–50 cm per pixel handles residential quoting and shade screening
- Drone photogrammetry reaches sub-centimeter resolution and builds true 3D roof models
- Outsourced drone surveys cost $150–$500 per residential site; satellite data is effectively free inside design platforms
- Commercial drone flights need a licensed pilot — FAA Part 107 in the US, EASA certification in the EU
- A 30-minute drone flight can capture a 25-acre site that takes a ground crew a week to walk
- The best workflow is hybrid: satellite for speed at quote stage, drone or on-site capture before final engineering
Quick Answer
Satellite solar site surveys win on cost and speed; drone surveys win on resolution and 3D accuracy. Use satellite imagery for residential proposals, lead qualification, and early shade screening. Use drone capture for complex roofs, heavy tree shading, commercial sites, and any design going to permit. The strongest installers run a hybrid: satellite at quote stage, drone or on-site verification before engineering sign-off.
The resolution gap is real. Commercial satellite imagery typically delivers 30 cm to 3 m per pixel, according to a Texas Natural Resources Information System photogrammetry briefing, 2022. Drone imagery from the same briefing reaches sub-centimeter resolution. Whether that gap matters depends entirely on what you are deciding with the data.
At-a-Glance Comparison Table
The table below compares satellite and drone solar site surveys across the factors that matter most to installers and sales teams.
| Factor | Satellite Survey | Drone Survey | Winner |
|---|---|---|---|
| Resolution | 30 cm–3 m per pixel | 1–5 cm per pixel | Drone |
| 3D roof model | Estimated from photogrammetry or AI inference | Measured from overlapping photos | Drone |
| Cost per site | $0–$15 (bundled in software) | $150–$500 outsourced | Satellite |
| Time per site | 5–15 minutes | 2–4 hours door to door | Satellite |
| Imagery age | Weeks to 3+ years old | Captured on demand | Drone |
| Tree and obstruction detail | Coarse canopy outline | Full 3D canopy and obstructions | Drone |
| Electrical and structural inspection | Not possible | Partial (roof only) | Neither |
| Regulatory burden | None | Pilot license, airspace rules | Satellite |
| Scalability | Unlimited sites per day | 3–8 sites per day per pilot | Satellite |
| Utility-scale mapping | Coarse | Survey-grade orthomosaics | Drone |
| Weather dependency | None at capture time | Cannot fly in rain or high wind | Satellite |
Satellite wins on six factors, drone on five. The count matters less than the weighting: for a residential sales team quoting 20 leads a week, cost and speed dominate. For a commercial EPC engineering a 2 MW rooftop, accuracy dominates.
What Is a Satellite Solar Site Survey?
A satellite solar site survey uses existing overhead imagery to measure a roof, detect obstructions, and model shading without visiting the property. The designer pulls an address inside a solar design tools platform, traces roof planes on the imagery, and runs a shade and production simulation. No truck rolls, no ladder, no flight.
In practice, most “satellite” surveys in solar software blend 3 imagery sources. True satellite imagery comes from providers like Maxar and Airbus. Aerial imagery, captured from crewed aircraft, comes from providers like Nearmap at 4.4–7 cm ground sample distance, according to Nearmap, 2024. Free basemaps from national mapping agencies fill the gaps.
How Satellite Surveys Work
The workflow takes 5–15 minutes. You enter the address, the platform loads the freshest available imagery, and you outline the roof. Software then estimates pitch and azimuth, either from pre-built 3D data or from oblique imagery. Shade analysis runs against a digital surface model or against obstructions you draw manually.
The output feeds straight into a proposal. Inside SurgePV, for example, the same survey drives the 3D model, the irradiance simulation, and the solar proposal software output. The homeowner gets a quote before a competitor has finished scheduling a site visit.
Where Satellite Surveys Fall Short
Imagery age is the biggest weakness. A basemap can be 6 months to 3 years old. New construction, a removed tree, or a fresh addition on the neighbor’s garage will not appear. Resolution is the second weakness: at 30–50 cm per pixel, a vent pipe is 1–2 pixels. You cannot measure it. You can barely see it.
Key Takeaway
Satellite surveys answer one question well: “Is this roof worth pursuing?” They answer it in minutes, at near-zero marginal cost. They do not answer “What exactly goes on this roof?” with permit-level confidence.
What Is a Drone Solar Site Survey?
A drone solar site survey flies a small unmanned aircraft over the property to capture hundreds of overlapping photos. Photogrammetry software stitches those photos into an orthomosaic (a geometrically corrected overhead image) and a 3D point cloud of the roof. The designer works from measurements, not estimates.
Resolution jumps by an order of magnitude. Where satellite pixels cover 30 cm or more, drone pixels cover 1–5 cm, according to the TNRIS photogrammetry briefing, 2022. A 10 cm vent pipe becomes a measurable object, not a smudge.
How Drone Surveys Work
A certified pilot arrives on site, checks airspace, and flies an automated grid pattern. A residential roof takes 10–20 minutes of flight time. The photos upload to processing software, which returns a 3D model and orthomosaic within minutes to hours. Tools like Scanifly, IMGING, and DroneDeploy specialize in this solar workflow.
The accuracy is survey-grade when the pilot uses ground control points or RTK (real-time kinematic) positioning. Roof plane dimensions land within 1–3% of tape-measured values in industry-observed ranges. Pitch and azimuth come out of the 3D model directly, so there is no guesswork on tilt.
Where Drone Surveys Fall Short
Cost and logistics. Every survey needs a licensed pilot, travel time, setup, flight, and processing. Weather cancels flights. Airspace restrictions near airports can block them entirely. And the drone only sees the outside: the electrical panel, the attic rafters, and the service entrance still need human eyes.
Drones also scale poorly for sales teams. One pilot realistically covers 3–8 residential sites per day. A satellite workflow covers 50 or more. If your bottleneck is lead qualification speed, drones make it worse, not better.
Image Resolution and Data Quality
Resolution decides what you can measure, and measurement quality decides what you can promise. For solar design, the threshold sits around 15 cm per pixel. Below that, you can trace roof edges and large obstructions. Above that, you can measure vents, skylights, and parapets with confidence.
| Data Source | Typical Resolution | What You Can Measure | What You Miss |
|---|---|---|---|
| Commercial satellite | 30 cm–3 m/pixel | Roof outline, large trees, arrays | Vents, small skylights, parapets |
| Aerial (crewed aircraft) | 4.4–15 cm/pixel | Roof planes, skylights, HVAC units | Fine vents, lift heights |
| Drone photogrammetry | 1–5 cm/pixel | Everything on the roof surface, 3D heights | Interior and electrical |
| On-site tape and ladder | Millimeter | Everything including interior | Travel time and safety risk |
Aerial imagery closes much of the gap for residential work. Nearmap captures urban areas at 4.4–7 cm per pixel and refreshes coverage up to 2 times per year in major metros, per Nearmap, 2024. Where that coverage exists, a satellite-style workflow approaches drone quality for roof geometry. It still cannot deliver a 3D model of tree canopy with drone-level height accuracy.
The 3D question matters more than raw pixels. Shading loss depends on obstruction height, not just footprint. A 12 m oak tree and a 4 m hedge cast very different shadows. Satellite and aerial surveys estimate heights from stereo pairs or AI inference. Drone photogrammetry measures them. For heavily shaded sites, that difference alone can shift annual production estimates by 5–10% in industry-observed ranges.
Cost Comparison
Cost is where the two methods diverge most sharply, and where most buying decisions actually happen. Satellite surveys ride on data your design platform already licenses. Drone surveys add a real line item to every project.
Satellite Survey Costs
Most cloud design platforms bundle imagery into the subscription. The marginal cost of surveying one more address is effectively zero. Even premium aerial imagery add-ons run $0–$15 per site in industry-observed pricing. A sales team surveying 100 leads per month spends nothing extra beyond the software seat.
Drone Survey Costs
Drone costs split into outsourced and in-house models.
| Cost Item | Outsourced Drone Survey | In-House Drone Program |
|---|---|---|
| Per-site cost (residential) | $150–$500 | $30–$80 (amortized) |
| Pilot labor | Included | 2–4 hours per site |
| Hardware | None | $3,000–$15,000 (drone, sensors, spares) |
| Software | Included | $100–$400/month processing platform |
| Training and certification | None | $500–$2,000 per pilot, recurring |
| Insurance | None | $500–$1,500/year liability |
| Break-even vs outsourced | — | Roughly 15–40 surveys |
At $300 average outsourced cost, an in-house program with $10,000 in startup costs and $50 per-site marginal cost breaks even after about 40 surveys. Teams doing fewer than 5 drone surveys per month should outsource. Teams doing more than 15 should seriously consider a pilot on staff.
The Hidden Cost Comparison
The honest comparison includes the cost of being wrong. A satellite survey that misses a 3-month-old tree removal or a new chimney can produce a design that fails at install time. Redesigns, change orders, and awkward customer conversations cost $200–$1,000 per incident in industry-observed ranges. If drone verification on final designs prevents 2 such incidents per month, it pays for itself at residential volumes above roughly 10 installs.
Pro Tip
Track “design accuracy at install” as a metric. If your install crews report layout changes on more than 15% of satellite-only designs, your survey method is costing more than a drone program would.
Speed and Workflow
Speed favors satellite by an order of magnitude at the top of the funnel. A satellite survey fits inside the sales call itself. A drone survey is a scheduled event with travel, weather windows, and processing time.
The gap compounds with volume. A sales rep can qualify and quote 10–20 leads per day with a satellite workflow. The same rep supporting drone surveys manages 3–5. For utility-scale work the math flips: DroneDeploy reports, 2025, that a 30-minute drone flight captures a 25-acre site that takes a survey crew a full week to walk.
| Workflow Stage | Satellite Survey | Drone Survey |
|---|---|---|
| Lead qualification | 5 minutes | Not practical |
| Sales proposal | Same call, 15–30 minutes | 2–5 days including scheduling |
| Final engineering | Risky without verification | Same day to 2 days |
| Utility-scale mapping (25 acres) | Coarse only | 30–60 minutes flight time |
| Portfolio screening (100 sites) | 1–2 days | Weeks |
The throughput difference is why high-volume residential sales organizations default to satellite. Speed-to-quote correlates directly with close rates in competitive markets. The first professional proposal on the table wins a disproportionate share of deals.
Drone workflows compress when the pilot network is external. Drone service marketplaces dispatch a local pilot within 2–5 days in most metros. That is fast enough for post-sale engineering, but far too slow for the sales conversation itself.
Accuracy for Shading and Production Estimates
Accuracy questions split into 2 parts: geometric accuracy (are the roof dimensions right?) and shading accuracy (are the production numbers right?). Satellite surveys handle the first reasonably well. The second is where drones earn their cost.
Shade loss is the most error-prone number in a satellite-based design. Obstruction heights are estimated, imagery may be outdated, and fine features like power lines disappear at 30 cm resolution. Industry-observed error ranges for satellite-only shade estimates run 5–15% of annual production on obstructed sites, versus 1–5% with drone-measured 3D models.
A worked example shows why this matters. Take a hypothetical 8 kW residential system in a market with $0.30/kWh electricity. A 10% overestimate in shade loss means roughly 1,100 kWh per year of phantom production, or about $330 per year in savings the customer will never see. Over a 6-year review window, that is a $2,000 credibility gap and a likely bad review.
The exception is clear roofs. On an unobstructed south-facing roof, satellite estimates and drone measurements converge within 1–3%. The premium you pay for drone accuracy buys nothing on those sites. This is the nuance most “drone versus satellite” arguments miss: accuracy only matters where shading exists.
Our take: run every heavily shaded design through a physics-based shade model with measured obstruction data before you sign a contract. Our solar shadow analysis software builds the 3D scene from the best available imagery and lets you correct tree heights against drone captures when you have them. The shade report your customer reads is only as honest as the height data behind it.
Regulations, Safety, and Logistics
Regulation is the asymmetry nobody budgets for. Satellite imagery carries zero regulatory burden. Drone operations sit inside aviation law, and the rules bite commercial operators hardest.
In the United States, any drone flight for business purposes requires an FAA Part 107 Remote Pilot Certificate, drone registration, and compliance with airspace rules, according to the Federal Aviation Administration, updated 2025. Flying near airports, over people, or beyond visual line of sight requires waivers. Violations carry civil penalties that can exceed $30,000 per incident for commercial operators.
Europe follows EASA rules with similar certification tiers. The United Kingdom, Australia, and India each run their own licensing regimes. Any installer operating across regions needs a compliance process per market, not just a drone.
Safety math cuts the other way. Drones remove the leading cause of solar injuries: roof access. Every avoided ladder climb removes fall risk. Drone-based thermographic inspections also cut inspection costs by 30–40% compared with manual methods, according to AAI Drones, 2025. For operations and maintenance work on existing arrays, drones are the safer and cheaper option almost by default, as we cover in our guide to drone thermal inspection of solar farms.
Logistics add friction drones cannot escape. Rain, wind above roughly 15 m/s, and low light ground flights. Winter in northern markets can cut flyable days in half. Satellite data has no weather window at capture time because the capture already happened.
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What Most Installers Get Wrong
The most common mistake is treating this as a binary choice. Installers pick one method, apply it to every project, and pay for the mismatch on both ends. They fly drones on clear south roofs where satellite data was already sufficient, or they send satellite-only proposals on tree-covered Victorian roofs where the numbers will not survive contact with the install crew.
The second mistake is confusing imagery resolution with survey accuracy. A sharp 5 cm aerial photo is not a 3D model. Without measured obstruction heights, your shade simulation is still guessing, just at higher resolution. Teams that upgrade imagery but not 3D data see almost no improvement in production accuracy on shaded sites.
The third mistake is ignoring imagery currency. A drone flight today beats a satellite photo from 30 months ago, but a satellite photo from last month beats no survey at all. Check the capture date before you design. Most platforms display it; if yours does not, ask.
The contrarian truth: for pure residential sales, the drone-first pitch is mostly marketing. It photographs well and impresses homeowners, but the companies quoting fastest and closing most deals run satellite-first workflows and reserve capture for the sites that need it. Spend drone budget where shading and complexity justify it, not where it looks good on social media.
How to Choose: A Decision Framework
Choose your survey method by project stage and site characteristics, not by habit. The framework below reflects how we see high-performing installers structure the decision.
| Situation | Recommended Method | Why |
|---|---|---|
| Lead qualification and first quote | Satellite | Speed and zero marginal cost |
| Clear roof, low shading, standard pitch | Satellite | Accuracy gap is 1–3%, not worth $300 |
| Heavy tree shading or complex roof | Drone or verified 3D data | Shade error of 5–15% otherwise |
| Commercial rooftop (100 kW+) | Drone | 2% error exceeds survey cost many times over |
| Utility-scale site mapping | Drone | Survey-grade orthomosaic in under an hour |
| Imagery older than 12 months with visible changes | Drone | Stale data produces wrong designs |
| Final design before permit submission | Drone or on-site verification | AHJs and engineers need measured data |
| O&M inspection of existing arrays | Drone with thermal | 30–40% cheaper than manual inspection |
Practical volume rules: if you quote more than 10 residential leads per week, satellite-first is the only viable top-of-funnel workflow. If you install more than 15 projects per month and more than 20% have shading, budget for an in-house drone program or a standing contract with a pilot network. Below those numbers, outsource per site.
Whatever method you choose, standardize the output. Every survey should end as a documented 3D model with measured roof planes, obstruction heights, and a shade simulation, not a folder of photos. A solar site survey checklist keeps field teams honest about what “done” means, and the right solar shading analysis tools keep the numbers consistent from quote to permit.
Teams that want the satellite workflow without the accuracy penalty should look at platforms that model roofs in 3D from aerial imagery and let you edit obstruction heights directly. That is the workflow We reviewed documented support for into SurgePV’s design platform: satellite-speed quoting with a 3D model you can tighten against drone or field data before engineering sign-off.
Conclusion
Satellite and drone surveys are not competitors. They are different tools for different stages of the same pipeline. Satellite wins the top of the funnel: instant, free, and accurate enough for quoting clear roofs. Drones win the bottom: measured 3D data for shaded, complex, and large projects where a few percent of production error costs more than the flight.
Three actions to take this week:
- Audit your last 20 installs. Compare quoted production against design-stage assumptions and flag every project where shading estimates moved after a site visit. If more than 15% moved, your survey method needs an upgrade.
- Split your workflow by stage. Mandate satellite-first for quotes and drone or on-site verification before permit submission on shaded or complex roofs. Write it into your sales process, not just your engineering process.
- Run the drone economics. If outsourced drone surveys cost you more than $2,000 per month, price an in-house program: $10,000 in hardware and training breaks even within a season at that volume.
The installers winning on margin are not the ones with the most drones. They are the ones who know exactly which sites need one.
Frequently Asked Questions
Is a satellite survey accurate enough for solar design?
For residential proposals and shade screening, yes. Modern aerial and satellite imagery at 5–30 cm per pixel lets you measure roof planes, spot obstructions, and model shading within a few percent of field measurements. For final engineering on complex roofs or utility-scale sites, you need drone or on-site data.
How much does a drone solar site survey cost?
A residential drone survey typically costs $150–$500 per site when outsourced, including flight and processed imagery. In-house programs cut the per-site cost to roughly $30–$80 after hardware, training, and software, but require a certified pilot and $3,000–$15,000 in upfront equipment.
Do I need a license to fly a drone for solar surveys?
Yes, in most countries. In the United States, commercial drone flights require an FAA Part 107 Remote Pilot Certificate. The European Union requires registration and competency certificates under EASA rules. Penalties for unlicensed commercial flights can reach thousands of dollars per incident.
Which is faster, a satellite or drone survey?
Satellite is faster. A satellite-based survey takes 5–15 minutes inside a design platform because the imagery already exists. A drone survey needs travel, setup, flight, and processing, which typically runs 2–4 hours door to door for a single residential site.
Can drones replace physical site visits for solar?
Drones replace the roof-measurement part of a site visit, but not all of it. You still need someone to inspect the electrical panel, check structural condition, and photograph attic or interior details. Many installers pair drone capture with a short ground-level visit.
What resolution do I need for solar shade analysis?
Aim for imagery at 15 cm per pixel or sharper, plus a 3D model of obstructions. Satellite imagery at 30–50 cm per pixel works for coarse screening. Drone photogrammetry at 1–5 cm per pixel captures vent pipes, parapets, and tree canopies that drive accurate shade loss numbers.
When should I choose a drone over satellite imagery?
Choose a drone when imagery is outdated, the roof is complex, trees cause heavy shading, or the project is large enough that a 2% production error costs real money. Utility-scale sites, commercial roofs, and final permit designs almost always justify drone capture.
