How do I plan a drone flight that holds up as a record?

Authority

14 CFR Part 107, Subpart B, operating rules: 107.31 visual line of sight, 107.41 operation in certain airspace, 107.49 preflight familiarization and inspection, 107.51 operating limitations · 14 CFR 107.205, the list of sections a certificate of waiver can reach · FAA Order JO 7400.11M, Airspace Designations and Reporting Points, issued 30 July 2026, effective 15 September 2026, Appendices C, D and E · EPA 2022 Construction General Permit as modified 8 April 2025, Parts 7.2.4 and 7.4.1. Puerto Rico is covered under permit PRR100000, administered directly by EPA Region 2 · Verification date for every quotation on this page: 6 September 2026

Sources

8 sources

14 CFR 107.31, Visual line of sight aircraft operation (eCFR) · 14 CFR 107.41, Operation in certain airspace (eCFR) · 14 CFR 107.49, Preflight familiarization, inspection, and actions for aircraft operation (eCFR) · 14 CFR 107.51, Operating limitations for small unmanned aircraft (eCFR) · 14 CFR 107.205, List of regulations subject to waiver (eCFR) · FAA Order JO 7400.11M, Airspace Designations and Reporting Points, issued 30 July 2026 (PDF) · Establishment of Class D and Class E Airspace; Ceiba, PR, 91 FR 23903, 4 May 2026, effective 9 July 2026 (Federal Register) · EPA 2022 Construction General Permit, as modified (PDF)

Verified

6 September 2026

Status

Current

What makes a documentation flight different from any other drone flight?

A documentation flight is planned so a second flight, months later, can repeat it exactly, because the product is the comparison between two dates rather than any single image.Our reading¶

Everything in the plan exists to hold one variable steady: the site itself. Altitude, line spacing, overlap, camera angle, ground speed, the targets on the ground, the hour of the day. Change any of them between flights and the change appears in the imagery as though the ground had moved.Our reading¶

The operating rules set some of these numbers and leave the rest to the pilot. 107.51 sets the ceiling, the speed limit and the weather gates. 107.31 sets how far the plan can reach from where you stand. 107.49 sets what must be checked before every takeoff, and it is the one that asks for a discrete act before the aircraft moves rather than a limit observed while it flies, which is what makes it the natural place to generate a record. The numbers the rules leave open are the ones that decide whether the record is usable, and this page marks which is which.Our reading¶

How high do I fly, and how far can the plan reach?

The ceiling is 400 feet above the ground beneath the aircraft, and it moves with the terrain, so a ridge in the middle of a site raises the ground and lowers your headroom over that ridge. The reach of the plan is set by how far the aircraft stays visible to the naked eye from where you stand, not by how long the battery lasts.Our reading¶

The exception in paragraph (b) is the one that matters on a site with a tall structure. Inside a 400-foot radius of a structure, the aircraft may climb to 400 feet above that structure's immediate uppermost limit. A 120-foot crane therefore puts 520 feet above ground within reach while the aircraft stays inside the radius, and documenting the top of a tall structure stays inside the rule.Our reading¶

Height buys coverage and costs detail. As field practice, not as any rule: 250 to 350 feet above ground level for whole-site progress documentation, 150 to 200 feet for a single work area, 100 to 120 feet when small objects have to stay legible. No section of Part 107 sets a working height. Halving the height quadruples the number of images needed to cover the same ground at the same overlap and doubles the distance flown, and the flight time doubles again where the capture interval forces a slower line, so the height is a budget decision as much as a quality one.Unverified¶

On sloped ground a plan flown at a constant height above the launch pad drifts closer to the ground on the high side and further on the low side, which changes both the detail and the real overlap across the same block. Plan with terrain following where the aircraft supports it, or split the area into blocks at different heights and keep that block layout identical from flight to flight. This is field practice; the rule only fixes the ceiling.Unverified¶

Reach is set by 107.31, not by the battery. The rule counts one aid, corrective lenses. The camera feed, a zoom, goggles and binoculars all fall outside it. On terrain with relief or a high tree line, that is what caps the distance a single block can cover, and the answer is a different launch point, more blocks, or a visual observer.Our reading¶

A remote pilot in command and the person manipulating the flight controls of the small unmanned aircraft system must comply with all of the following operating limitations when operating a small unmanned aircraft system: (a) The groundspeed of the small unmanned aircraft may not exceed 87 knots (100 miles per hour). (b) The altitude of the small unmanned aircraft cannot be higher than 400 feet above ground level, unless the small unmanned aircraft: (1) Is flown within a 400-foot radius of a structure; and (2) Does not fly higher than 400 feet above the structure's immediate uppermost limit.

With vision that is unaided by any device other than corrective lenses, the remote pilot in command, the visual observer (if one is used), and the person manipulating the flight control of the small unmanned aircraft system must be able to see the unmanned aircraft throughout the entire flight in order to:

How much front and side overlap does a documentation flight need?

Plan 75 to 80 percent front overlap and 65 to 70 percent side overlap for a documentation flight, and treat both as field practice, because no section of Part 107 sets an overlap number.Unverified¶

Front overlap is how much each image shares with the one taken just before it along the same line. Side overlap is how much each line shares with the line beside it. Both exist for the same reason: every point on the ground has to appear in several images taken from several positions, or that point has nothing to be built from.Unverified¶

Raise both numbers over anything uniform or moving. Vegetation, water, fresh concrete, gravel, bare graded fill and repetitive facade all look the same from image to image, and a thin plan over that ground produces holes in the middle of a mosaic and edges that bend. Wind eats side overlap quietly: an aircraft pushed off its line flies a track narrower or wider than the plan assumed, and the loss shows up on one flank of the block only.Unverified¶

Plan the overlap against the highest ground in the block. Ground closer to the camera produces a smaller footprint per image, so the real overlap over a rise is always lower than the number typed into the plan, and the rise is usually where the interesting work is.Unverified¶

Overlap is the one decision on this page that cannot be repaired afterwards. An area photographed twice stays photographed twice, whatever is done with the images later, and the thin spot surfaces at the exact corner someone asks about a year on.Unverified¶

Single grid or double grid, and when is the second pass worth it?

Fly a single grid with the camera pointed straight down over open ground, and a double grid, two sets of parallel lines crossed at ninety degrees with the camera tilted back about twenty degrees, as soon as anything vertical carries information.Unverified¶

Vertical means walls, formwork, retaining structures, cut and fill slopes, trench faces, stockpile flanks and any building past foundation stage. A straight-down single grid records the top of a wall and the ground beside it and very little of the wall itself, which is a problem that only becomes visible when someone asks how far the wall got that month.Unverified¶

The cost is predictable: a double grid roughly doubles flight time, battery count and image count over the same ground. Decide it at plan time and carry it in the plan, because discovering it in the field turns one flight into two.Unverified¶

For a single tall object, an orbit at two or three heights with the camera tilted at the object adds the faces a grid cannot reach. An orbit is a supplement to the grid, not a replacement, and it repeats only if the radius, the heights and the number of stops are written down.Unverified¶

The camera angle belongs to the repeatable plan. A series flown straight down one month and at twenty degrees the next produces two records that disagree about the same wall, and the disagreement is in the plan, not in the site.Unverified¶

When do I need ground control targets, and where do they go?

Put ground control targets out whenever the imagery has to line up with a previous flight or with the project's existing drawings, which on a documentation series means every flight of that series, and set them where the work will not reach, spread wide across the high and the low ground and never all in a line.Unverified¶

Five is the working minimum: four spread near the corners of the area and one near the middle. Add more as the area grows, and add more where the ground rises and falls, because targets clustered on the flat part leave the model unconstrained exactly where the terrain does the most work. Plan a few beyond the minimum so some can be held back and used only to check the result.Unverified¶

Placement rules that matter more than the count: never all in a straight line, open sky above each one so it lands in many images, clear of anything that will be excavated, stockpiled or driven over, and large enough with hard edges to be unmistakable at the planned height.Unverified¶

The value of a target is that it is the same target next month, so set it where the work will not reach: rock, an existing pad, ground outside the active area, a permanent structure. Photograph each one from directly above and from eye level on the day it goes in, give it an ID that never changes, and reuse that ID for the life of the series.Unverified¶

The values written against those targets come from the project's licensed professional of record, or from drawings that professional already produced. The flight consumes those values. Confirm before the first flight which coordinate system the project's other drawings already use; in Puerto Rico that is commonly NAD83 Puerto Rico and Virgin Islands, EPSG 32161, and it is worth asking rather than assuming.Unverified¶

1. Walk the area before the first flight and mark target positions on a printed plan.
2. Set the targets where the work will not reach, spread wide, spread across the high and low ground, and never in a line.
3. Photograph each target from above and from eye level, with its ID visible.
4. Get the values for each target from the project's licensed professional of record.
5. Leave the targets in place, and check their condition at the start of every later flight.
6. Log which targets were present and usable on each flight.

What changes when the camera has an electronic shutter instead of a mechanical one?

An electronic shutter reads the sensor line by line while the aircraft is still moving, so every frame carries a small skew, and the correction for it lives in the flight plan rather than in the equipment list.Unverified¶

A mechanical shutter opens and closes over the whole frame at once, which freezes the aircraft's motion. Reading line by line does not: the top of the frame and the bottom of the frame are captured at slightly different moments and therefore from slightly different positions. At a walking pace the effect is invisible in any one image.Unverified¶

It stops being invisible when several hundred images are combined. The skew points the same way on every frame flown in the same direction, so it accumulates rather than averaging out, and it shows up as a gentle bow across a long thin block. The failure hides best in the middle of a large flat area, which is the part nobody inspects, and it surfaces as a height difference between two flights that both looked fine on their own.Unverified¶

Four planning moves address it: fly the line slower, use a stop-and-capture mission mode where the aircraft supports one even though it costs flight time, raise the overlap, and put more targets on the ground. Positioning hardware improves the record of where each image was taken; targets and a slower line address how each image was made. They are different problems, and each one has its own answer.Unverified¶

How do I fly the same mission month after month?

Fly it from a saved file rather than from memory: altitude, line spacing, heading, overlap, camera angle and speed are stored once and reflown, and everything that cannot be stored in the file gets written on a one-page mission sheet that travels with it.Unverified¶

The items that live on the sheet rather than in the file are the ones people forget: the launch point, marked on the ground and photographed; the direction the first line runs; which blocks were flown and in what order; which targets were in place; and the time window. A second person should be able to take the file and the sheet and produce an image that lines up with the last one.Unverified¶

Light is geometry in an image. A site photographed at nine in the morning in January and at four in the afternoon in June reads as two different sites, because the shadows carry apparent shape. Pick a window and hold it: mid-morning to early afternoon keeps shadows short and even, and bright overcast flattens hard shadow across the whole site at once, which is what a progress comparison needs. Low sun exaggerates relief, which is useful for a drainage question and misleading for a progress comparison.Unverified¶

In Puerto Rico, wind is worth checking as closely as rain. The trade wind usually builds through the morning and peaks in the afternoon, and inland convection builds after noon, which is the practical argument for early flights beyond the light. Gusts matter more than the average: an aircraft correcting for a gust rolls to hold position, and a rolled aircraft photographs a different footprint than the plan assumed. Set a personal cutoff below the manufacturer's stated limit and write it on the mission sheet, so the decision is made on the ground the day before rather than in the field with a crew waiting.Unverified¶

The rule sets the outer gate around all of that: 107.51(c) requires at least 3 statute miles of flight visibility as observed from the location of the control station, and 107.51(d) requires the aircraft to stay 500 feet below cloud and 2,000 feet horizontally from cloud. Those are limits, not targets. The window that produces a comparable record is much narrower, and it is yours to define.Our reading¶

(c) The minimum flight visibility, as observed from the location of the control station must be no less than 3 statute miles. For purposes of this section, flight visibility means the average slant distance from the control station at which prominent unlighted objects may be seen and identified by day and prominent lighted objects may be seen and identified by night. (d) The minimum distance of the small unmanned aircraft from clouds must be no less than: (1) 500 feet below the cloud; and (2) 2,000 feet horizontally from the cloud.

1. Save the mission file after the first successful flight of the series and name it for the site and block.
2. Write the one-page mission sheet: launch point, block order, first-line heading, camera angle, target IDs, time window, wind cutoff.
3. Photograph the launch point with something permanent in frame.
4. On each later flight, refly the saved file and record every deviation and its reason.
5. File the mission sheet, the deviation notes and the preflight assessment together with that flight's images.

What does the rule require in the minutes before takeoff?

107.49 requires the remote pilot in command, prior to flight, to assess the operating environment, considering risks to persons and property in the immediate vicinity both on the surface and in the air. That assessment must include local weather conditions, local airspace and any flight restrictions, the location of persons and property on the surface, and other ground hazards.Our reading¶

The section continues past the assessment: everyone directly participating in the operation is informed about the operating conditions, emergency procedures, contingency procedures, roles and responsibilities and potential hazards; all control links between the ground control station and the aircraft are working properly; there is enough available power to operate for the intended operational time; anything attached to or carried by the aircraft is secure and does not adversely affect the flight characteristics or controllability of the aircraft; and, if the operation will be conducted over human beings under subpart D, the aircraft meets the category requirement that applies.Our reading¶

There is no waiver for it. 107.205 lists the sections a certificate of waiver can reach, and 107.49 is absent from that list, alongside the sections on hazardous material, operating in the vicinity of airports and operating in prohibited or restricted areas. This one is done on the twentieth flight of a familiar site exactly as on the first.Our reading¶

The launch point sits inside the assessment 107.49 already requires. The location of persons and property on the surface, and the other ground hazards, are read at the place where the aircraft takes off and lands as closely as along the route it will fly.Our reading¶

Standing somewhere is a separate permission from flying over it, and Part 107 does not reach it. A route planned carefully around a sensitive area still begins and ends somewhere, and that somewhere needs its own answer, settled at plan time rather than on the morning of the flight.Unverified¶

Make it a document. 107.49 requires the assessment on every flight; turning that assessment into a dated page is ours to do, not the rule's, and it is the cheapest record in the operation. Fill it in on paper or on a form, photograph it with the date and the site visible, and file it with that flight's images. When someone asks a year later who decided what to photograph and when, that page is the answer, and a page that exists for every flight in the series is worth more than any single one of them.Our reading¶

Prior to flight, the remote pilot in command must: (a) Assess the operating environment, considering risks to persons and property in the immediate vicinity both on the surface and in the air. This assessment must include: (1) Local weather conditions; (2) Local airspace and any flight restrictions; (3) The location of persons and property on the surface; and (4) Other ground hazards.

1. Check local weather against your own window and your own wind cutoff, not only against the legal minimum.
2. Check local airspace and any flight restrictions for every part of the area to be flown, not only for the launch point.
3. Walk the ground and note where people and property will be during the flight window.
4. Note the other ground hazards: wires, antennas, moving equipment, open excavation, loose material near the launch point.
5. Brief everyone directly participating on conditions, emergencies, contingencies, roles and hazards.
6. Verify that all control links are working properly, confirm enough available power for the intended operational time, and secure anything attached so it does not affect flight characteristics or controllability.
7. If the flight will be over people, confirm the aircraft meets the subpart D category that applies.
8. Photograph the completed assessment and file it with the flight.

What part of this is drawn at a desk?

On a site covered by the construction stormwater permit, the site map is a drafting job: the permit names the features the map has to show, and the sources for most of them are documents the project already holds.Our reading¶

The list that follows the sentence quoted below is a drawing scope. Among the features the permit names: the locations where earth-disturbing activities will occur, with any phasing noted and demolition included; approximate slopes before and after major grading activities, with steep slopes noted; where sediment, soil and other materials will be stockpiled; any receiving water crossings; the designated points where vehicles exit onto paved roads; structures and other impervious surfaces upon completion; on-site and off-site construction support activity areas; any areas of Federally listed critical habitat within the action area of the site; the type and extent of pre-construction cover; drainage patterns of stormwater and authorized non-stormwater before and after major grading activities; discharge locations; the activities that generate pollutants; and the stormwater controls in use, shared controls included. That list runs to eleven headings, several with further items under them, and reading it as a list of layers rather than as permit prose is what turns it into work that can be scheduled and priced.Our reading¶

Then Part 7.4.1 puts a clock on it. The SWPPP, the site map included, must be modified within seven days once a change on the site is no longer accurately reflected in it. Seven days is short on an active site, where a phase opens, a stockpile moves or an exit relocates most weeks, and it means the map is a live sheet on a working file rather than a one-time deliverable. Whoever already has that file open, layered and georeferenced is the one who can meet that clock.Our reading¶

The two halves feed each other. A dated flight establishes when the ground changed and what it looked like; the sheet records the change inside the seven days. Anything that goes to an agency goes across the desk of the project's licensed professional of record first, and the sheet is prepared so that review is a signature rather than a redraw.Our reading¶

The output is a sheet on a working file: layered, drawn to scale, and updated in place as the ground changes. It is scheduled and priced the way drafting work is scheduled and priced.Our reading¶

Site Map. Include a legible map, or series of maps, showing the following features of the site:

You must modify your SWPPP, including the site map(s), within seven (7) days of any of the following conditions:

What most people have wrong

Each of these is a thing said confidently in public that the rule does not support. The section number settles it.

1. 400 feet is a hard ceiling everywhere on the site.Paragraph (b) carries an exception: inside a 400-foot radius of a structure, the aircraft may climb to 400 feet above that structure's immediate uppermost limit. A 120-foot crane makes 520 feet above ground legal while the aircraft stays inside the radius.14 CFR 107.51(b)
2. The 400 feet is measured from where I took off.It is measured above ground level, and the ground is whatever lies beneath the aircraft at that moment. Fly a constant height away from the launch pad and across a rise, and the aircraft crosses the ceiling over the rise while the controller still reads a legal number.14 CFR 107.51(b)
3. Watching the aircraft on the controller screen counts as keeping it in sight.The rule counts one aid and one only: corrective lenses. The camera feed, a zoom, goggles and binoculars all fall outside it. On terrain with relief or a high tree line, this is what limits how far a block can reach, and it limits it well before the battery does.14 CFR 107.31
4. Nearly everything in Part 107 is waivable, so the preflight is a formality that experienced pilots skip.The waiver list omits 107.49 entirely, along with the sections on hazardous material, operating near airports, and prohibited or restricted areas. The preflight assessment is required on every flight with no path around it, which is why it is the one step of the operation that comes back every single time.14 CFR 107.205
5. Overlap is a processing preference that can be sorted out later.Overlap is a flight-plan decision with no repair path: ground photographed twice stays photographed twice. Thin overlap surfaces as a hole in the middle of a mosaic or a bent edge, and it surfaces at the corner someone asks about a year later.Field practice: Part 107 sets no overlap number
6. A positioning upgrade fixes accuracy problems.Positioning hardware improves the record of where each image was taken. An electronic shutter distorts how each image was made, by reading the sensor line by line while the aircraft moves. Those are different failures, and the second one is answered with targets on the ground, a slower line and more overlap.Field practice: no rule governs equipment choice
7. The chart shows controlled airspace over the site, so authorization is required.107.41 names four things: Class B, Class C, Class D, and the surface area of Class E airspace designated for an airport, which it reaches across that surface area's whole horizontal footprint. Class E that begins above the ground is not on that list at any altitude. So the question at a given coordinate is which of those four reaches the ground there, and during which hours. The trap runs both directions: pilots request authorization where none of the four applies, and pilots miss a part-time surface area that happened to be inactive the day they last checked.14 CFR 107.41
8. The big airport on the island is Class B, like every other big airport.There is no Class B airspace anywhere in Puerto Rico. San Juan is Class C. Ponce and Mayaguez have Class E surface areas that are effective only during dates and times established in advance, so the same point can require authorization at one hour of the day and none at another. Ceiba gained a Class D surface area effective 9 July 2026, so any flight material written before that date is out of date for that area. Confirm the designation against the edition of the Order in force on the day of the flight; the edition cited here takes effect 15 September 2026.FAA Order JO 7400.11M, issued 30 July 2026, Appendices C, D and E. Ceiba: 91 FR 23903, 4 May 2026, effective 9 July 2026
9. The preflight airspace check is done once for the site and reused.107.49(a)(2) puts local airspace and any flight restrictions inside the assessment that must be made prior to flight, on every flight. Temporary restrictions appear and expire, and designations change. The check is made for every part of the area to be flown, on the day it is flown.14 CFR 107.49(a)(2)
10. The site map is drawn once and filed.Part 7.4.1 requires the SWPPP, site map included, to be modified within seven days once a change on the site is no longer accurately reflected in it. Six conditions trigger that clock, and the everyday one is exactly this mismatch between the sheet and the ground. On an active site that makes the map recurring drafting work on a short clock, not a one-time deliverable.EPA 2022 CGP Part 7.4.1

Where this goes next

• Do I need FAA permission to fly over my Puerto Rico job site?The airspace half of the plan: Class C at San Juan, part-time surface areas at Ponce and Mayaguez, grid values, and the two very different clocks for getting an authorization.
• Can I legally fly a drone over my job site in Puerto Rico?Written permission before the aircraft leaves the case. Puerto Rico law reaches the recording itself, separately from anything in Part 107.
• Can I fly a drone over protected land in Puerto Rico?Where the plan gets routed around rather than climbed over, and why the launch point matters as much as the flight path.
• What does the EPA construction permit require me to photograph?The cadence that decides how many of these flights a site needs in a year, and the record each one has to produce.

Written by a FAA Part 107 Certified Remote Pilot in western Puerto Rico, and verified on 6 September 2026. Something out of date or wrong on this page? Write and say so — corrections are read and dated.