The completed
package.

Q01 — Site / question

Status issued for internal review | Revision: r03b | Prepared by: Field Method (AI-assisted preparation) | Date: 2026-10-03

Decision to support

Decision D01 Before any design work advances at Old Trolley Barn Neighborhood Park, decide which existing conditions need field verification and professional review first. Early, pre-design stage.

Question Q01 Which existing conditions shape preliminary pedestrian/program consideration, and what needs verification before design advances?

Intended recipient Field Method founder, as professional reviewer, deciding whether and how to carry out field checks FV01–FV06.

Extent and applicability

Site/reference Old Trolley Barn Neighborhood Park, 1900 Adams Avenue, San Diego. City Developed Parks layer 3, OBJECTID 279 (E09).

Study extent complete E09 administrative polygon, transformed to EPSG:6340 (NAD83(2011) / UTM 11N, metres); 14,503.7 m². Context buffer 0 m. A 1 m computational collar is used only for the slope stencil. The polygon is administrative, not a surveyed legal boundary.

Included mapped terrain variation inside the polygon; documentary circulation questions; the field checks needed before a decision.

Excluded grading, drainage, hydrology, accessibility or route certification, survey, engineering, regulatory compliance, constructability, program suitability and usable acreage. The terrain data cannot resolve any of these.

Evidence and analysis

Required evidence IDs E09 (City park polygon), E10 (2024 USGS 0.5 m lidar DEM). E11 (1991 City General Development Plan) supplies historical field questions only.

Analysis A01 native-grid Horn 3 × 3 slope, percent rise/run, at selected cell centres; four descriptive communication bins. Required checks: source fitness, CRS/units, tile coverage, analytic-plane test, real-cell stencil check, NoData/edge behaviour, rerun. Accepted run r03b.

Missing inputs current circulation geometry (E07 bounding-box query returned no features; that is not evidence of absent paths); current imagery (no rights or coverage established); any survey; independent spatial alignment check.

Before the decision advances

Field checks FV01–FV06 (03-field-checks.csv). All pending.

Graphic G01 (mapped terrain evidence) and G02 (evidence → questions for verification). Internal; not included in this package.

Professional / specialist review founder review of the interpretation and its usefulness — pending. Survey, civil or accessibility specialists if a later design decision depends on grade or route.

Stop conditions stop if the source extent, units or CRS differ from this record; if FV01 shows the polygon does not match the park; or if any reader treats the slope classes as a suitability, grading or access finding.

G01 — Graphic brief

Status produced; internal review only | Revision: r03b | Related question: Q01

One finding to communicate

Mapped slope is mostly gentle, but a continuous concentration of ≥30% cells lies toward the northern and eastern parts of the polygon. That contrast is a question to verify in the field, not a design verdict.

Audience / intended decision D01 founder, deciding which field checks to make before design advances.

Evidence chain

Source IDs and dates E09 (City park polygon; feature edited 2025-08-26); E10 (USGS lidar DEM; acquired 2024-11-09 to 2024-11-21).

Analysis ID / revision A01 / r03b.

Field evidence or pending checks FV01, FV04, FV05 and FV06, all pending.

Interpretation I01 terrain contrast merits closer review; investigate the physical features that create it. Limits: outline accuracy, interpolated terrain, walls and post-2024 change are unresolved. Class membership is not a design verdict.

Composition

• Lead finding: "Trolley Barn Park · mapped terrain evidence" (G01); "Terrain evidence → questions for verification" (G02).
• Extent/reference/units: complete E09 polygon, context buffer 0 m; NAD83(2011) / UTM 11N metres; NAVD88 / Geoid18 heights in metres.
• Legend and classification: A01 derived slope, percent rise/run: 0–<5%, 5–<15%, 15–<30%, ≥30%. Descriptive communication bins only, with no access, grading or program-suitability meaning.
• Scale / north basis where meaningful: 50 m scale bar; grid north (UTM), stated as grid north.
• Distinct labels for source data, interpretation and unverified context: "Source / mapped", "Field Method analysis", "Unverified context". G02 adds "Observation", "Interpretation" and "Unverified".
• Caption: "Communication classes describe terrain variation; they are not access, grading or program suitability standards." Plus extent, references, FV01–FV06 pending and source/record locators.
• Accessible text equivalent: "Four mapped slope classes within the administrative park polygon. Most of the park is under 15%; cells of 30% or more concentrate along the northern and eastern edges. Current entries and paths are not mapped."

QA before use

Values checked against A01 median 5.4%, 95th percentile 53.5%, class shares 45.51 / 36.68 / 4.97 / 12.85% of 57,999 cells. An initial layout overlap failure was found and repaired before acceptance. r03a figures are superseded. Not tested: independent reader comprehension.

Source reuse E10 is public domain. City redistribution terms for the E09 outline are unresolved, so G01/G02 stay internal and are not part of this package.

Output filename / format / revision figures/r03b/graphic-01 and graphic-02 (SVG editable source; PNG checked viewing export).

Reviewer / review date / corrections Field Method layout QA, 2026-10-03. Founder professional review pending.

QA01 — Review before handoff

Reviewer Field Method (AI-assisted computational, document and graphic checks) | Date: 2026-10-03 | Package revision: r03b

Status partial. Computational and document checks done; field, professional and recipient review not done.

• ✓Checked: Q01 names a bounded decision and its exclusions. (01-scope.md)
• ✓Checked: Every evidence/graphic/interpretation ID resolves to a record or artifact. (E07, E09–E11 → A01 → I01–I03 → G01/G02 → FV01–FV06)
• ✓Checked: Source locator, acquisition date, access date and revision are distinguished. (E10 acquisition 2024 vs catalog publication 2026; E09 edit timestamp is not a survey date)
• ✓Checked: Units, coordinate/vertical references, extent and coverage are explicit where relevant. (EPSG:6340 m; NAVD88/Geoid18 m; tile intersections sum to the full polygon; no NoData at selected cells)
• ✓Checked: Source quality and analysis checks support this limited use; resolution is not asserted as accuracy. (analytic plane max error 0.000011 percentage points; 8 real-cell checks max 0.00097 percentage points; tolerance 0.001; two runs identical)
• ✓Checked: Observations, interpretation and decisions are visibly separate.
• ○Not checked: Actual field checks include observer/date/location; incomplete checks remain pending. (Cannot be checked yet: no field check has been performed. FV01–FV06 remain pending.)
• ✓Checked: Graphic values, legends, captions and text equivalents agree with the evidence. (checked locally against A01)
• ✓Checked: Permissions/attribution match the intended recipient and use. (Yes for the internal recipient. City redistribution terms are unresolved, so E09 geometry and the figures are withheld from any external release.)
• ✓Checked: Current filenames/revisions and recipient instructions agree; superseded work is identifiable. (r03b accepted; r03a superseded and preserved)
• ✓Checked: Professional/specialist review scope and remaining actions are recorded. (Recorded in 01-scope.md and 06-handoff.md. The founder review itself has not been performed.)
• ✓Checked: Recipient comprehension was tested, or is explicitly untested. (Explicitly untested: no independent recipient has received the package.)

Unresolved items and effect on use no field observations; no independent spatial alignment against imagery or survey; no independent rerun; City redistribution terms unresolved. Effect: the package can direct field checks. It cannot support placing a zone, choosing a route or any design conclusion.

Corrections / responsible person / next action founder completes FV01–FV06 and reviews I01–I03; a separate recipient tests the handoff without coaching.

Decision D01 may advance? Hold. Only the field checks may proceed. Authority: founder.

Checking boxes records review activity. It does not establish engineering, regulatory or professional approval.

H01 — Coordinated handoff

Package title / ID Trolley Barn Park preliminary terrain review / TROLLEY-BARN

Revision / date r03b, 2026-10-03

Prepared by / reviewed by / recipient Field Method (AI-assisted preparation) / computational and document QA only (QA01) / Field Method founder, professional reviewer

Status issued for internal review. Founder review pending.

Question and current decision state

Q01 Which existing conditions shape preliminary pedestrian/program consideration, and what needs verification before design advances?

D01 Hold. Proceed only with field checks FV01–FV06. No zone, route or design recommendation is made. Authority: founder.

What the package supports

Use it to direct field verification inside the E09 polygon. 82.19% of selected cells are below 15% mapped slope (median 5.4%), and the ≥30% class (12.85%) is concentrated toward the north and east (I01, I02). The whole-site median hides that concentration.

What it does not establish grading, drainage, hydrology, survey, accessibility or route certification, regulatory compliance, constructability, program suitability or usable acreage. Surveyor, civil and accessibility specialists are needed if a later decision depends on grade or route.

Files and links

Open actions

FV01 → E09 extent → founder → dated observation at the Adams Avenue approach → pending

FV02–FV03 → I02/I03, E07, E11 → founder → entries, continuity, activity and conflicts → pending

FV04–FV05 → I01, E10 → founder → visible grade breaks, steps, walls and concealed edges → pending

FV06 → G01/G02 → founder → confirms / challenges / unresolved, with rationale → pending

R01 → whole package → independent recipient → rerun A01 and read the package without coaching → not started

Do not close a pending action without its supporting record.

Recipient instructions

Read 01-scope.md, then 02-evidence.csv, 04-graphic-brief.md, 03-field-checks.csv and 05-qa.md. CSV opens in any spreadsheet; no GIS software is needed to read the package.

To reproduce A01, recover E09 from the City API (OBJECTID 279) and E10 from the two USGS tile URLs, match the SHA256 values in 02-evidence.csv, and recompute A01 as specified in 01-scope.md with a new run ID (the exact command is in the internal validation record, which is not included). If a source has changed and no longer matches, record a new source revision. Do not treat it as the same run.

Recipient check

Can the recipient find the evidence, understand the uncertainty and identify the next action without coaching?

Actual recipient / date / feedback not tested.

Corrections / superseded revision r03a superseded by r03b; DEM, slope and class arrays identical between the two runs.