Los Angeles (demonstration)

The slab that is too hot in July and too slow to dry in November

DemonstrationEdit the plan

When barefoot crossing is open for crossing barefoot

Each month read on its 15th · 2026
Crossing it barefoot, through the year. Barefoot crossing is open for crossing barefoot 11:00 AM to 6:00 PM, every month of the year. 12 months open, 0 shut, 0 unanswered.JanFebMarAprMayJunJulAugSepOctNovDec12months open
  • Works
  • Tight
  • No
  • Unanswered

Rings run from 9 am at the centre to 8 pm at the edge.

Barefoot crossing is open for crossing barefoot 11:00 AM to 6:00 PM, every month of the year.

  • All year: open 11:00 AM to 6:00 PM. It carries on past 6:00 PM, which is later than most people do this.
The same year as a table
MonthOpenUsable hoursWhat decides it
January11:00 AM–6:00 PM7 hStill usable afterwards
February11:00 AM–6:00 PM7 hStill usable afterwards
March11:00 AM–6:00 PM7 hStill usable afterwards
April11:00 AM–6:00 PM7 hStill usable afterwards
May11:00 AM–6:00 PM7 hStill usable afterwards
June11:00 AM–6:00 PM7 hStill usable afterwards
July11:00 AM–6:00 PM7 hStill usable afterwards
August11:00 AM–6:00 PM7 hStill usable afterwards
September11:00 AM–6:00 PM7 hStill usable afterwards
October11:00 AM–6:00 PM7 hStill usable afterwards
November11:00 AM–6:00 PM7 hStill usable afterwards
December11:00 AM–6:00 PM7 hStill usable afterwards
House18 ftDense deciduous tree29.5 ftBarefoot crossing8° upN16 ft
BuildingNot yoursCanopyShadow nowCan see inProposed

Reading at

6:34 PM·September
September 14 · Barefoot crossing

The evidence behind this whole day is thin, so nothing on the strip is marked out as worse than the rest. The shape of the day is still the model’s best reading; the confidence in it is low, and it stays low until something it needs is measured.

Barefoot crossing is open for crossing barefoot 12:00 AM to 11:30 PM.

About 23.5 hours in September.

The same day as a table
The same day hour by hour, in text.
HourSunVerdictConfidenceSun position
12:00 AMdarkWorksa starting hypothesis
3:00 AMdarkWorksa starting hypothesis
6:00 AMdarkWorksa starting hypothesis
7:00 AMin sunWorksa starting hypothesis2° up, bearing 87°
8:00 AMin sunWorksa starting hypothesis12° up, bearing 98°
9:00 AMin sunWorksa starting hypothesis21° up, bearing 110°
10:00 AMin sunWorksa starting hypothesis31° up, bearing 123°
11:00 AMin sunWorksa starting hypothesis38° up, bearing 139°
12:00 PMin sunWorksa starting hypothesis43° up, bearing 157°
1:00 PMin sunWorksa starting hypothesis46° up, bearing 178°
2:00 PMin sunWorksa starting hypothesis44° up, bearing 199°
3:00 PMin sunWorksa starting hypothesis39° up, bearing 218°
4:00 PMin sunWorksa starting hypothesis32° up, bearing 234°
5:00 PMin sunWorksa starting hypothesis23° up, bearing 248°
6:00 PMin sunWorksa starting hypothesis13° up, bearing 260°
7:00 PMin sunWorksa starting hypothesis3° up, bearing 271°
9:00 PMdarkWorksa starting hypothesis

Ten seconds, no shoes, between the door and the water.

Crossing it barefoot

Barefoot crossing works for crossing barefoot at this hour.

  • Direct sun is15 over100 / 100 against at most 85

    Sun on the crossing is only a problem because of what it has done to the slab for the last four hours.

Confidence low (37%). Treat this as a starting hypothesis, not an answer.

What this answer was built from
  • Use
    Crossing it barefoot
  • Place
    Barefoot crossing
  • Weather
    Temperate maritime, mild, grey, damp (scenario shape), scenario (from a published source)
  • Method
    Traced geometry and radiation at this hour, measured against what this use needs
  • How well this place is described

    Mapped
    1. Quick
    2. Mapped
    3. Annotated
    4. Measured

    Shade, sky view and daily light are computed from real geometry rather than assumed. This is the rung at which the product starts telling you things you did not already know.

    It cannot answer who can see in, and it cannot tell you whether the heights it is using are the real ones.

    To reach Annotated

    • Photographs of the actual place: None annotated. A photograph is how a drawn height gets checked against a real one.
    • Photographs that know where they were taken from: No photograph has a position and a bearing, so what is marked on them cannot become a measurement.
    • Who can see in: Nobody marked. Privacy is a question about who sees in from where, and the product will not invent one.

    What that buys: The privacy question, and a check on the geometry. Most inferred heights are wrong by enough to matter, and a photograph settles it in a minute.

    Everything that was checked
    • Quick A place on the earth: Los Angeles (demonstration), with a time zone, which is what makes an hour an hour.
    • Quick Somewhere to read: 1 spot marked. A reading is a height at a place, and moving it moves the answer.
    • Mapped The things in the way: 2 objects drawn. The house counts, and so does the neighbour's.
    • Mapped What is underfoot: 1 of 1 readings sit on a mapped surface.
    • Mapped Where the property ends: Drawn, so the product can tell you when the cheapest fix stands on someone else's land.
    • Annotated Photographs of the actual place: None annotated. A photograph is how a drawn height gets checked against a real one.
    • Annotated Photographs that know where they were taken from: No photograph has a position and a bearing, so what is marked on them cannot become a measurement.
    • Annotated Who can see in: Nobody marked. Privacy is a question about who sees in from where, and the product will not invent one.
    • Measured Heights off a tape: All 2 objects are marked as measured.
    • Measured Something checked against the day: Nothing has been checked against a real afternoon. The model is unopposed, which is not the same as being right.

    What to measure next

    Ranked by how far the answer moves, not by a checklist
    1. 1Who can actually see inSit in the chair

      Sit where you actually sit and look around. Mark the one window or path you can see a person from. Until one exists, privacy is a question we are not answering rather than one that is fine.

      This is not a refinement. Nothing can answer this question until somebody marks it.

      Currently assuming: nobody is overlooking this. Tested across one confirmed observer changes the whole privacy answer.

    2. 2What you are looking atSit in the chair

      Mark the direction of the view worth keeping. Without it, every screening recommendation is optimising against nothing.

      This is not a refinement. Nothing can answer this question until somebody marks it.

      Currently assuming: no view is being protected. Tested across one corridor changes what screening is worth doing.

    What the place is doing at 6:34pm in September

    Temperate maritime, mild, grey, damp (scenario shape).

    What it feels like

    comfortable

    63.3°F

    Felt temperature · 34 on the reporting scale

    It feels about what the thermometer says, roughly 63°F.

    What is doing it

    • How much sky is overhead

      2.5°
    • Direct sun on the seat

      +2.2°
    How this was worked out
  • Air
    63.6°F from Temperate maritime, mild, grey, damp (scenario shape), scenario (from a published source)
  • Radiant
    63.0°F mean radiant temperature
  • Method
    Six-directional radiation integration, then ASHRAE operative temperature (from a published source)
  • Direct sun

    in sun

    9 W/m²

    Beam reaching this point · 100 on the reporting scale

    Direct sun is on this spot right now.

    How this was worked out
  • Sun
    8deg up, bearing 266deg
  • Traced
    100% of the beam reaches this point
  • Glare

    none

    0

    out of 100

    Nothing bright is in the line of sight at this hour.

    How this was worked out
  • Facing
    120deg (assumed, not measured)
  • Assumed
    Which way the seat faces has not been set, so glare is estimated from the open direction. (assumed, not measured)
  • Privacy exposure

    Unanswered

    No observer has been placed yet. Privacy is a question about who can see in from where, and until one is marked there is nothing to answer.

    Wind

    still

    0.7 mph

    Wind at the seat · 3 on the reporting scale

    Dense deciduous tree is taking about 40% of the wind off this spot.

    What is doing it

    • Dense deciduous tree

      0.5 mph
    How this was worked out
  • Reference
    9.2 mph at 10 m from Temperate maritime, mild, grey, damp (scenario shape), scenario (from a published source)
  • At seat height
    1.2 mph before shelter
  • Shelter
    40% removed by what stands upwind
  • View

    Unanswered

    No view worth keeping has been marked, so there is nothing to weigh a screen against yet.

    Surface heat

    comfortable

    66.4°F

    Surface temperature · 8 on the reporting scale

    The surface is running about 66°F.

    How this was worked out
  • Surface
    Mixed-exposure concrete slab
  • Method
    Absorbed shortwave against air temperature, flattened by air movement (from a published source)
  • Wetness

    dries-fast

    1.1 x

    Drying time against the open · 22 on the reporting scale

    Still air here; moving air does a surprising amount of the drying.

    How this was worked out
  • Drying rate
    0.000 in/hour here
  • Method
    Penman combination equation on the radiation and air actually reaching this spot (from a published source)
  • Light after dark

    daylight

    0

    out of 100

    Artificial light is not doing anything at this hour.

    How this was worked out
  • Sun
    still up
  • Ask something else about this place

    Everything on the plan, in text
    ThingReadingNote
    House18 ft100 per cent solid.
    Dense deciduous tree29.5 ft75 per cent solid, and seasonal.