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sitedia

Site Analysis Diagram Generator

One address — 24diagrams at once.

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Full set: 14,390,000bldgs
Coverage: Central London

Myeong-dong, Seoul
37.5636 N · 126.9850 E · r 500 m

Site ↓

About building data The buildings in the diagrams (outline, height, use and year built) come from Overture Maps (OpenStreetMap), Environment Agency LiDAR and EPC records. So It may differ from the actual site — recently built buildings may be missing, demolished buildings may still appear, or the number of storeys or use may be blank. Changes reach sitedia only after the original source is updated (the source updates first, then the data is re-collected, so there is a delay). More about data sources

Site

Search an address or click the map. Parcels and boundaries work too.

Site

Point Parcel Boundary

Click the map, or drag the red dot to move the site.

Show parcel lines in radius Show centre site marker Show site marker

▼ Triangle ● Dot ＋ Cross

Marker size 100%

Clear buildings inside the site Merge parcels Site display

Filled Outline

Solid Dotted Dashed

Marker colour

Shape

Circle Square Rectangle

Size 1.6km × 1.6km

Widthm Heightm

Each side 200–3,000 m.

Radius 800m

200m850m1.5km

PNG resolution 2000px PNG export size only — SVG is vector.

Download

Site overview

Site area, zoning and limits for the chosen site, with figures for the area around it. Draw a section line on the plan in the Section tab below.

Diagrams

Recolour any panel; toggle use/age categories individually.

Background

Credits

When you use these diagrams, include this line.

Analysis

3D massing, sun and shadow, wind, thermal comfort and building mix for the same site and radius.

Analysis opens on a computer

3D massing, sun and shadow, wind, thermal comfort, section and building mix need a large screen and run calculations, so they don't open on a phone.

Address: sitedia.app
Site

Open this address on a computer, search the same site and make the diagrams.

Save this site to My places?

Building mass

Uses the site, radius and shape picked above; clipped at the boundary.

Generate the diagrams and the 3D model appears here

Drag to orbit · wheel to zoom · right-drag to pan.

Colour

Use Age Height Mono

Height exaggeration 1.0×

Ramp colour

Changes hue only — the tonal steps stay.

Colours and on/off by category

Ghost hidden

Ghost opacity 20%

Base plate Roads Green & water Terrain Site display

View

Complete model Exploded diagram

Ground, green, water, roads and buildings stacked into one exploded view — for report covers and concept diagrams.

Spread 60%

Complete model at base Split green and water

Buildings with no height or floor count are not built, so the count is lower than the flat panels. More →

Sun & shadow

Sun path and shadows on the same model as the mass view. Build the mass first.

3D model Sun hours map Shadow sweep

Generate the diagrams above and it appears here

Combined By hour

Drag to orbit · wheel to zoom · right-drag to pan.

Date

Summer solstice Equinox (Mar) Equinox (Sep) Winter solstice Now

Time 12:00

Shadows Sun path Hourly sun Compass dial Cast shadows only

View

Sun position is calculated from the site's latitude and longitude (GMT, no British Summer Time). Only standing buildings cast shadows — this is not a daylight and sunlight (BRE) assessment. More →

Wind

A wind rose for the nearest weather station — how often and how strongly the wind blows from each of 16 directions. These are observed frequencies, not a simulation.

Wind rose Simulation plan Simulation 3D

Pick a site and it appears here

Height

Period

Annual Spring Summer Autumn Winter

Speed bins Grid & compass

Wind simulation

GPU lattice-Boltzmann (LES), prevailing direction only — an early-design reference, not a validated wind microclimate assessment. Terrain comes from elevation data; trees are not in the model, and buildings with no known height are left out.

Regional wind from a station several km away, not measured on this site — use it to read the prevailing direction and season. More →

Thermal comfort

UTCI — how hot it actually feels where a person stands. Air temperature and humidity come from the weather file, wind from our own simulation, and sun and shade from the building model.

Pick a site and it appears here

Period

Summer Spring Autumn Winter Annual

Time

10:00 14:00 18:00

UTCI combines air temperature, humidity, wind and radiation into one felt temperature. 9–26 ℃ is comfortable; heat stress starts at 32 ℃.

Trees are assumed to be 8 m tall and pedestrian-level wind uses the 6 m value — compare places rather than quoting the numbers. More →

Layer stack

Lays the sheets out in axonometric and stacks them. Drag to reorder.

Press ‘Build stack’ and it appears here

Drag to reorder and the preview updates at once. Untick a layer to drop it.

Massing layer on top Vertical guides

Layer gap 100%

FitWheel to zoom

Sheet

Places the chosen sheets on one board. Pick paper, columns and legend, and it prints as shown.

Press ‘Compose’ and it appears here

Drag to reorder , and untick a sheet to drop it.

Paper

A4 A3 A2 A1 16:9

Orientation · columns

Width Height

2 col 3 col 4 col 6 col

Title

Panel titles Legend Scale bar Border

Section

Draw a section line on the plan to cut a section and skyline right below it. Vertical scale 1:1.

Generate the diagrams above and it appears here

Building heights Buildings

Looking North (red arrow on the plan)

Section line

East–west North–south Rotate at centre Draw

Click or drag on the plan to move the section line there.

Position Site centre

Angle 45°

Along this section

Show Height grid Tallest Lowest Ground elevation Scale bar End labels Site

Buildings cut by the lineBuildings behind (lighter = farther)GroundSite Building heights use the same data as the 3D massing · terrain from elevation data · nothing below ground (basements) is drawn.

Breakdown

How many buildings, and what share. Same data as the diagrams above — colours follow the palette you set there.

Bar Circle

Generate the diagrams to see this

Data Sources and reference dates for each dataset are in the table above · © OpenStreetMap contributors (ODbL) — Sources and gaps in detail
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sitedia · Terms and policies

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Creating diagrams and downloading PNGs is free.Creating diagrams and downloading PNGs is free.

Pro launch notice (Korea)

Effective 15 October 2026 (Korea)

From 15 October (Korea), features that needed a log-in move to the Pro pass. Until 14 October they stay free when you log in.

Still free: Generate and view 24 diagrams, download PNG (individually or all, 1000–4000px)
Pro: SVG, colours, background colour, the «Details» window, breakdown, 3D mass, DXF, sun & shadow, wind and thermal comfort
Price: 3 months ₩4,900 · 1 year ₩9,900 (no auto-renewal)

Early reservation benefitIf you reserve early by 14 October, your first pass lasts longer (3-month pass +2 weeks, 1-year pass +1 month). Early reservation alone doesn't charge you.

You've reserved early. On your first pass, the 3-month pass gets 2 extra weeks and the 1-year pass gets 1 extra month.

The terms of use also change on 15 October (Korea).

Pro pass

One-off payment · no auto-renewal · VAT included. Payment is handled in a new tab by Polar, our merchant of record. Pass details · Refunds

Pro early reservation

Until 14 October 2026

Pro passes go on sale in Korea on 15 October. Accounts that pre-registered get a longer first pass.

3-month pass₩4,9003 months + 2 weeks

1-year pass₩9,9001 year + 1 month

Pro: SVG, colours, background colour, the «Details» window, breakdown, 3D mass, DXF, sun & shadow, wind and thermal comfort
Still free: Generate and view 24 diagrams, download PNG (individually or all, 1000–4000px)
Method: One-off payment, no auto-renewal. Free features keep working after the period ends.

The reservation is made with the account you're logged into; reserving alone doesn't charge you. The extra time is added once, to the first pass you buy. · Pass details

Details open on a computer

The details window, with its building and area lists and search, is laid out for a computer screen.

Address: sitedia.app
Site

Open this address on a computer, search the same site and make the diagrams.

Save this site to My places?

What's new

2026.10.07

Lasso several parcels

In Parcel mode, press «Lasso several parcels» and click on the map to drop corners (click the first one again to close) — every parcel inside the shape is picked at once; parcels crossing its edge are left out. They add to what you already picked, up to 60 parcels per site.

Centre site marker

When you pick the site as a point, choose its centre marker — ▼ triangle, ● dot or ＋ cross — and set its size (40–200%) and colour. Untick «Show centre site marker» to hide it.

My places

Log in to save the site you picked to ☆ My places next to the map search — points, parcels and drawn boundaries included. Save it on your phone and open it on your computer with the same account. No Pro pass needed.

Site overview

Right under the map: the site's London Plan designations, plus building count, average height and the nearest station within the same radius. Pick parcels to get the site area. UK planning has no fixed coverage or plot-ratio caps — check the borough's Local Plan.

Analysis 05 · Section

Draw a line on the plan and the section and skyline along it appear right below, with the buildings it cuts and the tallest and lowest. Part of Pro — free to try on the example site.

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