Data & transparency

Viewpoint shows forecasts — cloud cover, weather, sun and moon positions — to help you plan. This page explains where that data comes from and, just as importantly, what it cannot tell you.

Where the data comes from

• Weather forecasts (cloud cover, temperature, wind, precipitation) come from a third-party weather service that serves numerical weather-model output, fetched through our backend.
• Sun and moon positions are calculated on the device from astronomical formulae — these are geometry, not a forecast, and are reliable.

What a forecast can and cannot do

Cloud and weather figures are the output of mathematical models run on a grid. That has real limits:

• Grid resolution. A model reports one value for a whole grid cell — often kilometres across. A valley, a ridge, or a single cloud bank smaller than the cell is not resolved. Viewpoint shows the active model and its resolution (for example ICON-D2 2.2 km) so you can judge how fine the data is.
• Terrain. The models do not fully account for local terrain — shadowing, valley fog, a peak catching light the forecast cannot see.
• Time. Accuracy falls off the further out the forecast reaches.

Use it as a guide, not a guarantee

All forecasts, environmental data, and spatial calculations in Viewpoint are provided on an “as-is” and “as-available” basis. They are planning aids. Real conditions in the field can and do differ.

Your safety is your responsibility. Do not rely on Viewpoint for decisions where weather or terrain carries real risk — check authoritative local forecasts and conditions, and use your own judgement. See the weather-accuracy disclaimer.