Flight 2668/
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Canopy height: Version 2 High Resolution Canopy Height Maps by WRI and Meta was accessed in September 2026 from https://registry.opendata.aws/dataforgood-fb-forestsv2. Meta and World Resources Institute (WRI) - 2026. Version 2 High Resolution Canopy Height Maps (CHMv2). Source imagery for CHM © 2016 Vantor, licensed under CC BY 4.0. Where that is not yet in the database: ETH Global Canopy Height 2020, CC BY 4.0, from Lang, N., Jetz, W., Schindler, K. and Wegner, J. D. (2023), A high-resolution canopy height model of the Earth, Nature Ecology & Evolution. Both reduced to height bands by Altimeter Cloud. Ground height: Terrain Tiles (Mapzen / Tilezen, on AWS Open Data), reduced into resolution tiers by Altimeter Cloud: ArcticDEM terrain data DEM(s) were created from DigitalGlobe, Inc., imagery and funded under National Science Foundation awards 1043681, 1559691, and 1542736; Australia terrain data © Commonwealth of Australia (Geoscience Australia) 2017; Austria terrain data © offene Daten Österreichs – Digitales Geländemodell (DGM) Österreich; Canada terrain data contains information licensed under the Open Government Licence – Canada; Europe terrain data produced using Copernicus data and information funded by the European Union - EU-DEM layers; Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric Administration; Mexico terrain data source: INEGI, Continental relief, 2016; New Zealand terrain data Copyright 2011 Crown copyright (c) Land Information New Zealand and the New Zealand Government (All rights reserved); Norway terrain data © Kartverket; United Kingdom terrain data © Environment Agency copyright and/or database right 2015. All rights reserved; United States 3DEP (formerly NED) and global GMTED2010 and SRTM terrain data courtesy of the U.S. Geological Survey. Map and imagery credited on the view above.
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About sea-level pressure and QNH
Sea-level pressure is kept as given: the model’s own, or the figure entered from a forecast or report. QNH is that pressure the way an altimeter setting means it, through the standard atmosphere, and is what the adjusted apogee and the adjusted CSV use.
Model values, not observations. NOAA GFS: weather data by Open-Meteo.com (CC BY 4.0). Ensemble: NOAA GEFS.
Flights from this altimeter
Settings, as they were for this flight
Xcweather.co.uk is a decent place to grab pressures from for your location and time.
The altimeter keeps a constant average of the pressure while waiting for launch, it uses a simple algorithm and the pre-flight buffers to do this. The most recent 120 samples (~4 seconds) are ignored so your pre-trigger altitude won't effect the ground baseline.
For almost all uses we suggest keeping this on the 25 Meter (~82 feet) default settings. If you want to test your altimeter by throwing it in the air, or are planning a very low flight you may want to lower the setting.
The samples stable method waits for the devices altitude not to change for the set number of samples. This is defined by not changing by more than +/- 1.0 meters for 98% of the samples, it's a reliable method to stop the recording after landing within 8-10 seconds (300 sample) or 16-20 seconds (600 sample).
The sensor can run at 50 samples per second in 4X mode, so we suggest leaving it in this mode as it will offer the highest accuracy.
We suggest not setting this too high as it will cause delay to changes in altitude if set very high.
The Kalman filter uses a prediction step based on a system model and then a correction step using new measurements to refine its estimate, it creates accurate most certain results from data with noise in it.
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Chart snapshot
A PNG of the chart exactly as you have it set right now: the series you have switched on, your zoom, your labels and any pressure correction applied.
QR code
Links to this flight page. Useful on a range card or a club display.
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