ISO TR 11225-2012 PDF

Full title and description

Space environment (natural and artificial) — Guide to reference and standard atmosphere models. This Technical Report compiles practical information on selected reference and standard atmospheric models (Earth and planetary) used in aerospace engineering and research, summarizing model content, technical basis, databases, uncertainties, limitations and available computer code for widely used atmosphere models.

Abstract

ISO/TR 11225:2012 provides guidance for more than seventy reference and standard atmosphere models covering altitudes from surface level up to about 4 000 km. The report summarizes each model's scope, inputs, technical basis, known uncertainties and limitations, bibliographic references and (where available) pointers to implementation code, to help engineers and researchers select and compare atmosphere models for aerospace, geophysical and climatological applications.

General information

• Status: Published.
• Publication date: October 2012 (First edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 — Space systems and operations.
• Edition / version: Edition 1 (2012).
• Number of pages: 107 pages (technical report).

Scope

This Technical Report offers guidelines and concise summaries of selected global and regional reference and standard atmosphere models for engineering design and scientific research. It covers models intended for aerospace use (neutral atmosphere and related quantities) from surface level up to ~4 000 km, excluding purely local low‑altitude phenomena and large‑scale dynamical GCM studies; it is descriptive and comparative rather than normative (it does not endorse a single model).

Key topics and requirements

• Cataloguing of >70 Earth and planetary atmosphere models (global and regional) with short model summaries.
• Model content: variables covered (temperature, pressure, density, composition; winds or indices when available) and applicable altitude ranges.
• Documentation of model technical basis (empirical/theoretical/hybrid) and primary data sources.
• Discussion of model uncertainties, limitations and typical use cases (orbit drag, re‑entry, aerothermodynamics, climatology comparisons).
• Bibliographic references, dates of development, sponsoring organizations and pointers to available computer code or implementation sources where known.

Typical use and users

Typical users include aerospace and aircraft designers, space vehicle developers, mission planners and satellite operators (for orbit prediction, drag and re‑entry analyses), as well as geophysicists, meteorologists and climatologists who need standardized model summaries for comparison, model selection or interpretation of results across different atmosphere representations. The report is used when choosing models for engineering simulations, specifying inputs for analyses, or locating implementation references.

Related standards

Relevant and related ISO documents and references include:

- ISO 2533:1975 — Standard Atmosphere (historical standard for a defined standard atmosphere used in planning and testing).

- ISO 5878:1982 — Reference atmospheres for aerospace use (seasonal and regional reference atmosphere families, winds and humidity supplements).

- ISO 14222 (and later editions, e.g., 2022) — Space environment — Earth's atmosphere from ground level upward (complements TR 11225 by specifying accepted empirical atmosphere models and properties up to the exosphere).

Keywords

reference atmosphere; standard atmosphere; space environment; atmospheric models; CIRA; NRLMSISE; GRAM; thermosphere; density model; aerospace; orbit drag; model uncertainty.

FAQ

Q: What is this standard?

A: ISO/TR 11225:2012 is a Technical Report from ISO titled "Space environment (natural and artificial) — Guide to reference and standard atmosphere models" that compiles descriptive summaries and guidance on many reference and standard atmosphere models used in aerospace and planetary applications.

Q: What does it cover?

A: It covers descriptions of over seventy atmospheric models (Earth and planetary), the variables they represent, altitude applicability (surface to ~4 000 km), their data and technical bases, known uncertainties and limitations, bibliographic references and pointers to implementation code where available. The report is informational and comparative rather than prescriptive.

Q: Who typically uses it?

A: Aerospace engineers, spacecraft and mission designers, satellite operators, re‑entry and range safety analysts, as well as atmospheric scientists (geophysicists, meteorologists, climatologists) who require concise, comparative information when selecting or interpreting atmospheric models.

Q: Is it current or superseded?

A: ISO/TR 11225 was published in October 2012 as the first edition. As a Technical Report it is subject to ISO review cycles; users should check the ISO catalogue for the current status or any newer revisions or related standards (for example, activity on related atmosphere standards and drafts such as ISO/DIS 2533 and updates to ISO 14222). For the most authoritative lifecycle/status details consult ISO's records.

Q: Is it part of a series?

A: It is produced by ISO/TC 20 (Aircraft and space vehicles), SC 14 (Space systems and operations) and complements other ISO documents on atmospheric reference data (e.g., ISO 2533, ISO 5878 and ISO 14222). It stands as an informative Technical Report in the suite of space environment publications.

Q: What are the key keywords?

A: Reference atmosphere, standard atmosphere, atmospheric model, space environment, CIRA, NRLMSISE, GRAM, thermosphere, density, orbit drag.