Trekking and Mountaineering Terminology
Acronyms, abbreviations, and technical terms with expansion and operational meaning for developers integrating data and services in the hiking and mountaineering domain.
AINEVA
Associazione INterregionale NEva e VAlanghe (Italy's inter-regional snow and avalanche association). Coordinates the snow pack monitoring network and publishes avalanche bulletins for the Italian alpine regions. Data available at aineva.eu with twice-weekly updates during winter season.
AMS (Acute Mountain Sickness)
Altitude-related illness caused by reduced oxygen pressure at high elevations. Symptoms appear above 2,500 m: headache, nausea, fatigue, dizziness. Informational: progressive ascent (≤500 m/day above 3,000 m) reduces risk. Not to be confused with HACE (High Altitude Cerebral Edema) or HAPE (High Altitude Pulmonary Edema), which are medical emergencies.
ARPA
Agenzia Regionale Protezione Ambiente (Italian Regional Environmental Protection Agency). Regional public body managing environmental monitoring networks (meteorological, hydrological, snow). ARPA regional agencies publish open data via API: ARPA Lombardia, ARPA Piemonte, ARPA Veneto, ARPA Toscana.
BIV / Bivouac
A fixed unmanned high-altitude shelter for emergency stops. In mountaineering jargon, "bivouacking" also refers to unplanned outdoor overnight stays. OSM tag: tourism=alpine_hut or shelter_type=bivouac for unmanned shelters.
CAI
Club Alpino Italiano (Italian Alpine Club). Founded 1863, manages 60,000+ km of marked trails in Italy. Publishes hiking difficulty scales (T/E/EE/EEA) and mountaineering difficulty scales. Website: cai.it.
CNSAS
Corpo Nazionale Soccorso Alpino e Speleologico (National Alpine and Cave Rescue Corps, Italy). Component of CAI, coordinates over 5,000 volunteer technicians in 25 alpine regions. Emergency number: 112 (European) or 118 (medical emergency).
DAV
Deutscher Alpenverein (German Alpine Club). World's largest mountaineering association by membership (1.5+ million). Publishes the Alpenvereinskarte (1:25,000 alpine cartography) covering the Alps, standard reference for Austria and Bavaria.
DEM
Digital Elevation Model. A digital representation of terrain surface as a raster grid of elevation values. Key open-source DEMs: SRTM 1 arc-second (30 m, NASA/USGS), EU-DEM 1.0 (25 m, Copernicus EEA), CNR-IRPI LiDAR 2 m (Italy). Used for elevation profiles, slope analysis, viewshed computation.
D+
Positive elevation gain. The sum of all uphill sections of a route, expressed in metres. Primary parameter for estimating walking time and physical effort.
D–
Negative elevation gain (elevation loss). The sum of all downhill sections of a route. Relevant for joint load (knees, ankles) and estimating return time.
EAWS
European Avalanche Warning Services. Federation standardizing avalanche bulletins across Europe using a 5-level danger scale: 1 Low, 2 Limited, 3 Considerable, 4 High, 5 Very High. API available at avalanches.org.
EPSG
European Petroleum Survey Group (now IOGP). The EPSG code is a numeric identifier for spatial reference systems. EPSG:4326 = WGS84 (geographic coordinates); EPSG:32632 = WGS84 / UTM zone 32N (northern Italy); EPSG:32633 = WGS84 / UTM zone 33N (central/southern Italy).
GeoJSON
RFC 7946 open standard for representing geographic features in JSON format. Objects include Feature (single entity with geometry + properties) and FeatureCollection (array of features). Geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon. Standard format for outdoor REST APIs.
GIS
Geographic Information System. System for acquiring, managing, analyzing, and displaying georeferenced geographic data. Open-source software: QGIS, GRASS GIS. Used in trekking for route analysis, custom map creation, isochrone calculation, and viewshed analysis.
GNSS
Global Navigation Satellite System. Collective term for all satellite positioning constellations: GPS (USA), GLONASS (Russia), Galileo (EU), BeiDou (China). Multi-constellation GNSS receivers achieve <3 m precision under standard conditions.
GPX
GPS Exchange Format. Open XML format for GPS data (tracks, waypoints, routes). Main elements:
GR (Grande Randonnée)
Long-distance hiking trail classified by the FFRandonnée (France). Marked with white-and-red stripes. Examples: GR10 (Pyrenees), GR20 (Corsica, considered the most demanding long-distance trail in Europe).
HAPE
High Altitude Pulmonary Edema. Serious altitude-related illness with accumulation of fluid in the lungs. A medical emergency requiring immediate descent. Informational mention only - this knowledge pack does not provide medical guidance.
HUT
Mountain hut / alpine hut. High-altitude accommodation in English. OSM tag: amenity=alpine_hut. Distinguished from tourism=camp_site (campsite) and tourism=hostel (valley hostel).
IGM
Istituto Geografico Militare (Italian Military Geographic Institute). Italy's official cartographic authority, producing the 1:25,000, 1:50,000, and 1:100,000 series. Download/purchase: igmi.org.
KML
Keyhole Markup Language. XML format for geographic data used by Google Earth/Maps. Competing format with GPX for waypoints and routes. The
LiDAR
Light Detection and Ranging. Laser remote sensing technology for generating high-resolution DEMs (1–2 m). Source of the most precise DEMs available for Italy (National Geoportal, IGM extraordinary LiDAR survey). Useful for identifying trails, structures, and alpine morphology in 3D models.
MSAS / MNT
Mean Sea Level (Livello Medio del Mare) / Modello Numerico del Terreno. MSAS is the reference datum for altitude measurements. MNT is the Italian acronym for Digital Terrain Model (equivalent to DEM).
OSM
OpenStreetMap. Collaborative open geographic database (ODbL license) with global coverage of trails. Hiking routes tagged with route=hiking, network=lwn/rwn/nwn (local/regional/national). Access APIs: Overpass API (overpass-api.de), Nominatim (nominatim.openstreetmap.org).
POI
Point of Interest. A georeferenced waypoint associated with contextual information (name, category, hours). In trekking: mountain huts, bivouacs, springs, trail junctions, scenic viewpoints, parking.
SAC
Swiss Alpine Club (Club Alpin Suisse/Schweizer Alpen-Club). Hiking difficulty scale SAC-CAS T1–T6: T1 Hiking, T2 Mountain hiking, T3 Demanding mountain hiking, T4 Alpine hiking, T5 Demanding alpine hiking, T6 Difficult alpine hiking.
SAR
Search and Rescue. Mountain rescue operations. In Italy coordinated by CNSAS; in the Alpine Arc also by national alpine rescue organizations (ÖBRD in Austria, SAC/REGA in Switzerland).
SRTM
Shuttle Radar Topography Mission. NASA mission (February 2000) producing a global DEM at 30 m (1 arc-second). Freely available at earthexplorer.usgs.gov.
TOPO
Abbreviation for topography or "route topo": a schematic diagram of a mountaineering or climbing route with grades, belay stations, and terrain characteristics. Digital topos distributed as PDF/SVG or as overlay layers on GIS maps.
UIAA
Union Internationale des Associations d'Alpinisme. International federation founded in 1932 uniting mountaineering associations from 60+ countries. Publishes safety standards for equipment (dynamic ropes, helmets, harnesses) and difficulty scales for rock and ice.
UTM
Universal Transverse Mercator. A planar Cartesian coordinate system dividing Earth into 60 zones of 6° each. Italy: zone 32N (EPSG:32632) and zone 33N (EPSG:32633). Coordinates expressed in metres (Easting, Northing) on WGS84 datum.
VF
Via Ferrata (abbreviated). Protected route on rock with metal rungs, steps, and fixed steel cable. Hüsler difficulty scale: F–ED. Requires lanyard with energy absorber (EN 958), helmet (EN 12492), and appropriate footwear.
WGS84
World Geodetic System 1984. Global geodetic reference system used by all GPS systems. All GPS coordinates in decimal degrees implicitly reference WGS84 unless otherwise stated. EPSG:4326.
WPLS
Weather Protection Level System. International standard for classifying outdoor garment water resistance (ISO 811: hydrostatic pressure in mm) and breathability (MVTR: g/m²/24h). Relevant for developers of weather-responsive clothing recommendation apps.