GPS · GNSS · SPACE · GEODESY

About OG2.org

An online engineering resource for satellite navigation, GPS and GNSS positioning, coordinate transformations, orbital mechanics, geodesy and geospatial calculations.

Explore Engineering Tools About the Platform

About Our GPS and Satellite Engineering Platform

What is OG2.org?

OG2.org is an online technical resource focused on Global Positioning System (GPS), Global Navigation Satellite Systems (GNSS), satellite engineering, coordinate systems, geodesy and geospatial technology.

The platform brings together browser-based engineering calculators, coordinate converters, positioning utilities, satellite calculations and technical resources in one accessible environment.

Our intended audience includes engineers, surveying professionals, GIS specialists, developers, students, researchers, radio communication enthusiasts and anyone working with geographic positioning and satellite navigation.

We aim to make technical calculations easier to access and understand through practical tools, transparent methods and useful engineering explanations.

Our Focus

  • Satellite navigation
  • GPS and GNSS positioning
  • Coordinate transformations
  • Orbital mechanics
  • Geodesy and GIS
  • RF and signal engineering
  • Navigation mathematics
460 Directory entries
16 Published PHP tools
15 Engineering categories
444 Planned directory entries

Our Engineering and Technology Areas

OG2.org covers interconnected fields in satellite navigation, positioning, geospatial analysis and communications engineering.

GPS and GNSS

Positioning, navigation, satellite geometry, DOP, RTK, pseudorange, positioning accuracy and GNSS error analysis.

Geodesy and Coordinates

WGS84, ECEF, LLA, UTM, MGRS, geographic datums, ellipsoids, geoid models and coordinate transformations.

Satellite Engineering

Orbital periods, orbital velocity, satellite coverage, tracking, Keplerian mechanics and constellation calculations.

RF and Signal Propagation

Signal delay, frequency, wavelength, Doppler shift, free-space path loss, antenna gain and link budgets.

GIS and Mapping

Map projections, coordinate reference systems, geospatial measurements, polygon calculations and spatial analysis.

GPS Time Systems

GPS time, UTC, TAI, Unix timestamps, Julian dates, leap seconds and clock synchronization.

GPS, GNSS and Satellite Engineering Tools Directory

Browse the engineering tools and technical directories organized by subject. Available tools link directly to their PHP pages. Other entries are development candidates and are activated automatically when their corresponding files are published.

Published PHP files are clickable Missing files are planned entries

GPS & GNSS Navigation

30 entries
GPS Distance Calculator Coordinate Converter GPS Velocity Calculator GPS Error Estimator DOP Calculator (Dilution of Precision) GPS Week Number Converter
GPS Position Calculator Planned
GPS Accuracy Calculator Planned
GPS Signal Strength Calculator Planned
GPS Satellite Visibility Calculator Planned
GPS Position Error Calculator Planned
GPS Navigation Calculator Planned
GPS Coordinate Averaging Tool Planned
GPS Track Distance Calculator Planned
GPS Speed and Distance Calculator Planned
GPS Fix Quality Analyzer Planned
GPS Dilution of Precision Analyzer Planned
GPS Accuracy Improvement Calculator Planned
GPS Position Uncertainty Calculator Planned
GPS Fix Time Estimator Planned
GPS Data Analyzer Planned
GPS Antenna Calculator Planned
GPS Waypoint Calculator Planned
GPS Track Analyzer Planned
GPS Route Planner Planned
GPS Position Interpolation Tool Planned
GPS Coordinate Validation Tool Planned
GPS Location History Analyzer Planned
GPS NMEA Data Viewer Planned
GPS Position Simulator Planned

Coordinate Conversion & Reference Systems

30 entries
WGS84 Coordinate Converter Planned
Latitude Longitude Converter Planned
ECEF to LLA Converter
LLA to ECEF Converter Planned
UTM Coordinate Converter Planned
UTM Zone Finder Planned
MGRS Coordinate Converter Planned
DMS to Decimal Degrees Converter Planned
Decimal Degrees to DMS Converter Planned
Geographic Coordinate Converter Planned
Cartesian Coordinate Converter Planned
Geodetic Coordinate Converter Planned
ENU Coordinate Converter Planned
ECEF to ENU Converter Planned
ENU to ECEF Converter Planned
Geocentric Coordinate Converter Planned
Geographic to Cartesian Converter Planned
Cartesian to Geographic Converter Planned
WGS84 to ETRS89 Converter Planned
WGS84 to NAD83 Converter Planned
Datum Transformation Calculator Planned
Coordinate Reference System Finder Planned
EPSG Code Finder Planned
EPSG Coordinate Converter Planned
Coordinate Format Converter Planned
Coordinate Precision Calculator Planned
Bulk Coordinate Converter Planned
Coordinate Transformation Calculator Planned
Geographic Coordinate Validator Planned
Coordinate Decimal Precision Tool Planned

Geodesy & Earth Measurement

30 entries
Geoid Height Calculator
Haversine Distance Calculator Planned
Vincenty Distance Calculator Planned
Great Circle Distance Calculator Planned
Geodesic Distance Calculator Planned
Bearing Calculator Planned
Azimuth Calculator Planned
Destination Point Calculator Planned
Geographic Midpoint Calculator Planned
Earth Radius Calculator Planned
Earth Curvature Calculator Planned
Distance Across Earth Calculator Planned
Geodesic Area Calculator Planned
Polygon Area Calculator Planned
Geographic Perimeter Calculator Planned
Ellipsoid Calculator Planned
Reference Ellipsoid Converter Planned
Flattening Calculator Planned
Eccentricity Calculator Planned
Meridian Arc Calculator Planned
Prime Vertical Radius Calculator Planned
Meridian Radius Calculator Planned
Geodetic Latitude Calculator Planned
Geocentric Latitude Calculator Planned
Geoid Undulation Calculator Planned
Height Above Ellipsoid Calculator Planned
Geodetic Height Converter Planned
Earth Surface Distance Calculator Planned
Geodetic Line Calculator Planned
Geodesy Unit Converter Planned

Satellite Tracking & Orbital Mechanics

40 entries
Satellite Position Calculator Orbital Period Calculator Satellite Coverage Area Calculator
Satellite Orbit Calculator Planned
Orbital Velocity Calculator Planned
Satellite Pass Predictor Planned
Satellite Tracking Calculator Planned
Satellite Ground Track Calculator Planned
LEO Orbit Calculator Planned
MEO Orbit Calculator Planned
GEO Orbit Calculator Planned
Geostationary Orbit Calculator Planned
Orbital Altitude Calculator Planned
Orbital Eccentricity Calculator Planned
Orbital Inclination Calculator Planned
Kepler Equation Solver Planned
Kepler Orbit Calculator Planned
Kepler Third Law Calculator Planned
Vis-Viva Equation Calculator Planned
Escape Velocity Calculator Planned
Circular Orbit Velocity Calculator Planned
Transfer Orbit Calculator Planned
Hohmann Transfer Calculator Planned
Orbital Maneuver Calculator Planned
Delta-V Calculator Planned
Rocket Equation Calculator Planned
Tsiolkovsky Equation Calculator Planned
Orbital Energy Calculator Planned
Orbital Angular Momentum Calculator Planned
Satellite Decay Calculator Planned
Atmospheric Drag Calculator Planned
Two Body Orbit Simulator Planned
Three Body Problem Simulator Planned
Satellite Constellation Calculator Planned
Walker Constellation Calculator Planned
Satellite Revisit Time Calculator Planned
Satellite Footprint Calculator Planned
Satellite Swath Width Calculator Planned
Satellite Look Angle Calculator Planned
Ground Station Visibility Calculator Planned

GNSS Constellations & Positioning

30 entries
GNSS Position Calculator Planned
GNSS Accuracy Calculator Planned
GNSS Signal Analyzer Planned
GNSS Satellite Geometry Calculator Planned
GNSS Error Budget Calculator Planned
GNSS Multipath Error Calculator Planned
GNSS Ionospheric Delay Calculator Planned
GNSS Tropospheric Delay Calculator Planned
GNSS Clock Error Calculator Planned
GNSS Carrier Phase Calculator Planned
GNSS Pseudorange Calculator Planned
GNSS Doppler Calculator Planned
GNSS Observation Calculator Planned
GNSS Availability Calculator Planned
GNSS Integrity Calculator Planned
GNSS Reliability Calculator Planned
GNSS RAIM Calculator Planned
GNSS SBAS Calculator Planned
GNSS GBAS Calculator Planned
RTK Accuracy Calculator Planned
RTK Baseline Calculator Planned
RTK Positioning Calculator Planned
PPP Positioning Calculator Planned
DGPS Accuracy Calculator Planned
Differential GPS Calculator Planned
GPS Galileo Comparison Tool Planned
GLONASS Calculator Planned
BeiDou Calculator Planned
Galileo Satellite Calculator Planned
Multi GNSS Calculator Planned

RF, Radio & Signal Propagation

30 entries
Signal Travel Time Calculator
Free Space Path Loss Calculator Planned
Doppler Shift Calculator Planned
RF Link Budget Calculator Planned
Fresnel Zone Calculator Planned
Radio Horizon Calculator Planned
Line of Sight Calculator
Signal Wavelength Calculator Planned
Frequency to Wavelength Converter Planned
Wavelength to Frequency Converter Planned
Radio Frequency Converter Planned
Decibel Calculator Planned
dBm to Watts Converter Planned
Watts to dBm Converter Planned
Signal Attenuation Calculator Planned
RF Power Calculator Planned
Antenna Gain Calculator Planned
Antenna Length Calculator Planned
Effective Isotropic Radiated Power Calculator Planned
Received Signal Strength Calculator Planned
Signal to Noise Ratio Calculator Planned
Carrier to Noise Ratio Calculator Planned
Noise Figure Calculator Planned
Thermal Noise Calculator Planned
Radio Propagation Calculator Planned
Two Ray Ground Reflection Calculator Planned
Path Loss Exponent Calculator Planned
RF Impedance Calculator Planned
RF Cable Loss Calculator Planned
RF Bandwidth Calculator Planned

GPS Time & Synchronization

30 entries
Time Conversion Tool
GPS Time Converter Planned
GPS Week Converter
GPS Week Rollover Calculator Planned
GPS Seconds Converter Planned
GPS Epoch Converter Planned
UTC to GPS Time Converter Planned
GPS to UTC Time Converter Planned
Unix Timestamp Converter Planned
Julian Date Converter Planned
Modified Julian Date Converter Planned
Leap Second Calculator Planned
TAI to UTC Converter Planned
UTC to TAI Converter Planned
Sidereal Time Calculator Planned
Local Sidereal Time Calculator Planned
Solar Time Calculator Planned
Time Zone Converter Planned
GNSS Time System Converter Planned
BeiDou Time Converter Planned
Galileo System Time Converter Planned
GLONASS Time Converter Planned
Clock Drift Calculator Planned
Clock Offset Calculator Planned
Clock Stability Calculator Planned
Frequency Stability Calculator Planned
Time Synchronization Calculator Planned
Time Difference Calculator Planned
Relativistic Time Correction Calculator Planned
Light Time Correction Calculator Planned

Visibility, Terrain & Navigation

30 entries
Elevation Mask Angle Calculator
Horizon Distance Calculator Planned
Geometric Horizon Calculator Planned
Radio Line of Sight Calculator Planned
Terrain Visibility Calculator Planned
Viewshed Analysis Tool Planned
Observer Height Calculator Planned
Target Visibility Calculator Planned
Obstruction Angle Calculator Planned
Satellite Elevation Calculator Planned
Satellite Azimuth Calculator Planned
Satellite Look Direction Calculator Planned
Ground Station Look Angle Calculator Planned
Visibility Window Calculator Planned
Navigation Waypoint Calculator Planned
Course Over Ground Calculator Planned
Speed Over Ground Calculator Planned
Cross Track Error Calculator Planned
Along Track Distance Calculator Planned
Navigation Bearing Calculator Planned
Navigation ETA Calculator Planned
Great Circle Route Planner Planned
Rhumb Line Calculator Planned
Rhumb Line Distance Calculator Planned
Marine Navigation Calculator Planned
Aircraft Navigation Calculator Planned
Dead Reckoning Calculator Planned
Position Fix Calculator Planned
Navigation Accuracy Estimator Planned
Navigation Coordinate Calculator Planned

Mapping, GIS & Geospatial Analysis

30 entries
Map Scale Calculator Planned
Map Distance Calculator Planned
Map Coordinate Calculator Planned
Geospatial Area Calculator Planned
GIS Coordinate Converter Planned
GIS Distance Calculator Planned
GIS Buffer Calculator Planned
GIS Polygon Calculator Planned
GIS Area Calculator Planned
GIS Raster Calculator Planned
Raster Resolution Calculator Planned
Ground Sampling Distance Calculator Planned
Pixel to Ground Distance Calculator Planned
Map Projection Calculator Planned
Mercator Projection Calculator Planned
Transverse Mercator Calculator Planned
Lambert Conformal Conic Calculator Planned
Albers Equal Area Calculator Planned
Web Mercator Converter Planned
Geographic Bounding Box Calculator Planned
Bounding Circle Calculator Planned
Geospatial Buffer Distance Calculator Planned
Polygon Centroid Calculator Planned
Point in Polygon Calculator Planned
Polygon Intersection Calculator Planned
Coordinate Grid Generator Planned
Geospatial Unit Converter Planned
GeoJSON Viewer Planned
GeoJSON Validator Planned
KML Coordinate Converter Planned

Surveying & Land Measurement

30 entries
Land Area Calculator Planned
Surveying Distance Calculator Planned
Surveying Bearing Calculator Planned
Traverse Calculator Planned
Closed Traverse Calculator Planned
Open Traverse Calculator Planned
Leveling Calculator Planned
Differential Leveling Calculator Planned
Height of Instrument Calculator Planned
Reduced Level Calculator Planned
Contour Interval Calculator Planned
Slope Distance Calculator Planned
Horizontal Distance Calculator Planned
Vertical Angle Calculator Planned
Survey Coordinate Calculator Planned
Stakeout Coordinate Calculator Planned
Azimuth to Bearing Converter Planned
Bearing to Azimuth Converter Planned
Triangulation Calculator Planned
Trilateration Calculator Planned
Resection Calculator Planned
Intersection Survey Calculator Planned
Cut and Fill Calculator Planned
Earthwork Volume Calculator Planned
Cross Section Area Calculator Planned
Survey Closure Error Calculator Planned
Survey Precision Calculator Planned
Total Station Calculator Planned
Theodolite Calculator Planned
GNSS Survey Planning Calculator Planned

Satellite Communications & Antennas

30 entries
Satellite Dish Angle Calculator Planned
Satellite Azimuth Elevation Calculator Planned
Satellite Dish Alignment Tool Planned
Satellite Link Budget Calculator Planned
Satellite Communication Delay Calculator Planned
Satellite Uplink Calculator Planned
Satellite Downlink Calculator Planned
Satellite Frequency Calculator Planned
Satellite Bandwidth Calculator Planned
Satellite EIRP Calculator Planned
Satellite G/T Calculator Planned
Satellite Antenna Gain Calculator Planned
Parabolic Dish Gain Calculator Planned
Parabolic Dish Diameter Calculator Planned
Antenna Beamwidth Calculator Planned
Antenna Polarization Calculator Planned
Link Margin Calculator Planned
Fade Margin Calculator Planned
Rain Fade Calculator Planned
Atmospheric Attenuation Calculator Planned
Satellite Footprint Width Calculator Planned
Transponder Bandwidth Calculator Planned
Symbol Rate Calculator Planned
Data Rate Calculator Planned
Modulation Efficiency Calculator Planned
Shannon Capacity Calculator Planned
Bit Error Rate Calculator Planned
Satellite Latency Calculator Planned
Geostationary Delay Calculator Planned
Satellite Network Availability Calculator Planned

Remote Sensing & Earth Observation

30 entries
Ground Sampling Distance Calculator Planned
Remote Sensing Resolution Calculator Planned
Satellite Image Resolution Calculator Planned
Swath Width Calculator Planned
Imaging Footprint Calculator Planned
Satellite Revisit Interval Calculator Planned
Off Nadir Angle Calculator Planned
Incidence Angle Calculator Planned
Look Angle Calculator Planned
Sun Synchronous Orbit Calculator Planned
Local Solar Time Calculator Planned
NDVI Calculator Planned
EVI Calculator Planned
SAVI Calculator Planned
NDWI Calculator Planned
NDBI Calculator Planned
Image Pixel Area Calculator Planned
Image Ground Footprint Calculator Planned
Remote Sensing Band Converter Planned
Satellite Image Scale Calculator Planned
Image Overlap Calculator Planned
Photogrammetry Scale Calculator Planned
GSD Flight Height Calculator Planned
Drone Coverage Calculator Planned
Drone Flight Time Calculator Planned
Drone Ground Resolution Calculator Planned
Image Georeferencing Calculator Planned
Raster Cell Size Calculator Planned
Digital Elevation Model Calculator Planned
Remote Sensing Index Converter Planned

Engineering Mathematics & Navigation Physics

30 entries
Vector Distance Calculator Planned
3D Vector Calculator Planned
Vector Projection Calculator Planned
Vector Normalization Calculator Planned
Vector Magnitude Calculator Planned
Dot Product Calculator Planned
Cross Product Calculator Planned
Rotation Matrix Calculator Planned
Quaternion Calculator Planned
Euler Angle Converter Planned
Coordinate Rotation Calculator Planned
2D Transformation Calculator Planned
3D Transformation Calculator Planned
Kalman Filter Calculator Planned
Extended Kalman Filter Calculator Planned
Position Estimation Simulator Planned
Least Squares Calculator Planned
Weighted Least Squares Calculator Planned
Linear Regression Calculator Planned
Error Propagation Calculator Planned
Measurement Uncertainty Calculator Planned
Standard Deviation Calculator Planned
Root Mean Square Error Calculator Planned
Mean Absolute Error Calculator Planned
Covariance Matrix Calculator Planned
Correlation Matrix Calculator Planned
Probability Calculator Planned
Gaussian Distribution Calculator Planned
Monte Carlo Simulation Tool Planned
Numerical Integration Calculator Planned

GNSS Data, Formats & Developer Utilities

30 entries
NMEA Sentence Decoder Planned
NMEA Data Parser Planned
NMEA Checksum Calculator Planned
NMEA Coordinate Converter Planned
NMEA 0183 Viewer Planned
RINEX File Analyzer Planned
RINEX Header Viewer Planned
RINEX Observation Calculator Planned
RINEX Epoch Converter Planned
SP3 Orbit File Viewer Planned
Navigation Message Decoder Planned
GPS Navigation Data Analyzer Planned
GNSS Log Analyzer Planned
GNSS CSV Viewer Planned
Coordinate CSV Converter Planned
GPX Viewer Planned
GPX Distance Analyzer Planned
GPX Coordinate Converter Planned
KML Viewer Planned
KML Validator Planned
GeoJSON Coordinate Extractor Planned
GeoJSON Converter Planned
WKT Geometry Viewer Planned
WKT Converter Planned
EPSG Database Lookup Planned
Coordinate API Tester Planned
GNSS Data Format Converter Planned
GPS Log Converter Planned
Satellite TLE Viewer Planned
TLE Orbital Data Converter Planned

Atmospheric, Ionospheric & Space Environment

30 entries
Ionospheric Delay Calculator Planned
Tropospheric Delay Calculator Planned
TEC Calculator Planned
Total Electron Content Converter Planned
Klobuchar Model Calculator Planned
Saastamoinen Model Calculator Planned
NeQuick Model Calculator Planned
Atmospheric Refraction Calculator Planned
Atmospheric Pressure Calculator Planned
Air Density Calculator Planned
Speed of Sound Calculator Planned
Radio Refractivity Calculator Planned
Atmospheric Delay Estimator Planned
Space Weather Index Converter Planned
Kp Index Viewer Planned
Solar Flux Converter Planned
Sun Position Calculator Planned
Solar Elevation Calculator Planned
Solar Azimuth Calculator Planned
Solar Zenith Angle Calculator Planned
Sunrise Sunset Calculator Planned
Day Length Calculator Planned
Satellite Solar Eclipse Calculator Planned
Earth Shadow Calculator Planned
Spacecraft Radiation Calculator Planned
Magnetic Declination Calculator Planned
Earth Magnetic Field Calculator Planned
Geomagnetic Coordinate Converter Planned
Geomagnetic Storm Analyzer Planned
Solar Radiation Calculator Planned
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Engineering Methods and Calculation Principles

Engineering calculations depend on their mathematical models, input parameters, coordinate reference systems and assumptions. Different applications can require different levels of precision and different computational methods.

Relevant methods across the OG2.org subject areas include geodetic transformations, spherical and ellipsoidal distance calculations, Keplerian orbital equations, satellite visibility geometry, radio propagation models, numerical methods and statistical error estimation.

Users should verify the reference systems, units, model assumptions and input data used by individual tools before applying their results to surveying, navigation, scientific research or operational engineering.

Online calculators are intended as practical engineering aids. They do not replace certified surveying procedures, authoritative navigation products or professional engineering validation where these are required.

Research and Development

The OG2.org directory is designed to grow as new engineering calculators, interactive simulators and technical resources are developed.

Potential development areas include advanced GNSS data analysis, RINEX processing, satellite constellation visualization, orbit simulation, navigation algorithms, geospatial data conversion and remote sensing calculations.

Directory entries marked as planned should not be interpreted as currently available software. Their availability depends on the publication of the corresponding tool.

Frequently Asked Questions

What is OG2.org?

OG2.org is an online engineering resource focused on GPS, GNSS, satellite navigation, geodesy, coordinate conversion, orbital mechanics and geospatial calculations.

What types of GPS and GNSS calculators are available?

The directory includes GPS distance, velocity, positioning error, coordinate conversion, DOP, satellite position and GPS time tools, subject to individual tool availability.

Can I convert coordinates between ECEF, LLA and UTM?

OG2.org includes coordinate transformation tools for geographic and Cartesian reference systems. Available conversions depend on the published calculators and their supported reference systems.

Are all tools in the directory currently available?

No. A tool is clickable only when its corresponding PHP file exists on the server. Entries without published files are displayed as planned tools.

Who can use OG2.org?

Engineers, students, researchers, developers, GIS professionals, surveyors and satellite navigation enthusiasts can use the platform's relevant technical resources.

Are online calculation results suitable for professional use?

Results depend on the accuracy of the input data, selected model and assumptions. Users should independently validate calculations when professional, safety-critical or regulatory applications require it.

Contact OG2.org

For questions, technical feedback, corrections, suggestions or enquiries concerning the platform and its tools, contact our website administration.

admin@og2.org