Nemo
An Open Source Library
of Round-world Computational Primitives
User Guide and Reference Manual - C language implementation)
User Guide and Reference Manual - C language implementation)
The traditional method of numerical representation of geographic coordinates consists of angular latitude and longitude (φ and λ, respectively). This coordinate form is ill-suited for processing on a digital computer. Specifically, the implementer of any application that handles large volumes of wide area geographic data must find a solution to three fundamental software engineering problems:
Nemo library is a collection of C-language functions, that provides a path to the solution of those problems. It may work effectively for a large number of wide area or global geographical applications that are built using the following design strategy:
Effective use of the Library requires the unsrestanding of computational domains and coordinate systems used in geographical data processing.
| nemo_ArcToChordApprox() | Arc to approximate chord |
| nemo_ArcV3() | Spherical arc |
| nemo_Cc3ToEnr() | 3D radius vector to ellipsoid normal |
| nemo_CfsToEnr() | Conformal sphere to ellipsoid normal |
| nemo_ChordSqToArcApprox() | Square chord to approximate arc |
| nemo_ConicalDirect() | NCS to Conical map plane |
| nemo_ConicalInit() | Initialize conical projection |
| nemo_ConicalInverse() | Conical map plane to NCS |
| nemo_Dcos3ToLatLong() | Generic 3D vector to latitude/longitude |
| nemo_DeQueue() | Remove node from a queue |
| nemo_DirectionToAzimuth() | Azimuth (angle) from direction cosines |
| nemo_EllToNcs() | Ellipsoid latitude/longitude to NCS |
| nemo_EllipsoidChordDirect() | Direct problem of geodesy on ellipsoid |
| nemo_EllipsoidChordInverse() | Second problem of geodesy on ellipsoid |
| nemo_EllipsoidPrincipalRadii() | Meridian and Prime Vertical radii |
| nemo_EllipsoidRadius() | General ellipsoid curvature radius |
| nemo_ElrInit() | Initialize the ellipsoid parameters |
| nemo_ElrWgs84() | Provide static WGS84 ellipsoid parameters |
| nemo_EnQueue() | Add node to queue end |
| nemo_EnrToCc3() | Ellipsoid normal to 3D radius vector |
| nemo_EnrToCfs() | Ellipsoid normal to conformal sphere |
| nemo_EnrToNcs() | Ellipsoid normal to near conformal sphere |
| nemo_GeodesicSzpila() | Geodesic length using Vincenty formulae |
| nemo_GnomonicDirect() | NCS to Gnomonic map plane |
| nemo_GnomonicInit() | Initialize Gnomonic projection |
| nemo_GnomonicInverse() | Gnomonic map plane to NCS |
| nemo_LatLongToDcos3() | Latitude/longitude to generic vector |
| nemo_MeridianArcLength() | Meridian arc length |
| nemo_MidV3() | Find mid-vector in 3D space |
| nemo_NcsElrRadius() | Return ellipsoid radius for an NCS point |
| nemo_NcsElrScale() | Return mapping scale between NCS abd ellipsoid |
| nemo_NcsToEll() | NCS to ellipsoid latitude/longitude |
| nemo_NcsToEnr() | NCS to ellipsoid normal |
| nemo_NcsToU64() | NCS (3 doubles) to CDC (U8 integer) |
| nemo_NormalizeV2() | Normalize generic two-componenet vector |
| nemo_NormalizeV3() | Normalize generic three-componenet vector |
| nemo_OrthographicDirect() | NCS to Ortographic map plane |
| nemo_OrthographicInit() | Initialize ortographic projection |
| nemo_OrthographicInverse() | Ortographic map plane to NCS |
| nemo_PeekBottom() | Peek the stack bottom node |
| nemo_PeekTop() | Peek the stack top node |
| nemo_Pop() | Pop a node from stack |
| nemo_Push() | Push a node to stack |
| nemo_QueueInit() | Initialize stack anchor |
| nemo_QueuePeekFirst() | Peek the queue first node |
| nemo_QueuePeekLast() | Peek the queue last node |
| nemo_QueueSize() | Report the number of nodes in the queue |
| nemo_QueueVerify() | Verify queue |
| nemo_SphereChordCoords() | Spherical Abscissa and Ordinate |
| nemo_SphereChordDirect() | Direct problem of geodesy on sphere |
| nemo_SphereChordInverse() | Inverse problem of geodesy on sphere |
| nemo_SphereCircumcenter() | Find spherical circumcenter |
| nemo_SphereRandomLine() | Generate random line on unit sphere |
| nemo_SphereRandomPointGlobal() | Generate a random location on unit sphere |
| nemo_SphereRandomPointLocal() | Generate regional random point on unit sphere |
| nemo_SphereSegsXsct() | Intersection of two great circle segments |
| nemo_SphereTangentialPlane() | Principal vectors of tangential plane |
| nemo_StackInit() | Initialize stack anchor |
| nemo_StackInvert() | Inverted the order of nodes in a stack |
| nemo_StackSize() | Report the number of nodes on the stack |
| nemo_StackVerify() | Verify stack |
| nemo_StereographicDirect() | NCS to Stereographic map plane |
| nemo_StereographicInit() | Initialize Stereographic projection |
| nemo_StereographicInverse() | Stereographic map plane to NCS |
| nemo_StylindricalDirect() | NCS to Stylindrical map plane |
| nemo_StylindricalInit() | Initialize Stylindrical projection |
| nemo_StylindricalInverse() | Stylindrical map plane to NCS |
| nemo_U64ToNcs() | CDC (U8 integer) to NCS (3 doubles) |
| nemo_WorkMemAvailable() | Report the current size of free space |
| nemo_WorkMemCheck() | Check availability of workspace block |
| nemo_WorkMemGet() | Allocate workspace block |
| nemo_WorkMemInit() | Initialize workspace instance |
| nemo_WorkMemRevert() | Revert the state of workspace instance. |
| nemo_WorkMemUsedMax() | Report life-time maximum workspace use |
The content of this Reference Manual matches the Nemo Library source code published on date specified as NEMO_LIBRARY_DATE literal in the preamble of the included API header file, i.e., the date in the reference manual nemo.h and library source nemo.h must be the same.
Nemo Library is distributed in C language source code form, under 'BSD type' license, the full text of which can be found in the "license.text" file, co-resident with the source code files in the distribution archive. The text of license, with a short commentary, can be inspected here.
This Reference Manual is published under Creative Commons BY-ND 4.0 license. Author: Hrvoje Lukatela