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https://github.com/gwlucastrig/gridfourc

A C-language API with tools for raster data including geophysical applications and digital elevation models
https://github.com/gwlucastrig/gridfourc

autonomous-underwater-vehicle bathymetry c data-compression digital-elevation-model geospatial raspberry-pi uav uuv

Last synced: 24 days ago
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A C-language API with tools for raster data including geophysical applications and digital elevation models

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README 

          
# The Gridfour Software Project Port to C

A C library for raster data including scientific and geophysical applications.



## Welcome

Welcome to the Gridfour software project's port to the C programming language.  We are just getting

started and aspects of this project are still in flux.  Currently, we are focused on

a C-langage implementation of the GVRS API.



We are also working on support for smaller scale processors and single-board computers.

See our [project wiki](https://github.com/gwlucastrig/GridfourC/wiki) for information

about our performance testing in the Raspberry PI environment.



## What is GVRS?

The Gridfour Virtual Raster Store (GVRS, pronounced "givers") is a file-backed system

that provides memory-efficient access to large and very large raster (grid) data sets.

GVRS was created with three main purposes in mind:



**1. Authoring Data:** For applications that produce data sets, GVRS provides a high-performance

virtual management system for handling content. Applications may store their final results

in persisent GVRS files, or transcribe them to conventional formats (NetCDF, HDF5, TIFF and GeoTIFF, etc.).



**2. Experiments in Data Compression:**  GVRS provides a convenient testbed for developers

who are exploring new ways of performing data compression for raster data sources.



**3. Distribution:**  GVRS provides a light-weight API and data format suitable for distributing

data to other systems. GVRS was originally conceived as a way of providing environment data for small systems, 

single-board computers, and platforms such as Autonomous Underwater Vehicles. But it is a feasible

solution for many other use cases.



## Project Status

The original Gridfour project was implemented in Java. More information about the original implementation

is available at the [Gridfour Software Project](https://github.com/gwlucastrig/gridfour).



Currently, we have completed a version of GVRS that runs under Windows and Linux.

A cmake file is available for building the GVRS library. We are working on a series of how-to articles on

our [GridfourC wiki](https://github.com/gwlucastrig/GridfourC/wiki).  Got something you'd like to learn more about?

Let us know.



We recently completed features that allow the C API to write data to a GVRS data store.

The new GvrsBuilder functions provide a way to create new GVRS data stores that

may be written to and read from application code. We are currently adding functions

and data elements to make the API more complete and convenient to use.



We are also in the process of adding doxygen-style documentation to our primary header files.



## Documentation



Please see our Wiki page for more information on the C API.  



For the Gridfour project in general, we have two main documentation pages:



1. [The Gridfour Project Notes](https://gwlucastrig.github.io/GridfourDocs/notes/index.html) give information on

   the underlying concepts and algorithms used by this project. The Notes page isn't just about Gridfour.

   It covers ideas and topics related to raster data processing in general.



2. [The Gridfour Wiki](https://github.com/gwlucastrig/gridfour/wiki) gives lots of helpful information

   on using Gridfour software including our Gridfour Virtual Raster Store (GVRS). It also gives information

   about our project goals and roadmap.