# Safidy Rat

Geophysical data processing and analysis

GNSS data collection and processing

Photogrammetry

Software development

GIS software programmer

**Equi Processing** is a QGIS plugin that generates an equidistance line between two lines. It is primarily used for marine boundary delimitation.The median line or the equidistance line is created by using :

Delaunay triangulation: about the algorithme.

TALOS guidelines: here

here is an other interactive Javascript implementation of the Fortune algorithm that computes Voronoi diagrams. We can visualize how spaceĀ isĀ divided based on point location

**Select PB state_A:** Baseline Points of the state A

**Select PB state_B:** Baseline Points of the state B

**Algorithm direction:** general trend of the Baselines (South-North or West-ESt)

**Tripoints:** represents 3 lines from a Median Point that is equidistance to 3 BasePoints

**Median_Line:** is drawn using all Median Points and represents the Equidistance line

**Coordinate Systeme:**

When working with geographic data and geometry, it is important to use a projected coordinate system that preserves distances. The Universal Transverse Mercator (UTM) is a common choice, but working with data across multiple UTM zones can be complicated.Instead, the Transverse Mercator projection can be used, which is based on a user-defined base point location. The Transverse Mercator projection is the most widely used projected coordinate system for world topographical and offshore mapping, and has several different forms that all share the same basic characteristics and formulas. The differences between these forms arise from variations in the choice of coordinate transformation parameters, such as the latitude and longitude of the origin (central meridian), the scale factor at the origin (on the central meridian), and the values of False Easting and False Northing.The Transverse Mercator projection is designed to minimize distortion along the central meridian, which is chosen by the user of the projection as the reference line. All other points on the map are plotted relative to this line, with distortion increasing as one moves further away from it. This makes the Transverse Mercator projection well-suited for large-scale maps and mapping areas with significant east-west extent, such as countries or large continents.One example of the Transverse Mercator projection formula is:+proj=tmerc +lat0=-27.12 +lon0=32.92 +k=1 +x0=0 +y0=0 +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crsIn this example, the center of projection is located at -27.12 latitude and 32.92 longitude, using the WGS84 ellipsoid. It is also important to note that data can always be exported in different coordinate reference systems, such as WGS84 or others.

**Download an install**:

The Equi Processing plugin can be downloaded from the QGIS Plugin Repository here .

It can be installed either through the QGIS Plugin Manager or by downloading the plugin manually and installing it using the QGIS Plugin Installer.

It's important to note that the minimum version of QGIS required to run the plugin is 3.16.

"If you have any remark, don't hesitate to email me at: [email protected]. We thank you for your interest."

References:

- Franz Aurenhammer, Rolf Klein, Der-Tsai Lee: Voronoi Diagrams and Delaunay Triangulation. World Scientific, 2013

- Ivan Kutskir: Voronoi Diagram in JavaScript, 2009, accessed July 2020

- Methods of Maritime Outer Limits DelimitationChristos Kastrisios, Lt. H.N. MPS/GIS

- A manual on Technical Aspects of the united nations convention on the Law Of the Sea - 1982

Links:

https://github.com/qgis/QGIS/blob/master/python/plugins/processing/algs/qgis/VoronoiPolygons.py

https://docs.qgis.org/3.22/en/docs/developers_guide/index.html

https://github.com/gorhill/Javascript-Voronoi