SecQuery

Render geodesic buffers and query point data in sectors

Author      

Srividya Subramanian

Software Developer, CERN

Meyrin, Switzerland

About the Plugin

This QGIS plugin takes in a Point Layer as input along with a specified radius and center point. It then renders geodesic buffers with a given number of sectors. The point data in those sectors can be queried using a custom map tool. Geodesic buffers are rendered with the geographiclib library. The concept behind rendering the buffers was reffered from the Shape Tools plugin. The smoothness of the buffers can also be configured. The queried point data is added as a new memory layer, so that users have access to all the attributes selected sector area.

Geodesic Buffers

Account for the earth's actual shape (an elipsoid or geoid) in the calculation of the buffer.

Variable Sectors

Specify required number of sectors between 4 and 32; Render geodesic radii to demarcate sectors.

Multiple Radius Units

Enter radius in centimeters, meters, kilometers, inches, feet, miles, nautical miles or yards.

Map Select Center

Select the buffer center from a map click (via a map tool) or enter the desired coordinates.

Queried Data Output Layer

Get data queried from a sector as separate memory layer with all attributes from input layer.

Direction Labels

Get labels for the 16 directions around the buffer; The directions are added as a new memory layer.

Read the documentation for usage guidance

Documentation

Changelog

v1.0.0

24/08/2022
  • First release of SecQuery Plugin.
  • Geodesic buffers and radii.
  • Specify radius in multiple units.
  • Variable number of sectors.