bcGenRNDSurveyData³: Random data surveys    
V1.0 - 1 June 2019

Just for fun! This QGIS Processing algorithm creates dummy surveys with line, tie-lines and noisy data.
Lines and tie lines are not straight lines: noise is added to the X- & Y-coords. Data is a periodic function with lots of noise and spikes.

Distributed under the GPL licence
 

This algorithm works only on QGIS version 3.x.

This algorithm is part of the Processing geoprocAlgos plugin. Once installed the geoprocAlgos plugin can be found in the 'Processing toolbox'.

 

Please report any bug/problem/wish on GitHub.

---

Contents

• Installation
• Parameters
• Results
• Change log

---

 

Installation

Be aware that this algorithm requires extra pyton modules (numpy).

numpy should be installed with your QGIS installation. If not, it can be "pip install" from the QGIS command line (pip install numpy).

Minimum modules version required to run this algorithm:

• numpy: >= V1.16.3

See here for installation instruction.

Once successfully installed the algorithm is found in the Processing toolbox under GeoProc -> survey -> Random Survey Data

Double-click "Random Survey Data" to launch the configuration window.

 

Parameters

A survey is made of parallel lines and perpendicular tie-lines. Ratio line over tie-line is set at 10. Lines are made of a number of data points. Lines can have any direction.

Noise is introduced in each point coordinates, but consecutive points cannot cross each other, they increase along the line in one direction only. The orientation of every second line is inverted. Data is made of a damped periodic signal on which noise and spikes are added.

The following parameters are used to create your dummy survey:

• Number of lines. Default to 50.
• Number of data points. Default is 200 per line.
• Survey extent. The Lower-Left (Xmin, Ymin) - Upper-Right (Xmax, Ymax) coordinates of the survey bounding box, when lines are horizontal. The survey must have a projected coordinate system (crs). Lat/Lon coordinate systems are not tested.
• Line direction. Default 0°. The survey is rotated after being created with line at a 0° angle (horizontal).
• Data minimum value. Default 28 000. Spikes will go below that value.
• Data maximum value. Default 30 000. Spikes will go over that value.
• The coordinate system (CRS) used to create the layer. Default to the current canvas CRS.
• The output layer. Default to a memory layer.

 

Results

A new layer is created by default in QGIS Layers pane. This is a point vector layer that can be used as you wish. It has 5 fields: "X", "Y", "FID", "Line" and "Data".

Display of randomly generated survey location.
Click to zoom

Display of randomly generated data for the above survey.

 

Change log

• V1.0: Original public release.

 

Published date: 01 Jun 2019.