Plugin to generate a three light exposure hillshade (shaded relief by combining three light exposures)
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README.md

Batch Hillshader

QGIS minimum version = 2.8

QGIS maximum version = 3.99

Author = PANOimagen S.L.

e-mail = info@panoimagen.com

Plugin to generate a three light exposure hillshade (shaded relief by combining three light exposures)

This plugin generates a three light exposure hillshade (shaded relief by combining three light exposures) using as input LiDAR classified data (ASPRS classification / *.laz, *.las formats) or a Digital Terrain Model (DTM) in raster format (GEOTiff / ASCII). The output file (three light exposure hillshade) is generated in GEOTiff format and users can save the intermediate processing results. This plugin allows users to process more than one file in the same process.

From version 2.3.0 user can generates a terrain hillshade and a surfaces hillshade (only with LasPy processing mode). The surfaces hillshade is generated using only the first LiDAR returns.

The three light exposures combining method is based in Gantenbein (2012).

Ref.: Gantenbein, C. (2012): "Creating Shaded Relief for Geologic Mapping using Multiple Light Sources". U.S. From "Digital Mapping Techniques'10--Workshop Proceedings". Geological Survey Open-File Report 1171

(https://pubs.usgs.gov/of/2012/1171/pdf/usgs_of2012-1171-Gantenbein_p101-106.pdf) (Consult date-time: 2017/10/24 - 18:25 p.m.)

The following image shows the results of a terrain hillshade (left) and a surfaces hillshade (right). Results generated with LasPy Library image

For processing LiDAR data (allways in ASPRS format *.laz, and *.las) you must to install some external dependecies:

You can use LasPy Library (BSD License) to generate a three exposure hillshade from *.las ASPRS format:

To install LasPy Library, you must launch the following line at OSGEO Shell:

    > python -m pip install laspy

LasPy documentation is avaible at: https://github.com/laspy/laspy

If the process option with the LasPy library is not activated once it has been installed, you must restart QGIS.

If you need to process compressed LiDAR data (*.laz format) and you want to use Free Open Source Software you can unzip laz format to las format using LasZip Library: LasZip is LGPL License and you can found it at: https://www.laszip.org/

If you uses as input LiDAR data, note that plugin uses LASTools library. See LASTools License at: https://rapidlasso.com/lastools/

At the process with LiDAR data, user can generates the FUSION LDV Catalog report with the ground points, to check the input data quality (returns density, number of returns, return intensity, ...).

KeyWords = Shaded Relief, Hillshade, Digital Terrain Model, DTM, LiDAR, Batch Hillshade Processing, Three Exposure Hillshade, Digital Surfaces Model, MDS, Digital Elevation Model, MDE

Batch Hillshader license:

Copyright (C) 2017  by PANOimagen S.L.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

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