The OpenTopography Tool Registry provides a community populated clearinghouse of software, utilities, and tools oriented towards high-resolution topography data (e.g. collected with lidar technology) handling, processing, and analysis. Tools registered below range from source code to full-featured software applications. We welcome contributions to the registry via the Contribute a Tool page.

	Tool Name	Date	Tool Type	Rating
1	CHaMP Transformation Tool	4 Sep 2014	Data Management / Handling
Keywords: transformation, georeferencing point cloud License: GNU General Public License Description: The Ecogemorphology & Topographic Analysis Lab (ET-AL) and the RSGIS Laboratory developed this ArcGIS Add-in for the transformation and projection of CHaMP field survey data (Bouwes et al. 2011) into real world coordinates given hand-held GPS coordinates from just three benchmarks. The CTT will work with any unprojected data in a file geodatabase, and gives you multiple ways to do an afine transformation based on a simple shift and rotation. Although other transformation tools exist in ArcGIS, there is not a simple sequence of geoprocessing tools, which allow you to transform vector data in a manner that preserves the high relative accuracy of a total station survey. See Wheaton et al. (2012) and the ReadMe page for more background.
2	Geomorphic Change Detection Software	4 Sep 2014	DEM Analysis
Keywords: DEM error modelling, change detection, DEM uncertainty, geomorphic interpretation License: Other Description: The GCD software was developed primarily for morphological sediment budgeting in rivers. The volumetric change in storage is calculated from the difference in surface elevations from digital elevation models (DEMs) derived from repeat topographic surveys. As each DEM has an uncertain surface representation (which might vary in space and time), our ability to detect changes between surveys is highly dependent on surface representation uncertainties inherent in the individual DEMs. The fundamental problem is separating out the changes between the surveys that are due to geomorphic change as opposed to noise in the survey data. GCD provides a suite of tools for quantifying those uncertainties independently in each DEM and propagating them through to the DEM of difference. The program also provides ways for segregating the best estimates of change spatially using different types of masks. The overall suite of tools is more generically applicable to many different spatial raster-based change detection problems.
3	ToPCAT = Topographic Analysis Toolkit	4 Sep 2014	Point Cloud Analysis
Keywords: TLS, SFM, point cloud statistics, point cloud decimation License: GNU General Public License Description: Topographic Point Cloud Analysis Toolkit (ToPCAT) is a software package developed by Brasington et al. (2012) used to decimate (or thin) a point cloud and calculate meaningful statistics for grid defined areas. The process of decimation can reduce computation time and produce meaningful summary outputs (e.g. zMin for modeling bare earth elevations; and detrended standard deviation for modelling surface roughness).
4	scarplet	3 Dec 2018	DEM Analysis
Keywords: Python, fault scarp, edge detection, image processing, diffusion dating License: MIT license / X11 license Description: scarplet is a Python package for detecting and relatively dating landforms like fault scarps in DEMs. It implements curvature based landform templates that can be used to estimate the maturity of a feature by diffusion dating or detect distinctive topographic features.
5	CHaMP Topo Processing Toolbar	4 Sep 2014	DEM generation
Keywords: total station surveys, topographic License: GNU General Public License Description: The CHaMP Topo Processing Toolbar exists to take raw data from CHaMP ground-based topographic surveys and run these through steps of 1) survey data evaluation, 2) generating topographic surfaces, 3) DEM derived products and metrics (including, detrending, derivation of cross sections, profiles, thalwegs, bankfull, etc.), 4) QA/QC. Although the overall workflow of the tool is focused on CHaMP topographic data, many of the individual commands and steps will be more generically useful to some.
6	SCIMAP	23 Jul 2018	DEM Analysis
Keywords: diffuse pollution, non-point source pollution, connectivity, critical source areas License: Other Description: SCIMAP is a diffuse / non-point pollution risk mapping tool design to identify where within a catchment the pollutants are most likely to be come from. The tool work for sediment, nutrients and microbial pollution and enables the effective targeting of mitigation measures. SCIMAP identifies the critical source areas for the pollutant by the joint consideration of the mobilisation and hydrological connectivity patterns across the landscape. The tool can use both LiDAR and drone derived detailed topographic data.
7	TopoToolbox	21 Jul 2015	Visualization, DEM Analysis
Keywords: MATLAB, tectonic geomorphology, DEM analysis License: BSD license Description: TopoToolbox is a suite of MATLAB functions for topographic analysis. The major aim of TopoToolbox is to offer helpful analytical GIS utilities in a non-GIS environment in order to support the simultaneous application of GIS-specific and other quantitative methods. Key methods include advanced methods of flow direction derivation, stream network extraction and manipulation, slope-area analysis, chiplots, and swath profiles.