Package opalsQuality
The package opalsQuality contains various modules for checking the quality of ALS point clouds. The aim of this package is to get a simple and fast overview about the captured terrain data and their quality. Among the features of interest are: digital surface models (DSM), point density maps, ALS strip differences for checking the relative accuracy, differences to control-patches in order to check the absolute accuracy and similar. The final goal is to provide a professional basis for the checking and documentation of the quality of ALS data and for decision making on further pre-processing like strip adjustment.
| Python Scripts | Description |
|---|---|
| opalsQuality.py | proxy class for packages.python.opalsQuality |
| qltDSM.py | proxy class for packages.python.qltDSM |
| qltDensity.py | proxy class for packages.python.qltDensity |
| qltLSM.py | proxy class for packages.python.qltLSM |
| qltStripDiff.py | proxy class for packages.python.qltStripDiff |
| Modules | Description |
| Algebra | Provides a generic raster algebra calculator featuring mathematical, statistical and conditional operators. |
| Bounds | Derives and stores the 2D boundary polygon of a region covered by the point data of an ODM or the valid pixels of a raster. |
| Cell | Calculates statistical features of user defined attributes and stores them as raster models or rasterized point clouds. |
| Colorize | |
| Diff | Calculates a difference grid model based on either two grids or a one grid and a horizontal reference plane. |
| Export | Exports vector data stored in an OPALS data manager (ODM) in various data formats. |
| Grid | Derives a 2.5D digital elevation models (DEM) in regular grid structure using simple interpolation techniques. |
| Histo | Derives histograms and descriptive statistics (min, max, mean, r.m.s, etc.) for ODM or grid/raster data sets and stores the results graphically (SVG) and numerically (XML). |
| Import | Loads vector and raster data into an ODM for subsequent use in modules dealing with point cloud and line related data. |
| Info | Extracts and reports header information of a vector or raster file (ODM, GDAL). |
| LSM | Estimates an affine 3D transformation to align overlapping ALS strip DEMs using Least Squares Matching. |
| Overlap | Analyses a set of strip boundaries and determines all overlapping strip pairs. |
| Rasterize | Performs vector-to-raster conversion for all types of simple feature geometries (points, lines, polygons). |
| Shade | Derives shaded relief raster maps (geo-coded hill shading) of DEM grids. |
| Translate | Performs format conversion for vector data files with additional read support of GDAL rasters. |
| Vectorize | Performs raster-to-vector conversion and exports polyline geometries. |
| View | Provides an interactive 3d viewer for points (including arbitrary attributes) and lines. |
| ZColor | Derives color coded visualizations of grid models and stores them as geo-coded raster images. |
