Scripts and Modules of Package opalsPreprocess
Python Scripts | Description |
opalsPreprocess.py | Package script providing tools for preprocessing of ALS data. |
preAttribute.py | Computes a set attributes for a list of point cloud files. |
preCalcFootprint.py | Calculates the axes of the laser footprint on the target using a trigonometric approach. |
preCutting.py | Cuts an ODM/Raster file using one or more polygons of a shape file. |
preDataCheck.py | Performs a point cloud data check to secure validity and plausibility of input files. |
preOutlierDetection.py | Detects and classifies outliers within a point cloud. |
preTiling.py | Tesselates a (flight) block into tiles of equal size. |
Modules | Description |
AddInfo | Inserts or updates ODM attributes by combining existing attributes and/or grid models. |
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. |
Colorize | |
DirectGeoref | Transforms points from scanner coordinates into geo-referenced coordinates by applying the sensor model (flight trajectory, mounting parameters). |
EchoRatio | Derives and stores the echo ratio (ER) attribute for points of an OPALS data manager. |
Export | Exports vector data stored in an OPALS data manager (ODM) in various data formats. |
Fullwave | Performs decomposition of the full waveform signal and provides 3D coordinates (scanner system) and additional attributes for each return. |
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). |
Normals | Estimates local surface normal vectors for each point of a specific point cloud (ODM). |
PointStats | Derives and stores statistical parameters describing the local distribution of a point attribute for each point of an ODM. |
RadioCal | Performs radiometric calibration of ALS data and calculates physical quantities (backscatter cross section/coefficient, reflectance) for each return. |
Rasterize | Performs vector-to-raster conversion for all types of simple feature geometries (points, lines, polygons). |
Segmentation | Provides methods for point cloud segmentation based on local homogeneity using either a generic region growing approach or an adapted region growing for plane extraction. |
TIN | Creates a TIN surface from ODM vector data based on a 2D constrained Delaunay triangulation. |
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. |