Introduction

LiMapper is an aerial photogrammetry software which can reconstruct 3D geometry structure from overlapping images and subsequently generate a series of standard products of surveying and mapping. The key advantages of the software include automated process, high efficiency, robust performance, and professional accuracy. All this stems from the state-of-the-art photogrammetry and computer vision algorithms implemented in LiMapper, which are accelerated by fully exploiting hardware resources such as multi-core CPU and high-performance GPU. Based on data-processing experience, the algorithms are further optimized to handle not only traditional aerial images of large frames, but also UAV-images with unstable orientations and unknown lens distortions. Considering user friendliness the well-designed software interface is kept simple and easy to use for both novice and expert users.

LiMapper has the scalability to process more than 10000 photos in a project. Supported source data types are nadir, oblique, and multispectral photos. The core functions/modules of the software include feature point extraction/matching, bundle block adjustment, camera self-calibration, dense reconstruction, DEM/DSM generation, smart ortho-mosaicking, true orthophoto generation, stitching line editing, data visualization and analysis.

Features

Features and Advantages
Inputs Aerial Images
  • Process photos of multi-camera, multi-flight, multiple platforms with various flight heights
  • Support data types of nadir, oblique, multispectral photos
  • Support image formats JPG, TIFF, BMP
Camera Intrinsics
  • Import LiMapper Params(XML), PhotoScan Params(XML), Australis Params(TXT)
  • Extract lens infos from image EXIF automatically
  • Group photos and edit parameters flexibly
Positions and Orientations
  • Extract positions from image EXIF automatically
  • Import and parse external file with the formats TXT, CSV
  • Support local coordinate system, geographic coordinate system, and projection coordinate system
Control Point/Check Point/Tie Point
  • Use ground control points to increase the accuracy of photos alignment
  • Use check points to evaluate the absolute accuracy
  • Use manual tie points to register photos of featureless area
Workflow One-Stop Process
  • Highly automated workflow
  • User-friendly interface for beginners
Align Photos
  • Automated images matching and bundle block adjustment without preconditions about camera intrinsics, positions and orientations
  • Integrated camera self-calibration
  • Editable measurement weights in bundle block adjustment
  • Robust performance for hard dataset such as forestry photos
Build Dense Cloud
  • Reconstruct object details through pixel-wise image matching
  • Generate 2.5D or 3D dense cloud
Build DEM/DSM
  • Extract ground points automatically to generate DEM which meets the requirements of surveying and mapping
  • Generate DSM that keeps object details
  • Import/convert external DEM/DSM
Build Orthomosaic
  • Generate true orthophoto based on DSM, and fill occlusion area using photos taken from other view directions
  • Generate smart stitching lines that elude significant objects, in order to mitigate distortions at edges
  • Blend images for better visual effect
Acceleration
  • Exploit multi-core CPU and high-performance GPU to accelerate processing
Orthomosaic Edit Adjust Stitching Line
  • Edit polygonal area and assign visible orthophotos
  • Update stitching line and orthomosaic in real time
Data Visualization & Analysis 2D
  • Quick view of input photos, corresponding feature points and control points
  • Display huge orthomosaic utilizing adaptive LOD
  • Provide tools to measure position, length, and area of object
2.5D
  • Display huge DEM/DSM with hillshade effect utilizing adaptive LOD
  • Provide tools to measure position, length, area, and height of object
3D
  • Update tie points and camera positions in real time while aligning photos
  • Disply massive dense point cloud utilizing adaptive LOD
  • Use EDL to enhance the rendering of depth discontinuity
Tools Haze Removal
  • Enhance images in pre-processing step
Image Undistortion
  • Undistort images using calibration parameters
Products Export Interior & Exterior Orientations
  • Export interior & exterior orientations after photos alignment
Export Point Cloud
  • Export sparse tie points and dense point cloud as PLY, OBJ, LAS
Export DEM/DSM
  • Export DEM/DSM as TIFF, KML
Export Orthomosaic
  • Export Orthomosaic as TIFF, KML
Export Stitching Line
  • Export stitching line as Shape file

Get Started

Please refer to Installation and License to get the software. The usage is described in Tutorials and Workflow.

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