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Lidar Tools for ENVI

已有 9825 次阅读 2011-3-31 09:24 |个人分类:ENVI|系统分类:科研笔记| ENVI


Lidar Tools for ENVI

 ENVI4.8包含了一个简易版的Lidar Tools,这个Bcal Lidar Tools扩展补丁的处理功能更加丰富。

 

 

模块功能列表

LAS File Utilities

Process/Manipulate LAS files

- Get LAS Header Info

Displays header and projection information for an LAS file

- Get LAS Data Info

Displays descriptive data statistics for LAS file(s)

- Add Projection to LAS File(s)

Adds embedded projection information to LAS files

- Reproject LAS File(s)

Converts existing LAS files into a new map projection

- Convert Ascii Data to LAS

Converts text point data into LAS format lidar files

- Convert LAS Data to Ascii/Shapefile

Converts LAS format lidar files into delimited text or ESRI Shapefile point data

- Create Boundary EVF/SHP/KML

Creates an vector file (EVF, shape or KML) that shows the boundaries of the data

- Buffer LAS Files

Geographically buffers the data using neighboring files

- Tile LAS File(s)

Divides one or more files into multiple tiles

- Decimate LAS File(s)

Decimates the points the data file

- Subset LAS File(s)

Subset LAS files by coordinates or image/ROI

- - Subset via Coordinates

Subsets data files according to user coordinates

- - Subset via Image/ROI

Subsets data files using a reference image and/or regions of interest

- Export LAS File(s)

Export LiDAR returns by return number, number of returns, classes, elevation, intensity, and scan angle

- Assign RGB Channel Data

Assigns RGB channel data from multi-band images, elevation color, or vegetation height color, to LAS 1.2 files

- Extract Flight Lines

Extract flight lines from LAS file(s) using GPS time information

Perform Height Filtering

Performs vegetation filtering on the data

Create Bare-earth DEM

Creates bare-earth digital terrain model from height-filtered LAS file(s)

Create Raster Products

Create various topographic, intensity and vegetation raster products

- Create Topographic Products (Bare-earth)

Creates various raster topographic bare-earth products

- Create Topographic Products (All returns)

Creates various raster topographic products from all point data

- Create Vegetation Products

Creates various raster vegetation products

- Create Intensity Products

Creates various raster intensity products

- Prepare LAS file(s)

Add vegetation height information to the LAS file(s) from existing bare-earth digital terrain model

Rasterize Lidar Data (Legacy)

Converts raw point data into various raster products

Create Vegetation Height Groups

Separate input LAS file into user-specified vegetation height groups

Create Elevation Profile(s)

Creates one or more elevation profiles along a user-defined transect

3D Lidar Viewer

An interactive viewer for displaying lidar point data

LidarTools 处理流程

This page is a basic guideline to processing LiDAR data using the BCAL LiDAR Tools software package for ENVI. More detailed information on the individual steps can be found on the information pages for the respective tools.

Step 1: Convert your data to the .las format (if necessary)

The BCAL LiDAR Tools package requires that all data be in the .las data format. If your data are not in this format, you will need to convert them before any processing can take place. The BCAL LiDAR Tools package contains a conversion tool for converting your data from ascii to las.

Step 2: Tile your data (if necessary)

In order to accomplish many of the functions in the BCAL LiDAR Tools package, the software must be able to read the individual files into the computer's memory. If the files are too large (or if the computer's memory is limited), they can be broken into smaller files using the tiling feature. Alternatively, large files may also be subset or decimated.

Step 3: Explore your data

Use the file info tool to explore your data files. Things to look for include projection information (or lack thereof), point density, number of returns available, and the spatial extents of the data. Also of use is the boundary tool, with which you can display the geographic footprints of the individual files.

Step 4: Buffer your data (optional)

When filtering and/or rasterizing multiple files at once (for a single project), the software often has problems at the seams between the data tiles. These problems can be overcome by buffering the data, which creates areas of overlap between the files. The buffer distance (and thus distance of overlap) should be several times the value of the canopy spacing (filtering) or pixel size (rasterizing).

Step 5: Filter your data

If you are interested in calculating the heights of vegetation in your data or determining bare ground elevations, use the height filtering tool.

Step 6: Rasterize your data

Use the raster tool to create various raster products from your data. Remember that the raster products related to vegetation and/or bare ground cannot be created unless the data have been filtered first.

流程图

 

下载链接:http://bcal-lidar-tools.googlecode.com/files/LiDARTools-1.2.0.zip

安装方法:

将压缩包内的sav文件copyENVIsave_add目录下,重启ENVI即可。



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