Changes between Version 1 and Version 2 of DataFormat/LidarDelivery


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Timestamp:
Feb 24, 2012 10:35:32 AM (7 years ago)
Author:
mark1
Comment:

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  • DataFormat/LidarDelivery

    v1 v2  
    2222The format of the delivered Digital Elevation Model (DEM) is band Sequential (BSQ) ENVI format binary data. The projection is in WGS-84 latitude and longitude, with heights relative to the WGS-84 spheroid. There is an accompanying ASCII text header file containing the required information to read the binary data. In most cases, the LiDAR data will have been 'patched' with ASTER data. This will extend the coverage of the DEM which is often required for processing the hyperspectral data.
    2323
     24=== ASCII LiDAR Point Clouds === #ASCIILIDARFILES
     25
     26The processed LiDAR data are delivered in multiple formats. One such format is as an ASCII list. These point cloud files contain a space separated summary of the data for each point, with each point being described on a separate line of the file. The ordering of the point data is described [wiki:FAQ/lidarasciiformat here]. The files can be opened and viewed in any simple text reader but because of their large size this may not be appropriate. It is possible to import these data in to GIS systems such as GRASS or ENVI.
     27
     28=== LAS LiDAR Point Clouds ===
     29
     30The processed LiDAR data are delivered in multiple formats. One such format is as LAS files. These are currently delivered by ARSF-DAN in two possible formats depending on whether full waveform data has been collected or not. The LAS files are binary data files that have a series of headers and then a collection of data points. They are the standard data type for storing LiDAR data. They can be read by most GIS systems that process LiDAR data, or using the various free software libraries such as [libLAS], [LASlib] and [LASTools].
     31
     32==== LAS v1.0 ====#LAS1.0FILES
     33
     34These LAS files are delivered by standard and do not have the capacity for storing waveform data. Detailed information about LAS 1.0 can be found in this document: [http://www.asprs.org/a/society/committees/standards/asprs_las_format_v10.pdf]
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     36
     37==== LAS v1.3 ====#LAS1.3FILES
     38
     39These LAS files are delivered only if full waveform data has been collected. Detailed information about LAS 1.3 can be found in this document: [http://www.asprs.org/a/society/committees/standards/LAS_1_3_r11.pdf]
    2440
    2541=== Screenshot images === #JPGFILES