[Liblas-commits] laszip: moving detail from and data to main page
liblas-commits at liblas.org
liblas-commits at liblas.org
Tue Mar 22 14:59:58 EDT 2011
details: http://hg.liblas.orglaszip/rev/420caf9924a9
changeset: 195:420caf9924a9
user: isenburg
date: Tue Mar 22 12:12:09 2011 -0700
description:
moving detail from and data to main page
diffstat:
docs/source/data.rst | 6 ++++--
docs/source/detail.rst | 16 ++++++++++++++++
docs/source/index.rst | 46 ++++++++++++++++------------------------------
3 files changed, 36 insertions(+), 32 deletions(-)
diffs (132 lines):
diff -r a255003d4ca7 -r 420caf9924a9 docs/source/data.rst
--- a/docs/source/data.rst Tue Mar 22 11:22:22 2011 -0700
+++ b/docs/source/data.rst Tue Mar 22 12:12:09 2011 -0700
@@ -1,11 +1,13 @@
.. _data:
-******************************************************************************
+
download LAZ data (compressed LAS files)
-******************************************************************************
+------------------------------------------------------------------------------
* http://gisfiles.wm.edu/files/lidar/ESLiDAR/LiDAR_ClassifiedPointCloud/
* ftp://lidar.dnr.state.mn.us/data/raw/county/dodge/laz/
+* ftp://lidar.dnr.state.mn.us/data/raw/county/faribault/laz/
+* ftp://lidar.dnr.state.mn.us/data/raw/county/fillmore/laz
* ftp://lidar.dnr.state.mn.us/data/raw/county/waseca/laz/
* http://liblas.org/samples/
diff -r a255003d4ca7 -r 420caf9924a9 docs/source/detail.rst
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/source/detail.rst Tue Mar 22 12:12:09 2011 -0700
@@ -0,0 +1,16 @@
+ For example, the ``x`` and ``y``
+coordinate of a point are predicted by adding their delta in the preceding two
+points to the ``x`` and ``y`` of the last point, whereas the difference
+between subsequent points' time values is expressed as a multiple of the most
+common increment, while RGB valued are compressed with simple difference
+coding. In each case the prediction residuals are compressed with adaptive
+arithmetic coding.
+
+The compressor treats the LAS points of types 0, 1, 2, 3, 4, 5, and 6 as
+consisting of a number of items: POINT10, GPSTIME11, RGB12, and WAVEPACKET13
+and uses separate modules with separate version numbers to compress each item.
+This makes it easy to improve, for example, the compressor for the
+``gps_time`` without affecting the other compression schemes while
+guaranteeing full backwards compatibility. More importantly it allows the
+engine to add new LAS point types as the LAS specification evolves into the
+future without affecting existing point types.
diff -r a255003d4ca7 -r 420caf9924a9 docs/source/index.rst
--- a/docs/source/index.rst Tue Mar 22 11:22:22 2011 -0700
+++ b/docs/source/index.rst Tue Mar 22 12:12:09 2011 -0700
@@ -1,14 +1,9 @@
.. _home:
-******************************************************************************
-LASzip
-******************************************************************************
-
-Download
+LASzip Download
------------------------------------------------------------------------------
-
Source
..............................................................................
@@ -27,9 +22,9 @@
include files to compile LASzip into your own application. `libLAS`_
binaries through `OSGeo4W`_ also link LASzip.
- - A simple Windows binary, `laszip.exe`_, is also available for
- explicit compression and decompression tasks to and from `ASPRS LAS format`_.
-
+ - A Windows binary `laszip.exe`_ and a simple makefile to build `laszip`_ are
+ available for explicit compression (decompression) of LAS (LAZ) files.
+
Development Source
------------------------------------------------------------------------------
@@ -59,22 +54,7 @@
LASzip compression can be many times smaller and many times faster than
`bz2`_, `gzip`_, and `rar`_ because it takes advantage of knowing what the
-different bytes in a LAS file represent. For example, the ``x`` and ``y``
-coordinate of a point are predicted by adding their delta in the preceding two
-points to the ``x`` and ``y`` of the last point, whereas the difference
-between subsequent points' time values is expressed as a multiple of the most
-common increment, while RGB valued are compressed with simple difference
-coding. In each case the prediction residuals are compressed with adaptive
-arithmetic coding.
-
-The compressor treats the LAS points of types 0, 1, 2, 3, 4, 5, and 6 as
-consisting of a number of items: POINT10, GPSTIME11, RGB12, and WAVEPACKET13
-and uses separate modules with separate version numbers to compress each item.
-This makes it easy to improve, for example, the compressor for the
-``gps_time`` without affecting the other compression schemes while
-guaranteeing full backwards compatibility. More importantly it allows the
-engine to add new LAS point types as the LAS specification evolves into the
-future without affecting existing point types.
+different bytes in a LAS file represent.
Another advantage of LASzip over generic compressors is that it allows you to
treat the compressed LAZ files just like standard LAS files and load them
@@ -85,14 +65,18 @@
.. note::
`libLAS`_ externally links to released forms of the library at
- http://laszip.org while `LASlib`_ currently embeds this same
- compression/decompression codebase.
+ http://laszip.org while `LASlib`_ embeds the LASzip codebase.
-Data
+
+Download LAZ data
------------------------------------------------------------------------------
-LASzip-compressed data is available from :ref:`here <data>`.
-
+* http://gisfiles.wm.edu/files/lidar/ESLiDAR/LiDAR_ClassifiedPointCloud/
+* ftp://lidar.dnr.state.mn.us/data/raw/county/dodge/laz/
+* ftp://lidar.dnr.state.mn.us/data/raw/county/faribault/laz/
+* ftp://lidar.dnr.state.mn.us/data/raw/county/fillmore/laz
+* ftp://lidar.dnr.state.mn.us/data/raw/county/waseca/laz/
+* http://liblas.org/samples/
.. toctree::
:hidden:
@@ -102,6 +86,7 @@
.. _`OSGeo4W`: http://trac.osgeo.org/osgeo4w
.. _`Martin Isenburg`: http://www.cs.unc.edu/~isenburg
.. _`ASPRS LAS format`: http://www.asprs.org/society/committees/standards/lidar_exchange_format.html
+.. _`LAS`: http://www.asprs.org/society/committees/standards/lidar_exchange_format.html
.. _`LGPL`: http://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License
.. _`bz2`: http://en.wikipedia.org/wiki/Bzip2
.. _`gzip`: http://en.wikipedia.org/wiki/Gzip
@@ -111,3 +96,4 @@
.. _`lasLIB`: http://www.cs.unc.edu/~isenburg/lastools/download/laslib_README.txt
.. _`lasLIB source`: http://www.cs.unc.edu/~isenburg/lastools/download/laslib.zip
.. _`laszip.exe`: http://www.cs.unc.edu/~isenburg/lastools/
+.. _`laszip`: http://www.cs.unc.edu/~isenburg/lastools/download/laslib.zip
More information about the Liblas-commits
mailing list