Changes between Initial Version and Version 1 of las_support

Timestamp:

06/06/11 15:54:16 (14 years ago)

Author:

dburken

Comment:

--

las_support

@@ +1 @@
+
+== LAS LIDAR Support ==
+
+Two plugins available with LAS readers:
+
+liblas plugin:
+[http://trac.osgeo.org/ossim/browser/trunk/ossim_plugins/liblas]
+
+Generic las plugin:
+[http://trac.osgeo.org/ossim/browser/trunk/ossim_plugins/las]
+
+The liblas plugin has a dependency on libLAS.
+[http://liblas.org/]
+
+The las plugin has no dependencies other than ossim.  Currently only coded for point type one.
+
+The is a generic LAS header dump in ossim core so you can do ossim-info -d without any plugin.
+
+With either plugin you can do:
+
+{{{
+$ ossim-info -d -i -p 000330.las 
+las.file_source_id: 0
+las.gps_time_type: 0
+las.waveform_data_packets_internal: 0
+las.waveform_data_packets_external: 0
+las.synthetically_generated: 0
+las.project_id_guid: 1dee478d-fa50-49c8-a9c54fde367ace40
+las.version: 1.2
+las.system_indentifier: NIIRS10
+las.generating_software: LIDAR1 tiled
+las.file_creation_day: 250
+las.file_creation_year: 2010
+las.header_size: 227
+las.offset_to_point_data: 1966
+las.number_of_variable_length_records: 5
+las.point_data_format_id: 1
+las.point_data_record_length: 28
+las.number_of_point_records: 2915929
+las.number_of_points_return1: 2596564
+las.number_of_points_return2: 269269
+las.number_of_points_return3: 47603
+las.number_of_points_return4: 2493
+las.number_of_points_return5: 0
+las.x_scale_factor: 0.0100
+las.y_scale_factor: 0.0100
+las.z_scale_factor: 0.0100
+las.x_offset: 0.0000
+las.y_offset: 0.0000
+las.z_offset: 0.0000
+las.max_x: 13005001.3200
+las.min_x: 13000001.3300
+las.max_y: 335000.1200
+las.min_y: 330000.1200
+las.max_z: 1580.3900
+las.min_z: 926.7200
+image0.decimal_degrees_per_pixel_lat:  9.00281717218119e-06
+image0.decimal_degrees_per_pixel_lon:  1.2150363478007e-05
+image0.decimations:  (1,1) (0.5,0.5) (0.25,0.25) (0.125,0.125) (0.0625,0.0625) (0.03125,0.03125) (0.015625,0.015625) (0.0078125,0.0078125)
+image0.gsd:  (1.00005919045009,1.00005919171835)
+image0.image_size:  (1524,1524)
+image0.ll_lat:  42.4046185000387
+image0.ll_lon:  -84.8235731136942
+image0.lr_lat:  42.4046914040585
+image0.lr_lon:  -84.8050721763752
+image0.meters_per_pixel_x:  1.00005919045009
+image0.meters_per_pixel_y:  1.00005919171835
+image0.projection.central_meridian:  -84.3666666666667
+image0.projection.datum:  NAR
+image0.projection.elevation_lookup_flag:  0
+image0.projection.ellipse_code:  RF
+image0.projection.ellipse_epsg_code:  7019
+image0.projection.ellipse_name:  GRS 80
+image0.projection.false_easting_northing:  (4000012.32,0)
+image0.projection.false_easting_northing_units:  feet
+image0.projection.gcs_code:  4152
+image0.projection.major_axis:  6378137
+image0.projection.minor_axis:  6356752.3141
+image0.projection.origin_latitude:  41.5
+image0.projection.pcs_code:  2898
+image0.projection.pixel_scale_units:  meters
+image0.projection.pixel_scale_xy:  (1,1)
+image0.projection.srs_name:  EPSG:2898
+image0.projection.std_parallel_1:  42.1
+image0.projection.std_parallel_2:  43.6667
+image0.projection.tie_point_units:  meters
+image0.projection.tie_point_xy:  (3962400.405384,102108.036576)
+image0.projection.type:  ossimLambertConformalConicProjection
+image0.target_rrds:  0
+image0.tie_point_lat:  42.418329790592
+image0.tie_point_lon:  -84.8236735393142
+image0.type:  ossimImageGeometry
+image0.ul_lat:  42.418329790592
+image0.ul_lon:  -84.8236735393142
+image0.ur_lat:  42.4184027106036
+image0.ur_lon:  -84.8051685357372
+}}}
+
+To convert a LAS file to a geotiff:
+
+{{{
+ossim-icp tiff_tiled_band_separate 000335.las outputs/t1.tif
+}}}
+
+To convert a LAS file to a geotiff setting the scale (grid size) to 2.5 meters:
+
+{{{
+ossim-icp --reader-prop scale=2.5 tiff_tiled_band_separate 000335.las outputs/t1.tif
+}}}
+
+
+