Version 1 (modified by 14 years ago) ( diff ) | ,
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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
Note:
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