SysTutorials Posts

NAME gdbm_load – re-create a GDBM database from a dump file. SYNOPSIS gdbm_load [-Mnr] [-b NUM] [-c NUM]  [-m MODE] [-u NAME|UID[:NAME|GID]]     [–block-size=NUM] [–cache-size=NUM] [–mmap=NUM]     [–mode=MODE] [–no-meta] [–replace]     [–user=NAME|UID[:NAME|GID]] FILE [DB_FILE]                          gdbm_load [-Vh] [–help] [–usage] [–version] DESCRIPTION Create a gdbm database file DB_FILE from the dump file FILE. If the FILE argument is not supplied, output the created database to the standard error….

NAME gdbm_dump – dump a GDBM database to a file SYNOPSIS gdbm_dump [-H FMT] [–format=FMT] DB_FILE [FILE] gdbm_dump [-Vh] [–help] [–usage] [–version] DESCRIPTION The gdbm_dump utility creates a dump of the specified gdbm(3) database file. The name for the output dump file is supplied by the second argument (FILE). If not specified, the output goes…

NAME gdb – The GNU Debugger SYNOPSIS gdb [OPTIONS] [prog|prog procID|prog core] DESCRIPTION The purpose of a debugger such as GDB is to allow you to see what is going on “inside” another program while it executes — or what another program was doing at the moment it crashed. GDB can do four main kinds…

NAME gdb-add-index – Add index files to speed up GDB SYNOPSIS gdb-add-index filename DESCRIPTION When GDB finds a symbol file, it scans the symbols in the file in order to construct an internal symbol table. This lets most GDB operations work quickly—at the cost of a delay early on. For large programs, this delay can…

NAME gdalwarp – gdalwarp image reprojection and warping utility SYNOPSIS gdalwarp[–help – general][–formats] [-s_srs srs_def][-t_srs srs_def][-to “NAME=VALUE”] [-order n | -tps | -rpc | -geoloc][-et err_threshold] [-refine_gcps tolerance[minimum_gcps]] [-te xmin ymin xmax ymax][-tr xres yres][-tap][-ts width height] [-wo “NAME=VALUE”][-ot Byte / Int16 / …][-wt Byte / Int16] [-srcnodata “value [value…]”][-dstnodata “value [value…]”] – dstalpha [-r…

NAME gdaltransform – gdaltransform transforms coordinates SYNOPSIS gdaltransform[–help – general] [-i][-s_srs srs_def][-t_srs srs_def][-to “NAME=VALUE”] [-order n][-tps][-rpc][-geoloc] [-gcp pixel line easting northing[elevation]] * [srcfile[dstfile]] DESCRIPTION The gdaltransform utility reprojects a list of coordinates into any supported projection,including GCP-based transformations. -s_srs srs def: source spatial reference set. The coordinate systems that can be passed are anything supported…

NAME gdaltindex – gdaltindex Builds a shapefile as a raster tileindex SYNOPSIS gdaltindex [-f format] [-tileindex field_name] [-write_absolute_path] [-skip_different_projection] [-t_srs target_srs] [-src_srs_name field_name] [-src_srs_format [AUTO|WKT|EPSG|PROJ] [-lyr_name name] index_file [gdal_file]* DESCRIPTION This program builds a shapefile with a record for each input raster file, an attribute containing the filename, and a polygon geometry outlining the raster….

NAME gdalsrsinfo – gdalsrsinfo lists info about a given SRS in number of formats (WKT, PROJ.4, etc.) SYNOPSIS Usage: gdalsrsinfo [options] srs_def srs_def may be the filename of a dataset supported by GDAL/OGR from which to extract SRS information OR any of the usual GDAL/OGR forms (complete WKT, PROJ.4, EPSG:n or a file containing the…

NAME gdalmove – gdalmove.py Transform georeferencing of raster file in place SYNOPSIS gdalmove.py[-s_srs<srs_defn>] – t_srs<srs_defn>[-et<max_pixel_err>] target_file DESCRIPTION The gdalmove.py script transforms the bounds of a raster file from one coordinate system to another, and then updates the coordinate system and geotransform of the file. This is done without altering pixel values at all. It is…

NAME gdalmanage – gdalmanage Identify, delete, rename and copy raster data files SYNOPSIS Usage : gdalmanage mode[-r][-u][-f format] datasetname[newdatasetname] DESCRIPTION The gdalmanage program can perform various operations on raster data files, depending on the chosen mode. This includes identifying raster data types and deleting, renaming or copying the files. mode: Mode of operation identify datasetname:…

NAME gdallocationinfo – gdallocationinfo raster query tool SYNOPSIS Usage : gdallocationinfo[–help – general][-xml][-lifonly][-valonly] [-b band] * [-overview overview_level] [-l_srs srs_def][-geoloc][-wgs84] srcfile[x y] DESCRIPTION The gdallocationinfo utility provide a mechanism to query information about a pixel given it’s location in one of a variety of coordinate systems. Several reporting options are provided. -xml: The output report…

NAME gdalinfo – gdalinfo lists information about a raster dataset SYNOPSIS gdalinfo[–help – general][-mm][-stats][-hist][-nogcp][-nomd] [-norat][-noct][-nofl][-checksum][-proj4] [-listmdd][-mdd domain |`all`] * [-sd subdataset] datasetname DESCRIPTION The gdalinfo program lists various information about a GDAL supported raster dataset. -mm Force computation of the actual min/max values for each band in the dataset. -stats Read and display image statistics….

NAME gdaldem – gdaldem Tools to analyze and visualize DEMs. (since GDAL 1.7.0) SYNOPSIS – To generate a shaded relief map from any GDAL – supported elevation raster: gdaldem hillshade input_dem output_hillshade [-z ZFactor(default = 1)][-s scale * (default = 1)] ” [-az Azimuth(default = 315)][-alt Altitude(default = 45)] [-alg ZevenbergenThorne][-combined] [-compute_edges][-b Band(default = 1)][-of…

NAME gdalcompare – gdalcompare.py compare two images SYNOPSIS gdalcompare.py [-sds] golden_file new_file DESCRIPTION The gdalcompare.py script compares two GDAL supported datasets and reports the differences. In addition to reporting differences to the standard out the script will also return the difference count in it’s exit value. Image pixels, and various metadata are checked. There is…

NAME gdalbuildvrt – gdalbuildvrt Builds a VRT from a list of datasets. (compiled by default since GDAL 1.6.1) SYNOPSIS gdalbuildvrt[-tileindex field_name] [-resolution{highest | lowest | average | user}] [-te xmin ymin xmax ymax][-tr xres yres][-tap] [-separate][-b band][-sd subdataset] [-allow_projection_difference][-q] [-addalpha][-hidenodata] [-srcnodata “value [value…]”][-vrtnodata “value [value…]”] [-a_srs srs_def] [-input_file_list my_liste.txt][-overwrite] output.vrt[gdalfile] * DESCRIPTION This program builds…

NAME gdaladdo – gdaladdo builds or rebuilds overview images SYNOPSIS gdaladdo[-r{nearest, average, gauss, cubic, average_mp, average_magphase, mode}] [-b band] [-ro][-clean][–help – general] filename levels DESCRIPTION The gdaladdo utility can be used to build or rebuild overview images for most supported file formats with one of several downsampling algorithms. -r {nearest (default),average,gauss,cubic,average_mp,average_magphase,mode}: Select a resampling algorithm….

NAME gdal_utilities – GDAL Utilities The following utility programs are distributed with GDAL. • gdalinfo – report information about a file. • gdal_translate – Copy a raster file, with control of output format. • gdaladdo – Add overviews to a file. • gdalwarp – Warp an image into a new coordinate system. • gdaltindex –…

NAME gdal_translate – gdal_translate converts raster data between different formats SYNOPSIS gdal_translate[–help – general] [-ot{Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 / Float64 / CInt16 / CInt32 / CFloat32 / CFloat64}][-strict] [-of format][-b band][-mask band][-expand{gray | rgb | rgba}] [-outsize xsize[%] ysize[%]] [-unscale][-scale[_bn][src_min src_max[dst_min dst_max]]] * [-exponent[_bn] exp_val] * [-srcwin xoff…

NAME gdal_sieve – gdal_sieve.py removes small raster polygons SYNOPSIS gdal_sieve.py[-q][-st threshold][-4][-8][-o name = value] srcfile[-nomask][-mask filename][-of format][dstfile] DESCRIPTION The gdal_sieve.py script removes raster polygons smaller than a provided threshold size (in pixels) and replaces replaces them with the pixel value of the largest neighbour polygon. The result can be written back to the existing raster…

NAME gdal_retile – gdal_retile.py gdal_retile.py retiles a set of tiles and/or build tiled pyramid levels SYNOPSIS gdal_retile.py[-v][-co NAME = VALUE] * [-of out_format][-ps pixelWidth pixelHeight] [-ot{Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 / Float64 / CInt16 / CInt32 / CFloat32 / CFloat64}]’ [-tileIndex tileIndexName[-tileIndexField tileIndexFieldName]] [-csv fileName[-csvDelim delimiter]] [-s_srs srs_def][-pyramidOnly] [-r{near…