Usage: gdal_grid [--help] [--long-usage] [--help-general]
                 [--quiet] [-of <output_format>]
                 [-ot Byte|Int8|[U]Int{16|32|64}|CInt{16|32}|[C]Float{32|64}]
                 [-txe <xmin> <xmax>] [-tye <ymin> <ymax>]
                 [-outsize <xsize> <ysize>] [-tr <xres> <yres>]
                 [-co <NAME>=<VALUE>]... [-zfield <field_name>]
                 [-z_increase <increase_value>] [-z_multiply <multiply_value>]
                 [-where <expression>] [-l <layer_name>]...
                 [-sql <select_statement>] [-spat <xmin> <ymin> <xmax> <ymax>]
                 [-clipsrc] [-clipsrcsql <sql_statement>]
                 [-clipsrclayer <layername>] [-clipsrcwhere <expression>]
                 [-a_srs <srs_def>]
                 [-a <algorithm>[[:<parameter1>=<value1>]...]]
                 [-oo <NAME>=<VALUE>]...
                 <src_dataset_name> <dst_dataset_name>

Note: gdal_grid --long-usage for full help.