ANSI-C program: mosaic.c
NAME
mosaic - Mosaic geocoded images with same format, map projection,
and pixel spacing parameters
SYNOPSIS
mosaic <nfiles> <data_in_1> <DEM_par_in_1>
<...> <...> <data_out> <DEM_par_out>
<mosaic_flag> <format_flag>
| <nfiles> | number of input data files |
| <data_in_1> | first input data file |
| <DEM_par_in_1> | first input DEM parameter file |
| <...> | further input data files |
| <...> | further input DEM parameter files |
| <data_out> | output mosaic file |
| <DEM_par_out> | output DEM parameter file. If this file exists, then the bounds of the mosaic are read from theparameter file, otherwise bounds including all input data will be computed and written to the parameter file |
| <mosaic_flag> | mosaic method flag: 0: first image 1: average all overlapping images |
| <format_flag> | format_flag input/output data format flag 0: float (REAL*4) 1: fcomplex 2: int (INTEGER*4) 3: short (INTEGER*2) 4: unsigned char 5: SUN raster or BMP image files (8 or 24 bit) |
EXAMPLE
mosaic 2 lv1.gtc lv1.dem_par lv2.gtc lv2.dem_par lv_mosaic.gtc lv_mosaic.dem_par 0 0
Mosaics 2 scenes of floating point terrain corrected data lv1.gtc and lv2.gtc The projection parameters for the input scenes are stored in the DEM parameter files lv1.dem_par and lv2.dem_par. The output mosaic image is stored in lv_mosaic.gtc with the associated parameter file lv_mosaic.dem_par. Overlapping regions of the mosaic default to the data from the first file encountered that covers a region.
DESCRIPTION
This program supports creation of image mosaics from a set of
geo-referenced images each with its own DEM parameter file
describing the coverage area. All of the images must have the
same posting and projection. Since no interpolation is performed,
the map grids must overlay such that there is only an integer
number of samples offset between the different images comprising
the mosaic. This condition can be assured by proper selection of
the DEM parameters at the time when the terrain corrected image
swaths are produced. The dimensions of the output map can
be determined either by examining all the input maps and letting
the program automatically generate a DEM parameter file that
covers all inputs, or giving as input a DEM parameter with user
determined bounds.
The user has the option of selecting either averaging of pixel values that overlay, or to have the first image written to a location in the output map as the mosaic value.
Mosaics of data in numerous formats is supported including float (4-bytes/sample), floating point complex (8-bytes/sample), unsigned bytes, and 2 and 4 byte integers. There is also support for mosaicking of SUN raster and BMP format image files.
SEE ALSO
typedef_DIFF.h, display.h