grid

Superimpose a user defined grid on an input image. A graticule is defined in terms of latitude and longitude coordinates (MODE=GROUND), while a simple rectangular grid is based on line and sample coordinates (MODE=IMAGE).

Example 1: For a basic latitude/longitude graticule with grid lines drawn every 10 degrees, your parameters would be: Select GROUND mode, BASELAT=0, BASELON=0, LATINC=10, LONINC=10. Latitude and longitude lines will be drawn at even 10 degree increments, based on zero. Superimpose a grid on an input image using input from the user. The grid can be defined in terms of latitude and longitude or simply lines and samples. For example, if you wanted to draw a grid that has an intersection at line 23, sample 17, with vertical lines every 30 pixels and horizontal lines every 40 pixels, your parameters would be:

BASELINE=23 BASESAMPLE=17 SINC=30 LINC=40

Example 2: For a rectangular grid that has an intersection at line 23, sample 17, with vertical lines every 30 pixels and horizontal lines every 40 pixels, your parameters would be:

MODE=IMAGE BASELINE=23 BASESAMPLE=17 SINC=30 LINC=40

Example 3: For a latitude/longitude graticule with a grid intersection at LAT 50 degrees, LON 60 degrees, with latitude lines drawn every two and a half degrees and longitude lines drawn every three degrees, your parameters would be:

MODE=GROUND BASELAT=50 BASELON=60 LATINC=2.5 LONINC=3

Example 4: If desired, you may draw a latitude/longitude graticule within a subarea of an image. For example, suppose you have a global image (full latitude and longitude extent), but would like a 10 degree graticule drawn only between latitudes -20 degrees and +50 degrees and only between longitudes 90 degrees and 180 degrees. In this case, your parameters would be:

MODE=GROUND BASELAT=0 BASELON=0 LATINC=10 LONINC=10 MINLAT=-20 MAXLAT=50 MINLON=90 MAXLON=180

This approach can also be used to produce grid variations as desired through multiple executions of the grid application.