navboxes [ parameter=value ... ] [ inputfile outputfile ]
Parameters are: coast_file, min_coast_pts, min_good_boxes, max_coast_corr,
navboxes is an implementation of the algorithm created at SeaSpace. The input to this program is any image that can be earth-located. First, 1-degree image boxes with the coastline are selected. Then, the shape of the coastline is analyzed for each selected box. The boxes with the coastline that can be used for navigation are selected and their parameters are saved to the output dataset. The output of this program is a dataset, defining selected boxes using both image coordinates (x, y, delta_x, delta_y) and earth coordinates (latitude, longitude, delta_lat, delta_lon).
The name of file used to generate the coastline. The default is wdb2.cil.
Minimal number of the coastal points the box should have to be considered.
The valid answer is any positive number. The default is 50.
Maximum allowed correlation of the coastline. Correlation 100% means that the coastline is a straight line. It was empirically found that even the 90% correlation can be used for navigation and is a very typical value for many coastlines.
The valid answer is any integer number between 0 and 100. The default is 90.
Minimum required number of boxes selected from the image.
The valid answer is any positive number. The default is 1.
Select boxes from AVHRR image.
[1] % navboxes n11.93321.1211.avhrr n11.93321.1211.boxes coast_file : char(255) ? [wdb2.cil] max_coast_corr : int ? [90] 80 min_coast_pts : int ? [50] min_good_boxes : int ? [1] 3 n11.93321.1211.avhrr: 5 boxes selected
Last Update: $Date: 1998/05/29 18:42:44 $