## page was renamed from bigmap.in bigmap scale for maplet overlaps
= Basic Tiling - Achieving the Desired Maplet Overlap =
(compiled by DL)

'''Purpose:''' Basic tiling allows the user to generate a suite of maplets at a higher resolution which tile a region of interest. The overlap of the new maplets is controlled by the ratio of maplet ground sample distance (GSD) to bigmap scale. This 'How-To' explains how the user achieves the desired maplet overlap percentage.

== Generating a Tiling Bigmap ==

The user must generate a bigmap which covers the region of interest and whose parameters are set up such that the new maplets will overlap by the desired amount.

==== Bigmap .in File ====

The user must adjust the bigmap pixel scale in the tiling .in file in order to achieve the desired maplet overlap ratio. This is done by applying a multiplicative factor to the maplet ground sample distance (GSD) as follows:
 maplet GSD = 10cm<<BR>>
 bigmap scale = 10cm * 1.5 = 15cm to achieve a 25% overlap

Example set of multiplicative factors:
||Multiplicative Factor||Maplet Overlap||Example for Maplet GSD = 10cm||
||0.8||58%||bigmap scale = 10cm * 0.8 = 8cm||
||1.0||50%||bigmap scale = 10cm * 1.0 = 10cm||
||1.3||33%||bigmap scale = 10cm * 1.3 = 13cm||
||1.5||25%||bigmap scale = 10cm * 1.5 = 15cm||
||2.0||0||bigmap scale = 10cm * 2.0 = 20cm||

Example BGMAP1.in:
{{{
m                                   <- To locate, reference to a map
START1                              <- Reference map name
   49 49                            <- Reference map pixel/line location
   0.00013  130  1.23400  1000      <- scale (km/pixel), Q size, integer random seed, maximum maplet scale
BGMAP1                              <- bigmap name
1                                   <- bigmap program commands
.005
.025
1
0
0
1
1
1
1
1
1
0
0
}}}