make_tilefile

(compiled by DL)

Purpose: Program to generate the pixel/line maplet-center locations required to complete the tiling of a bigmap at a user-specified resolution.

The make_tilefile utility analyses a coverage_m.pgm file, which is the output of map_coverage, for areas that still need to be tiled. The output of this program is then put in the make_scriptT.in file. (Taken from SPOC v3.02A PDF/UTILITIES/make_tilefile.f File Reference.)

Requires

• coverage_m.pgm - A Portable Graymap Format image of the bigmap-tiling in the user-specified maplet resolution range, generated using map_coverage.

Output

• std-out - list of bigmap pixel/line coordinates for new maplet center locations.

Using make_tilefile

The program requires a single user-input - Upwards? (y/n):

 Upwards? (y/n)
n
      50   50
#    100   50
#    150   50
     200   50
      50  100
     100  100
     150  100
     200  100
      50  150
     100  150
#    150  150
     200  150
      50  200
     100  200
     150  200
     200  200
END

 Upwards? (y/n)
y
      50  200
     100  200
     150  200
     200  200
      50  150
     100  150
#    150  150
     200  150
      50  100
     100  100
     150  100
     200  100
      50   50
#    100   50
#    150   50
     200   50
END

The output columns are the pixel and line coordinates respectively for bare points in the bigmap. Locations which already contain a maplet in the required resolution-range are marked with # and will be ignored by make_scriptT (refer to relevant page for further details).

Upwards? - Y: Pixel/line coordinates for tiling starting at the Southern-most line, West-to-East and South-to-North.

Upwards? - N: Pixel/line coordinates for tiling starting at the Northern-most line, West-to-East and North-to-South.

The user may enter input and capture output in a single command line as follows:

echo "N" | make_tilefile > out

However, the first line of output will need to be discarded using a text editor before appending to the make_scriptT.in file (refer to relevant page for further details).

The user should note that make_tilefile is set to make the pixel and line coordinates in intervals of 50 because maplets have a 99 by 99 pixel dimension, meaning the center will always be at the (50,50) coordinate with respect to a maplet. Thus, when a maplet is made at the same resolution as the bigmap, the maplet center coordinates will be multiples of 50.