Lesson 2

Objectives

• First we will generate a maplet with the following parameters:
  • center at -40,135 (lat,lon)
  • scale = 1 km/px
  • size = 99 x 99 px or 99 x 99 km
  • name = ‘LMK000’
• Then we will tile LMK000 with 9 overlapping better resolution maplets (LMK001-LMK009)

LITHOS: Create New Landmark

• LITHOS.e

• c - create new landmark name

• LMK000 - landmark name

• l - define landmark control point by specifying a latitude and longitude on the body

• -45,135 - lat, lon

• 1,49 - enter scale (km/px), qsz

• i - input landmark

• LMK000 - landmark name (as previously named)

• y - check for images?

• 0.5 - fractional width

• n - reject invisibles

• In a second terminal:
  • cd Vesta
  • ls-Irt
  • display LMRK_Display1.pgm

LITHOS: Eliminate Pictures from Landmark

• e - eliminate pictures from landmark

• a - auto-eliminate

• 0,40,.2,.2,0,2 - Input INVLIM,SLIM,CLIM,ILIM,RSMN,RSMX

• INVLIM = 1000 * MAX INVISIBLE FRACTION (0-1000)
• SLIM = MAX EMISSION ANGLE (0-90)
• CLIM = MIN FRACTION OF VISIBLE (0-1)
• ILIM = MIN FRACTION IN SHADOW (0-1)
• RSMN = MIN IMGSCALE/MAPSCALE (0-inf)

• RSMX = MAX IMGSCALE/MAPSCALE (0-inf) =>set according to printout and LMRK_DISPLAY

• Most permissible: 1000,90,0,0,0,inf => does not throw any image away

• Least permissible: 0,0,1,1,inf,0 => throws all away