Differences between revisions 3 and 6 (spanning 3 versions)
 ⇤ ← Revision 3 as of 2018-06-05 21:04:23 → Size: 6512 Editor: EricPalmer Comment: ← Revision 6 as of 2019-08-27 14:43:41 → ⇥ Size: 6368 Editor: EricPalmer Comment: Deletions are marked like this. Additions are marked like this. Line 9: Line 9: * Then we will tile START5 with 9 overlapping better resolution maplets (LMK001-LMK009) Line 40: Line 39: * '''0,50,.2,.2,0,4''' - Input INVLIM,SLIM,CLIM,ILIM,RSMN,RSMX * '''0,50,.6,.6,0,4''' - Input INVLIM,SLIM,CLIM,ILIM,RSMN,RSMX Line 43: Line 42: * .2 means the image must fill at least 20% of the frame   * .2 means the illuminated service must fill at least 20% of the frame * .6 means the image must fill at least 60% of the frame   * .6 means the illuminated service must fill at least 60% of the frame Line 80: Line 79: {{attachment:lesson2_GettingHeights.jpg||width=300}} Line 111: Line 109: * '''.7''' - enter correlation limit * '''.5''' - enter correlation limit Line 114: Line 112: * '''40''' - number of iterations * '''44''' - number of iterations Line 136: Line 134: * '''.7''' - enter correlation limit * '''.5''' - enter correlation limit Line 139: Line 137: * '''40''' - number of iterations * '''44''' - number of iterations

# How To Build A Landmark

### Objectives

• First we will generate a maplet with the following parameters:
• center at -10, 350 (lat,wlon)
• scale = .001 km/px
• size: Q=49, width=99 x 99 px
• name = ‘START5’

### LITHOS: Create New Landmark

• lithos

• c - create new landmark name

• START5 - landmark name

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

• -10 350 - lat, lon

• .001,49 - enter scale (km/px), qsz

### LITHOS: Input the new landmark

Once the landmark is created, you need to "load" it into active memory. You use the lithos command "i" from its main menu.

• i - input landmark

• START5 - landmark name (as previously named)

• y - check for images?

• 0.5 - fractional width. (This is almost always used)

• n - reject invisibles

In a second terminal, review the LMRK_DISPLAY1.pgm image. You can use ImageMagick's "Display" command, Graphics Converter, or if using a Mac, pgm files can be displayed in the Finder or Preview.

cd <working dir>
display LMRK_DISPLAY1.pgm

You can also use the SPC_Tools: landmarks

### LITHOS: Eliminate Pictures from Landmark

• e - eliminate pictures from landmark

• n - auto-eliminate new images only (a for auto-eleiminate)

• 0,50,.6,.6,0,4 - Input INVLIM,SLIM,CLIM,ILIM,RSMN,RSMX

• 0 is typical. If you have objects that are obscuring the maplet, then this becomes important
• 50 is the emission angle that we keep
• .6 means the image must fill at least 60% of the frame
• .6 means the illuminated service must fill at least 60% of the frame
• 0 is minimum resolution -- almost always is 0
• 4 is the maximum resolution ratio (how many times bigger are the image pixels than the GSD. 3 or 4 is typical. 6+ is seldom effective)
• 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

• display LMRK_DISPLAY1.pgm

### LITHOS: Get Heights from Shape and Find Normal, V

• m - get heights from shape model

• n - find normal

• 2 - normal from heights

• m - get heights from shape model

• u - update landmark file (save)

• 1 - save map

In 2nd terminal:

cd Bennu
display LMRK_Display1.pgm
more LMRKLIST.TXT
more LMKFILES/START5.LMK
more MAPFILES/START5.MAP
showmap
START5

Then display the START5.pgm (xv, imageMagick, convert, GraphicConverter)

### LITHOS: Align Landmarks in Pictures

 Option 1. Use this when the template you see in LMRK_DISPLAY1.pgm is poor Option 2 (typical). Use this as much as you can 1 - align landmarks 1 - align landmarks 3 - align with picture 0 - align with template 23 - picture #2 in LMRK_DISPLAY 3 - enter spacing 1 - enter spacing n - new spacing? y - new spacing? Yes b/c it only aligned a few images 0 - continue 2 - enter spacing y - update landmark pixel locations? y - new spacing? Yes b/c it only aligned a few images 1 - align landmarks 3 - enter spacing 0 - align with template y - new spacing? Yes b/c 3 caused a couple images to shift>10px 1 - enter spacing 2 - enter spacing n - new spacing? n - new spacing? No, lets just use the correlated images first 0 - continue 0 - continue y - update landmark pixel locations? y - update landmark pixel locations? 1 - align landmarks 3 - align with picture 1 - picture #2 from last iteration became picture #1 1 - enter spacing n - new spacing? 0 - continue y - update landmark pixel locations?

display LMRK_Display1.pgm

### LITHOS: Find Template

• u - update landmark file (save)

• 1 - Save map

• 0 - find template

• c - use correlated

• .5 - enter correlation limit

• 0 - find template

• 0 - continue

• 44 - number of iterations

display LMRK_Display.pgm

### LITHOS: Align Landmarks and Find Template

• 1 - align landmarks

• 0 - auto align

• 1 - enter spacing

• y - new spacing?

• 2 - enter spacing

• n - new spacing?

• 0 - continue

• y - update landmark pixel locations?

• 1 - align landmarks

• 0 - auto align

• 1 - enter spacing

• n - new spacing?

• 0 - continue

• y - update landmark pixel locations?

display LMRK_Display1.pgm

• 0 - find template

• c - use correlated

• .5 - enter correlation limit

• 0 - find template

• 0 - continue

• 44 - number of iterations

display LMRK_DISPLAY1.pgm

REPEAT ONCE

### LITHOS: Solve for Heights

• 2 - find heights

• 8 - fill with shape

• 2 - include existing heights

• .01 - input fraction of points

• 1 - auto include neighboring maps

• 4 - include limb vectors

• 1,2.5,3 - input expansion, res/scale limit, d_hgt limit

• 6 - include differential stereo

• y - autoheights?

• 0 - begin iteration

• .025 - input weight

• 30 - enter number of iterations

• 0 - end iterations

display LMRK_DISPLAY1.pgm display slope.pgm

### LITHOS: Final Alignment and Save

• 1 - align landmarks

• 0 - auto align

• 1 - enter spacing

• n - new spacing?

• 0 - continue

• y - update landmark pixel locations?

• # We are skipping V-4 fo

How To Build A Landmark (last edited 2019-08-27 14:43:41 by EricPalmer)