Full text: Reprints of papers (Part 4a)

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
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The figures in these expressions show an increasing series of accu- 
racy viz. 1.22, 0.87 and 071 for m, — u where wu is the standard error 
of the y-parallax measurements according to the method of the least 
square. 
In order to facilitate the calculation of the coefficients on the form, 
a nomogram was designed with logarithmic scales with modules between 
100 and 400 mm. Fig. 2. 
In order to simplify the determination of ¢- and o-corrections b 
means og ground elevations a monogram was designed. Due to the 
excellence of the results mentioned above it is, however, doubtful that 
such a monogram will be needed for ordinary models. Its greatest 
usefulness will probably be for models with water on one side of the 
base. Formulas and form for this type of models are completed and will 
be published together with the monogram. 
References 
1. Hallert, B.: Über die Herstellung photogrammetrischer Pline. Thesis, The 
Royal Institute of Technology, Stockholm 1944. 
2. — Contribution to Theory of Errors for Double Point Intersection in Space. 
Transactions of The Royal Institute of Technology, Stockholm 1950. 
3. Schwidefsky, K.: Grundriss der Photogrammetrie. Fiinfte Auflage. Stuttgart 
1954. 
Praktisk tillampning av numerisk relativorientering. 
I [1] och [2] har Hallert visat, att relativorienteringens noggrannhet 
kan héjas visentligt genom att korrektioner till orienteringselementen 
beráknas ur restparallaxer, som miitas i 6 resp. 9 punkter. Forfarandet 
innebàr utjámning av Gverbestimda mitningar enligt minsta kvadrat- 
metoden. 
Med ledning hirav har ett rikneformulir konstruerats, som gor det 
mojligt att snabbt genomfora sidana berakningar for alla fórekomman- 
de orienteringsfall. De koefficienter, som ingár i beràkningarna och 
bero av den aktuella modellen, erhállas medelst ett monogram. 
Erfarenheten har visat att kvadratiska medelvirdet av restparallaxer- 
na i 9 punkter efter 2 a 3 iterationer nedgár till omkring 0.01 mm i bil- 
den. Genom korrektion av enbart by med medelvärdet av restparallaxer- 
na forbättras denna siffra nigot. Medelfelet i mitningen av y-paral- 
laxer har i samband med korrektionsberákningarna visat sig i allmänhet 
inte overstiga 0,006 mm. 
En jamforelse mellan medelfelet och kvadratiska medeltalet visar 
om annu en iteration bor genomforas. 
Ett sálunda erhállet protokoll óver orienteringsarbetet àr várdefullt. 
  
  
   
  
  
  
  
  
    
  
  
  
  
  
  
  
   
   
   
     
  
  
  
   
  
  
  
  
  
  
   
  
  
  
  
  
    
 
	        
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