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InnovativeMinds
Fluorite | Level 6

Hi All,
 
Could you please help if there a SAS code to exactly replicate the GEODIST function?
I want to calculate the distance using latitudes and longitudes but it should exactly replicate the outcome of GEODIST function for the same input of latitudes and longitudes.

For ex:
If Distance = geodist(32.5153, -92.1567, 32.53238, -92.07976, 'DM'); is giving 4.6443116482
I want to calculate it manually to get the same value 4.6443116482.

Thanks a lot.

10 REPLIES 10
InnovativeMinds
Fluorite | Level 6

Hi All,

 

Could you please help if there a SAS code to exactly replicate the GEODIST function?

I want to calculate the distance using latitudes and longitudes but it should exactly replicate the outcome of GEODIST function for the same input of latitudes and longitudes.

 

Thanks a lot.

 

Reeza
Super User

Do you mean manual code? ie 

 

( x**2 + y **2 ) ^ 1/2 .....

 

Because SAS has a GEODIST function so I'm confused....

InnovativeMinds
Fluorite | Level 6
Hi, Yes, I'm looking for manual code not the function.
InnovativeMinds
Fluorite | Level 6

For ex:

If Distance = geodist(32.5153, -92.1567, 32.53238, -92.07976, 'DM'); is giving 4.6443116482

I want to calculate it manually to get the same value 4.6443116482.

 

Reeza
Super User

Out of curiousity, why?

InnovativeMinds
Fluorite | Level 6

I need to work and explain non-SAS user how I'm coming up with that (GEODIST) value.

Reeza
Super User

Note that I've merged this into one thread since it's the exact same question. 

PGStats
Opal | Level 21

This might be more difficult than you expect. SAS doesn't use the simple great circle distance formulas that you can find on Wikipedia. They are calculating the distance on some ellipsoid approximating the shape of the Earth. You can look at the reference that they give here.

 

https://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf

PG
Reeza
Super User

Before GEODIST() there was a %geodist macro. You can find it via Google, it's relatively close but not exact to the numbers from GEODIST(). 

 

 

 

 

InnovativeMinds
Fluorite | Level 6

Thanks, PG. Appreciate the information.

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