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jserafy
Calcite | Level 5

Hi:

I've read it is improper to average a series of latitude-longitude coordinates without first converting to Cartesian coordinates.

If someone could provide sas code to process the example data below, I'd appreciate it. 

-----------------

data a; input location lat lon;
cards;
1  27.7970   -93.6191
2  28.0290 -93.6310
3  28.3661  -91.1429
;

*Code to convert above spherical coordinates to Cartesian coordinates;

proc print; var location cart_lat cart_lon; run;

* Code to convert the Cartesian coordinates back to spherical coordinates;
proc print; var location lat lon; run;

1 REPLY 1
ballardw
Super User

Purpose?

 

How large of a geographic region are you dealing with? For most purposes if the area is less than several hundred square miles or kilometers the lat/long behave like Cartesian coordinates for most purposes.

 

 

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