Map co-ordinates conversion

B

Bill R

The following converts latitude co-ordinates in cell A3 from NN:NN:NN and
N:NN:NN format to N.NN format. (A similar formulae does the same for
longitude co-ordinates.)

=IF(RIGHT(A3,1)="W",IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60))*-1,IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60)))

It is complicated as it needs to accommodate source information in degrees
in NN and N format (others are given in NN format) and, of course, the
output to be both positive (east of Greenwich and north of the equator) and
negative. Is there a better (shorter) formulae that will do the same job?

Thanks.

Bill R
 
M

macropod

Hi Bill,

Assuming your input in A3 is, say W127:30:27, you can get the decimal representaion by:
=RIGHT(A3,LEN(A3)-1)*24*IF(LEFT(A3,1)="W",-1,1)
 
R

Ron Rosenfeld

The following converts latitude co-ordinates in cell A3 from NN:NN:NN and
N:NN:NN format to N.NN format. (A similar formulae does the same for
longitude co-ordinates.)

=IF(RIGHT(A3,1)="W",IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60))*-1,IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60)))

It is complicated as it needs to accommodate source information in degrees
in NN and N format (others are given in NN format) and, of course, the
output to be both positive (east of Greenwich and north of the equator) and
negative. Is there a better (shorter) formulae that will do the same job?

Thanks.

Bill R
Click to expand...

To convert coordinates in "degrees" to decimal, merely multiply by 24 and
format the results as Number (or General) with the required number of decimal
places.

So, with the proper format for the cell:

=IF(ISERR(FIND(":",A1)),A1,IF(RIGHT(A1)="S",-1,1)*LEFT(A1,LEN(A1)-1)*24)

This formula has no error checking for blank cells or improperly formatted
entries (e.g. no N or S at the end). That could certainly be easily added.

--ron
 
B

Bill R

Thanks,

NSEW is usually after the co-ordinates so I just swapped the RIGHT and LEFT
and it worked OK. BTW, when using NSEW the number can only go up to 90 (or
should that be 89.999...?)

That's certainly compacted an awful looking formulae.

Bill R

macropod said:
Hi Bill,

Assuming your input in A3 is, say W127:30:27, you can get the decimal
representaion by:
=RIGHT(A3,LEN(A3)-1)*24*IF(LEFT(A3,1)="W",-1,1)

--
Cheers
macropod
[Microsoft MVP - Word]


Bill R said:
The following converts latitude co-ordinates in cell A3 from NN:NN:NN and
N:NN:NN format to N.NN format. (A similar formulae does the same for
longitude co-ordinates.)

=IF(RIGHT(A3,1)="W",IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60))*-1,IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60)))

It is complicated as it needs to accommodate source information in
degrees in NN and N format (others are given in NN format) and, of
course, the output to be both positive (east of Greenwich and north of
the equator) and negative. Is there a better (shorter) formulae that
will do the same job?

Thanks.

Bill R
Click to expand...
Click to expand...
 
B

Bill R

Oops.

Of course you can go up 180 (or is that 179.99...) degrees east or west to
make a complete circle. It's north or south that only goes up to 90 degrees
because the other 180 degrees is on the other side.

Apologies.

Bill R
Thanks,

NSEW is usually after the co-ordinates so I just swapped the RIGHT and
LEFT and it worked OK. BTW, when using NSEW the number can only go up to
90 (or should that be 89.999...?)

That's certainly compacted an awful looking formulae.

Bill R

macropod said:
Hi Bill,

Assuming your input in A3 is, say W127:30:27, you can get the decimal
representaion by:
=RIGHT(A3,LEN(A3)-1)*24*IF(LEFT(A3,1)="W",-1,1)

--
Cheers
macropod
[Microsoft MVP - Word]


Bill R said:
The following converts latitude co-ordinates in cell A3 from NN:NN:NN
and N:NN:NN format to N.NN format. (A similar formulae does the same
for longitude co-ordinates.)

=IF(RIGHT(A3,1)="W",IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60))*-1,IF(MID(A3,2,1)=":",(LEFT(A3,1))+(MID(A3,3,2)/60)+(MID(A3,6,2)/60/60),(LEFT(A3,2))+(MID(A3,4,2)/60)+(MID(A3,7,2)/60/60)))

It is complicated as it needs to accommodate source information in
degrees in NN and N format (others are given in NN format) and, of
course, the output to be both positive (east of Greenwich and north of
the equator) and negative. Is there a better (shorter) formulae that
will do the same job?

Thanks.

Bill R
Click to expand...
Click to expand...
Click to expand...
 
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