Let's come up with a formula

[+poksal]

Thing is Streets USA does a great job of putting the GPS cord. of the mouse cursor lower right corner. This is great except it is in NAD27. I know there are places to go and type in the NAD27 and get WGS, but who knows the formula so we can put it into Excel and have a live translation? Wouldn't this be handy? Ok, someone cough up the formulas. .. wink ..

[+Jamie Z]

There's no formula.

 

NAD27 is based on a bunch of usually unrelated surveys. Errors within the system are not consistent.

 

WGS84 is a global system. You can't simply convert between the two because NAD27 has almost random errors in it, depending on location.

 

I'm no expert, but I'm sure there is a more technical explanation.

 

Jamie

[+Alan2]

NADCOM of the USGS will provide the conversion between NAD27 and NAD83 and vice versa. NAD83 is really the same as WGS84.

Alan

[Kerry.]

Distortion models are really the only (practical/accurate) way for this type of conversion as per Alan's NADCOM link.

 

Cheers, Kerry.

 

I never get lost everybody keeps telling me where to go

[+Majormd&PUNditOK]

How about a formula to convert differences in Lat/Long to feet or meters or miles?

 

I figure latitude would be pretty constant, but the longitude would vary widely, depending upon your latitude.

 

Anyone know this?

 

- Sue

[+Markwell]

quote:

---

Originally posted by Majormd&PUNditOK:

How about a formula to convert differences in Lat/Long to feet or meters or miles?

---

 

I don't know the formula, but it is covered here.

 

Markwell

Chicago Geocaching

[+Alan2]

Formulas you might find useful.

 

ALan