2 replies to this topic

[RonInNJ]

Hello,

I need to convert a list of cartesian coordinates to Lat/Long. I have an origin of 0 feet north and 0 feet west which corresponds to 41 04 53 north and 74 36 02 west. North is 19 degrees, 5 minutes east of true north. Here are a couple of the coordinates I was given:
1432 North 906 West
1322 North 777 West

Could someone help me out or point me to a reference or resource so I could educate myself?

Ron

[graveldraw]

I need to convert a list of cartesian coordinates to Lat/Long. I have an origin of 0 feet north and 0 feet west which corresponds to 41 04 53 north and 74 36 02 west. North is 19 degrees, 5 minutes east of true north. Here are a couple of the coordinates I was given:
1432 North 906 West
1322 North 777 West

First you need to convet to a projected coordinate sytem, then back to lat-long. I used Corpscon 6 from Army Corps of Engineers to convert the origin lat-long to state plane. Other applications can do this also. You need to do Setup for each conversion, then User Defined Data File for a batch conversion. Your delimiter can be tab, comma, or other.

Setup used to convert
System: State Plane
Datum: NAD83
Zone: New Jersey
Units: U.S. Survey Foot
Orgin converted
41 04 53N -> 818869.4
74 36 02W -> 458904.8

Add/substract your point values to the orgin.
1432 N (818869.4 + 1432) = 820301.4 (Y)
906 W (458904.8 - 906) = 458904.8 (X)

Convert back to lat-long
820301.4 (Y) -> 41 05 07.14
458904.8 (X) -> 74 37 13.86

Check your output using a GIS application. It is easy to get XY mixed up, at least for me.

Hope this helps,
Dan

[RonInNJ]

Dan you're the man! Thanks for the help.

Ron