Metes and bounds to GPS?

[holokaib]

Hello,

 

I bought 62 acres in hawaii and got a metes and bounds survey done. I am hoping to convert it to gps. In the description it states the beginning point is 13,467.28ft north and 11,413.03 ft East from GST station KAPUKAWAA and running by azmuths measuered clockwise from true south.

 

Is there any way to find the GPS coordinates of the starting point if I know the above distances from GPS station KAPUKAWAA?

 

Mahalo!

 

Holokai

[68-eldo]

Holokai,

The data sheet for KAPUKAWAA RESET can be found here The data sheet for KAPUKAWAA RESET can be found here http://www.ngs.noaa.gov/cgi-bin/ds_desig.prl

 

The coordinates are N 19° 11.241 W 155° 54.436 (NAD 83)

By my calculation that comes out to be N 19 11.243, W 155 54.434

[holokaib]

Thanks! I put that into:

 

http://www.gpsvisualizer.com/calculators

 

to calculate the coordinates for a given bearing and distance. Then I had it draw maps on google maps but it looked like it was the wrong place. Do you think the cooridinates are wrong or the google maps?

[68-eldo]

How far off is it?

Remember that the bearings (azimuth) are from south while Google maps and GPS Visualizer use north as the starting point for azimuth.

I did a similar exercise plotting the right of way for a railroad on Oahu. The results were right on when displayed in Google Earth. The hard part was remembering to add or subtract 180 from all the azimuths.

 

I used an old version of GeoCalc (version 0.9.50) for all the calculations. It looks like they are up to 4.20 now

[Bill93]

You could also have a grid vs ground issue. Does the "metadata" from the survey tell whether they are using a state plane coordinate system, using distances on the ellipsoidal earth model, or surface distances? If state plane or a low-distortion custom projection, the azimuths may be relative to that grid and not geodetic.

[DaveD]

As noted by Bill93 without addition information there are different ways to evaluate this information. That being said, to one extent or another most of them would have differences that while significant interms of defining the boundary would be small compared to what can be observed with a hand-held resource grade GPS receiver. Based on the information you provided I calculate the approximate Point of Beginning as 19-13-28.2/155-52-27.4 or 19-13.470/155 52.457

[68-eldo]

DaveD is a lot closer than I am. It seems GeoCalc does not like comas in the distance numbers. I now get N 19 13.466, W 155 52.451 for the starting point. That’s a difference of 42 feet from DaveD's.

 

Do they list any markers such as pipe driven into the ground to indicate the location of corners?

[+Holtie22]

Why don't you just ask the surveyor to do the conversion for you? Then you know it will be right.

[holokaib]

Hello,

 

Thanks everyone for taking the time to reply! Sorry about the lag but I was back in Hawaii and had no cell phone reception. It was pretty far off when I first did it. After getting there I was able to find one corner then follow the bearings(after realizing it was 180degs off!) I was able to locate all the pins at the top of the property but not at the bottom. It's over a mile to the lower pins so I'm still working to find the gps for the original pins as the lower ones are faaar away. I am waiting to hear back from the surveyor but they are lagging. 68-eldo, I entered the coordinates you gave me and they are close but north of where I found the pin.

 

DavidD, thanks for the help! I can't seem to convert your coordinates to anything that works in google maps. Does anyone know what format that is? I've been googling it but it can be confusing....

 

I'll keep googling it! Thanks again!

[holokaib]

Ok DavidD. I figured out how to enter your cooridinates(19°13'28.2"N 155°52'27.4"W) into google maps and it looks spot on to the beginning. Wooha! Now I'll try to use it to find the other points.

[holokaib]

ok!

 

Using the first coordinate DavidD gave me(is the second one the same in a diff format?) I came up with these points:

 

NE Corner 19°13'28.2"N, 155°52'27.4"W

NW corner 19.22496963086, -155.90204969791

SW Corner 19.22442865975, -155.90220401018

 

SW pin 19.22441070612, -155.90166538364

2nd SW pin 19.22439990821, -155.90134034657

 

SE corner 19.22348553461, -155.87392443331

 

They all look good except the last. The SE corner? Could that be because it's at a higher altitude just too many projections?

 

Thanks,

Holokai

[DaveD]

ok!

 

Using the first coordinate DavidD gave me(is the second one the same in a diff format?) I came up with these points:

 

NE Corner 19°13'28.2"N, 155°52'27.4"W

NW corner 19.22496963086, -155.90204969791

SW Corner 19.22442865975, -155.90220401018

 

SW pin 19.22441070612, -155.90166538364

2nd SW pin 19.22439990821, -155.90134034657

 

SE corner 19.22348553461, -155.87392443331

 

They all look good except the last. The SE corner? Could that be because it's at a higher altitude just too many projections?

 

Thanks,

Holokai

[DaveD]

Without knowing the bearings/azimuths/directions along the boundary and the corresponding distances it's not possible to validate any of the coordinates you posted.