Difference in Coordinates (Google vs Terraserver)

Because of the formula they are using to translate the address info to the gps plot. When you get there, record the coordinates and see which one is closer...but heck - if you're within a city block in distance using either one, you won't "not find" where you're going...

Those coordinates are in Asia. I'm guessing that you meant -96.33689.

The first set appear to be closer to where MapSource places the address.

I always thought spotting something on a map would remain constant. Do you think the coordinates given are only a block apart?

I always drop the - (minus). In my mind I just take that as a given, cause I'm not going to Asia yet. That's in April. )

Here are links in Google Maps.

http://tinyurl.com/28r6cq

http://tinyurl.com/yvsuwn

Those points appear to be about 1.5 miles apart. Obviously, TerraServer is using a different database or algorithm for the addresses. The coordinates of a point on the earth obviously is a constant, however, since the addresses are man-made, the different sources can (and do) list them differently.

In MapSource, that second set appears to be closer to 5570.

M.M. beat me to the reply...I'll simply concur.

City addresses will be within a block or so...rural addresses that are interpolated to coordinates will probably be further off than a few city blocks in distance.

If you don't see me on here anymore, you will know I am LOST, and wandering around somewhere in the wilderness of Texas or Hongkong. No really, I take what you said with all sincerity. That's the reason for my post. I knew someone would come up with the right answers, and two of you did. I think I will go with my first set from Google.

well as long as you don't end up in hong kong when you are trying to get somewhere in texas, I consider that good....lol.

Here is a third version from: http://www.gpsvisualizer.com/geocoder/

latitude,longitude,name,desc,color
32.634012,-96.350391,"6570 CR283, Kaufman, TX",-,

Heck, I've been to Hong Kong and Texas, San Antonio (time while in the USAF) and I like HK a lot better. Well except for the humidity in the summer. HK is my second favorite city in the world, NYC is first. Gee when I am in Flushing it is almost like being in HK )

For the POI Factory.... is there a standard of which lat and long source to use?

I realize we can use anything... but ... has everyone come to consensus on one as being the standard?

but I use the co-ords from my GPSr as the final answer. Since it will ultimately direct me to where I want to go, I modify any POI lat/longs to make them "fit" to the accuracy of the GPSr.

dd

Recording the co-ords from the GPSr is the final answer. The geocoding results are best "guesstimates" extrapolated with a formula - they will rarely be as "spot-on" as the GPSr.

the coordinates from the GPS, but it couldn't map the address I wanted. The particular property has been there for years, and years, and it has not been picked up by Garmin's mapping service.

I was able to find it on my Zumo.

I went to Where to? > Address > Spell State > TX > Spell City > Kaufman > 6750 > CR-283 and it found the same location as on Google Maps.

The dash (-) seems to be important on the GPS unit.

It is all about the punctuation, and sometimes none where you think it should be when finding things by address on the GPSr - and each make and model seems to have quirks all their own...kind of like people....

Yeap, I have noticed that punctuation makes a huge difference.

Yeap, I have noticed that punctuation makes a huge difference.

M.M., I entered it into my 660 exactly as you noted and it still shows "No Matches Found". I don't have the latest Map thats out, mine is last years. Is your map the latest? If not, I wonder why it would show on the Zumo and not the 660? Isn't that a Garmin Product?

I posted a list of NC State Parks this week and will have to note the coordinates when I get a chance to visit them. I'll make any corrections to the file as I see discrepancies. I did map the file on Google Earth and looked them up. Some did appear to be outside the park areas. The addresses I used were for park entrances and/or park offices so that may be where the different locations came from.

Any info on this problem would be appreciated.

Robert, yes, I do have the City Navigator v2008 on my Zumo, but on an existing address like that, I would think that the v8 maps would show it the as well.

It's interesting (ie strange) that yours doesn't find it. Maybe someone else with the v8 maps can try it and see what they come up with.

Fred, errors can occur when geocoding addresses particularly in rural areas. The data databases typically do not "know" exactly where the addresses are. Instead, the database has data that indicates that a certain street segment contains a certain range of addresses. Then it attempts to allocate where on the street those locations should fall. Sometimes it's accurate, sometimes it's not as accurate. Again, this is usually worse in rural areas, but for the most part, many of the addresses may not be "spot on" due to the way that they are dervived.

Here's how...

Did the Where to > Address > Spelled Texas > Search All > House # > 6750 > put in the street as CR-283...it came back with a select...I did CR-283 (N)...then it gave me a screen to select...and I picked the Kaufman, TX one. N32.63550 W96.35233

I've noticed in the GPSr and on the map sites that rural addresses can be very picky as to how they are entered. Sometimes with the dash sometimes without. Not to mention sometimes rural routes can go by multiple names.

The street 1 block north of my home shows up in Mapsource and on my 660 as 4th Ave S and the county designation 255th st, and, it's county road designation CR-B35 depending on point selected on the MapsSource map, and zoom level. It's quite odd...

Well, back from the country. Google Earth had the CR-283 right, but was off exactly,.....exactly, 1 mile. That's quite a miss for coordinates (I think). I don't know how close or far the other two may have missed. Oh well, I didn't get lost, that's the main thing. I have always heard a miss is as good as a mile. ) You all have a fine week-end.

Kch, I did it your way, and it came up (the address). But I couldn't put in Kaufman as the Spell City. Instead, I had to use Search All, and go from there. In the end, it denotes Terrell, TX as the City which is incorrect. The correct address is Kaufman, and the property is only about 3 miles out of Kaufman. It's more like 15 miles from Terrell. Doesn't matter anyway now, the property is sold, and my widowed sister-in-law is moving to Dallas. It was a going away, moving party. We had a good time anyway.

I have experienced that the GPSr is off by greater distances in the country vs the city. I think that the biggest miss was about 3/4 of a mile.

Hi MM,

I see that the databases aren't always accurate but I hope the ones I posted on the NC State Parks are close enough for me and anyone else following them to find the parks. If anyone finds an error on the coordinates I hope they will notify me so I can make changes to the POI file.

Thanks for the post.