wrong address

 

I purchased a refurbished 2460LMT GPS and in the process of setting it up/gettinf use to it, I notice that while setting in front of my house and pressing "where am I" it gives the wrong house address. I am parked in front of 4113 & it shows 4177. Is there a way to correct this?

Addresses

This is common. One way to get around this is to create a Home location, then use Home rather than an address for routing purposes.

Here's more than you ever wanted to know about this situation. See:

http://en.wikipedia.org/wiki/Geocoding

especially the section titled "Complicating Factors:"

Finally, several caveats on using interpolation:

The typical attribution of a street segment assumes that all "even" numbered parcels are on one side of the segment, and all "odd" numbered parcels are on the other. This is often not true in real life.

Interpolation assumes that the given parcels are evenly distributed along the length of the segment. This is almost never true in real life; it is not uncommon for a geocoded address to be off by several thousand feet.

Segment Information (esp. from sources such as TIGER) includes a maximum upper bound for addresses and is interpolated as though the full address range is used. For example, a segment (block) might have a listed range of 100-199, but the last address at the end of the block is 110. In this case, address 110 would be geocoded to 10% of the distance down the segment rather than near the end.

Most interpolation implementations will produce a point as their resulting "address" location. In reality, the physical address is distributed along the length of the segment, i.e. consider geocoding the address of a shopping mall - the physical lot may run quite some distance along the street segment (or could be thought of as a two-dimensional space-filling polygon which may front on several different streets - or worse, for cities with multi-level streets, a three-dimensional shape that meets different streets at several different levels) but the interpolation treats it as a singularity.

If you like tables and graphs, this might even be more helpful:

http://www.ij-healthgeographics.com/content/2/1/10

Click Figures 3, 4, 5 in the above link for detailed visuals.

Geocoding

Intersting references. Thanks

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nuvi 855. Life is not fair. I don't care who told you it is.

Wrong location

On Thanksgiving day I navigated to an address in Eureka, IL. Even though the house number is 300, Garmin sent me to the other end of the block. BTW, not one house number displayed on any of the houses on that block.
A U-turn and we arrived for dinner.

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1490LMT 1450LMT 295w

Interpolation

This is a problem not only with GPS maps but also with Google maps. Just being aware of it may be enough in most cases.

If a certain location is important, do not use the address. Just geocode it with Google Earth if it can be seen or go there with the GPS to get the coordinates. Many members who maintain the POI files are constantly dealing with this issue.

dobs108 smile

Just get me close

I always assume my GPS will get me close and not necessarily stop by right in front of the correct house/business.

Mine...

jwillum wrote:

I always assume my GPS will get me close and not necessarily stop by right in front of the correct house/business.

Mine gets me to the Burger King down the street from my house. I think I know how to get home from there.

good example

My block is a good real life example of what CraigW posted. My block numbers from east to west with the highest number being 1958, but all of the mapping software numbers it to 1972, so my address shows about two or three houses east of where I actually live.

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Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.

Same Problem

I have the same problem with my house due to interpolation and my in-law's house also shows up on the wrong side of the street.

here's one that's even more fun

DiQuest wrote:

I have the same problem with my house due to interpolation and my in-law's house also shows up on the wrong side of the street.

I live on a large circular street so as you drive around the circle, the house numbers on both the right and left will change from odd to even. I haven't seen an algorithm that can take that into account correctly as f yet.

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ɐ‾nsǝɹ Just one click away from the end of the Internet

Another Oddity

I played with mapping and GIS programs for many years before getting a GPS, so I'm quite familiar with TIGER files and address range interpolation.

a_user wrote:

I live on a large circular street so as you drive around the circle, the house numbers on both the right and left will change from odd to even.

I live on a main road, and my house number is 159. My next door neighbor is 163. About a dozen years ago, a developer put in a cul de sac with several town houses, down next to #149 - the Post Office gave him #161 for the address (161A, 161B, etc.) I've lost track of the number of taxi cabs, UPS drivers, and even police officers that I've had to direct to the appropriate place to find #161...

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The Moose Is Loose! nuvi 760

The street numbers are only

The street numbers are only approximate in the mapping software. I always put exact coordinates once I've gone to that location once, so that the future navigation is quite exact.

Fred

this is great espscially for

this is great espscially for huge outdoor malls where the address is basically just the lot, but the store you like might be hidden far off to the end

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A GPS can take you where You want to go but never where you WANT to be.

@jwinville

jwinfville wrote:

I purchased a refurbished 2460LMT GPS and in the process of setting it up/gettinf use to it, I notice that while setting in front of my house and pressing "where am I" it gives the wrong house address. I am parked in front of 4113 & it shows 4177. Is there a way to correct this?

Just wondering, what do you mean by "correct"? Where would it be corrected?

I Like To Save The Location To Favorites If I Know I'll Be Back

FZbar wrote:

The street numbers are only approximate in the mapping software. I always put exact coordinates once I've gone to that location once, so that the future navigation is quite exact.

Fred

Then I can let anyone in the family use the GPS to get right where they need to be. I think I'm the only one with the "just get me close and I'll find it" attitude.

My 255w

Stills shows a right than a left on the map, but Karen tells me to make a left than a right. Even after several map upgrades.

No House Numbers

spokybob wrote:

BTW, not one house number displayed on any of the houses on that block.

Not helpful in the event FD or PD are trying to respond to a 911 call.

Addrees Not Displayed

perpster wrote:
spokybob wrote:

BTW, not one house number displayed on any of the houses on that block.

Not helpful in the event FD or PD are trying to respond to a 911 call.

I totally agree, far too many homes and even businesses don't display an address. The Post Office should not deliver mail if an address is not displayed, this perhaps will motivate owners.

This could potentially be a life saver by saving valuable time in case of medical emergencies where sometimes seconds could mean life or death.

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Nuvi 2460LMT 2 Units

Wrong Side of Street

There is an Antique Store in Ashville NC we frequent when we go to our property, that always reports to be on "Right Side" of street, when it actually is on the Left Side of the street.
(Tobacco Barn)

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A 2689LMT in both our cars that we love... and a Nuvi 660 with Lifetime Maps that we have had literally forever.... And a 2011 Ford Escape with Nav System that is totally ignored!

long standing mapping issue

as others have noted, this is a long standing mapping issue, not just a Garmin issue. Assignment of street numbers is not reliable. Given the tools today, if it is not POI (which is sourced by lat/lon), and it is important, then I look it up with a visual satellite picture before embarking.

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___________________ Garmin 2455, 855, Oregon 550t