Re: Need accurate GPS receiver (to identify locations on third party maps)

From: Navaneet Kumar (navaneet_at_usa.net)
Date: 07/23/04 

Date: 23 Jul 2004 05:52:53 -0700

> If you're standing at the front door, and the front door is your
> reference feature, you won't be able to achieve 5m accuracy. Simply
> because that house will block most of the satellites.
>
> I'd say, use aerial maps. They have a distance-per-pixel relationship.
> Okay, you may not be able to identify the front door for every house
> because it may be masked by small roofs or trees.
>
> For which area do you plan this? Have you looked at the HighRes
> Terraserver aerial images? They are free.

I am the original poster.

I have already done some work with the TerraServer "urban areas" and
"aerial photos" maps. I try and use the "urban" photos first, but if
they are not available, I use the aerial photos.

I am able to draw the network if I know the lat/long of houses. I
guess one can figure out the lat/long via USAPhotoMap or something,
but it is not practical to identify individual houses by looking at
the photos. Especially when the streets/landmarks are not labelled.

One good thing about my problem is that I want to only identify
houses, that is, real addresses, accessible via roads. So there must
be other ways to identify them, GIS wise, if a GPS device would not
work.

Can I get accurate lat/long based on address? Online services that I
have looked at give me only the nearest interesection or something.

Nav

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