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- bounding-coordinates-for-an-arbitrary-city
- 03-16-2008
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I'm trying to download map data from openstreetmaps.org and am having
some difficulty getting the appropriate minimum / maximum longitude /
latitude.
According to wikipedia.org, the latitude / longitude coordinates for
Austin, TX are 30.266667 and -97.75, so I tried the following:
Max Lat: 30.3
Min Lat: 30.2
Max Lon:-97.7
Min Lon:-97.8
Although that certainly captures some parts of Austin, TX, there's a
lot it doesn't capture. I could try expanding the ranges, but that'd
be guess work. I could expand them into the wrong direction or not
expand them enough.
I'm confident that Austin, TX's city limits are not in the shape of a
rectangle, but I'd be content with any rectangle that contained that
shape, so long as the extra data it contained was kept to a minimum
(the program I'm using - BSGPS - only lets you download data in the
shape of a rectangle).
If there was a way to get the GPS coordinates of the corners of the
polygon that represents Austin, TX's city limits, I could just chose
the maximum longitude from the list, the minimum longitude, etc, and
use those coordinates to download the data, but I don't even know how
to do that.
Any ideas?
> Any ideas?
If you have a reasonably good idea of how much of Austin you're
interested in, Google Earth (turn on the streets layer) should provide
adequate coordinates.
If you have access to Streets & Trips it should be fairly easy to do by
using the location sensor tool.
> I'm trying to download map data from openstreetmaps.org and am having
> some difficulty getting the appropriate minimum / maximum longitude /
> latitude.
>
> According to wikipedia.org, the latitude / longitude coordinates for
> Austin, TX are 30.266667 and -97.75, so I tried the following:
>
> Max Lat: 30.3
> Min Lat: 30.2
>
> Max Lon:-97.7
> Min Lon:-97.8
>
> Although that certainly captures some parts of Austin, TX, there's a
> lot it doesn't capture. I could try expanding the ranges, but that'd
> be guess work. I could expand them into the wrong direction or not
> expand them enough.
>
> I'm confident that Austin, TX's city limits are not in the shape of a
> rectangle, but I'd be content with any rectangle that contained that
> shape, so long as the extra data it contained was kept to a minimum
> (the program I'm using - BSGPS - only lets you download data in the
> shape of a rectangle).
>
> If there was a way to get the GPS coordinates of the corners of the
> polygon that represents Austin, TX's city limits, I could just chose
> the maximum longitude from the list, the minimum longitude, etc, and
> use those coordinates to download the data, but I don't even know how
> to do that.
>
> Any ideas?
> some difficulty getting the appropriate minimum / maximum longitude /
> latitude.
>
> According to wikipedia.org, the latitude / longitude coordinates for
> Austin, TX are 30.266667 and -97.75, so I tried the following:
>
> Max Lat: 30.3
> Min Lat: 30.2
>
> Max Lon:-97.7
> Min Lon:-97.8
>
> Although that certainly captures some parts of Austin, TX, there's a
> lot it doesn't capture. I could try expanding the ranges, but that'd
> be guess work. I could expand them into the wrong direction or not
> expand them enough.
>
> I'm confident that Austin, TX's city limits are not in the shape of a
> rectangle, but I'd be content with any rectangle that contained that
> shape, so long as the extra data it contained was kept to a minimum
> (the program I'm using - BSGPS - only lets you download data in the
> shape of a rectangle).
>
> If there was a way to get the GPS coordinates of the corners of the
> polygon that represents Austin, TX's city limits, I could just chose
> the maximum longitude from the list, the minimum longitude, etc, and
> use those coordinates to download the data, but I don't even know how
> to do that.
>
> Any ideas?
You can get coordinates of anyplace in the world at mapper.acme.com.
It's more like:
Max Lat: 30.5
Min Lat: 30.0
Max Lon:-97.5
Min Lon:-97.9
yawnmoth wrote:
>
> I'm trying to download map data from openstreetmaps.org and am having
> some difficulty getting the appropriate minimum / maximum longitude /
> latitude.
>
> According to wikipedia.org, the latitude / longitude coordinates for
> Austin, TX are 30.266667 and -97.75, so I tried the following:
>
> Max Lat: 30.3
> Min Lat: 30.2
>
> Max Lon:-97.7
> Min Lon:-97.8
>
> Although that certainly captures some parts of Austin, TX, there's a
> lot it doesn't capture. I could try expanding the ranges, but that'd
> be guess work. I could expand them into the wrong direction or not
> expand them enough.
>
> I'm confident that Austin, TX's city limits are not in the shape of a
> rectangle, but I'd be content with any rectangle that contained that
> shape, so long as the extra data it contained was kept to a minimum
> (the program I'm using - BSGPS - only lets you download data in the
> shape of a rectangle).
>
> If there was a way to get the GPS coordinates of the corners of the
> polygon that represents Austin, TX's city limits, I could just chose
> the maximum longitude from the list, the minimum longitude, etc, and
> use those coordinates to download the data, but I don't even know how
> to do that.
>
> Any ideas?
> I'm trying to download map data from openstreetmaps.org and am having
> some difficulty getting the appropriate minimum / maximum longitude /
> latitude.
>
> According to wikipedia.org, the latitude / longitude coordinates for
> Austin, TX are 30.266667 and -97.75, so I tried the following:
>
> Max Lat: 30.3
> Min Lat: 30.2
>
> Max Lon:-97.7
> Min Lon:-97.8
>
> Although that certainly captures some parts of Austin, TX, there's a
> lot it doesn't capture. I could try expanding the ranges, but that'd
> be guess work. I could expand them into the wrong direction or not
> expand them enough.
>
> I'm confident that Austin, TX's city limits are not in the shape of a
> rectangle, but I'd be content with any rectangle that contained that
> shape, so long as the extra data it contained was kept to a minimum
> (the program I'm using - BSGPS - only lets you download data in the
> shape of a rectangle).
>
> If there was a way to get the GPS coordinates of the corners of the
> polygon that represents Austin, TX's city limits, I could just chose
> the maximum longitude from the list, the minimum longitude, etc, and
> use those coordinates to download the data, but I don't even know how
> to do that.
>
> Any ideas?
--
Jack
Get general GPS information at: http://www.gpsinformation.net/
