Thanks, Sara.

For your first question:

Geographic Coordinate System: GCS_North_American_1983_HARN

Projected Coordinate System:
NAD_1983_HARN_StatePlane_Oregon_North_FIPS_3601_Feet_Intl

I have imported the shp file in R by read.shaplefiles().

For your second question:
1) by relative long and lat, I mean distances to the city center from
south-north and east-west directions.
2) I know the coordinate of the reference point.

Thanks.

Best
Gary


On Wed, Jul 18, 2012 at 11:30 AM, Sarah Goslee <sarah.goslee@gmail.com>wrote:

> Hi,
>
> On Wed, Jul 18, 2012 at 2:11 PM, Gary Dong <pdxgary163@gmail.com> wrote:
> > Dear R users,
> >
> > I have a city map in shape file (polygon). I also have some points that I
> > hope to plot them to the city map.
>
> What projection is the shape file in? Have you successfully imported
> it into R yet?
>
> This page has a nice overview on dealing with shapefiles in R.
>
> http://www.nceas.ucsb.edu/scicomp/usecases/ReadWriteESRIShapeFiles
>
>
> > The only information I have about those
> > points are their relative longitude and latitude to the city center by
> > miles. Is there a way that R can help me to do this? Thanks.
>
> What does "relative longitude and latitude in miles" mean? That makes
> no sense to me. Do you mean distance and direction? (Which wouldn't be
> latitude and longitude.)
>
> If the latter, do you know the coordinates of the reference point?
>
> I think we need more information to be able to help. You might also be
> better served by asking on the r-sig-geo list instead of the main
> R-help list.
>
> Sarah
>
> --
> Sarah Goslee
> http://www.functionaldiversity.org
>

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