# Re: [OpenMap Users] mapping layers, new shape layers.... I dont Y my questions are neglected.... Someone do reply

Date: Sat, 24 Sep 2005 16:54:27 -0500

Thanks a lot Don. That helps me.

kedar.

On 9/21/05, Don Dietrick <dietrick_at_bbn.com> wrote:
>
> Hi Kedar,
>
> On Sep 18, 2005, at 3:49 PM, kedar myadam wrote:
>
> >
> >
> > Hi,
> >
> > I posted my question(subject: "map exactly") couple of
> > days back and for some reason no one replied me, may b i should be
> > clear with my problem
> >
> > (Question: 1)
> >
> > I have a image and i added as a layer in Openmap. The
> > layer i created represents 1500 kms in width and 1500kms in height.
> > I place this at certain latitude and longitude. My Question is How
> > to map it exactly?? I mean the distance covered by layer on the map
> > should be 1500 kms, How could this be possible. For example the
> > distance between Longitudes at Equator is 110 kms( i guess) .
> > How can i map exactly if i have a image that represents 1500 kms
> > and i want to center the image at Lat,Lon(27,-80).
> >
> > The program output looks something like this,
> >
>
>
> How exact do you need to be? You run into the problem where the
> dimensions of the window affect the distance represented, and the
> choice of projection type affects that, too. I suppose you could
> configure the LamberConformalConic projection to fit the area you
> describe, that's an equidistant projection. You'll have to find the
> parameters of a state plane that works for that area of the earth.
> OpenMap doesn't have a UTM projection, or I'd suggest using that.
>
> But, in general for the other projections, you'd have to figure out
> the corner coordinates of a box that would cover the approximate size
> of the area you want. You can use the GreatCircle class to find a
> location from the center of your area to 750 km E/W/N/S. Then, you
> call the projection.getScale(...) method on your projection, with the
> center of your area being the center of the projection, and pass the
> coordinates of your box to that method. That will tell you the scale
> you need to set on your projection for that approximate area.
>
> >
> > (Question : 2)
> >
> > How can i add more Shape layers, where can i get it from? I want
> > something that looks more fancy. My professor was not impressed
> > by the "Political Boundaries" layer, he wants something more good
> > looking.
>
> There is a FAQ entry on the website for some options. You might want
> to try to find some background images or some DTED data, too.
>
> http://openmap.bbn.com/cgi-bin/faqw.py?req=all#9.16
>
> - Don
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Don Dietrick, dietrick_at_bbn.com
> BBN Technologies, Cambridge, MA
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>
>
>

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Received on Sat Sep 24 2005 - 17:59:17 EDT

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