RE: [OpenMap Users] shapefile checking bounds

From: Ben Podoll <benjamin.podoll_at_und.edu>
Date: Wed, 4 Aug 2004 18:54:06 -0500

Which way is better? (more efficient)

> -----Original Message-----
> From: Chapman, Martin [mailto:MChapman_at_sanz.com]
> Sent: Wednesday, August 04, 2004 6:48 PM
> To: Hudson Brian R Contr AFRL/IFSF; Ben Podoll; openmap-users_at_bbn.com
> Subject: RE: [OpenMap Users] shapefile checking bounds
>
> Brian,
> Another way to do it is like so, which can handle any shape as an AOI,
> such as a circle:
>
> // esriPolygon is your extents or AOI (area of Interest), or your view
> extents
> // m_list is your list of OMGraphics that you read in from your
> shapefile
> // basically, it loops through each shapefile feature and does a true
> geometry intersection and returns a new OMGraphicList of shapes that
> //intersect your AOI.
>
> Shape p = esriPolygon.getShape();
> OMGraphicList list = filter(esriPolygon.getShape(), oProjection);
>
> public OMGraphicList filter(GeneralPath path, Projection projection)
> throws Exception
> {
> try
> {
> if (m_list == null)
> return new OMGraphicList();
>
> OMGraphicList list = new OMGraphicList();
>
> Iterator it = m_list.iterator();
>
> while (it.hasNext())
> {
> OMGraphic graphic = (OMGraphic) it.next();
> boolean b = graphic.generate(projection);
> Rectangle2D rect = graphic.getShape().getBounds2D();
> boolean intersects = path.intersects(rect);
>
> if (intersects)
> list.add(graphic);
> }
>
> return list;
> }
> catch(Exception e)
> {
> throw e;
> }
> }
>
> Martin Chapman
>
> -----Original Message-----
> From: Hudson Brian R Contr AFRL/IFSF [mailto:Brian.Hudson_at_rl.af.mil]
> Sent: Wednesday, August 04, 2004 4:26 PM
> To: Ben Podoll; openmap-users_at_bbn.com
> Subject: RE: [OpenMap Users] shapefile checking bounds
>
>
> Hey,
>
> If you have a spatial index file along with the shp file it should be
> pretty easy.
>
> You can just use the locateRecords function of the SpatialIndex class.
>
> For an example, take a look at the ShapeLayer.
>
> Brian Hudson
>
> -----Original Message-----
> From: owner-openmap-users_at_bbn.com [mailto:owner-openmap-users_at_bbn.com]
> On Behalf Of Ben Podoll
> Sent: Wednesday, August 04, 2004 5:49 PM
> To: openmap-users_at_bbn.com
> Cc: 'Don Dietrick'
> Subject: [OpenMap Users] shapefile checking bounds
>
>
> My problem is fairly complex but somewhat straightforward.
>
> I have a shapefile of National Weather Service warnings and watches.
>
> I want to be able to take the extents that the OpenMap is viewing (i.e.
> the 4 lat/lon corners) and check if any /shape/ in the shapefile
> intersects. Or in other words is within their viewing area (or at least
> a piece of one)?
>
> Is there any good way anyone knows of to do this?
>
> Ben
>
>
> --
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Received on Wed Aug 04 2004 - 19:54:47 EDT

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