Re: [Geotools-gt2-users] Generating Map for set of Lat/Long Points

[Natarajan, S. <se...@pi...>]

Hi Adrian,
I ran your tutorial code, and I am getting these and working fine. I was
wondering how to generate the map; I need to get some map Image file.
How can we do that?
Thanks,
Senthil

Start of the output for the tutorial: CreateAFeature.

The polygon is:             POLYGON ((7 7, 6 9, 6 11, 7 12, 9 11, 11 12,
13 11, 13 9, 11 7, 7 7))
Point feature type name is: pointfeature
Point feature type is:      DefaultFeatureType [name=3Dpointfeature ,
namespace=3Dhttp://www.opengis.net/gml , abstract=3Dfalse , ty
pes=3D(DefaultAttributeType [name=3Dthe_geom , type=3Dclass
com.vividsolutions.jts.geom.Point , nillable=3Dtrue, min=3D1, =
max=3D1],Default
AttributeType [name=3DCITYNAME , type=3Dclass java.lang.String ,
nillable=3Dtrue, min=3D1, max=3D1],DefaultAttributeType [name=3DCITYPOP =
,
 type=3Dclass java.lang.Double , nillable=3Dtrue, min=3D1, max=3D1],)]
The point Feature is:       Feature[ id=3Dfid-13dd332c:10c5ee1195a:-8000 =
,
the_geom=3DPOINT (14 14) , CITYNAME=3DHometown , CITYPOP=3D
200000.0 ]
The line Feature is:        Feature[ id=3Dfid-13dd332c:10c5ee1195a:-7fff =
,
the_geom=3DLINESTRING (5 5, 6 5, 6 6, 7 6, 7 7, 8 7, 8
8) , RIVERNAME=3DThe big fat greasy limpopo ]
The linearRing Feature is:  Feature[ id=3Dfid-13dd332c:10c5ee1195a:-7ffe =
,
the_geom=3DLINEARRING (7 7, 6 9, 6 11, 7 12, 9 11, 11 1
2, 13 11, 13 9, 11 7, 7 7) ]
The polygon Feature is:     Feature[ id=3Dfid-13dd332c:10c5ee1195a:-7ffd =
,
the_geom=3DPOLYGON ((7 7, 6 9, 6 11, 7 12, 9 11, 11 12,
 13 11, 13 9, 11 7, 7 7)) , MAXELEVATION=3D1654.0 , ISLANDNAME=3DGreen
Island ]

End of the tutorial output.



-----Original Message-----
From: Adrian Custer [mailto:ac...@gm...]=20
Sent: Tuesday, July 11, 2006 12:14 PM
To: Natarajan, Senthil
Cc: Geotools users list
Subject: RE: [Geotools-gt2-users] Generating Map for set of Lat/Long
Points

Hey,

You have the right idea. You use JTS classes to make the geometry
(through coordinates) and then the Geotools classes to make a CRS and
then you put them together to make a Feature.

I'm working on the tutorials you will want but don't have them yet. I'll
attach three pieces I have.
(1) mucks around with jts geometries
(2) makes a feature *without* a CRS
(3) makes a feature with a CRS
you should be able to sort through and figure things out. If not, you'll
have to wait for my tutorials.

cheers,
adrian



On Tue, 2006-07-11 at 11:50 -0400, Natarajan, Senthil wrote:
> Hi Adrian,
> Thanks for the info and I appreciate.
>=20
> Here is the more detail about the data. You are right those are UTM
> Projected points.
> UTM Grid Zone:	10S
> "UTM-X, m:"	560531
> "UTM-Y, m:"	4181786
> Datum:	1927 NAD
>=20
> What I want to do is, just to start with, I need to create a map for=20
> these points.
> X,Y
> 566469,4181502
> 567309,4177908
> 567306,4178221
> 563567,4182488
> 563601,4182221
> 560531,4181786
>=20
> I created a map manually using ArcGIS, by just opening the above
points
> saved in a .txt file. Please find the attached map file.=20
>=20
> I just want to do produce the same map programmatically by using some
> open source GIS API.
> Is it possible to do this by using JTS?
>=20
> Do I need to create some coordinate points like this........
> Coordinate ptc =3D new Coordinate(14.0d,14.0d);
>       =20
>         // Create an array and add the coordinates for a line
>         Coordinate[] lsc =3D new Coordinate[7];
>         lsc[0] =3D new Coordinate(5.0d,5.0d);
>         lsc[1] =3D new Coordinate(6.0d,5.0d);
>         lsc[2] =3D new Coordinate(6.0d,6.0d);
>         lsc[3] =3D new Coordinate(7.0d,6.0d);
>         lsc[4] =3D new Coordinate(7.0d,7.0d);
>         lsc[5] =3D new Coordinate(8.0d,7.0d);
>         lsc[6] =3D new Coordinate(8.0d,8.0d);
>=20
> I am new to this, it will be great if you could point out some classes
> which does this (i.e) by taking the above UTM coordinate points and
> produce the map like the one I attached.
>=20
> Thanks,
> Senthil
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: Adrian Custer [mailto:ac...@gm...]=20
> Sent: Monday, July 10, 2006 7:36 AM
> To: Natarajan, Senthil
> Cc: Geotools users list
> Subject: Re: [Geotools-gt2-users] Generating Map for set of Lat/Long
> Points
>=20
> Hello,
>=20
> This is a great first question. I wish we had a tutorial just to
answer
> this question and I hope to build one eventually. For now you are
going
> to have to work your way through some things on your own.
>=20
> First, your question is actually incomplete. We could easily generate
a
> data set with a point at each of those coordinates, as I will explain
> below. However, if you then expect to match these coordinates to other
> geographic data, you have to have slightly more information, namely
the
> projection system you are using. Your data do not seem to be
longitudes
> and latitudes but some other projected data; you will therefore need
to
> find out what projection they are using.
>=20
> If all you want to do is create a file of geometric points at those
> coordinates, then you are essentially going to be using the JTS
library
> since this is what Geotools uses. You could look on the JTS web site
or
> you could read the current documentation prototype at:
> http://docs.codehaus.org/display/GEOTDOC/Programmers+Manual+Prototype
> and checkout the tutorial file
>
http://docs.codehaus.org/download/attachments/50776/GnuGIS_Geotools_Tuto
> rial000010_Geometry010_Creation.java?version=3D1
>=20
> Note these are both prototypes, in early stages, and so are less
elegant
> than they could be but they should get you started. However, because
you
> are not using any projection information,
>   THIS WILL NOT GIVE YOU POINTS THAT YOU CAN MATCH TO OTHER DATA.
> You have been warned. To do that you will need to build projection
data
> and use both your geometry and the projection info to build a geotools
> feature. I'm hoping to write a tutorial about this shortly. Look
around
> at the web site for more info.
>=20
> It would be nice to have a helper function in Geotools to do this
simple
> operation and perhaps we can add that eventually.
>=20
> Good luck,
>=20
> sincerely,
> adrian custer
>=20
>=20
> On Sun, 2006-07-09 at 19:13 -0400, Natarajan, Senthil wrote:
> > Hi,
> >=20
> > I was wondering is it possible to generate a Map using GeoTools API
> > for a set of Lat/Long points.
> >=20
> > Basically I need to generate a Map for these Locations.
> >=20
> > X,           Y
> >=20
> > 566469,4181502
> >=20
> > 567309,4177908
> >=20
> > 567306,4178221
> >=20
> > 563567,4182488
> >=20
> > 563601,4182221
> >=20
> > 560531,4181786
> >=20
> > =20
> >=20
> > If it is possible could you point out some example code how to
> > generate the Map. If it is not possible could you please suggest
some
> > open source Java API which does this.
> >=20
> > =20
> >=20
> > Thanks,
> >=20
> > Senthil
> >=20
> >=20
> >
>
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>=20