simple tool for conversion

[Ed McNierney]

Joseph -

Sorry, but I don't know what fGIS is, so I'll be a little vague, but if
you're using multiple data sources in different projections then you
need to (a) be using software that can handle layers in different
projections and (b) accurately describe what projection each of your
layers is using.

If you can't do that, then you will need to reproject your lat/lon data,
but if that's the case it's a limitation of the software or the user,
not a limitation of shapefiles.

        - Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242  

-----Original Message-----
From: Joseph Norris [mailto:sirronj at pacbell.net] 
Sent: Wednesday, December 08, 2004 11:54 AM
To: Ed McNierney; MAPSERVER-USERS at lists.umn.edu
Subject: RE: [UMN_MAPSERVER-USERS] simple tool for conversion

Well - here is my experience:

I did just that - wrote a script that built a shapefile using the
lat/long coordiance.  My shape file looked like this on a dump:

File Bounds: (      32.586,    -124.206,0,0)
         to  (      41.773,     -89.769,0,0)

Shape:0 (Point)  nVertices=1, nParts=0
  Bounds:(      38.526,    -121.507, 0, 0)
      to (      38.526,    -121.507, 0, 0)
     (      38.526,    -121.507, 0, 0)

Shape:1 (Point)  nVertices=1, nParts=0
  Bounds:(      37.775,    -122.451, 0, 0)
      to (      37.775,    -122.451, 0, 0)
     (      37.775,    -122.451, 0, 0)


Then I went and used fGIS and plotted some points on a layer over my
California map and I got the following:


File Bounds: ( 6471392.899,  282843.628,0,0)
         to  ( 8433025.828, 2304680.124,0,0)

Shape:0 (Point)  nVertices=1, nParts=0
  Bounds:( 7750718.722, 1391592.674, 0, 0)
      to ( 7750718.722, 1391592.674, 0, 0)
     ( 7750718.722, 1391592.674, 0, 0)

Shape:1 (Point)  nVertices=1, nParts=0
  Bounds:( 6471392.899, 2304680.124, 0, 0)
      to ( 6471392.899, 2304680.124, 0, 0)
     ( 6471392.899, 2304680.124, 0, 0)

Shape:2 (Point)  nVertices=1, nParts=0
  Bounds:( 8433025.828,  282843.628, 0, 0)
      to ( 8433025.828,  282843.628, 0, 0)
     ( 8433025.828,  282843.628, 0, 0)

There is a big difference which led me to believe that I needed to
convert lat/long to x/y coordinates.


#Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map
chr
$_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,
14,-
68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at lists.umn.edu]On
Behalf Of Ed McNierney
Sent: Wednesday, December 08, 2004 8:46 AM
To: MAPSERVER-USERS at lists.umn.edu
Subject: Re: [UMN_MAPSERVER-USERS] simple tool for conversion

Joseph -

You should realize that there's nothing wrong with putting lat/lon
coordinates in a shapefile.  You seem to think that some "conversion" is
necessary, and it's not.  The world is full of shapefiles with lat/lon
coordinates in them.

        - Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Joseph Norris
Sent: Wednesday, December 08, 2004 11:37 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] simple tool for conversion

Yes that is what I am trying to do.  I have the latitude and longitude
for different Mysql database records and I wish to produce a point shape
file of these coordinates.


#Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map
chr
$_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,
14,-
68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);

-----Original Message-----
From: Ethan Alpert [mailto:ealpert at digitalglobe.com]
Sent: Wednesday, December 08, 2004 8:28 AM
To: Joseph Norris; MAPSERVER-USERS at lists.umn.edu
Subject: RE: [UMN_MAPSERVER-USERS] simple tool for conversion


This makes no sense to me what-so-ever what are you trying to do? Take
vertices in a text file and build a shapefile? Project lat/lon values
into California State Plane?

-e

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at lists.umn.edu] On
Behalf Of Joseph Norris
Sent: Wednesday, December 08, 2004 7:58 AM
To: MAPSERVER-USERS at lists.umn.edu
Subject: [UMN_MAPSERVER-USERS] simple tool for conversion


Can anyone make a recommendation for unix command line tool that will
convert lat/long to xy coordinates?

Thanks.

#Joseph Norris (Perl - what else is there?/Linux/CGI/Mysql) print @c=map
chr
$_+100,(6,17,15,16,-68,-3,10,11,16,4,1,14,-68,12,1,14,8,-68,4,-3,-1,7,1,
14,-
68,-26,11,15,1,12,4,-68,-22,11,14,14,5,15,-90);