This is all that is in the tfw file:
0.0010810811
0.000000
0.000000
-0.0010810811
-77.2211469937
45.9782777361
How would I know if the tiff is projected?
From: [email protected] [mailto:[email protected]]
Sent: Sunday, January 27, 2013 12:56 AM
To: David Purdy; 'Brian Behling'
Cc: geotools-gt2-users
Subject: Re: [Geotools-gt2-users] Coordinate Reference System is not available
issue...
Hi, can you open the tfw file with text editor, maybe tiff is projected?
Then you will have to specify( reproject) coordinates of points.
--
Oleksandr Huziy
Sent from my HTC
----- Reply message -----
From: "David Purdy" <[email protected]>
To: "'Brian Behling'" <[email protected]>
Cc: <[email protected]>
Subject: [Geotools-gt2-users] Coordinate Reference System is not available
issue...
Date: Sat, Jan 26, 2013 8:53 PM
If projection information is only found in a .prj file then my GeoTiff image
does not have it. How do I go about getting that info?
Also, I am not sure what you mean by "GPS points are not projected but are in a
geographic coordinate system such as WGS84"?
I am basically doing the following to plot each point onto the map:
final SimpleFeatureType point = createFeatureTypePoint();
final SimpleFeatureBuilder BLDR = new SimpleFeatureBuilder(point);
Coordinate coord = new Coordinate(gpsData.getLongitude().doubleValue(),
gpsData.getLatitude().doubleValue());
pointCollection.add(createPoint(BLDR, coord, getPointId()));
That createPoint method just uses GeometryFactory to create the point.
Thanks,
Dave
From: Brian Behling [mailto:[email protected]]
Sent: Saturday, January 26, 2013 7:34 PM
To: David Purdy
Cc: [email protected]
Subject: Re: [Geotools-gt2-users] Coordinate Reference System is not available
issue...
Does yur GeoTiff image have projection information? I think it may need a .prj
file.
Typically GPS points are not projected but are in a geographic coordinate
system such as WGS84.
sent from 'droid
On Jan 26, 2013 4:49 PM, "David Purdy" <[email protected]> wrote:
Hi All,
I am working on an application that plots points from a GPS and has many other
features.
My issue is that the points being plotted on the chart seems to be off by a
fairly decent amount. I would say somewhere in the order of 20 miles south or
so from the actual GPS coordinates. I do notice that I am getting a warning
displayed during reading of the TIFF image for the chart. The warning is:
"WARNING: Coordinate Reference is not available". Is this warning the reason
my plotted points are off from where they should be displayed? Or would that
be because of some other reason? I don't see anywhere to define the coordinate
reference system. I have poured over all of your tutorials to see if I am
missing something. In this case, I am reading in 13001_3.tif and I also have a
file named 13001_3.tfw in the same directory where I am reading from. Below is
the code I have for reading the *.tif file:
map = new MapContent();
File rasterFile = new File(geoTiffFilesDir + "/" + selectedMapFile);
String rasterFilePath = rasterFile.getPath();
rasterFilePath = rasterFilePath.replace('\\', '/');
AbstractGridFormat format = GridFormatFinder.findFormat( rasterFile );
AbstractGridCoverage2DReader reader = format.getReader(rasterFile);
StyleBuilder styleBuilder = new StyleBuilder();
RasterSymbolizer rastSymbolizer = styleBuilder.createRasterSymbolizer();
Style style = styleBuilder.createStyle(rastSymbolizer);
GridReaderLayer rasterLayer = new GridReaderLayer(reader, style);
map.layers().add(layerIndex, rasterLayer);
I appreciate any help!!
Thanks,
Dave
--------------------------------------------
David Purdy
Owner/President
JJM Technologies Corporation
Email: [email protected]
Phone: 508.972.1266
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