I really dont work with GeoTiffs, but see this post...
gis.stackexchange.com/questions/35210/setting-projection-to-a-geotiff-file-when-its-shown-as-unknown.
You could probabaly reproject your tiff into whatever projection your GPS
points are using ArcMap, GDAL, Qgis.
sent from 'droid
On Jan 29, 2013 7:08 PM, "David Purdy" <[email protected]> wrote:
> 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]<[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*****
>
> *[image: signatureLogo]*****
>
> ****
>
>
>
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