Package org.openjump.core.ccordsys.utils

Class ProjUtils

java.lang.Object

org.openjump.core.ccordsys.utils.ProjUtils

public class ProjUtils
extends Object

Giuseppe Aruta [23_3_2016] This class is used to recognize file projection. There are different methods A) a method to decode projection information from GeoTIFF metadata. B) a method to decode projection info from auxiliary files (.proj and .aux.xml). http://landsathandbook.gsfc.nasa.gov/pdfs/geotiff_spec.pdf http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GeoTiff.html http://www.remotesensing.org/geotiff/spec/geotiff6.html the following datasets have been used to test this library: QGIS (http://qgis.org/downloads/data/) OSGEO data samples ( http://download.osgeo.org/geotiff/samples/)

Constructor Summary

Constructors

Constructor	Description
ProjUtils()

Method Summary

Modifier and Type	Method	Description
static SRSInfo	getSRSInfoFromAuxiliaryFile(String fileSourcePath)	- Read SRS from auxiliary file - Method to get a SRS (SRID code + SRID definition) scanning the aux projection file (AUX.XML or PRJ file) for a search string (SRID code or SRID definition).
static SRSInfo	getSRSInfoFromGeoTiff(String fileSourcePath)	- Read SRS from GeoTIFF tag - This method gets projection srid code and projection info from a geotiff file.
static SRSInfo	getSRSInfoFromLayerSource(Layer layer)	Method to get SRID from a layer file from auxiliary files (.prj or .aux) or GeoTIFFed tag.
static SRSInfo	getSRSInfoFromLayerSource(RasterImageLayer layer)
static SRSInfo	getSRSInfoFromLayerStyleOrSource(Layer layer)	Method to get SRID from a layer from Style or from auxiliary file.
static SRSInfo	getSRSInfoFromLayerStyleOrSource_old(Layer layer)	Method to get SRID from a layer from Style or from auxiliary file.
static boolean	isImageGeoTIFFLayer(Layer layer)
static String	readableFormatWKTCode(String WKT)	Method to show an OGC WKT string in a more readable style

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ProjUtils

public ProjUtils()

Method Detail

getSRSInfoFromGeoTiff

public static SRSInfo getSRSInfoFromGeoTiff(String fileSourcePath)
                                     throws IOException,
                                            TiffTags.TiffReadingException

- Read SRS from GeoTIFF tag - This method gets projection srid code and projection info from a geotiff file. It first scans GeoKeyDirectoryTag to get either geographic/geocentric (2048 - GeographicTypeGeoKey), projected (3072 - ProjectedCSTypeGeoKey) or vertical (4096 - VerticalCSTypeGeoKey) info. If no key ID is identified, it scans for GeoAsciiParamsTag projection definition. Last choice, it search for an auxiliary file

Parameters:

fileSourcePath - . eg. "c\documents\folder\image.tif"

Returns:

the projection srid as a string. eg "32632"

Throws:

IOException - if an IOException occurs

TiffTags.TiffReadingException

getSRSInfoFromAuxiliaryFile

public static SRSInfo getSRSInfoFromAuxiliaryFile(String fileSourcePath)
                                           throws URISyntaxException,
                                                  IOException

- Read SRS from auxiliary file - Method to get a SRS (SRID code + SRID definition) scanning the aux projection file (AUX.XML or PRJ file) for a search string (SRID code or SRID definition). It scans into the registry file (srid.txt) to find a correspondence between the search string and lines of the srid.txt. If the source string corresponds as substring to a line, it returns the complete line as string. For instance, search strings like "NAD83 UTM zone 10N" or "26910" both return "SRID:26910 - NAD83 UTM zone 10N".

Parameters:

fileSourcePath - auxiliary file path

Returns:

SRSInfo and Projection definition

Throws:

IOException - if an IOException occurs

URISyntaxException - if an URISyntaxException occurs

readableFormatWKTCode

public static String readableFormatWKTCode(String WKT)

Method to show an OGC WKT string in a more readable style

Parameters:

WKT - OGC WKT from auxiliary proj file

Returns:

Readable string

getSRSInfoFromLayerStyleOrSource

public static SRSInfo getSRSInfoFromLayerStyleOrSource(Layer layer)
                                                throws Exception

Method to get SRID from a layer from Style or from auxiliary file. It tries to check all possibilities: a) SRID is recorded from layer auxiliary file b) SRID is recorded from data source c) No SRID is available d) Layer SRID doesn't match auxilary file/datasource SRID

Parameters:

layer - a Layer

Returns:

the SRID srid associated to the Layer

Throws:

Exception - if an Exception occurs

getSRSInfoFromLayerStyleOrSource_old

public static SRSInfo getSRSInfoFromLayerStyleOrSource_old(Layer layer)
                                                    throws Exception

Method to get SRID from a layer from Style or from auxiliary file. First scans SRIDStyle, than auxiliary file or GeoTIFF tag. If SRID does not exist, it returns 0.

Parameters:

layer - a Layer

Returns:

the SRID associated to the Layer

Throws:

Exception - if an Exception occurs

getSRSInfoFromLayerSource

public static SRSInfo getSRSInfoFromLayerSource(Layer layer)
                                         throws Exception

Method to get SRID from a layer file from auxiliary files (.prj or .aux) or GeoTIFFed tag. If the auxiliary file SRID does not exist, it returns 0.

Parameters:

layer - a Layer

Returns:

the SRID associated to this Layer

Throws:

Exception - if an Exception occurs

isImageGeoTIFFLayer

public static boolean isImageGeoTIFFLayer(Layer layer)

getSRSInfoFromLayerSource

public static SRSInfo getSRSInfoFromLayerSource(RasterImageLayer layer)
                                         throws Exception,
                                                URISyntaxException

Throws:

Exception

URISyntaxException