Raster coordinate files

Raster picture coordinate information can be read from different types of coordinate files. When reading raster pictures, all three files are searched in that order.

The file has to be in the same directory as the actual picture and the name without extension must be same as the picture file’s.

Special setting CrdPath can be used to define some other directory for raster coordinate files.

CRD

The 3d-system CRD file is an ASCII format file, where one raster picture’s scaling information is given with the lower left and upper right corner coordinates.

You can make the CRD file in the 3D-Win program after you have read the raster picture.

Example:

6700000.000  2550000.000  6710000.000  2560000.000

TFW, JGW, PGW, WLD

First line of file is the pixel size in meters. Next three numbers are rotation parameters and last two numbers are coordinates of the center of the upper left pixel. This format is used by ESRI GIS-applications.

Example:

2.0
0.0
0.0
-2.0
2550001.000
6709999.000

TAB

In addition to the coordinates of the corner points, the file includes information about the picture and map projection. Format is used by MapInfo GIS-application.

Example:

Definition Table
File "map4.tif"
Type "Raster"
(1560050,6712769) (0,0) Label "Pt 1",
(1565650,6712769) (560,0) Label "Pt 2",
(1565650,6707169) (560,560) Label "Pt 3",
(1560050,6707169) (0,560) Label "Pt 4"
CoordSys Earth Projection 24,28,"m",21,0,1,1500000,0
Units "m"

ATT

Coordinate file used by finnish TietoSavo.

Example:

FORMAT      TIFF
SCALE       1000
UNIT        1000
ORIGIN      1566000.000 6709000.000
RESOLUTION  254.000
COLOUR      62

INI

Coordinates for lower and upper corner. Format is used in some road map CD:s.

Example:

[PICTUREINFORMATION]
LOWERLEFTCORNERX=6300000.000000
LOWERLEFTCORNERY=1275000.000000
UPPERRIGHTCORNERX=6325000.000000
UPPERRIGHTCORNERY=1300000.000000

ERS

Coordinate file used by ErMapper for ECW-pictures. ECW-picture coordinates can also be stored internally to picture.

DatasetHeader Begin
Version = "6.0"
Name = "Greyscale.ers"
LastUpdated = Mon Jul 19 01:31:19 GMT 1999
DataFile = "Greyscale.ecw"
DataSetType = Translated
DataType = Raster
ByteOrder = LSBFirst
CoordinateSpace Begin
    Datum = "NAD27"
    Projection = "NUTM11"
    CoordinateType = EN
    Rotation = 0:0:0.0
CoordinateSpace End
RasterInfo Begin
    CellType = Unsigned8BitInteger
    CellInfo Begin
        Xdimension = 10
        Ydimension = 10
    CellInfo End
    NrOfLines = 1500
    NrOfCellsPerLine = 1500
    RegistrationCoord Begin
        Eastings = 475900.90839250002
        Northings = 3628704.6741760001
    RegistrationCoord End
        NrOfBands = 1
        BandId Begin
            Value = "Pseudo"
        BandId End
        RegionInfo Begin
            Type = Polygon
            RegionName = "All"
            SubRegion = {
                0       0
                0       1500
                1500    1500
                1500    0
            }
        RegionInfo End
    RasterInfo End
DatasetHeader End