WMS:Image Files

Image files are used in conjunction with TIFF files that have been previously imported to WMS and registered. They include the name of the TIFF file, the registration points, and the bounds of the clipping window. The format of the image file is shown in Figure 1 and a sample image file is shown in Figure 2.

Figure 1. The Image File Format

IMAGE	/*File type identifier */
TIFF “filename”	/* Indicates the name of the tiff file used */
IMREGPTS
PT1 u1 v1 x1 y1
PT2 u2 v2 x2 y2
PT3 u3 v3 x3 y3
CLIPPOINT
x1 x2
y1 y2

Figure 2. Sample Image File

IMAGE

TIFF "jonescyn.tif"

IMREGPTS

PT1 0 756 422424.030700 4519460.893988

PT2 0 0 422424.030700 4515391.182075

PT3 715 0 426273.322285 4515391.182075

CLIPPOINT

422424.030700 426273.322285

4515391.182075 4519460.893988

The card types used in the Image file format are as follows:

Card Type	IMAGE
Description	File type identifier. Must be on first line of file. No fields.
Required	YES

Card Type	TIFF
Description	Defines the name of the TIFF file to be displayed as an image.
Required	YES
Format	TIFF "filename"
Sample	TIFF "jonescyn.tif"
Field	Variable	Value	Description
1	filename	str	The name of the TIFF file.

Card Type	PT1, PT2, PT3
Description	The three registration points used to define locations on a given image.
Required	YES
Format	PT1 tx1 ty1 wx1 wy1 PT2 tx2 ty2 wx2 wy2 PT3 tx3 ty3 wx3 wy3
Sample	PT1 117 797 0.000000 10000.000000 PT2 117 88 0.000000 0.000000 PT3 1053 88 13220.0 0.000000
Field	Variable	Value	Description
1-2	tx ty	±	Texture map coordinates.
3-4	wx wy	±	World coordinates.

Card Type	CLIPPOINTS
Description	Defines the coordinates of the area in the TIFF file to be displayed as the image. (The area clipped and displayed from the TIFF file.)
Required	YES
Format	CLIPPOINTS xmin xmax ymin ymax
Sample	CLIPPOINTS -628.990382 14338.471657 -857.665608 8354.617436
Field	Variable	Value	Description
1-2	xmin xmax	±	Min and max values in the x direction.
3-4	ymin ymax	±	Min and max values in the y direction.

Related Topics

• WMS Images