MapInfo Spatial Server Map Tiling Service - Product Documentation ...

VirtualPixelCoordinate
Field Name
column
Example
{
}
"row": 1,
"column": 8
VirtualPixelCoordinate
44
Type
Integer
Description
The column number of the map tile. Column numbering
starts at the top, at number 1.
A VirtualPixelCoordinate object contains the x and y coordinates of a pixel in the virtual pixel space of
the entire map image.
Note: Do not confuse coordinates in the virtual pixel space of the entire map image with normal screen
pixel coordinates. Normal screen pixel coordinates always start with (0, 0) at the top left corner
of the screen, regardless of what section of the entire map image is currently displayed in the
screen. In contrast, the virtual pixel space of the map image is constant at any particular zoom
level, regardless of what part of the map is currently displayed in the screen. So, for example, if
a map image is set to zoom level 3, the map image is composed of 4 tiles across and 4 tiles
down. If each tile has dimensions of 512 by 256 pixels, then the dimensions of the entire map
image are 2048 by 1024 pixels. This is referred to as the virtual pixel space of the map image,
because only a subsection of the entire image may be displayed in the screen at any one time.
When a VirtualPixelCoordinate object is returned in an EnvinsaResponse JSON object, the VirtualPixel-
Coordinate object is always located in a JSON field named virtualPixelCoord.
Fields
A VirtualPixelCoordinate object contains the following fields:
Field Name
virtualX
virtualY
Example
{
}
"virtualX": 256,
"virtualY": 300
Type
Integer
Integer
Description
The x coordinate of the virtual pixel. The x coordinate
numbering starts at the left edge of the left-most
tile of the map image, at number 0.
The y coordinate of the virtual pixel. The y coordinate
numbering starts at the top edge of the top-most
tile of the map image, at number 0.
MapInfo Spatial Server 1.0