Assignment of the program

The program of formation of a map in a raster form is intended for creation of a full set of images fragments of maps of specified sizes by the chosen scale range in format PNG, JPEG.

The purpose of formation of rasters set is acceleration of displaying maps containing a plenty of objects (more than 1 000 000) in the WEB- applications.

Acceleration of displaying is achieved by a method of caching the image - displaying the area of a vector map is substituted for displaying area of preliminary constructed raster, that is cached on the client by means of WEB-browser.

For correct displaying the raster maps together with other data and for determining the coordinates of points the passport of a map in format XML is formed in the form of a file with XPS extension. Map prepared for display in a raster form, can be displayed on the client in the environment of WEB-browser together with dynamically changeable vector data synchronously transmitted from GIS WebServer of version 3.х and above. For this purpose the passport of raster (XPS) is included into the project of data.

Input data of the program are:

-vector map in format MAP, SIT, SXF,

-user maps in format SIT,

-files of projects MPT,

-matrixes of layers, heights, qualities,

-rasters.

Output data of the program are:

-raster maps in format PNG.

-file of the project in XML format with XPS extension.

Upon termination of process in the enclosed catalogue of a map … \Images\ the file of project («Project name.XPS») and constructed rasters are contained. File of the project contains filenames of constructed rasters, scales, binding and a number of other data. This file (XPS) is intended for opening the vector and raster maps and can be used by another WEB application, together with other spatial data.