MPTZ project

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The packed MPTZ project is an archive of spatial data containing a complex representation of the territory in the form of vector maps of different levels of detail, rasters (terrain images) in RSW format, matrixes of heights and matrixes of quality characteristics of the terrain, insets from the same data, the links to data from the GIS Server and from geoportals by various protocols.

All datasets are packed into one MPTZ file. Links to external data are saved as a packed INI file. Maps and classifiers are compressed 3-4 times in MAPZ or SITZ format, matrixes are compressed 3-5 times, rasters are compressed 3-10 times. Terrain images in RSW and matrixes in MTW and MTQ contain 4 levels of data presentation - the most detailed basic, generalized in 1/4 scale, generalized in 1/16 scale, generalized in 1/64 scale. When displaying, the level of data presentation that is closest to the display scale is selected.

Vector maps are packed together with classifiers, a tree of distribution of objects over the map area, multiscale objects (generalized contours for different display scales) and hash tables indexed for search of objects semantics, which provides high speed of display and data search.

The packed project can use the environment variable instead of the hostname in the name of the data opened from the GIS Server. The variable name must start with the string $gserv (for example, HOST#$gserv1#2047#ALIAS#data/noginsk.sitx). It allows to customize MPT/MPTZ projects of data (having replaced a server name with an environment variable) and if necessary to transfer into another network environment (for example, from a test platform onto production platform) without reconfiguring the addresses of the data being opened. When saving MPT/MPTZ projects, the server name is automatically replaced with an environment variable if it is set for the given server name.

  To form an MPTZ project, it is necessary to open the corresponding maps, rasters, matrixes, data from GIS Servers and geoportals. Then to make settings of a display order, visibility range, a palette and other properties. To write to MPTZ, select the File\Save As\Packaged Project menu item. If the open data has already been compressed (mapz, mtw, rsw), then the created project will have approximately the same size as the total amount of the source data.

Editing and exporting to other formats is not available for an MPTZ project. Speed of displaying the MPTZ project is about the same as the source uncompressed data. The speed of data exchange, packed into an MPTZ project, increases by 5 - 20 times, taking into account the decrease in the number of transferred files (for example, the source map can consist of several thousand files). The size of the MPTZ file and the number of sets in the project is not limited.

When saving and opening the projects of maps in MPT\MPTZ format, the currently specified contents of display for each project map is taken into account. Into a project file the records of XML format in the form of sections with the name [#xml#vclxNNN] have been added. It allows to form from one set of maps the projects of different composition of layers, scale, color design for use in the form of inserts in various reports and other tasks.

The virtual folder on the GIS Server can be supplemented/updated by MPTZ projects in a background mode, changing the area and detail of the background cartographic coverage and the composition of remote sensing data without additional data administration. Packaged MPTZ projects can be formed by region (as, for example, on Digital maps page) or according to nomenclature sheets (for example, at a scale of 1: 500 000), which allows you to quickly form a complex coverage of a given territory. The use of the MPTZ format allows you to optimize the system of storage, delivery and use of topographic and geodetic information in information systems for various purposes.