Sasa Milenkovic

Created new efficient and accurate algorithms for the transformation of geocentric to geodetic coordinates and vice-versa. Created new methods and algorithms for least-square adjustments of big data sets in different referential systems. Improved significantly widely-used Bursa-Wolf and Molodensky-Badekas models, introducing algebra and calculus with Hamilton's quaternions. Worked with complex matrix formulas and huge matrices containing hundreds of thousands of rows. User: Republic Geodetic Authority, Belgrade

A set of interrelated applications for mqtt-communication between devices, image overlaying on Win-XP embedded screen, text printing on a LED display, and Perl2C++ code migration.

User: CESYS GmbH, Germany.

A web application that enables the transformation of spatial coordinates and heights for the most commonly used systems in local geodetic practice. 3D coordinate transformation models. This was the official application for coordinate transformations in Serbia, widely used by a number of companies and institutions. User: Republic Geodetic Authority, Belgrade

A Qt widget for display and analysis of mathematical functions. It includes symbolic names, special implementation of inverse functions, simultaneous display of many functions and datasets, interactive plotting, and multi-prospect. It also includes analyses and visual comparisons of functions and datasets in a new and handy way.

Implemented algorithms for very large constrained optimization problems in power networks. New optimization algorithms. Created a library for handling sparse matrices that enables the handling of complex matrix formulas and huge matrix data containing millions of rows and columns. User: Intelligent Energy Systems Incorporated, USA

This is a back-end application for creating and editing sets of map cache data (both raster and vector formats).

I produced and maintained the so-called PETMS (Parallel Encrypted Tiled Map Service) cache with the possibility of srs-reprojecting.

I then designed and developed algorithms to increase performance and lower memory usage. I included data protection via encryption. I implemented the orthophoto-map of Serbia, approximately 4.5 terabytes of airborne images, i.e., complex coordinate transformations of approximately 7.5*10^12 pixels.

I also implemented maps of cadastral municipalities boundaries, approximately 3.5*10 six records in the database. It has excellent performance, suitable for big data.

User: Republic Geodetic Authority, Serbia

A web-based GIS of geodetic networks in Serbia. Designed and implemented an original technology (PETMS) for photo-map (ortho-photo) handling to improve quality, speed, and security. Geodetic transformations and re-projection of spatial coordinates, ISO metadata handling, queries, web services, etc. Client: Republic Geodetic Authority, Serbia.

Designed and developed an ISO metadata editor (ISO19139). Local extensions are introduced by the advanced xml-schema techniques. It has more than 2,500 downloads, so far! After using the editor, European Aeronautic Defense and Space Company (EADS-Astrium) asked the RGA (Republic Geodetic Authority) for obtaining the source code. The user was Republic Geodetic Authority, Serbia as a part of Twinning project with Kartverket, Norway.

Plug-in application for altering the behavior of the well-known "Scribus" application without any changes in its source code using Event Filters, DOM XML. The work was done in C++ and Qt for CESYS GmbH, Germany.

Coded various mathematical calculations regarding the gas springs characteristics and implementations with flexible I/O, print, email generator, wizard, and help with bilingual support in English and German. The work was done in Java. Users include CESYS GmbH, and Bansbach easylift GmbH, Deutschland.

Taw3 is a very specialized text processor with Unicode support, UTF-8 encoding/decoding, ruler, rich tab options, invisible characters. PF offers viewing and manipulations of raster and vector images (in pharmaceutical packaging) supporting a number of non-correlated local coordinate systems. Improved zooming using anti-aliasing algorithm. Used C++ and Borland Builder for DIT GmbH, Germany

Direct solver of algebraic equations of the fourth order. An extremely simple and efficient solver of an algebraic equation of the fourth order. The solution contains an algebraic improvement that simplifies things significantly. Numerical computing is reduced, and it performs extraordinarily.

This program creates a tile cache similar to the well-known GeoWebCache from an existing wms-source.

Moreover, it generates valid OSGeo TMS and OGC WMS services upon it. Finally, after executing it, there will be HTML sample files containing corresponding web maps, JavaScript code with OpenLayers 2 and 3, and ESRI JavaScript API. The intention was to illustrate, by samples, the simplicity of using and applying the resulting services.

Haskell solutions to the old mathematical puzzles (Max Bezzel, Berliener Schachzeitung, 1848). Demonstration of the power of Haskell, "Eight queens" and derived "Nine queens and one pawn" problems are efficiently solved.

A new approach to arithmetic expressions parsing. Fast, scalable, and applicable. No stack, no state machine, no Shunting-Yard, no anything in this algorithm! It can be used for many other tasks (building AST trees, post-order manipulations and RPN, graphs, etc), and it is very scalable and extensible. Superior performance compared to the industry standard, Dijkstra's Shunting-Yard algorithm.