Mapping of species has been an important part of all recent biogeographical researches. Data of flora and fauna monitoring includes very important information. Flora and fauna species are indicators of environmental conditions; therefore, they help to predict changes of environment and make correct decisions for territorial planners. It leads to the fact that species mapping projects are carried out more widely and their scientific results are practical. Mapping of species in Latvia could be divided into 3 periods. The first period lasted from 50ies till the end of 60ies of the 20th century. Maps, created in the first period, were at a small scale. Localities were not strictly defined, their geographical precision was rough. The second period lasted till the end of the 20th century. It was a grid system that was based on topographical maps (scale 1: 25 000), developed by the General Staff of the USSR Ministry of Defence. Each grid cell in this grid system was 70.7 km2 (7.6 x 9.3 km) large. Nowadays a 5-level hierarchic grid system is used, based on the Latvian topographic map system TKS-93 developed in 1993. The grid contains five subordinate (hierarchical) levels (sub-grids): 10 x 10 km, 5 x 5 km, 1 x 1 km, 0.5 x 0.5 km, and 0.1 x 0.1 km. All grid levels interact with each other, thus allowing the analysis of distribution of species at different scales. As a result, it is possible to better understand regularities of species spatial location. A large number of cartographical materials, gathered in atlases, were prepared by using a biogegraphical mapping grid system. One of them is the Atlas of Flora of Lake Engure Nature Park (in the grid of 0.5 x 0.5 km), which consist of 876 distribution maps for vascular plants. Special algorithm for linking up data captured from the earlier used grid systems has been produced for preparing maps of atlas. One of the most voluminous distribution maps, produced with a biogeographical grid net system, is the Atlas of Latvian woody plants, which consists of 1482 woody plant distribution maps. Within the project, all possible information about woody plant localities distribution has been combined in one GIS-based database, which serves as part of information system of the Latvian dendroflora. Atlas of the Latvian woody plants is published in two different ways: as a printed book (606 pages) and as a web-based interactive map – GIS database.