An increased demand for energy in the World, as well as gradually more strict regulations in environmental protection have resulted in a more extensive usage of wind power and an increase in construction of energy plants that use wind to generate electricity. Construction of wind power plants is a complex process that lasts for years and includes many tasks like planning and implementing various analyses. One of the key analyses in the process of constructing a wind power plant is the analysis of wind estimation that is used to determine the amount of wind on a location and the profitability of the construction. The process of wind power estimation is also a complex process that includes many actions and the simulations performed based on meteorological and topographic parameters (altitude, roughness and obstacles) may be conducted in various physical models, like the widely known linear BZ model used by the WAsP program, as well as the increasingly used CFD models. This research applies the WAsP program in the area of the existing wind power plant “Danilo” near Šibenik, Croatia to determine the degree of influence of topographic parameters on wind estimation. The used timescale of meteorological data is December 1, 2015 to December 1, 2016, during which there were no errors on the measuring mast. Most of the research focuses on altitude data that approximate the real relief around the wind power plant. They have been extracted from 6 different global DEMs, topographic maps scaled 1:25.000 and Digital model of altitudes by the National geodetic administration of the Republic of Croatia. The contour lines singled out from these sources have been organized info 4 categories with different equidistances – 2.5, 5, 10 and 20 meters. The simulations have been conducted within the researched area with a radius of 5, 10, 15 and 20 kilometers around each turbine of the “Danilo” wind power plant. Through the testing of various areas and altitude data a total of 136 combinations have been acquired. It has been confirmed that the estimated average power generation is lower than the real power generation by 12 to 15%, depending on the source of altitude data. The most precise estimation was based on EUDEM model, while the estimation with the highest deviation was the one based on topographic map. It has been found that within the tested areas the best estimation is made for the area within the 10-kilometer radius around the wind power plant. Through combining the models with higher and lower resolution it has been determined that the models with higher resolution provide better estimations. Furthermore, in the research of contour line equidistances it has been determined that the contour lines with an equidistance of 20 meters give the best estimate in three out of six used models.