Land amelioration data are free for download in shapefile vector format. These are non-updated historical data acquired by the Agricultural Water Management Administration (ZVHS) by digitizing analog maps. Due to the fact that there is no record of land amelioration and their changes in the field, the geometric and attribute range of data is not complete. Data is provided free of charge. The condition for further presentation or other use of this data is always the provision of information about the source (Agricultural Water Management Administration / Ministry of Agriculture). The data may only be used for purposes that are consistent with the stated data properties. More detailed information about the data is given in the attached file Digitization Methodology, that is part of the dataset. The data structure is described in the files HMS Data Model - description layers and SHP structure. The data are divided into folders according to the districts of the Czech Republic.