EN
Before degraded areas can be promoted among would-be investors as potential sites for investment, a detailed record of such areas should be kept to show a general picture of this phenomenon in spatial, environmental and economic terms. Basically, one of the main obstacles to the re-development of these areas in Poland is a lack of knowledge about the quality of such land. The creation of a national base of areas previously invested in, comprising the data about their size, uses and environmental features, e.g. former industrial, railway, port or military ones, etc. should be regarded as the prerequisite for an efficient spatial policy.