During the last years the forest reserve Thomas Van Der Hammen has acquired great importance in the city of Bogota, due to its relevance in the delicate ecological balance that still exists in the city. However, due to the socio-economic dynamics and the rapid pace of expansion it has been presenting in the last decade certain areas of the reserve have been developed urbanistically weakening the structure and compromising hectares of native flora and fauna of the reserve. That is why this research seeks to generate thematic mapping of existing coverage in the reserve in order to get a timeline to identify sources of affectation and those parts of the book that have been particularly affected by the expansion urban and declining physical spaces with neighboring municipalities that eliminates the effect of conurbation with the capital. In the process techniques of digital image processing, advanced image fusion algorithms (Wavelet) and capture spectroradiometry measurements, in order to obtain thematic mapping, perform multi-temporal analysis were used to quantify the resulting figures and consolidate a bank reflectance measurements to identify the impacts that have occurred in the forest reserve.