To compare the orthophotographs available for different years in a given location, determine a location in Gipuzkoa or type in a combination of search characters in the Geographic Search Engine and press "Search". Consequently, select "View Ortho" and once the image is displayed, select "Overlay Orthophotos" - which is located in the upper-right corner of the image. When you have finished exploring the information, press "Finish overlay" to be able to access the map view controls back.
