This layer is a georeferenced raster image of a map showing Approaches to Estero Salado. This panel is part of a nautical chart titled "South America, Ecuador, Approaches to Estero Salado and Puerto Marítimo de Guayaquil" originally published by the United States. National Imagery and Mapping Agency in 1999. This layer is 1 of 2 maps representing the original source sheet map. Map no. 22050. Historic paper maps can provide an excellent view of the changes that have occurred in the cultural and physical landscape. The wide range of information provided on these maps make them useful in the study of historic geography, and urban and rural land use change. As this map has been georeferenced, it can be used in a GIS as a source or background layer in conjunction with other GIS data. United States. National Imagery and Mapping Agency. (1999). South America, Ecuador, Approaches to Estero Salado and Puerto Marítimo de Guayaquil (Raster Image). LandInfo. Available at: https://purl.stanford.edu/rz172st2176 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
