• Tiling: In programs such as ARCgis and ESRI the ability to tile and mosaic images is a key feature. With python, it is also quite easy to tile and mosaic a set of images by using GDAL, the Geospatial Data Abstraction library. It comes with some very useful utilities for image processing and translation. By running gdal_merge.py from the command line, the ETOPO1 geoTIFF files were tiled. The merge coastline for California was obtained by running the following code from the command line: