QUIZ #1 NAME: Karina Garcia 1. What is a layer? A layer is part of a map that you can use in a GIS map. You can use many layer in one map. For example cities, rivers, etc can be a separate layer that you can overlap in a GIS map. 2. What is a feature? What kinds of features are there? A layer can contain many features. A feature is a geographic object of a layer. A feature can have different shape, so you can represent house, cities, etc with different geometrical forms. There are three forms: polygons, lines, points. The features can have different representation in every single layer. 3. What is a surface? Specifically, what is a raster? Some layers are not a composition of features, this type of features is called surfaces like the Ocean. There is a geographic expansion. A raster is cell that represent a measurable data like temperature, climate or some other data that can’t be represent by a feature. A surface is a composition of rasters.