![]() ![]() jpg format) placed next to each other, ordered in a pyramid scheme. Zoomable raster maps consist of many raster map tiles (in the. Raster map tiles are actually nothing else than raster images. Raster images are stored in image files of varying formats. In computer graphics, a raster graphic is a dot matrix data structure that represents a generally rectangular grid of pixels (points of color), viewable e.g. Web maps based on raster tiles technology are older but still widely used approach by many. Raster vs vector map tiles Raster map tiles You can use many standard MapTiler maps of the whole world or create your own data set. With MapTiler you can take advantage of both map data types. Vector map tiles are faster to load, and less demanding on the server-side performance but more demanding on end-users hardware. Raster map tiles are larger in size, less demanding on end-users' hardware but more demanding on the server-side performance. Also, you will find out how to create raster or vector map tiles from your own data with MapTiler Engine. ![]() You will learn about different MapTiler products, including MapTiler Cloud and MapTiler Data that offer ready-to-use raster and vector tiles of the entire planet for your projects and applications. The site editor may also be contacted with questions or comments about this Open Educational Resource.This article will help you understand the problematics of raster and vector map tiles and the main differences between these two map data types. Please send comments or suggestions on accessibility to the site editor. The College of Earth and Mineral Sciences is committed to making its websites accessible to all users, and welcomes comments or suggestions on access improvements. This courseware module is offered as part of the Repository of Open and Affordable Materials at Penn State.Įxcept where otherwise noted, content on this site is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Penn State Professional Masters Degree in GIS: Winner of the 2009 Sloan Consortium award for Most Outstanding Online Program Dutton e-Education Institute College of Earth and Mineral Sciences, The Pennsylvania State University. Dutton e-Education Institute and Assistant Program Manager for Online Geospatial Education, and Adrienne Goldsberry, Senior Lecturer, John A. Dutton e-Education Institute, Beth King, Senior Lecturer, John A. Dutton e-Education Institute Ryan Baxter, Senior Research Assistant, John A. Instructors and contributors: Jim Sloan, Senior Lecturer, John A. Dutton e-Education Institute, and Director of Education, Industry Solutions, Esri. For this reason, we'll consider the vector approach to terrain representation first.Īuthor: David DiBiase, Senior Lecturer, John A. However, much of the raster elevation data used in the National Map was produced from digital vector contours and hydrography (streams and shorelines). Digital contours can now be rendered easily from raster data. Raster elevation data are what's called for by the NSDI Framework and the USGS National Map. ![]() Raster elevation data, by contrast, consist of grids of points at which elevation is encoded at regular intervals. The distribution of elevation points across the quadrangle is therefore irregular. (See any cartography text for the distinctions.)Īs you will see later in this chapter, when you explore Digital Line Graph hypsography data using Global Mapper or dlgv 32 Pro, elevations in vector data are encoded as attributes of line features. The technical term for an elevation contour is isarithm, from the Greek words for "same" and "number." The terms isoline, isogram, and isopleth all mean more or less the same thing. On the left are elevation contours, a vector representation that is familiar with anyone who has used a USGS topographic map. Figure 7.4.1 compares how elevation data are represented in vector and raster data. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |