Map projections explained a beginners guide youtube. Understanding the concepts involved with map projections will give you the ability to understand your data better and work with other spatial data in arcgis desktop more effectively and efficiently. Understanding coordinate systems and projections for arcgis 1. In cartography, a map projection is a way to flatten a globes surface into a plane in order to make a map. A gis geographical information system is a fun and functional piece of equipment that offers maps, and so much more. The course format includes detailed information on how these concepts are applied to. You can analyze terrain and compare maps, keeping in mind the fact that the map you see is basically a model of the terrain a gridbased gis offers some algebraic functions to help you finetune a search, and every gis provides a. Understanding map projections melita kennedy, steve kopp. This powerpoint is available at gis linkspresentations understanding coordinate systems for arcgis 2. Geosynchronous a geosynchronous orbit is an orbit around the earth with an orbital period of one sidereal day, intentionally matching the earth\s sidereal rotation period. When asked, select yes that you want to add the new layer to the map. Goals identify the spatial reference information for various datasets create custom coordinate systems and define projections.
Arcinfo, arccatalog, arcmap, arctoolbox, arcplot, and arcedit are trademarks of environmental systems research. Remove the stations table and stationsevents layer by right clicking and selecting remove. Redlands, california july, 2015 learn the fundamentals of making digital maps, analyzing geospatial data, and building and editing spatial databases using the workbook getting to know arcgis, fourth edition, published by esri. A tutorial on map projections and geographic coordinate systems. Layers can be added and removed from the map, but are rendered via a mapview for viewing data in 2d or a sceneview for viewing data in 3d. The spatial or map extent covered by the dataset often referred to as the spatial domain learning more about coordinate systems. This selfpaced, online training teaches the fundamental concepts of map projections, datums, and coordinate systems and demonstrates how to use them using esris arcgis. Esri demographic data can be found in a multitude of presentationready reports and maps.
Presentation objectives understand basic concepts on coordinate systems for the gis user. Introduction to gis or getting started with gis or equivalent knowledge is required. Here is a series of links to help you learn more about applying map projections and coordinate systems in your work. Understanding map projections is an important building block when working with and setting up any geographic information system gis.
Updated for use with the latest version of esris arcgis for desktop. Essential characteristics of all map projectionsaspect, perspective, and distortionare discussed. Instead of starting with a topic such as map projections or seismicity. Esri publishes getting to know arcgis, fourth edition.
More information on displaying coordinate data and understanding map projections can be found. This story map traces those that have gained fame as sacred or historic sites, or specimens of unusual size, shape or age. Getting started with the arcgis mobile apis kris bezdecny, david martinez andy gup, david cardella. This book introduces and illustrates geographic and projected coordinate systems and offers information on how they can be applied to data. Save your map document, especially if you havent done so recently. Complete with fullcolor maps and diagrams, this book presents practical techniques on how to identify data projections, create custom projections to align data. See choosing a map projection about coordinate systems and map projections. Article 24893, how to identify an unknown projected. The map of massachusetts in unprojected decimal degrees of longitude and latitude note the proportion of the lines and the circle. Regardless of the map projection chosen, some distortions to these. Exhibit 3 listing of available training relative to gis. All projections of a sphere on a plane necessarily distort the surface in some way and to some extent. A communications satellite or comsat is an artificial satellite sent to space for the purpose of telecommunications.
Completion of basics of geographic coordinate systems or equivalent knowledge is recommended. Finally, you will be able to convert degrees, minutes, and seconds to decimal degrees. This article applies to only arcgis for desktop versions 10. Thus a map instance is a simple container that holds the layers, while the view is the means of displaying and interacting with. Use the workbook and exercises to get started making maps and analyzing data.
Understanding map projections, datums, and coordinate systems. We will taker a closer look at the popular mercator projection and examine how the projection affects area. This poster shows the object model diagram for the geoprocessing scripting object. But if the shapefile is an item in agol and the user downloads the zipped shapefile and adds that to arcmap, it will maintain its original projection. Basics of map projections esri training web course. Understanding coordinate systems and projections for arcgis. In this series, we talk about the basics of map projections, including coordinate systems and datums. The course format includes detailed information on how these concepts are applied to different regions of the pacific islands.
In cartography, a map projection is a way to flatten a globes surface into a plane in order to. Although the earth is best represented by a spheroid. This selfpaced, online training teaches the fundamental concepts of map projections, datums, and coordinate systems and demonstrates how to use them using esri s arcgis. The emphasis is on theory, but students gain practical experience working with arcgis software to apply map projections. The map class contains properties and methods for storing, managing, and overlaying layers common to both 2d and 3d viewing. An esri training course, either online format with multiple modules, or online video. Choose an appropriate map projection for a specific part of the world and map purpose. A guide to map projections is an easytonavigate troubleshooting reference for any gis user with the common problem of data misalignment. This requires a systematic transformation of the latitudes and longitudes of locations from the surface of the globe into locations on a plane. A good starting place for finding gis books is the the national academies press site which offers over 4,000 titles in pdf format for free from its site. Coordinate systems, also known as map projections, are arbitrary designations for spatial data. Supports multiple map projections dynamic, cached, and feature layers bing maps and open streetmap. We will taker a closer look at the popular mercator projection and examine how the.
Conic map projections are best suited for use as regional or hemispheric maps, but rarely for a complete world map. Their purpose is to provide a common basis for communication about a particular place or area on the earths surface. Completely updated with fullcolor maps and diagrams from arcgis desktop 10. For more information on the location of the coordinate systems folder in arcgis for desktop 10.
These three books introduce you to geographic and projected coordinate systems and to geodatabase concepts and shows how to use the arcgis desktop products arcinfo, arceditor, and arcview to implement geographic database designs. The distortion in a conic map makes it inappropriate for use as a visual of the entire earth but does make it great for use visualizing temperate regions, weather maps, climate projections, and more. Many common tasks are covered, including navigating digital maps, finding gis data online, setting map projections, symbolizing and labeling maps, classifying data, making map layouts, building spatial databases, editing data, geocoding addresses, querying maps, processing data, and analyzing spatial relationships. This topic provides an overview of the types of reports available to you and outlines how you can use these reports to understand trade areas, find new. Select from a wide variety of existing reports, or create custom reports to meet your marketing needs. Although the earth is best represented by a spheroid, the earth is sometimes treated as a sphere. The circle gives the impression that worcester is approximately the same distance from boston as new hampshire, and that the state is nearly five times longer, east to west, as it is northtosouth.
Arcgis for desktop now supports over 5,000 geographic, projected and vertical coordinate systems. Article 29280, what geographic coordinate system or datum should be used for my data, links to a document that lists all geographic coordinate systems by continent and country. Select a suitable map projection or coordinate system. A zipped shapefile that is added to a web map or added to arcmap from agol will also be projected into wgs 1984 web mercator auxiliary sphere. Learn what a map projection is, why they are used and what impact they have on maps gis systems. Pdf on jan 1, 1994, melita kennedy and others published understanding map.
An esri class modified by ncgc to include relevant content for soil scientists, taught by ncgc employees who are also esri authorized. All publications are available to purchase online and include topics that cover many areas of public and private endeavor including landuse planning, health care, education, business, government, and science. Free of distortion at the central meridian at 3646 n. Under related information below, click the link titled projections table 2009 to access. Learning more about map projection and coordinate system concepts. To select a map projection, determine which of the properties is the most important for the project, and select the coordinate system or map projection that best preserves that property. This reference guide shows all the supported linear units, map projections, and projected coordinate systems. This conceptual overview introduces and explains the concept of geodatabasesobjectoriented data modelswhich are introduced in arcinfo 8, the worlds most advanced geographic information system gis software package. Sinusoidal projection wikipedia, the free encyclopedia you may also find it helpful to learn more about coordinate systems, projections, and datums these can be tricky to understand and are often dry topics, unless you find them interesting. Basics of map projections for arcgis 10 wc rice 3 working with coordinate systems in arcgis 10 wc rice 3 map design and production type free hrs using arcmap in arcgis desktop 10 wc public 3 creating map books using data driven pages ts public 1. Most of these free gis books are available in downloadable pdf format and can be read from a computer or on an ebook reader. A guide to map projections is an easytonavigate, troubleshooting reference for any gis user with the common problem of data misalignment.
Map projectionspdf versions of numerous projections, created. Projection basics for gis professionalshelp arcgis for. Understanding map projections landing page for kartoweb. How to define map projections making sure your gis data is in the right place on the map as people share their data over the web, its becoming more important to define the coordinate system to ensure that a dataset displays in its proper location and aligns correctly with other data. Whether familiar with the science and mathematics involved with projecting geographical data or learning it for the first time, this book will help users understand the difference between geographic and projected coordinate systems. Web and mobile gis type free hrs introduction to esri community analyst ts public 1. Argis online projections geonet, the esri community. The definition of the map projection for projected coordinate systems. One easy way to understand how map projections alter spatial properties is to visualize shining a light through the earth onto a surface, called the projection surface. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. This mathematical transformation is commonly referred to as a map projection. Presented by john schaeffer juniper gis services, inc.
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