Working with Coordinate Systems The great thing about geographic information systems is that data from different sources can be juxtaposed, according to the way that each is related to the suface of the planet -- and new information emerges about possible realtionships. This is made possible by spatial referencing systems such as Latitude and Longitude or projected coordinate systems. Software is getting better at aligning images and layers that are referenced in different coordinate systems, nevertheless we often encounter problems getting layers to line up as they should. This document provides some tips for troubleshooting and fixing alignment problems with spatial data. Topics Covered in this Document Related Documents Aligning GIS Data Layers in ArcGIS GIS databases organize information about observations with information about location. Assessing a Non-alignment Problem Most of the time ArcMap is able to load different layers and to project them apropriately. Inspect Layer Properties Identifying a Coordinate System
Free GIS datasets Live 5.0 Contents — OSGeo-Live 5.0 Documentation OSGeo-Live 10.0 Contents¶ Desktop GIS¶ General GIS viewing, editing, and analysis on the desktop: Browser Facing GIS¶ General GIS viewing, editing and analysis in the browser: OpenLayers3 - [QuickStart] - Browser Mapping LibraryLeaflet - [QuickStart] - Mobile Friendly Interactive MapsCesium - [QuickStart] - 3D globes and 2D maps in a browserGeomajas - [QuickStart] - Browser GIS ClientMapbender - [QuickStart] - Geoportal FrameworkGeoMoose - [QuickStart] - Web GIS PortalCartaro - [QuickStart] - Geospatial CMSGeoNode - [QuickStart] - Geospatial Content Management System Web Services¶ Publishing spatial data to the internet: Data Stores¶ Storing spatial data: PostGIS - [QuickStart] - Spatial DatabaseSpatiaLite - [QuickStart] - Lightweight DatabaseRasdaman - [QuickStart] - Multi-Dimensional Raster DatabasepgRouting - [QuickStart] - Routing for PostGIS Navigation and Maps¶ Spatial Tools¶ Specific analysis tools: Domain Specific GIS¶ Applications targeted at a specific domain: Data¶ Spatial data sets:
Django.contrib.flatpages without models TraceMedia - Luminous Cities Megacities View the geo-coded traces of Flickr users in the largest world cities, including Beijing, Cairo, Hong Kong, Tokyo. Tokyo City Map Americas Glimpse how urban spaces are recorded by geo-located Flickr photos in the Americas - Beunos Aires, Detroit, Mexico City, San Francisco. Detroit City Map Europe Explore the data footprints left by Flickr in some European urban centres. Venice City Map
Digitizing Errors in GIS Digitizing in GIS is the process of converting geographic data either from a hardcopy or a scanned image into vector data by tracing the features. During the digitzing process, features from the traced map or image are captured as coordinates in either point, line, or polygon format. Types of Digitizing in GIS There are several types of digitizing methods. Types of Digitizing Errors in GIS Since most common methods of digitizing involve the interpretation of geographic features via the human hand, there are several types of errors that can occur during the course of capturing the data. During the digitizing process, vectors are connected to other lines by a node, which marks the point of intersection. Dangles or Dangling Nodes Dangles or dangling nodes are lines that are not connected but should be. An open polygon caused by the endpoints not snapping together. Switchbacks, Knots, and Loops Example of a weird polygon where the line folds back on itself. Overshoots and Undershoots Slivers
Create a topographic profile Import file (KML, KMZ, GPX) loaded layer and topographic profile of the route. Sometimes, some files do not automatically create a profile! Zoom: 15Counter markers: 2Status: REQUEST_DENIEDАzimuth: 73°Mouse px: ...Lat./Lon.: ...Center point: -25.343780041796837, 131.03412500000002Center point location: ... How to make a topographic profile? Reset Find your area of interest on the map Select the cursor min. 2 points (max. 300) Ready – site profile will be generated in seconds Embed the chart on your site Copy and save the link to the chart Add the route to the map Program Geocontext-Profiler allows you to make topographic profiles anywhere on Earth in the seabed and ocean floor. Within the program, you can find some advanced options that allow you to create a profile along the road, bicycle and pedestrian paths, and measuring the slope angle. Geocontext-Profiler on your website? Video: GEOCONTEXT-GISGoogle Maps JS API V3 – and
PostgreSQL: Welcome The Best Map Ever Made of America's Racial Segregation | Wired Design Last year, a pair of researchers from Duke University published a report with a bold title: “The End of the Segregated Century.” U.S. cities, the authors concluded, were less segregated in 2012 than they had been at any point since 1910. But less segregated does not necessarily mean integrated–something this incredible map makes clear in vivd color. The map, created by Dustin Cable at University of Virginia’s Weldon Cooper Center for Public Service, is stunningly comprehensive. This is the most comprehensive map of race in America ever created. White people are shown with blue dots; African-Americans with green; Asians with red; and Latinos with orange, with all other race categories from the Census represented by brown. “There are a lot of moving parts in this process, so this can cause different shades of color to appear at different zoom levels in really dense areas, like you see in NYC,” Cable explains. Looking at the map, every city tells a different story.
Links « Contour Education Interactive Maps Ordnance Survey MapZone This is a brilliant site that is perfect for introducing your students (all ages) and staff to the basic concepts behind GIS software. The site contains lots of information on what GIS is, how it is used in the real world as well as links to helpful sites. The best feature though is the GIS missions – or GIS games. Protected Planet This brilliant site lets you search a visual catalogue of the world’s protected areas. kmlfactbook.org The kmlfactbook.org page takes some of the global data available in the CIA World Factbook and displays it over a 2D or 3D map of the world. Map of Life The Map of Life is a well-supported project that organises data on species ranges over a range of beautifully designed basemaps. WWF Wildfinder The WWF Wildfinder allows your students to enter the common name of an animal and view its geographic extent. Geoscience Australia Sentinel Old Maps Online Maps of War ShowRWorld Online Global Reefs Map Online Map Editors Google Maps