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. Each one can be downloaded and run on your school’s network and they all have downloadable word documents that your students can use while they undertake the GIS missions. 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 Geoscience Australia Sentinel Old Maps Online Maps of War.
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. Manual digitizing involves tracing geographic features from an external digitizing tablet using a puck (a type of mouse specialized for tracing and capturing geographic features from the tablet). Heads up digitizing (also referred to as on-screen digitizing) is the method of tracing geographic features from another dataset (usually an aerial, satellite image, or scanned image of a map) directly on the computer screen.
Automated digitizing involves using image processing software that contains pattern recognition technology to generated vectors. Types of Digitizing Errors in GIS Dangles or Dangling Nodes Switchbacks, Knots, and Loops. Gothos links. Benlewis's gis Bookmarks. Gispython.org. Open Source GIS. 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.
Introduction to GIS. GIS Tutorials for Beginner, Intermediate, and Advanced GIS Users - GISTutor.com. The Federal Geographic Data Committee — Federal Geographic Data Committee. Data. ESRI. QGIS.