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. 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.
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.
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.