If you’re having trouble, want to report a bug, provide a suggestion, or just want to say hello — please fill out the form below. If you’re having trouble, want to report a bug, provide a suggestion, or just want to say hello — please fill out the form below. a reference system used to represent the locations of geographic features, imagery, and observations such as GPS locations within a common geographic framework – numerical assessment of how map scale at specific map location compares to map scale at standard point, or along standard line – equivalent (equal area) – geo comparisons across space. use for thematic maps to represent proportions (color, dot density) – reduce wear/tear, facilitate easy access to data, easy to retrieve quickly, can be georeferenced to provide geo context w/ newer data – uses known location of 2+ reference points and known distance betw. subject and each reference point (for accuracy, 3+ ref points) – process of finding associated geographic coordinates (often lat/long) from other geographic data, such as street address, zip codes, etc) – properties of geographic objects that remain constant even when geographic shape is distorted (from different map projection, etc) – data can be used in ways not foreseen by producers and users w/o knowledge to judge whether application is APPROPRIATE – data input and editing phase (digitizing error, often related to georegistration, random error, missed features, malfunctioned scanners) 3. conceptual error (users determine data, can misclassify info. ex/ classify city by voting behavior to study fertility pattern. data itself can also be misclassified) 4. procedural/analytic error (logical error) (issues of processes on data. misclassification, data clipped erroneously, wrong units, join wrong data tables, etc) – includes manipulations and methods that can be applied to Geographic data, to add value, support decisions, and reveal patterns and anomalies not immediately obvious – simple numerical vals that describe aspects of, or simple properties of geographic data, such as length, area, shape, or relationship between objects, like distance or direction – spatial join: cousin of spatial query, take good info from one table and put in another table (click on layer to accept info, draws info into that table) – Thiessen polygons: method assumes values of un-sampled area are equal to val of closest sampled point (connect sample points, then draw bisectors perpendicular to these lines) – usually stratified (regularly spaced), patchy (software generate points in specific space), random, adaptive (samples in clustered area, help for topographical stuff) – set of constructs for representing GEOGRAPHICAL objects, data, processes, and relationships in the digital environment – foundation for managing data objects (pt/line/polygon), inter-relationships between those objects, and associated attributes within a geodatabase – set of interconnected linear features through which material, goods, and people are transported, or along which communications or info is received – computer software for which the human-readable source code is made available under copyright license that meets open source Definition 7. distribution of license (rights attached to program must apply to all whom the program is redistributed w/o need for execution of additional license by those parties) 9. License must not restrict other software (license cannot insist that any other software it is distributed with must also be open source) 10. license must be technology-neutral (no click-wrap licenses or other medium-specific ways of accepting the license must be required) Source.