|Product Name||Fundamentals Of Geographic Information Systems|
|Category||Book / Magazine / Publication|
|Amazon.com||Buy on Amazon ~ 0470129069|
|Price New||28.99 US Dollars (curriencies)|
|Price Used||7.00 US Dollars (curriencies)|
|Width||0.84 inches (convert)|
|Height||10.12 inches (convert)|
|Length||7.3 inches (convert)|
|Weight||27.84 ounces (convert)|
|Author||Michael N. Demers|
|Long Description||Locate your place in the exciting field of GIS|
In existence since 1962, Geographical Information Systems (GIS) are really coming into their own today. And not just in your car's GPS system or your cell phone's tracking capabilities. GIS is finding applications throughout science, government, business, and industry, from regional and community planning, architecture, and transportation to public health, crime mapping, and national defense.
Michael DeMers's Fundamentals of Geographic Information, Fourth Edition brings an already essential text up to date, capturing the significant developments in the field and responding to the needs of a diverse set of readers, from geographers to students in a host of other fields.
If you are a non-geographer or new to GIS, get a quick introduction to the "lay of the land" of GIS through the new "Spatial Learner's Permit" section. Then join in the excitement of discovery with GIS databases as you absorb the such concepts and skills as digital geographic data and maps, GIS data models, spatial analysis, measurement and classification, cartographic modeling, and GIS design.
Responding to both the needs and technical skills of today's students, this Fourth Edition:
* Makes concepts accessible to students from a wide range of backgrounds
* Offers more practical and relevant coverage of GIS design and implementation
* Reflects the latest changes in GIS applications
* Examines in greater depth the underlying computer science behind GIS
* Uncovers the most recent developments on GIS research
* Expands coverage of the increasingly robust literature on cartographic visualization
* Includes Web-based labs and links to current and updated dataset resources
Taking an open-ended, hands-on approach that gets you to ask your own questions about the underlying concepts, the Fourth Edition helps you not only master the basics but acquire the active problem-solving skills that are a key component of success in the GIS industry.
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Article of interest
Code 128 is a high-density 1D barcode symbology. This barcode set makes use of the entire 128 ASCII characters which include letter, number and symbols.
As with all barcodes, there are indicators to identify where the barcode starts and stops. These are marked in yellow below. Code 128 also has a check character which has been marked in green. The remainder of the barcode is the data being encoded. The text below the barcode is optional and is for human consumption in the event the barcode can't be scanned or if people also need to know what the code means.
Each character in the barcode symbol is composed of three bars and three spaces. Each bar or space must range from 1-4 units and the sum of all the width of all bars must work out to an even number. The stop marker is special because it adds an extra bar of 2 units at the very end (4 bars and 3 spaces). There are three different start markers to to identify which code set is being used. To represent all 128 characters, the code sets can be within a single barcode as needed by using control characters 98-101 (depending on the code set).
The check character is calculated by summing the value of each character and multiplying it by its position. The start character is also part of the sum but is added without weight (multiply by 1 just like the first encoded data character) then when you have the sum take the modulo 103 remainder. This gets a little more complex when mixing modes within a single barcode.