Vector GIS Product Categories

Wednesday August 30th 2000
Filed Under Features, Software 

Have you ever heard of the old saying that a carpenter who only knows how to use a hammer approaches the solution to every problem using the same hammer? Like the tools used by a carpenter, GIS products have highly specialized applications. For example, you would not want to rely on an Internet mapping product for desktop mapping because the features of one are not well suited for all of the tasks of another. Read more

Fortune 1000 Companies by State - Alabama Arkansas Arizona

Sunday August 27th 2000
Filed Under Data 

Alabama Arkansas Arizona Read more

Hypsography

Sunday August 27th 2000
Filed Under Glossary 

Definition: Lines connecting points of equal elevation on the surface of the earth. From the Greek word “Hypso” meaning height.

Hyperspectral Imagery

Sunday August 27th 2000
Filed Under Glossary 

Definition: Useful for classifying material types on the Earth’s surface - beneficial in agriculture and forestry management, mineral exploration, environmental monitoring and national security activities.

Hydrography

Sunday August 27th 2000
Filed Under Glossary 

Definition: Database representing the location of water bodies and flow lines.

How to Tell GIS File Formats

Sunday August 27th 2000
Filed Under Data 

There are well over 100 GIS, CAD and Remote Sensing applications on the market. Listed here are some of the more common file formats.

Difficulty Level: Easy    Time Required: 1 minute

Here’s How:

  1. The file extension is the last 3 charcters after the period in the file name. Each of the steps will be looking at these characters
  2. Files with *.e00 are ArcInfo export files.
  3. A set of three files with the same name but with the extensions *.shp, *.shx, and *.dbf are ArcView shapefiles.
  4. Files with *.mif and *.mid are MapInfo files.
  5. Files with *.dwg are AutoCAD files.
  6. Files with *.dxf are Drawing Exchange Files.
  7. Files with *.dgn are Bentley Microstation files.
  8. A TIFF (*.tif) file with an accompanying world header file (*.tfw) are georeferenced imagery files.

Weird Polygons

Sunday August 27th 2000
Filed Under Glossary 

Definition: Weird polygons are defined as polygons with missing nodes. The most common occurrence of this is when two lines cross over, giving the appearance of a polygon.

Waypoint

Sunday August 27th 2000
Filed Under Glossary 

Definition: A navigation GPS fix. Usually a destination or point of reference.

Universal Transverse Mercator (UTM)

Sunday August 27th 2000
Filed Under Glossary 

Definition: The Universal Transverse Mercator is an international plane (rectangular) coordinate system developed by the U.S. Army. The UTM divides the world into 60 zones of 6 degrees longitude. Each zone extends 3 degrees east and west from its central meridian and are numbered consecutively west to east from the 180-degree meridian. Transverse Mercator projections may then be applied to each zone.

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