Proceed to GeoCommunity Home Page

SpatialNewsGIS Data DepotGeoImaging ChannelGIS and MappingSoftwareGIS JobsGeoBids-RFPsGeoCommunity MarketplaceGIS Event Listings
HomeLoginAccountsAboutContactAdvertiseSearchFAQsForumsCartFree Newsletter

Sponsored by:

Download Data





FEMA Flood Data





Index Grids

About Data


SpatialNews Daily Newswire!
Subscribe now!

Latest Industry Headlines
CherriPik Reinvents Mapping App Experience
Autodesk to Present at Upcoming Investor Conferences
Mapmechanics Delivered Its Roadmap for Slicker Geographic Analysis with New Online Options
exactEarth Invests in Satellite 'Internet-of-Things' Technology Company
United States Hyperspectral Remote Sensing Industry 2015 Market Research Report

Latest GeoBids-RFPs
GPS/GIS Redesign-KS
Mapping Services*written in FR
Digital Mapping*written in French
Rural Areas Mapping*Germany
Cadastral Surveying*Written in LT

Recent Job Opportunities
GIS Programmer - Software Engineer I/II for NOAA NWS IDP

Recent Discussions
shapefile of Atlantic Ocean
Modifying existing ArcGIS tools
vicinity maps for cad plans
.GZ File Viewing
Data HelpDesk - GIS Glossary

Back to Index

1) Images containing individual dots with color values, called cells (or pixels), arranged in a rectangular evenly spaced array. Aerial photographs and satellite images are examples of raster images used in mapping.
2) Method for storing spatial data that involves assigning a value to each dot in a large matrix. This method is very useful for modeling continuous phenomena like elevation of temperature.

Remote Sensing
Using a recording device not in physical contact with the surface being analyzed including:
1) Using sensors sensitive to various bands of the electromagnetic spectrum.
2) Assessing its spectral image without having the sensor in direct contact with the surface.
3) Interpreting environmental conditions at, below and above the surface of the earth, typically by processing images from an aircraft (i.e. aerial photography), satellite imaging (ie. SPOT), or radar.

Fineness of detail that can be distinguished in an image, as on a video display terminal.

1) "Display Resolution" The density of the pixels that compose an image (See Pixels). The greater the number of pixels per square inch of screen, the greater the resolution. In print, resolution is measured in dots per inch (dpi).
2) "Spatial Resolution" The smallest possible map feature that can be accurately displayed at a specified map scale. For example, in a 1:24000 scale map, a 50 foot distance between a roadway and railroad track centerline is one fortieth of an inch. Since the thinnest pen line width is presumed to be one fortieth of an inch, it is impossible to accurately represent the alignment of these two centerlines and still have a visible gap between them. To do this takes a smaller map scale (< 1:24000).

Sponsored by:

For information
advertising rates
Click Here!

Copyright© 1995-2014 MindSites Group / Privacy Policy

GeoCommunity™, Wireless Developer Network™, GIS Data Depot®, and Spatial News™
including all logos and other service marks
are registered trademarks and trade communities of
MindSites Group