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Kass Green
Imagery and GIS
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Contents
Acknowledgments
Страница 6
Chapter 1
Introduction
Why Imagery and GIS?
Why Now?
Book Organization
Case Study of Sonoma County, California
Chapter 2
Thinking About Imagery
Introduction
What Is Imagery?
Imagery Data Structure
Imagery and GIS
Rasters versus Vectors
Characteristics of Rasters
Type
Bands
Cell Size
How Is Imagery Used in a GIS?
Image Classification — Turning Data into Map Information
Types of Maps Created from Imagery
Digital Elevation Models
Thematic Vector and Raster Maps
Feature Maps
Imagery Workflows
Chapter 3
Imagery Fundamentals
Introduction
Collection Characteristics
Sensors
Imaging Surfaces
The Electromagnetic Spectrum
Film versus Digital Array Imaging Surfaces
Source of Energy: Active versus Passive Sensors
Wavelengths Sensed
Passive Sensors
Active Sensors
Lenses
Openings
Bodies
Sensor Summary
Platforms
Different Types of Platforms
Piloted or Unpiloted
Altitude
Speed
Stability
Agility
Power
Collection Characteristics
Spectral Resolution
Radiometric Resolution
Spatial Resolution
Viewing Angle
Temporal Resolution
Extent
Organizational Characteristics
Introduction
Pricing and Licensing
Access
Case Study — the Effects of Price and Licensing on the Use of Landsat Imagery
Summary — Practical Considerations
Chapter 4
Choosing and Accessing the Right Imagery
Selection Framework—What’s Required versus What’s Available
Will the imagery be used for visualization, or to make a map?
What is the smallest item to be identified on the ground?
What is the time frame of the project and its results?
What types of features need to be mapped?
What is the size, shape, and accessibility of the project area?
What are the requirements for spatial and spectral accuracy?
Will the imagery be shared with other organizations?
Is the imagery accessible?
What is the project budget?
Summary
Imagery Sources
Overview
ArcGIS Online
Commercial Photogrammetry and Remote Sensing Firms
Commercial Satellite Companies
Government Agencies
Unmanned Aerial Systems
Mapping Woody Debris in the Great Brook
Sources of Passive Panchromatic and Multispectral Imagery
High- and Very-High Spatial Resolution
Moderate- and Low-Spatial-Resolution Panchromatic and Multispectral Imagery
USGS EROS
ArcGIS Online
ESA
Thermal Imagery — All Spatial Resolutions
Hyperspectral Imagery — All Spatial Resolutions
Sources for Imagery Collected from Active Sensors
Lidar
Radar
Summary — Practical Considerations
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