G492 GIS Applications
Vector Data Models
GIS Vector Data Model
points and x,y geocoordinates are used to constructure spatial features
Point-Based Spatial Features
points (uh, dah!)
straight line segments
G492-GIS for Earth Sciences
Raster Data Structure
Basis - grid cell structure
representing map elements as dimensional pixels that are attached to cell
Raster Data - applicable to map data that varies continuo
ES341 Database Management and Attribute Data in GIS
a. Spatial Data geometry and positions of map features
i. E.g. line layer representing county roads
b. Attribute Data characteristics of features
i. E.g. information attached to
G492 GIS for Earth Sciences
Map Projections and Coordinate Systems
Fundamental Concern with Map Work
Maps / GIS
2-D representation of Earth surface
locations of map features on cartesian coordinate system
INSTRUCTIONS FOR JOINING NRCS SOIL UNIT
DESCRIPTIONS TO SPATIAL FEATURE CLASS
Download soil data from NRCS web source:
Soil spatial data obtained from NRCS does not include descriptions for soil units. However, if
INTRODUCTION TO ARCGIS SOFTWARE
History of Software Development
a. Developer ESRI - Environmental Systems Research Institute, Inc., in 1969 as a
privately held consulting firm that specialized in landuse analysis projects.
i. Software Developers origin
Introduction to Geographic Information Systems
Geographic Information Systems (GIS)
maps = models of the Earth
Traditional maps - paper drawings / models of the Earth
map distribution = spatial distri
Taylors Choice Selected GIS Terminology A-Z
(Draft 1 Jan. 2011; from ESRI online resources)
In cartography, text or graphics on a map that provide information for the map reader. Annotation may
identify or describe a specific map entity, provid
Overview of Projections and Datums (Frequently Asked Questions)
What is a projection?
Which projection should I use?
What's a datum?
Which datum should I use?
Why don't my GPS lat/longs match my existing lat/longs?
What are NAD27 and NAD83?
What is the Ea
ES341 Overview of key file formats and file extensions in ArcGIS
Commonly Encountered File Types/Extensions in ArcGIS
.mxd A file containing a map, its layers, display information, and other elements used in ArcMap.
Double-click to open the document withi