Introduction to Geospatial Technologies
Bradley Shellito
Language: English
Pages: 523
ISBN: 1464188726
Format: PDF / Kindle (mobi) / ePub
This book is a great introductory guide to GIS and Remote Sensing.
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Match the image), and/or translated (altering 7/21/11 3:58 PM 59 How Is Data Transformed to a Georeferenced Format? y FIGURE 3.5 Four ways that the unreferenced data can be warped to align it with the source. y Rotation x y Skew x y Translation x Scaling x the location and placement of the map). See Figure 3.5 for examples of the effects of each of these transformations. This transformation of the data changes it to align with the new coordinate system. There are a number of.
Represent the Real World as Continuous Fields? Y-axis 107 FIGURE 5.6 The grid cells of the raster data model. Number of columns Number of rows Row + Column X-axis + Center of lower-left grid cell using a set of evenly distributed square grid cells, with each square cell representing the same area on the Earth’s surface (see Figure 5.6 for the layout of the grid cells). For instance, to represent an entire section of the landscape, each grid cell might represent 10 square feet, or 30.
(the default install folder is called ArcGIS). ArcMap will begin by asking you questions about “maps. ” In ArcMap, a “map document” is the means of saving your work—since you’re just starting, click on Cancel in the Getting Started dialog box. The lefthand column (where the word Layers is) is referred to as the Table of Contents (TOC)—it’s where you will have a list of available data layers. The blank screen that takes up most of the interface is the View, where data will be displayed. Table of.
Records (see Lab 5.2 on page 130 for how to do this). 12. This particular query returned nine records (listed as the nine records shown selected in the attribute table). 13. Next, we’ll build a compound query to find all cities in South Dakota with a population of greater than 50,000 persons. Bring up the Select by Attributes dialog box again, this time creating a query looking for (“ST” = ‘SD’) (it may still be there from the last time the query was created—make sure to put in the.