GIS book

9. GIS Book: Spatial analyst

by

Spatial analysis is the process of modeling and obtaining results through computer processing and then examining and interpreting the results of the model. Spatial analysis is useful for assessing suitability … Read more

8.5. GIS Book: Dissolve

by

This tool unifies geographic information on the basis of an attribute; in other words, it merges information that shares an identical value within the attribute table. Figure 37 shows that … Read more

8.4. GIS Book: Merge

by

Merge tool can be used to merge two or more entities into a single layer. All merging entities must be of the same type (points, lines or polygons). Caution should … Read more

8.3. GIS Book: Clip

by

The Clip tool allows you to trim part of an entity based on the perimeter of a polygonal layer (Figure 35). The polygonal layer is used to limit the extent … Read more

8.2. GIS Book: Intersect

by

The intersection allows you to search for the area of two or more overlapping layers. The Intersect tool calculates the intersection area in a new layer. To use the tool, … Read more

8. GIS Book: Geoprocessing tools

by

GIS tools undoubtedly automate processes that used to take a long time to carry out. In general, manual tasks often require a great deal of effort to complete. Geoprocessing is … Read more

7.4. GIS Book: Operations

by

The Field Calculator performs simple and complex calculations for both text strings and mathematical operations. Note that the modifications affect all records (if none is selected) or only the selected … Read more

7. GIS Book: Tables administration

by

Tables are used to store descriptive information. In ArcGIS they are usually linked to a vector layer or appear individually. The alphanumeric information forming a table can be stored as … Read more