Geoprocessing Techniques (Week 14-15) PDF

Department of Environmental Science and Technology College of Science and Mathematics University of Science and Technology of Southern Philippines-CDO Campus  Learning Outcomes Analyze and perform data using geoprocessing tools perform specific task or chain together...

Department of Environmental Science and Technology College of Science and Mathematics University of Science and Technology of Southern Philippines-CDO Campus  Learning Outcomes Analyze and perform data using geoprocessing tools perform specific task or chain together sequences of tools Outline Geoprocessing provides a framework and tools for performing analysis and managing geographic data two primary uses: automating GIS tasks and analysis & modelling perform specific task or chain together sequences of tools Geoprocessing Tools Clip – extracts a subset of one feature class using one or more of the features in another feature class Most often, you will use polygons to clip features in another feature class the features you clip may be points , lines or polygons The attributes of the original features are preserved in the output feature class However, when a line segment is clipped to the polygon boundary, the updated length attribute is calculated for that feature  Administrative Boundary CLIP Road Network  Administrative Boundary CLIP Land Cover Intersect - features or portions of features which overlap in all layers and/or feature classes will be written to the output feature class.  use intersect when you want to know the area in common among multiple feature classes  intersect will combine the attributes from all input feature classes  useful when conducting a land use and land cover change analysis across different periods  INTERSECT Land Cover 2015 Land Cover 2010  Union - all features and their attributes will be written to the output feature class Land Cover 2015 UNION Land Cover 2010  useful when your input datasets have different attribute structures  the output feature class will have all features from the input data, including attributes.  union create new polygons if the input feature classes contain overlapping features Merge -combines multiple input feature classes of the same data type into a single, new output feature class  useful when your input feature classes have the same attribute structure.  the output feature class will have the same attribute structure as the input data and contain the features from both feature classes  MERGE Administrative Boundary Dissolve -tends to aggregate features based on specific attributes  Administrative Boundary - Barangay DISSOLVE Administrative Boundary - Municipality Buffer -creates an area around input features to a specified distance BUFFER 500m Road Buffer Buffer -creates an area around input features to a specified distance BUFFER 500m Road Buffer ERASE – only those portions of the input features falling outside the erase features outside boundaries are copied to the output feature class Philippines ERASE Laguna de Bay End…. Thank you!