Geomatik 2 (Subject) / Modul 2 (Lesson)

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• How do you convert points into polygons? Use a spatial join
• Overlay analyses these operations include union, intersect, identity, clip, merge, dissolve, buffers, etc
• Identify characteristics of a distribution techniques are similar to those covered in the first part of this module including mean center, standard deviational ellipse, etc.one important thing to note is that when these operations are computed for polygons, they operate on the centroid points of the polygon
• Describing spatial patterns This category of techniques help you determine whether features and/or values are clustered, dispersed, or randomly positioned throughout the study area
• What is the most severe form of global environmental change? Land use change
• Urbanization human-dominated process that has lasting impacts on biodiversity and ecosystem processes
• Shrinking cities urban areas that are experiencing population decline and inability to maintain previous levels of infrastructure/services
• Do vacant properties have higher rates of crime? decay signals to criminals that crime monitoring rates are lower (broken window theory). vacant properties provide criminals with rent-free space
• What is an .mxd file? map document
• What does an .mxd store? 1. what data to show2. where to find the data3. where to show the data
• What does an .mxd not store? it doesn't store the actual map in its entirety
• What is an LYR file? a layer file
• What is a GDB? geodatabase
• Who is Jack Dangermond? Founder  of ersi
• What does ESRI stand for? Environmental Systems Research Institute
• continuous phenomena raster data model, things like elevation and temperature
• discrete objects buildings, roads, emergency shelters, volcanos each have their own symbols
• vector data model points, lines, polygons
• lines  just have width 
• polygons have length and width
• rows in a table are called records
• columns in a table are called a field
• what does the cylinder do? stores feature classes
• 4 feature classes  1. points2. lines3. polygons4. annotation
• creating vector data by digitizing in ArcMap 1. create new file geodatabase2. create new feature class in it3. trace some objects from the satellite image
• what toolbar do you need to digitize things? the editor toolbar
• digitizing details, the more sample points the better
• Smaller map scale less detail
• larger map scale more details
• Accuracy difference between recorded value and true value
• Precision fineness of a measurement
• Raster Data Model  continuous surfaces, each cell has a value, integer values, real values, 
• spatial resolution A term that refers to how small the elements of an image are; high spatial resolution means the device or technique can resolve very small elements

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