![]() Interpolation tools: Kriging, IDW, Splines, etc.The following are examples of tools in ArcMap will convert rasters to vectors or vectors to rasters: ![]() Expected types of analysis: some tools only work with raster or vector data When working with raster or vector data within the sphere of spatial analysis there are of course a myriad of use cases that can be employed but as has been touched upon already there are specific cases where it can make sense to use one over another.In this chapter, we’ll cover the two basic data types (vector and raster), common GIS file formats, and our top five GIS data sources. However, GIS mapping requires more than coordinates. Available storage: some rasters are really large When comparing the building footprint the area derived from the raster dataset was 0,6 larger than the vector derived one. In the last chapter, we covered the location component: mapping.Other factors that can influence your decision include: When topology is needed for the analysis.Spatial detail is important (When "close enough" isn't really good enough).Working with discrete data types: trees, buildings, property boundaries.Working with continuous data types: elevation, slope, satellite photos. ![]() There are three types of geodatabases: file, personal, and ArcSDE. GDB: Geodatabase The file geodatabase is a collection of geographic datasets of various types, with the most basic types being vector, raster, and tabular data. Issues include:Ĭhoosing Between Data Models "Raster is faster but vector is corrector" SDC is ESRI's highly compressed format, which is directly readable by ArcGIS software. Whenever you convert data from raster to vector or vector to raster, you will degrade the data by some amount. The image below looks very similar to the one above but now the watersheds are represented as rasters. The "Feature To Raster" tool will convert these polygons to rasters. See the Raster Interpolation geoprocessing tools for detailed information on the best methodology for your data. There are other methods available to make this conversion, such as inverse distance weighting, kriging, and natural neighbor. Knowing their structure provides insights on their usage. By creating a raster from your vector data, you can use the resulting surface for other visualization needs. You can convert data between rasters and vectors but the nature of the data will be very different.īelow is an example of watersheds in Humboldt County represented as Shapefiles. Vector and raster are the two common data types used in GIS. You'll want to select the data type based on the nature of the data and the analysis you want to perform on it. Many features can be represented as rasters or vectors.
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