features in the output vector line feature. Raster point features to vector points:When you convert a raster representing point features to vector point, a point will be created in the output vector point layer for each cell with a value in the input raster. Each point will be positioned at the center of the cell that it represents. NoData cells will not be transformed into vector points. To examine the effect of vectorization of rasters, we will use our output rasters from Section 2. 3.1 Raster to polygon features Turn off the display of all layers in the TOC...you can do this quickly with a right-click on the data frame, then "Turn All Layers Off". In ArcToolbox, go to the Conversion Tools, then From Raster, select the Raster to Polygon tool. For the input raster, select your vegmap_raster_10 raster layer. Use VEG_TYPE as the field. Be sure to save your output polygon feature class to the Lab5_Pepperwood geodatabase,and give it a logical name, like "vegmap_raster_10_to_polygon". There is an option in the tool to "Simplify polygons". This will smooth the boundaries of the output polygons, reducing their "stair-stepped" appearance resulting from the raster cells. Uncheck the "Simplify polygons" box--we will not use this feature for now. Click OK to run the tool. Repeat these steps for the vegmap_raster_50 raster layer. Compare the area of each land-cover type as represented in the original vegmap_polygon_joinfeature class and the polygon feature classes vectorized from the 10-m and 50-m rasters by completing the table below for Question 6. To summarize the areas of the four cover types in each layer, open the attribute table for each polygon feature class, then select the VEG_TYPE field and right-click and select Summarize. Use VEG_TYPE as the field to summarize, and then check the Sum of Shape_Area for the summary statistic.
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Geography 387 –Fall 2011 Lab 5 Data Model Transformations 12 Save your output tables as Text Files with a .csv extension outside of the geodatabase so that you could open them in Excel (like we did in Lab 2). Give the output tables names that identify the source layer (e.g. raster10_poly_area.csv). For the vectorized feature classes, your Summarize window will look like this: For the original vector layer, use the vegmap_polygonfeature class with the joined table. Your Summarize window will look like this: