ArcScan makes it easy to create new features from scanned raster images. This process can significantly reduce the time it takes you to incorporate raster data into your vector database. In this exercise, you will generate features from a scanned parcel map by interactively tracing raster cells. You will begin by starting ArcMap and loading a map document that contains the raster dataset and two layers. ArcScan is designed to work in conjunction with the ArcMap editing environment and is only active when an edit session has been started. You need to set some options for snapping while editing and using ArcScan.
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Chelsea Scheske. Valentin Lucet. Tool-Crossed by the outline of. ArcScan Tutorial. We also imported the data for this tutorial by creating a new folder connection and adding the data in the Table of Contents. In order to use the ArcScan tools and commands, we have symbolize raster layers as two-color images.
Therefore, we changed the raster symbology from stretched to unique values for the "ParcelScan. Figure 1. Changing the symbology of the raster layer by selecting unique values,Figure 2.
Vectorization Trace Tool and new line feature. Vectorization Trace Tool and new polygon feature on lot This exercise shows how a user can interactively trace raster cells in order to generate new features from a scanned parcel map.
Figure 2. Figure 3. Creating line features by tracing raster cells. Figure 4. We zoomed in a different part of the image and selected ParcelPolygons in the Create Features window. We continued to trace around the lot boundary in a counterclockwise direction. Pressing F2 completes the polygon. Setting up the ArcScan environment. Preparing the raster for vectorization: Raster painting.
We opened the Editor menu and selected "Start Editing". Preparing the raster for vectorization: Cell selection. Specifying the vectorization settings. ArcScan allows users to create features from scanned images. This specific tutorial will demonstrate how to generate vector data from raster images, as well as provide an introduction to cell selection and raster snapping.
It also shows how to do both automatic and interactive vectorization. Exercise 1: Interactive vectorization This exercise shows how a user can interactively trace raster cells in order to generate new features from a scanned parcel map. Changing the symbology of the raster layer by selecting unique values, Figure 2.
Setting up the raster snapping environment In order to use ArcScan, we have to set some options for snapping. First, the Editor toolbar has to be added to the workspace. In the Editor menu, we clicked options and the General tab. We checked the "Use classic snapping", which disables the Snapping toolbar's snapping environment for use in editing. We then clicked Start Editing in the Editor toolbar.
In the ArcScan toolbar we clicked the Raster Snapping Options button in order to open the Raster Snapping dialog box, and set the maximum line width to 7.
This ensures that we are able to snap to raster cells that represent lot boundaries. We then selected Centerlines and Intersection in the Snapping Window. Finally, we set show SnapTips in the Options of the Snapping window, this activates pop-up window messages that show information on the type of snapping as we move the pointer around the map.
Creating line features by tracing raster cells We will use the Vectorization Trace tool for this step. We then clicked the ParcelLines line feature template in the Create features, and the Vectorization Trace tool. We moved the pointer until it snapped to the intersection of the lot boundaries and started tracing. We pointed the this tool downward and clicked to start creating the first line, this was continued around the exterior boundary of the lots.
Creating polygon features by tracing raster cells We zoomed in a different part of the image and selected ParcelPolygons in the Create Features window. Exercise 2: Automatic vectorization This exercise will first allow us to edit a scanned parcel map to remove cells from the raster that are not in the scope of the vectorization. It also demonstrate how to use the batch vectorization mode in order to generate features. We changed the symbology from stretched to unique values of the "ParcelScan.
Similar to the previous exercise. Preparing the raster for vectorization: Raster painting We opened the Editor menu and selected "Start Editing".
How To Vectorize Image Files Automatically with ArcScan
Each one of these GIS software applications can lend you a helping hand and do all the work for you. At least most of it. Admittedly, this will come with a bit of trial and error. For example, here are the contour lines we want to vectorize that is already scanned from a paper copy:. The result is an image with only zero and one values binary raster.
Exercise 1: Interactive vectorization
From Tools Menu, choose Extensions. From View Menu, choose Toolbars , check Editor. Change Symbology to Classified 0 and 1, BW. This is typically set to Black or some other color of choice and White or Clear. Add your Line whatever your line file is named, referred to here as Line shapefile or create a new one if need be. On the Editor toolbar main dropdown list, choose Start Editing.