I don’t want to leave this data in WGS84 for this map so I am going to reproject the map into something more appropriate using the MAP View Editor.This will import the cropped data in WGS84. You will also need to press OK to confirm the settings on the previous two dialogue windows. I do not need to be overly concerned about the accuracy of my crop, as long as my area of interest is included. In this case, I will be centering over New York. Maneuver the markers to specify the extents. You can optionally set the bounds using the latitude and longitude of two points. I will then use the small Earth icon in the top left to specify the bounds of the spatial filter. I will be setting the Relationship to Crop using the dropdown box. Click on the box to the left to enable the spatial filter and then click on the icon to set the parameters. This will display the lower window called “Filtering Options”. To do this, click the “Use default filtering options” link next to filtering in the Import Dialogue window. For this reason, I am going to use a spatial filter to crop my data down to my area of interest and save my computer from having to import a county-level shapefile of the entire US. The dataset that I am importing is for the whole Unites States and for this map I will only be focusing on a small portion of New York State.If I were to assign a different coordinate system here, the data would still be in WGS84 and not what is assigned here. I am selecting WGS84 because I know that this data is in WGS84.
It is very important to note that by assigning a coordinate system at this stage, I am not reprojecting or transforming the data in any way. By clicking on the “No Coordinate System Specified” link, I am able to assign one. Notice that there is not currently a coordinate system associated with the data. I begin by importing a shapefile of the County level boundaries of the United States.This article aims to run through a workflow of assigning a coordinate system to data that has one specified, transforming the projected coordinate system to something more appropriate for our end map product, and then projecting any supplementary data into the chosen projection on the fly.
0 kommentar(er)
