lab2

lab2 - ESPM 72 Introduction to Geographical Information...

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ESPM 72 Introduction to Geographical Information Systems Thursday February 14th Lab 2 Due: Thursday, February 28th Lab Objectives 1) To get familiar with ArcMap and ArcCatalog and learn how to import the ArcInfo interchange .e00 file to shapefiles. 2) To learn how to edit the geographic information in ArcMap, especially by forcing topology constrains. 3) To learn how to assemble data from different coordinate systems and show them in a consistent way. Description 1. For this part you will learn how to convert the ArcInfo interchange format (.e00) to shapefiles and how to edit shapefiles. 1) Download the data First, make sure you have your own folder and create a directory like yourFolder\lab2\. Download the file (polycov.e00) from the course webpage to your directory. Just a little background about .e00 files: the .e00 file is widespread in the era of ArcInfo, the predecessor of ArcGIS. In ArcInfo, the data are organized as coverages . To exchange files with other software like Mapinfo, AutoCAD, and Erdas Imagines, ESRI developed an interchange file format .e00 and published the details of the way how the data are organized. If you open the .e00 with a text editor such as notepad, you will find out that the data are actually stored in ASCII format, nothing different from a text file (find out what ASCII stands for by searching the internet). The .e00 file is a little bit out-of-dated since most software such as PCI Geomatics nowadays can directly read the shapefiles. However, many people still use .e00 files for data distributing (since all the coverage files will be store into one file). Unfortunately, you cannot directly convert the .e00 files into shapefiles. What you can do is only to import the .e00 files into coverages. Then, you can convert the coverage into other format you want (e.g., shapefiles, geodatabase) 2) Import an .e00 file to a coverage Start ArcCatalog or ArcMap, click the ArcToolbox icon , Expand the Coverage Tools by clicking the plus sign before it. Click To Coverage . Choose Import From Interchange File. When the dialog pops up, choose the input file as the .e00 file you
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just downloaded and name your output dataset. For convenience, you can set the output directory be the same as the one for polycov.e00. Click OK. Now, open Windows Explorer (use the Windows Key + E), navigate to yourFolder\lab2\. Remember, we have one file polycov.e00 before. Now there are two folders which were just created. What are they? What are these TWO folders for separately? Go back to ArcCatalog, and navigate to your directory on the left panel. On the right panel, make sure that Contents tab is clicked . Why is there only one folder? Enter that folder. How many files are there? Go back to Windows Explorer and enter the same folder. You will find out that there are much more files there. Come up with some reasons why there are much few files in ArcCatalog than those actually existing in the hard
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lab2 - ESPM 72 Introduction to Geographical Information...

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