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When the Import Data Source HOMERS29 box appears, click Yes to add the new theme to the view.

Be patient while ArcView GIS calculates the new grid. Allow the file to be placed in the Temp directory and click OK.

The Output Grid box appears with the default grid name imgrd1 (if this is the first output grid generated in this session).

m should appear in the list of Import USGS DEM files.

Select USGS DEM as the file type and click on OK. If Import Data Source is not available from the File menu, load the ArcView Spatial Analyst extension.

Choose Import Data Source from the File menu.

Start ArcView GIS, load ArcView Spatial Analyst, create a new project, and open a view.

The downloaded and prepared data can now be used for two-dimensional modeling. To run IMPORT71, double click the IMPORT71 program item in the ArcView GIS program group to display the dialog box. If it is not in the program group, it should be found with the ArcView GIS programs in the bin32 subdirectory. IMPORT71 appears as a program item in the ArcView GIS program group. IMPORT71 is a stand-alone program that converts an ArcInfo interchange file created on any other operating system into an ArcInfo Version 7.x coverage or grid. Use the IMPORT71 utility that comes with ArcView GIS to format the file so it can be used.

Unzip, the hydrography coverage, and rename it s29hya.e00.

The decompressed file should be 9,225 KB. Because 29elu.Z is a UNIX-compressed file, use the WinZip decompression utility with the Classic option to extract the file. This folder should now contain both downloaded files.

After closing the browser, go to My Computer and open the DEMWORK folder.

is the hydrography file associated with this quad. 29elu.Z is a UNIX-compressed USGS ASCII file that is 2,443 KB.

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Select and download 29elu.Z and to the DEMWORK folder. This brings up a page showing the zipped USGS DEM files for this quad.Use the map's reference grid to locate and click on quad S 29 (Homer), the northwest quad in Cortland County. Visit the Cornell University's Geospatial Information Repository (CUGIR)to download project data files.Create a new folder named DEMWORK to hold downloaded data files.Locating and downloading the sample data set is the first step in this project. On converting and importing DEM files is available from theĪrcView GIS OnLine Discussion Forum at the Esri Web site.

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How to prepare DEM data downloaded from the USGS Web site using a free utility. "Converting and Using SDTS Digital Elevation Model Data," describes Another article in this issue of ArcUser magazine, This project uses a DEM file downloaded from a source that provides converted 7.5' DEM coverages Ordering DEM data sets can be obtained at the USGS Web site. Details regarding available coverages and procedures for DEM dataĪt this scale is particularly useful because each data set provides the same large-scale coverage as a Terrain models constructedįrom elevation data can be used for a variety of purposes including line-of-sight forecasting, slopeĪnd aspect determination, surface runoff pattern analysis, and drainage basin delineation. USGS 7.5' DEM, a raster data set containing elevation information, has 10 x 10 meter data spacing.Īfter converting the data, it can be easily imported into ArcView GIS. Visit the Terrain Modeling with ArcView GIS for additional resources for modeling with ArcView GIS. Large model, working with a smaller model while learning these techniques might be a good idea. Even if the computer used for modeling is sufficiently robust to render a

#Digital terrain model provides input data to tin how to

"Making Data More Manageable." This article explains how to create a custom theme thatĬan speed navigation and improve refresh rates. Steps for reducing the size of the area modeled by clipping the contour line theme are described in the accompanying article, He gives additional instructions on how to produceĪ three-dimensional model by draping and modeling two-dimensional With the contour line theme, a triangulated irregular network (TIN) model can be built.

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Pentium-class PC with 64 MB RAM suggested.Ĭompute an attractive hillshaded map, and create a contour line theme. Using ArcView Spatial Analyst, the author tells how to output a grid theme that can be used to Perform two-dimensional and three-dimensional modeling in ArcView GIS with the ArcView Spatial Analyst and ArcView Editor's Note: This article describes how to use sample 1:24,000-scale 7.5' digital elevation model (DEM) data files to