3D Modeling and Landscape Visualization

Under Construction

Land & Mapping Services can create custom imagery for your project. Our GIS team can create and display 3-Dimensional perspective images for a wide variety of data types as well as dynamic 3-D displays.

This should look familiar to many visitors. It is a USGS quad sheet. Specifically, this image is a JPEG made from converting and reducing a USGS produced DRG (Digital Raster Graphic) which are scanned copy of a quad sheets distributed as TIFF files.

This image is a JPEG converted from a DOQ (Digital Ortho Quad) distributed as a Mr.SID Image on the PASDA site. These images were previously distributed in BIL format as Quarter Quads (DOQQ). The conversion to Mr.SID format allows huge savings in file size.

These lines represent a road network. The roads have been symbolized with different color and width lines. The thick red lines are interstate highways, the grey lines are side roads.

Contour Lines colored to show elevation.

Contour lines represent points of equal elevation. Moving from one line to the next one represents an increase or decrease of one "contour interval" of vertical distance. Contour interval on USGS quad sheets is commonly 20 feet, though in flatter areas the interval may be 10 feet and in rougher terrain, the interval may be 40 feet. The shorter the horizontal distance between contours (the closer they are together) the steeper the slope. Here the contour lines have been color coded to more easily show the elevations. Brown lines are higher elevations. Green lines are the lower elevations.

Digital Elevation Model color coded by elevation.

This image is a screen shot of a color coded DEM (Digital Elevation Model) distributed on the PASDA site. A DEM is a grid of elevation values. GIS software can read these files to produce a model of the earth's surface for the extent of the DEM. This image was created in ArcView by first converting the USGS produced DEM to an ESRI GRID and then classifying the cells by their elevation value.

DOQ draped over a surface derived from a DEM.

This image is a screen shot of DEM with a DOQ draped over it.

Digital Elevation Model with hill shading applied.

This image is a screen shot of DEM which has been 'hillshaded'. The DEM is displayed in a grey scale which shows the light intensity and shadows from the sun at a particular azimuth and elevation.

Digital Elevation Model classified by elevation and hill shading applied.

This image is a created by combining two of the above visualization techniques. The color classification by elevation has been made slightly transparent and then draped over the hillshading of the DEM.

Take an imaginary helicopter ride over this topography.

1.14MB MPEG file An MPEG animation constructed with the above data.

1.13MB ZIP file MPEG animation archived in ZIP format.

View contours for this topography in Virtual Reality.

Requires a VRML plug-in for your browser

1.5 MB WRL file A VRML 2.0 world with 50 foot contours of the above data.

333 KB ZIP file A VRML 2.0 world with 50 foot contours archived in ZIP format.


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