Latest Headlines

ISTAR and VARGIS Deliver Countywide TrueOrtho to Howard County, Md. 09.23.2002

TrueOrtho imagery helps eliminate expensive stereo compilation for planimetric mapping.

ISTAR Americas and VARGIS LLC have teamed to deliver a one-foot, natural color TrueOrtho mosaic for the entire area of Howard County, Maryland. The fast-growing county is relying on the ISTAR TrueOrtho image mosaic to “heads-up digitize” new planimetric updates into their GIS as a cost-effective alternative to expensive stereo compilation. Howard County is a mixture of expanding suburbs and rural farmland along the Interstate 95 corridor between Baltimore and Washington, D.C.

Working as a VARGIS contractor, ISTAR Americas acquired the 1-foot resolution digital aerial data in late February 2002 and delivered a countywide TrueOrtho image to VARGIS within 90 days. This geometrically accurate mosaic was then color-enhanced in subsequent weeks to match past imagery, and integrated to the county’s GIS operation. Typically, the county obtains new stereo photography every four years to update its map base through traditional stereo compilation, but this year it chose ISTAR as a faster and more cost-effective way to update their planimetric landbase.

Howard County is one of several large-area mapping projects in which ISTAR Americas has used the HRSC-AX airborne camera developed by DLR, the German Space Agency. This digital camera acquires imagery at 25cm (~10in) pixel resolution from an altitude of 20,000 feet, allowing it to cover huge tracts of land in a single swath. In addition to 24-bit natural color and infrared imagery, the ISTAR cameras also produce 16-bit panchromatic imagery and perfectly correlated, high-resolution 3D surface models.

TrueOrtho image mosaics are ISTAR Americas’ signature data set, although the company also produces one-meter resolution 3D surface models. TrueOrtho data are derived from multiple swaths of digital HRSC-AX image data, and orthorectified using an automated pixel-by-pixel stereo production system. The result is a TrueOrtho image in which all surface features are visible – even alleys, streets and the sidewalks between tall buildings – and a realistic 3D model that’s an exact match to the image data.

Did you enjoy this article? Click here to subscribe to POB.

You must login or register in order to post a comment.



Image Galleries

HxGN Live

More than 3,500 attendees from more than 70 countries attended HxGN Live, the annual Hexagon AB user conference, at the MGM Grand Hotel & Casino in Las Vegas on June 3-6. About 450 keynotes and panel discussions were held, and several companies from around the world exhibited their geospatial products. Here are a few snapshots from the event.


POB April 2015 Cover

2015 April

In this April 2015 issue of POB, we explore how AVEVA solutions and laser scanning gave international contractor Ariosh some real competitive advantages in challenging oil and gas revamp projects.

Table Of Contents Subscribe


Surveyors, with the weather finally starting to improve everywhere, are you thinking about the long days to come? This summer, you are going to …
View Results Poll Archive

Point of Beginning Store

M:\General Shared\__AEC Store Katie Z\AEC Store\Images\POB\epubsite\Statues-pic-large.gif

The perfect gift or award for any special occasion.

More Products

Clear Seas Research

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


Facebook logo Twitter logo  LinkedIn logo  YouTube logoRPLS small logo

Google +

Geo Locator

Buyers Guide

The #1 buyers' guide for land surveyors and geomatics professionals. Search listings for software and equipment manufacturers, equipment dealers and professional services. CLICK HERE to view GeoLocator.