X-Mailer: ELM [version 2.2 PL16]
Newsgroups: comp.infosystems.gis
Date:         Tue, 18 Aug 1992 16:41:10 EST
              <GIS-L@UBVM.BITNET>
From:         Robert Driessen <driessen@SOL.SURV.UTAS.EDU.AU>
Subject:      Direct single photo digitising
X-To:         gis-l@ubvm.cc.buffalo.edu

                          ADVERTISMENT
			  ============

Direct Digitizing from Single Aerial Photographs into ARC/INFO.

Free Demo Disk for ARC/INFO on unix to anyone who sends name and address and
platform info to R.J.Driessen@censis.utas.edu.au.
(Sorry, will not send demo for commercially available product over network)


"PhotoGIS enables cost-effective data capture direct from aerial photographs"

With PhotoGIS you can avoid expensive stereo plotters and operators by
using an innovative software technique. Now your data can be interpreted from a
photograph and immediately entered into a Geographic Information System or
digital mapping system in your own office.


"Only single photographs are required"

PhotoGIS corrects data captured from a single photograph for any amount of
camera tilt and for scale differences due to variations in terrain elevation.
PhotoGIS also transforms the photographic data to the coordinate system of your
map data base. These corrections rely on a digital elevation model (DEM), which
roughly defines the shape of the ground surface underlying the photography, and
four points whose geographic coordinates are known. For many applications,
control can be measured from a suitable map. Digital elevation models are now
available for most of the United States, Australia and many other countries.


"Use a conventional digitiser"

You capture data directly from a vertical or oblique photograph using a
digitiser. Then you can use PhotoGIS to rigorously correct the digitised data
for photographic distortions.


"Data collection, revision and updates"

You can use PhotoGIS for conventional map-making tasks when the use of
traditional equipment would be too time-consuming, inconvenient or expensive.
The software is particularly useful for updating and revising planimetric maps,
when minor changes can be readily detected from the photograph and applied
immediately to the data base.


"Save time and money"

Any photographic data capture that was difficult in the past because of time and
expense can now be performed quickly and economically with PhotoGIS, in your own
office.


Who can use PhotoGIS?

PhotoGIS can be used by anyone who collects data from aerial photographs:
  - foresters and botanists collecting and revising vegetation boundaries
  - soil assessors needing  to interpret and map soil boundaries
  - environmentalists wishing to accurately monitor variations in land use or
    pollution
  - land capability mappers who need to interpret and collect data from aerial
    photographs
  - farmers wishing to calculate areas of crop plantings, land reclamation or
    weed infestation
  - geographers interpreting and monitoring physical geographic changes
  - cartographers updating existing mapping, including urban street directories
    and topographic maps
  - nature park managers measuring the impact of park visitors, mapping trails
    and planning annual works programs
  - archeologists wishing to collect data from infra-red photographs of
    historic sites.

What you need to run PhotoGIS Version 1
  - a digital elevation model
  - aerial photographs from metric cameras
  - suitable control points
  - ARC/INFO software*
  - A Sun or IBM workstation or IBM-compatible PC.

Compatibility
Workstation PhotoGIS is fully compatible with ARC/INFO version 6.  PC PhotoGIS
is compatible with PC ARC/INFO, yet will operate independently.

What PhotoGIS will do
  - correct data for camera tilt
  - correct data for relief displacement
  - transform data to map grid.

For more information
====================
If you would like more information please contact your local ESRI distributor or
Salamanca Software Pty Ltd and let us know your name, address, and the equipment
and GIS software you use.

           Salamanca Software Pty Ltd,
           PO Box 844,
           Sandy Bay,
           Tasmania 7005.
           Telephone (002) 278614, (int +61 02 278614),
           fax (002) 279301, (int +61 02 279301)

           Email: R.J.Driessen@censis.utas.edu.au

Also refer to the paper titled "From Aerial Photographs to ARC/INFO" by Driessen
and Zwart in the ESRI 92 User Conference Proceedings


===============================================================================
  Robert J Driessen                          R.J.Driessen@censis.utas.edu.au
  Centre For Spatial Information Studies     Phone: 002 202106  (National)
  University of Tasmania                            61 02202106 (International)
  GPO Box 252C                               Fax:   002 240282  (National)
  Hobart                                            61 02240282 (International)
  Australia 7001
===============================================================================

*ARC/INFO is a Registered Trademark of the Environmental Systems Research
Institute Inc.