This is a highly capapble GIS system which is file-compatible with ArcInfo, ArcView, etc. You can do 3-d maps, rotate them, overlay a tax map on them, shade your subject tract, view it in 3-D from altitude. It's name is GRASS, which is a government acronym for Geographic Resources Analysis Support System. There are free versions for Mac, Linux, and WinTel machines.
There are free maps available from USGS for most areas of the country. (Except mine. TVA controls the maps for Tennessee, and they charge $100 for a bunch of quadrangle charts on CD.) The map data which you can plot (including D-FIRMs, which are available from FEMA on CD; census data from census.gov) is extensive. Much of it is free, but a lot of satellite data has to be bought, if you need it.
Fair warning: There are over 300 separate programs in this package, and each does something different. The learning curve goes straight up, and it's greased. The potential uses for appraisal purposes is limited only by your capacity to learn a complex and versatile mapping system. You'll spend a lot of time learning how to do stuff.
Here's the link: http://grass.baylor.edu//index.html
For Mac users, try the Aqua version for OS X from http://www.openosx.org. They also have a textbook entitled "Open Source GIS: A Grass GIS Approach" which is an excellent tutorial on how to use the program for most anything. Kinda pricey at $125, but the payoff can be big. These guys have got a CD with all the support programs you need to run this on a Mac under OSX. The CD is $60, and you'll want the book too. The CD is great. Just plug it in, hit the installer, and you're ready to rock.
On the Baylor link, you'll find other links to several tutorials.
Enjoy
Jim
There are free maps available from USGS for most areas of the country. (Except mine. TVA controls the maps for Tennessee, and they charge $100 for a bunch of quadrangle charts on CD.) The map data which you can plot (including D-FIRMs, which are available from FEMA on CD; census data from census.gov) is extensive. Much of it is free, but a lot of satellite data has to be bought, if you need it.
Fair warning: There are over 300 separate programs in this package, and each does something different. The learning curve goes straight up, and it's greased. The potential uses for appraisal purposes is limited only by your capacity to learn a complex and versatile mapping system. You'll spend a lot of time learning how to do stuff.
Here's the link: http://grass.baylor.edu//index.html
For Mac users, try the Aqua version for OS X from http://www.openosx.org. They also have a textbook entitled "Open Source GIS: A Grass GIS Approach" which is an excellent tutorial on how to use the program for most anything. Kinda pricey at $125, but the payoff can be big. These guys have got a CD with all the support programs you need to run this on a Mac under OSX. The CD is $60, and you'll want the book too. The CD is great. Just plug it in, hit the installer, and you're ready to rock.
On the Baylor link, you'll find other links to several tutorials.
Enjoy
Jim