I'll try to analyze your use cases from a QGIS perspective:
Software that allows me to drive a specific route and store that as a working model.
There is a GPS Tool for live tracking of GPS devices. But I guess you could go with the simpler version of loading the recorded GPX files into QGIS after collection.
Download some GPS/County information to automagically set elevations, etc.
In the US, you have 1 degree (~ 30 m) SRTM data (height model) available. I'm sure there are other sources which I'm not aware of.
You can also use any WMS or WFS for your region.
Allow multiple people to use the software and share information
As long as you're not looking for a multi-user-level/permission solution, QGIS - especially together with PostGIS - can do that really well. There are solutions to keep data synchronized even if multiple people manipulate the same data at the same time.
Look at historical data over time (e.g. locations of potholes, bad ice, washboarding in a certain year or month - and view that as a report) - or some other means of collecting and storing data sets and keeping them distinct in time.
As mentioned before. I'd recommend PostGIS as a data store. For analysis of historical data, you might want to look into Time Manager plugin. But of course some simple filters (on time attributes) could work just as well for you.
Using Print Composer, you can create quite nice reports. Of course, developing the first report will take some trial and error but once your satisfied, you can save it as a template and reuse it easily.
You may consider GRASS GIS which offers a rather complete processing chain for Landsat including radiance correction for Landsat 8. For details, see
http://grasswiki.osgeo.org/wiki/LANDSAT
Examples:
- Landsat 1-5,7,8 data import
- Auto-enhance colors, natural color composites
- Calculate Top-of-Atmosphere Reflectance and band-6 Temperature
- Haze removal
- Atmospheric correction
- Cloud identification
- image classification
- time series analysis
- Export of results
Best Answer
IRIS is one existing open-source solution you should probably be aware of:
From Wikipedia:
See its administrator guide for implementation/architecture details.