Below is a list of websites with data, software, APIs, and opportunities for data collection that you may wish to explore. The list is not exhaustive.

Thematic maps, OrthoQuads, Digital Elevation Model (DEM) & LiDAR Data

AGIC - Arizona Geographic Information Council

Pima County GIS - FTP Server, Data viewer

University of Arizona Library + Spatial Data Portal Viewer

OpenTopography - DEM and LiDAR Data

National Elevation Dataset (NED) USGS -  Maps, GIS, Apps, Data

OpenGrid - Developed by the City of Chicago, the future of data sharing and mapping 

OpenStreetMap - Open roads and feature map similar to Google Maps

Satellite Products

Moderate Resolution Imaging Spectroradiometer (MODIS)

MODIS Active fire & Burned area products

NASA Global 3D mapping

Landsat Data - long term series of global data

Weather, Earth Science Data 

Critical Zone Observatories - local observations from CZO sites.

DAYMET Weather - NASA Daymet gridded (1km) climate data.

PRISM Climate - Bi-weekly gridded (800m, 4km) climate data.

NOAA Gridded Climate - Dozens of climate data archives

NOAA Reanalysis data - Climate data that has been normalized for consistent climate model runs.

FluxNet - Eddy Covariance Flux Tower observations.

NEON - National Ecological Observation Network

Cyber Infrastructures

Google Earth Engine - Google's cloud API for public satellite data 

CyVerse - UA sponsored cyber-infrastructure

XSEDE - NSF Sponsored cyber-infrastructure networks

Blogs

Lidar News

Lidar Magazine

Operators - Collection Services

National Center of Airborne Laser Mapping (NCALM) - seed proposals for undergraduate/graduate projects!